This standard specifies the definition, type, parameters, basic performance and test requirements of semiconductor power converters. This standard applies to power electronic converters and power electronic switches composed of electronic valves. In terms of operation mode, it is mainly based on rectifiers, inverters, or converters with both of these two operations based on grid phase commutation. GB/T 3859.1-1993 Basic requirements for semiconductor converters GB/T3859.1-1993 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Semiconductor converters
Specification of basic requirements
Semiconductor convertors
--Specification of basic requirementsGB/T3859.1-93
Replaces GB3859--83
This standard is equivalent to IEC146-1-1 (1991) "Semiconductor converters: General requirements and grid-commutated converters, Part 1, Specification of basic requirements".
1 Subject content and scope of application
1.1 Subject content
This standard specifies the relevant definitions, types, parameters, basic performance and test requirements of semiconductor power converters. 1.2 Scope of application
This standard applies to power electronic converters and power electronic switches composed of electronic valves. In terms of operation mode, it is mainly based on rectifiers, inverters, or converters with both operations based on grid commutation. The electronic valves mentioned here mainly refer to circuit valves composed of power semiconductor devices (such as diodes, various types of thyristors and power transistors, etc.). These devices can generally be controlled by electrical or optical signals and work in a switching state. As long as there is no contradiction, this standard can also be used as a standard for other types of power electronic converters (such as self-commutated converters, DC-DC converters, converters for motor drives, converters for electric railways, etc.). In general, these types of converters should also formulate their own classification product standards based on this standard. www.bzxz.net
2 Reference standards
GB/T2900.32 Electrical terminology Power semiconductor devices Electrical terminology Power electronics technology
GB/T2900.33
GB/T3886 Thyristor power converter for DC motor speed regulation GB/T3859.2 Application guide for semiconductor converters GB/T3589.3 Semiconductor converters Transformers and reactors JB4276 Technical conditions for power converter packaging GB/T13384 General technical conditions for electromechanical product packaging GB10236 Mutual interference between semiconductor converters and power grids and their protection methods Guidelines GB/T242 3
GB/T3768
Basic environmental test procedures for electric and electronic products-Simplified method for determination of sound power level of noise source
Transformer oil
GB2536
JB1505 Semiconductor power converter
3 Terms and symbols
3.1 Terms
Model compilation method
Approved by the State Bureau of Technical Supervision on December 27, 1993 and implemented on September 1, 1994
GB/T3859.1-93
Only the terms and their definitions used or mainly in this standard are given here. For other terms and definitions related to power electronics technology, please refer to GB2900.32, GB2900.33 and GB/T3859.2. 3.1.1 General terms
semiconductor device
3.1.1.1 Semiconductor body
A device whose basic characteristics are determined by the flow of carriers in the semiconductor. 3.1.1.2 Power semiconductor diode powersemiconductordiode A two-terminal semiconductor device with asymmetric voltage/current characteristics used in power converters. 3.1.1.3 Thyristor thyristor
A bistable semiconductor device that includes three or more junctions and can be switched from the off state to the on state. Note: "Thyristor" is a general term for all PNPN type devices. When it does not cause confusion or misunderstanding, it can be used to refer to any device in the thyristor family, especially widely used to refer to reverse blocking triode thyristors. 3.1.1.4 Reverse blocking triode thyristor reverse blocking triode thyristor A three-terminal thyristor that cannot conduct under negative anode voltage and exhibits reverse blocking characteristics. 3.1.1.5 Reverse conducting triode thyristor reverse conducting triode thyristor A three-terminal thyristor that does not block under negative anode voltage and can conduct a large reverse current under a voltage equivalent to the forward on-state voltage. 3.1.1.6 Bidirectional triode thyristor A three-terminal thyristor with basically the same switching characteristics in the first and third quadrants. 3.1.1.7 Turn-off thyristor (GTO = Gate Turn Off) A thyristor that can be switched from the on state to the off state, or from the off state to the on state, by applying a control signal of appropriate polarity to the gate terminal. 3.1.1.8 Power transistor power transistor A junction transistor used to control power.
