CN108318744A - A kind of converter valve thyristor level damping circuit parameter test device and method - Google Patents
A kind of converter valve thyristor level damping circuit parameter test device and method Download PDFInfo
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Abstract
本发明涉及一种换流阀晶闸管级阻尼回路参数测试装置与方法，包括控制系统、测量系统、供电回路，通过在测量系统中设置接口，采集采样电阻两端电压的负向峰值、交流电源电压的负向峰值，根据这些采集得到的数值，结合晶闸管触发控制板取能电路反向二极管的导通压降，计算得到阻尼回路参数，保证了阻尼电阻和电容值测试的准确性和可靠性，且装置结构简单、价格便宜，操作安全便捷。
The invention relates to a device and method for testing the thyristor-level damping circuit parameters of a converter valve, including a control system, a measurement system, and a power supply circuit. By setting an interface in the measurement system, the negative peak value of the voltage at both ends of the sampling resistor and the AC power supply voltage are collected. According to these collected values, combined with the conduction voltage drop of the reverse diode of the energy harvesting circuit of the thyristor trigger control board, the parameters of the damping circuit are calculated to ensure the accuracy and reliability of the damping resistance and capacitance value test, and The structure of the device is simple, the price is cheap, and the operation is safe and convenient.
Description
技术领域technical field
本发明属于高电压直流输电技术领域，具体涉及一种换流阀晶闸管级阻尼回路参数测试装置与方法。The invention belongs to the technical field of high-voltage direct current transmission, and in particular relates to a device and method for testing parameters of a thyristor-level damping circuit of a converter valve.
背景技术Background technique
换流阀是高压直流输电工程中的重要元件，由于高压直流输电电压等级高，换流阀通常由多级晶闸管串联组成。阻尼回路作用是保证串联晶闸管间的电压分布均匀，由阻尼电阻和阻尼电容组成，其对直流输电的安全运行具有重要意义。因此，阻尼回路元件参数的准确测试极其重要。但是由于单个换流站就有上千个晶闸管级，检修时开展阻尼回路参数测量工作巨大。The converter valve is an important component in the HVDC transmission project. Due to the high voltage level of the HVDC transmission, the converter valve is usually composed of multi-stage thyristors connected in series. The function of the damping circuit is to ensure the uniform voltage distribution between the series thyristors, which is composed of damping resistance and damping capacitance, which is of great significance to the safe operation of DC transmission. Therefore, accurate testing of damping circuit component parameters is extremely important. However, since there are thousands of thyristor stages in a single converter station, it is a huge task to measure the parameters of the damping circuit during maintenance.
对换流阀阻尼回路测试的传统方法主要是利用万用表、电桥等进行直接测试，这种方法需要将接线连接至换流阀中阻尼电容C和阻尼电阻R两端。由于晶闸管电子电路(Thyristor Electronic，TE板)结构换流阀中，阻尼电容C和阻尼电阻R分别位于换流阀组件两侧，接线不方便，需要多个试验人员配合，花费大量时间完成。The traditional method of testing the damping circuit of the converter valve is mainly to use a multimeter, an electric bridge, etc. for direct testing. This method needs to connect the wires to both ends of the damping capacitor C and the damping resistor R in the converter valve. Since the thyristor electronic circuit (Thyristor Electronic, TE board) structure converter valve, the damping capacitor C and damping resistor R are respectively located on both sides of the converter valve assembly, the wiring is inconvenient and requires the cooperation of multiple testers, which takes a lot of time to complete.
近年来，也有部分单位将测量装置出线安装至伸缩杆，以方便试验人员测量时将接线连接至电容C和电阻R两端的方法。该方法相对与传统的测试方法，测试速度和方便程度上有所提高。但是，由于试验时，伸缩杆需跨过晶闸管、TE板、阻尼电阻和阀组件内高压接线，容易接触到上述设备，引起其他问题，安全性较差。In recent years, some units have also installed the outgoing line of the measuring device on the telescopic rod to facilitate the method of connecting the wires to both ends of the capacitor C and the resistor R when measuring. Compared with the traditional test method, this method has improved test speed and convenience. However, during the test, the telescopic rod needs to cross the thyristor, TE plate, damping resistor and high-voltage wiring in the valve assembly, so it is easy to touch the above-mentioned equipment, causing other problems and poor safety.
公布号为CN104808070A的中国专利提出了一种阻尼回路参数测试方法，如图1所示，是通过将50Hz的工频交流电源施加在晶闸管级试品两端，同时利用晶闸管级试品电压和电流的相位差，来计算阻尼电阻和阻尼电容，但未考虑串联在阻尼回路中的晶闸管触发及监测电子设备取能电路。The Chinese patent with the publication number CN104808070A proposes a damping circuit parameter test method, as shown in Figure 1, by applying a 50Hz power frequency AC power supply to both ends of the thyristor-level test product, and simultaneously using the voltage and current of the thyristor-level test product The phase difference is used to calculate the damping resistance and damping capacitance, but the thyristor triggering and monitoring electronic equipment energy-taking circuit connected in series in the damping loop is not considered.
由于换流阀通常采用悬吊结构，阻抗测试时，将接线连接至阻尼电阻和阻尼电容极为不方便，将测试装置输出连接至晶闸管阴极和阳极散热器简便易操作。Since the converter valve usually adopts a suspension structure, it is extremely inconvenient to connect the wiring to the damping resistor and damping capacitor during the impedance test. It is easy to operate by connecting the output of the test device to the cathode and anode radiators of the thyristor.
发明内容Contents of the invention
为克服上述弊端，提出一种既符合换流阀结构设计，又考虑到阻尼回路中串联的TE板取能电路的测试方法，其测试结果准确，且方便换流阀工程现场实施。In order to overcome the above drawbacks, a test method that not only conforms to the structural design of the converter valve, but also considers the energy harvesting circuit of the TE plate in series in the damping circuit is proposed. The test result is accurate and it is convenient for the on-site implementation of the converter valve project.
本发明的目的是提供一种换流阀晶闸管级阻尼回路参数测试装置与方法，用于解决现有技术中阻尼回路参数的测量不准确、测试设备不安全的问题。The object of the present invention is to provide a thyristor-level damping circuit parameter testing device and method for a converter valve, which are used to solve the problems of inaccurate measurement of damping circuit parameters and unsafe testing equipment in