3.1.1.9 (Valve device) stack A single structure composed of one or more valve devices together with their related mounting parts. 3.1.1.10 (Valve device) assembly A general assembly composed of valve devices or stacks in electrical and mechanical combination, including electrical connections and auxiliary parts inside the mechanical structure. 3.1.1.11 Converter assembly A general assembly composed of valve devices or stacks in electrical and mechanical combination, mainly used for current conversion, including electrical connections and auxiliary parts inside the mechanical structure.
2 Converter equipment converter equipment
Equipment mainly used for current conversion operation, composed of one or more converters together with converter transformers, filters (if necessary), switch devices and other auxiliary equipment (if any). For example, equipment used for rectification, inversion, frequency conversion, and chopping. Note: Similar terms also apply to specific types of converters, such as rectifiers, inverters 3.1.1.13 (Electronic) (Power) Converter A generic term for converters and converters. It is usually referred to as converters. Note: When it is necessary to clearly distinguish between converters and converters to avoid confusion, the term converter is still used. onequadrantconvertor
3.1.1.14 Single-quadrant converter
A converter connected to a DC system with only one possible voltage polarity and current direction. 3.1.1.15 Two-quadrant (single) converter towquadrant (single) converter A converter connected to a DC system with two possible power flow directions, of which only the voltage or only the current may change direction.
Note: For externally commutated converters, it refers to a single converter in which only the voltage direction may change. 3.1.1.16 Four-quadrant converter (double-quadrant converter) Fourquadrant (double) converter A converter connected to a DC system with two possible directions of power flow, the direction of its DC voltage and DC current can be changed.
GB/T3859.1-93
7 Reversible converter Reversible converter A converter with reversible power flow direction.
3.1.1.18 Single converter A reversible converter connected to a DC system, the DC current of which can only flow in one direction. 3.1.1.19 Double converter A reversible converter connected to a DC system, consisting of two converter groups, each group passing current in one direction. 3.1.1.20 Converter section (of double converter) A part of a double converter, the DC current of which always flows in the same direction from the DC end. 3.1.1.21 Trigger (trigger device) triggerequipment The unit that converts the control signal into an appropriate trigger pulse to control the controllable valve device, including phase shift or timing circuit and pulse generation circuit, and generally also includes a power supply circuit. 3.1.1.22 System control device systemcontrolassembly A device connected to power electronic equipment to automatically adjust its output characteristics (such as a function of motor speed or traction). 3.1.2 Circuit and operation terms 3.1.2.1 (circuit) valve (circuit) valve The part of the circuit bounded by the two main terminals of the valve and having uncontrollable or bistable controllable unidirectional conductive characteristics. 3.1.2.2 (Valve) arm
Bounded by any two main terminals (AC or DC terminals): that part of the circuit that includes one or more valves and their components (if any) that are connected and conduct electricity.
3.1.2.3 Principal arm
The (valve) arm that plays a major role in transferring electrical energy from one side of the converter or electronic switch to the other side. 3.1.2.4 Convertor arm
The main arm in the electronic converter connection.
3.1.2.5 Controllable arm controllable arm An arm with a controllable semiconductor device as a valve device. 3.1.2.6 Non-controllable arm non-controllable arm An arm with a non-controllable semiconductor device as a valve device. 3.1.2.7 Auxiliary arm auxiliary arm
Any other arm other than the principal arm.
3.1.2.8 Bypass arm by-pass arm
An auxiliary arm that provides a conduction path for current during the period when the main arm is not conducting and there is no exchange of electrical energy between its power supply and load. 3.1.2.9 Free-wheeling arm A bypass arm that only contains an uncontrollable valve. 3.1.2.10 Turn-off arm turn-off arm
An auxiliary arm that directly receives current from the conduction arm in a transitional manner. 3.1.2.11 Regenerative arm regenerative arm An auxiliary arm that transfers part of the power from the load side to the power supply side. 3.1.2.12 Convertor connection converter connection The electrical connection method between the arm and other components that play an important role in the main circuit of the converter. 3.1.2.13 Basic converter connection basicconvertor connection The electrical connection method of the main arm in the converter. 3.1.2.14 Single-way connection GB/T3859.1—93
A type of converter connection, in which the current at each phase terminal of the AC circuit is unidirectional. 3.1.2.15 Double-way connection A type of converter connection, in which the current at each phase terminal of the AC circuit is bidirectional. 3.1.2.16 Uniform connection A type of connection in which all main arms are the same, either controllable or uncontrollable. 3.1.2.17 Non-uniform connection A type of connection in which the main arms are both controllable and uncontrollable. 3.1.2.18 Series connection A type of electrical connection, consisting of two or more converter connections, whose DC voltages are superimposed on each other. Note: A series connection consisting of commutation groups that do not commutate simultaneously can also be called a cascade connection. 3.1.2.19 Quadrants of operation (on d.c side) Quadrants of the voltage-current plane defined by the polarity of the d.c voltage and the direction of the current. 3.1.2.20 Commutation
The process of sequential transfer of current from one arm to another, when both arms are conducting simultaneously and the d.c. current is not interrupted (see Figure 1). 3.1.2.21 Direct commutation A self-commutation method without any auxiliary arm transition between the two main arms. 3.1.2.22 Indirect commutation A series of commutations from one main arm to another or back to the original arm with the help of continuous commutation of one or more auxiliary arms.
3.1.2.23 External commutation
external commutation
A commutation method in which the commutation voltage is provided by a power source other than the converter or electronic switch. 3.1.2.24 Line commutation An external commutation method in which the commutation voltage is provided by the grid. 3.1.2.25 Load commutation An external commutation method in which the commutation voltage is provided by the load rather than the grid. 3.1.2.26 Resonant load commutation A load commutation method in which the commutation voltage is provided by the resonant characteristics of the load. 3.1.2.27 Self commutation A commutation method in which the commutation voltage is provided by the internal components of the converter or electronic switch. 3.1.2.28 Directly coupled capacitor commutation A self commutation method in which the commutation voltage is directly provided by the capacitor in the commutation circuit. 3.1.2.29 Inductively coupled capacitor commutation A type of capacitor commutation method in which the capacitor circuit is inductively coupled to the commutation circuit. 3.1.2.30 Device commutation A self commutation method in which the commutation voltage is generated by the device itself. 3.1.2.31 Commutation circuit. Circuit consisting of two commutation arms and a commutation voltage source. 3.1.2.32 Overlap angle uangle of overlap Commutation duration between two main arms, expressed in electrical degrees. It is assumed that only two arms are conducting at the same time (see Figure 2). 3.1.2.33 Commutation notch Periodic voltage transients in the AC grid voltage of a grid-commutated or mechanically commutated converter due to the commutation process. 3.1.2.34 Commutation repetitive transient Voltage oscillations associated with commutation notches.
External extinguishing
Capacitor commutation
Inductive coupling
Capacitor commutation
By device?
Self commutation
By device?
Direct coupling capacitor?
GB/T3859.1—93
Current transfer between arms?
Device off
Device commutation
Direct coupling
Capacitor commutation
External measures?
Direct commutation
Load commutation
Use auxiliary arm?
External commutation
Commutation voltage comes from
Grid?
From machinery?
Resonant load commutation
Figure 1 Commutation mode
Indirect commutation
Grid commutation
Mechanical commutation
3.1.2.35 Commutation group
commutationgroup
A group of main arms that commutate in turn, whose current is directly transferred between the main arms in the group without the participation of other main arms in transition commutation. 3.1.2.36 Commutation number qcommutationnumber The number of commutations from one main arm to another in one cycle of the AC voltage in each commutation group. 3.1.2.37 Quenching
The phenomenon that the current in the arm stops flowing without commutation (see Figure 1). devicequenching
Device quenching
GB/T3859.1-93
A quenching method that relies on the action of the valve device itself to achieve quenching. 3.1.2.39 External quenching externalquenching A quenching method that relies on the action outside the valve device to achieve quenching. 3.1.2.40 Extinction angle extinctionangle The time between the moment when the arm current drops to zero and the moment when the arm is required to start to bear the off-state voltage, expressed in electrical degrees (see Figure 2). 3.1.2.41 Pulse number ppulsenumber
The number of direct or indirect commutations or quenchings from one main arm to another symmetrically that do not occur at the same time within a basic cycle.
3.1.2.42 Trigger delay angle αtriggerdelayangle The time interval that the triggering moment lags behind the reference point, expressed in electrical degrees (see Figure 2). For grid commutation, mechanical commutation and load commutation converters, the rising zero crossing point of the commutation voltage is used as the reference point. 3.1.2.43 Trigger advance angle βtriggeradvanceangle The time interval that the triggering moment leads the reference point, expressed in electrical degrees (see Figure 2). For grid commutation, mechanical commutation, and load commutation converters, the zero-crossing point of the commutation voltage is used as the reference point. Eu u. u C
Description of angles in Figure 2
GB/T3859.1-93
3.1.2.44 Inherent delay angle α, inherentdelayangle The delay angle that will appear in certain circuits (such as 12-pulse connection) under certain operating conditions even without phase control. 3.1.2.45 Margin angle (commutation marginangle) In a grid, machine or load commutation inverter, the time interval between the moment of commutation termination and the point where the commutation voltage drops through zero, expressed in electrical degrees (see Figure 2).
3.1.2.46 Equilibrium temperature equilibriumtemperature The stable temperature reached by the converter components under specified load and cooling conditions. Note: The stable temperatures of different components are generally different, and the time required to establish thermal stability is also different, and is proportional to the thermal time constant. 3.1.2.47 Cooling medium coolingmedium The liquid (such as water) or gas (such as air) that removes heat from equipment or heat exchangers. 3.1.2.48 Heat transfer agent heat transfer agent is a liquid (such as water) or gas (such as air) that transfers heat from the heat source to the heat exchanger in the equipment. The heat is then taken away from the heat exchanger by the cooling medium.
3.1.2.49 Direct cooling direct cooling a cooling method in which the cooling medium is in direct contact with the cooling component without using any heat transfer medium. 3.1.2.50 Indirect cooling indirect cooling a cooling method in which the heat of the cooling component is transferred to the cooling medium with the help of a heat transfer medium. 3.1.2.51 Natural circulation (convection) cooling natural circulation (convection) cooling a cooling method in which the mass (density) per unit volume changes with temperature to cause the cooling fluid (cooling medium or heat transfer medium) to circulate.
3.1.2.52 Forced circulation (forced cooling) forced circulation (forced cooling) a cooling method in which a compressor, fan or pump is used to circulate the cooling medium or heat transfer medium. 3.1.2.53 Mixed circulation (cooling) A cooling method that alternately uses natural and forced circulation to circulate the cooling medium or heat transfer medium. 3.1.2.54 Ambient temperature ambient air temperature Ambient temperature refers to the temperature measured at the middle position of the distance from any adjacent equipment, but no more than 300mm away from the cabinet, and its height corresponds to half the height of the equipment. Direct heat radiation from the equipment should be avoided during measurement. 3.1.2.55 Cooling medium temperature for air and gas cooling The temperature of the cooling medium measured outside the equipment at 50mm from the inlet. Note: In order to estimate the amount of radiated heat, the ambient temperature is the temperature defined in 3.1.2.54. 3.1.2.56 Cooling medium temperature for liquid cooling cooling medium temperature for liquid cooling The temperature of the cooling medium in the duct measured 100mm in front of the liquid inlet. 3.1.2.57 Temperature of heat transfer agent The temperature of the heat transfer agent measured at the position specified by the supplier. 3.1.3 Terms of rated values, characteristics and parameters 3.1.3.1 Rated value ratedvalue
Electrical parameters and thermal, mechanical and environmental data specified by the manufacturer to illustrate the operating conditions under which power semiconductor devices, stacks, devices or equipment can work well.
Note: ① The rated value of the converter generally corresponds to the nominal value of the power system, and both values ​​should be within the allowable specified range of variation. ②Semiconductor devices are different from other electrical components. As long as the maximum rated value is exceeded, even if the operating time is very short, they will be damaged. ③The limits of the rated value change, including the upper limit and (or) lower limit, should be specified. 3.1.3.2 Rated frequency f% ratedfrequency The frequency of the converter AC side specified.
GB/T3859.1-93
3.1.3.3 Rated grid voltage ULN·rated voltage on the line side The specified RMS value of the grid-side line voltage of the converter corresponding to the rated tapping of the transformer (if any). 3.1.3.4 Rated valve-side voltage Uvnrated voltage on the valve side (of the transformer) The no-load RMS voltage between the two terminals of the valve-side winding of the same commutation group that are in succession when the transformer is at rated tapping and rated grid-side voltage. For converters without transformers (direct-connected converters), the rated valve-side voltage is the same as the rated grid-side voltage. 3.1.3.5 Rated grid current ILNrated current on the line side The maximum RMS current of the converter on the grid side under rated operating conditions (rated operating conditions). This value should take into account the most unfavorable combination of rated load current and all other operating conditions within the specified range (e.g., the deviation range of grid-side voltage and frequency). Note: ① When calculating this rated value from the rated DC current, for multi-phase equipment, it is assumed that the current of the converter circuit unit is a rectangular wave; for single-phase equipment, the calculation basis should be stated in the relevant documents. ② The rated grid-side current should take into account the current of the converter auxiliary circuit, as well as the influence of the ripple and circulating current (if any) of the DC current. 3.1.3.6 Rated valve-side current Ivnratedcurrentonthevalveside The maximum root mean square current of the valve side of the converter under rated operating conditions. This value should take into account the most unfavorable combination of the rated load current and all other operating conditions within the specified range (such as the deviation range of the grid-side voltage and frequency). Note: For multi-phase equipment, it is assumed that the current waveform of the converter circuit unit is a rectangular wave; for single-phase equipment, the calculation basis should be stated in the relevant documents. 3.1.3.7 Rated apparent power on the line side SLNratedapparentpoweronthelineside The total apparent power on the grid-side terminals at rated frequency, rated grid-side voltage and rated grid-side current. 3.1.3.8 Rated DC voltage Uanrateddirectvoltage The average value of the DC voltage between the DC terminals when the DC current of the converter is the rated value. 3.1.3.9 Rated DC current Ianrateddirectcurrent The average DC current specified by the manufacturer for the converter under the specified load conditions and operating conditions. Note: When expressing the relative value of other currents, this value is 100%. 3.1.3.10 Rated (maximum) continuous DC current IdmNratedcontinuousdirectcurrent (maximumvalue) The average value of the maximum DC current that the converter can continuously pass without being damaged under the specified operating conditions. Note: ① The rated continuous DC current of the device is basically always higher than the rated DC current of the corresponding entire equipment. ② The rated continuous DC current of the device may be limited by other components other than semiconductor devices (such as cooling system). 3.1.3.11 Rated DC power Panratedd.c.power The product of the rated DC voltage and the rated DC current under the specified rated operating conditions and the extreme operating conditions specified by the manufacturer. Note: Due to the influence of voltage and current ripple, the measured DC power may be greater than the defined rated DC power. fconversion factor
3.1.3.12 Conversion factor
The ratio of the input AC fundamental power when outputting DC power (its reciprocal when inverting). 3.1.3.13 Power efficiencypowerefficiencyThe ratio of the output power of the converter to the input power. Note: ① The conversion factor does not take into account the power generated by the AC component on the DC side, while the power efficiency includes it. Therefore, for rectification operation, the value of the conversion factor is smaller than the power efficiency. For example, for a single-phase, two-pulse (full-wave) resistive load converter, the theoretical maximum value of the conversion factor is 0.81, while the ideal power efficiency can reach 1.
② The conversion factor can only be measured directly; the power efficiency can be measured directly or calculated from the measured internal losses. ③ When it does not cause mixed slip, the power efficiency can be referred to as efficiency. 3.1.3.14 Total power factor totalpowerfactor The ratio of active power to apparent power.
Active power
Apparent power
5 Displacement factor (fundamental power factor) cos9wave)
displacement factor (power factor of the fundamentalGB/T3859.1—93
The ratio of the active power of the fundamental voltage and current to their apparent power. Active power of the fundamental wave
Apparent power of the fundamental wave
3.1.3.16 Relative fundamental content relativefundamentalcontent, fundamental factor (distortion factor) fundamentalfactor(deformation factor)
The ratio of the total power factor (in) to the displacement factor (fundamental power factor) cos9. cosg
relative harmonic content harmonic distortion3.1.3.17 Relative harmonic content Harmonic distortion factor The ratio of the root mean square value of the harmonic content to the root mean square value of the alternating current. 3.1.3.18 Ideal no-load direct voltage Uaideal no-loaddirectvoltage The theoretical no-load direct voltage of the rectifier or inverter under the assumption that there is no phase control, the converter has no voltage drop (mainly the threshold voltage of the electronic valve device), and there is no voltage surge when lightly loaded. It can be calculated by the phase-to-phase voltage Uvo, the number of commutations q and the number of series commutation groups s on the DC side using the following formula: ×
Uai = Uvo ×
controlled ideal no-load direct voltage 3.1.3.19 Ideal no-load DC voltage Udia of phase control is the theoretical no-load DC average voltage of the converter with phase control, assuming that there is no voltage drop and no voltage surge when lightly loaded. It can be calculated by the following formula:
For uniform connection:
(1) If the DC current is continuous within the entire control range, then: Udia = Ua X cosα
(2) If the converter load is purely resistive,
For α-
Total unit
For quantity one < quantity + unit.
Unit + unit
For non-uniform connection:
Udia=UaiXcosα
Uaia = Ua × -S
sin(α
yuan/）
2sin（yuan/p）
Udie=0.5×Ua×(1+cosα）
conventional no-load direct voltage3.1.3.20
0Conventional no-load direct voltage Ud.
Under no phase control conditions, the DC voltage/current (VI) characteristic curve is extended from the DC current continuous area to the DC average voltage obtained at zero current (see Figure 3).
Note: Ua is equal to the sum of Uao and the no-load voltage drop of the converter. 3.1.3.21 Phase-controlled conventional no-load direct voltage Udoacontrolled conventional no-load direct voltageUnder phase control conditions, the conventional no-load DC average voltage is obtained by extending the DC voltage/current characteristic curve corresponding to the delay angle α to zero current (see Figure 3).
3.1.3.22 Transition current transitioncurrent The average DC current of the converter circuit when the DC current of the commutation group just begins to be interrupted as the current decreases (see Figure 3). Note: At the transition current, the voltage/current characteristic curve is curved. Transition current may occur in the following situations: for example, under reverse electromotive force load, because the inductance of the DC circuit is insufficient to maintain the continuous flow of DC current throughout the cycle, or because the DC current decreases below the critical value that makes the balancing reactor lose its function.
3.1.3.23 DC voltage adjustment value directvoltageregulation The difference between the DC voltage at no load and the DC voltage at rated DC current, keeping the delay angle unchanged and excluding the correction effect of the voltage stabilization device (if any) (see Figure 3).
Note: If the nature of the DC circuit (such as capacitor bank, reverse electromotive force load) has a significant effect on the voltage change, special consideration should be given. DC voltage
Transition current
GB/T3859.1-93
Total DC voltage adjustment value
Figure 3 Voltage adjustment value
DC current
3.1.3.24 Inherent DC voltage adjustment value inherentdirectvoltageregulation The DC voltage adjustment value when the impedance effect of the AC system and the correction effect of the voltage stabilizing facilities (if any) are not taken into account. 3.1.3.25 Total DC voltage adjustment value totaldirect.voltageregulation The DC voltage adjustment value when the DC current includes the impedance effect of the AC system but does not include the correction effect of the voltage stabilizing facilities (if any). 3.1.3.26 Output voltage tolerance range outputvoltagetoleranceband The specified range within which the steady-state value of the stable output voltage deviates from its nominal value or set value. 3.1.3.27 Electrical disturbance electricaldisturbance Any change in electrical quantity beyond the specified limit. Electrical disturbances may cause performance degradation, work interruption or damage to the converter. 3.1.3.28 System disturbance system born disturbed disturbances Electrical disturbances caused by a series of situations such as changes in the load of the distribution system, the transient process of switches, changes in the structure of the power supply network, etc., which can only be determined by statistical values ​​(see GB 10236 and GB/T 3859.2 for details). 3.1.3.29 Converter disturbances converter generated disturbances Disturbances caused by nonlinear changes in the converter load (see 5.7.6 and GB 3859.2 for details). 3.1.3.30 Converter disturbance level level of generated disturbance of a converter The amount of disturbance generated when the converter operates under specified conditions. 3.1.3.31 Reference level of generated disturbance of a converter disturbance When the actual operating conditions are unknown and the rated operating conditions are used to calculate or measure the disturbance level, the disturbance level generated by the converter is assumed.
Note: The disturbance level generally depends on the power supply impedance, which may not be considered as a characteristic parameter of the converter. 3.1.3.32 Converter disturbed level When the disturbance exceeds the specified value, the degree of impact on the converter operation can generally be divided into three situations, namely Class F (affecting performance), Class T (interruption of operation), and Class D (damage) (see 5.7.7). 3.1.3.33 Converter immunity class The ability of the converter to withstand electrical disturbances. As long as any disturbance does not exceed the limit value of the specified level (see 5.2.2), the converter can work normally.
3.1.3.34 Compatibility of the converter and the grid If the specified limit value of the converter immunity level is not lower than the allowable fluctuation limit of the grid parameters (see 5.2.2), the converter is said to be compatible with the grid.
GB/T3859.1—93
3.1.3.35 Short-circuit ratio Rasrelativeshort-circuitpower The ratio of the power supply short-circuit capacity at a specified point in the network to the apparent power on the grid side of the converter under specified operating conditions and specified network structure.
3.1.3.36 Fault terms
See GB/T2900.33 and GB/T3859.2. 3.1.3.37 System compatibility and radio frequency interference terms See GB10236 and related standards.
3.2 Symbols and subscripts
3.2.1 Letters used in subscripts and their meanings
0 (zero)
No-load
DC current or voltage
Frequency-related
Corresponding to h-order harmonic components
Corresponding to the grid or power supply
Rated value or under rated load
Inherent
Repetitive (overvoltage)
Resistive
Non-repetitive (overvoltage)
Inductive
Phase control value (with the help of delay angle)
: Symbols and their meanings
DC voltage regulation (based on Ua) ) Resistive DC voltage regulation (based on U) Inductive DC voltage regulation (based on U) Inductive DC voltage regulation caused by converter transformer, based on U Percentage of inductive component of converter transformer short-circuit voltage corresponding to ILN Rated frequency
Number of commutation groups of shunt Ian
Order of harmonics
DC current (arbitrarily specified value)
Rated DC current
Rated continuous DC current (maximum value)
Rated value of grid-side RMS current IL (of converter or transformer)
RMS value of fundamental component of IL
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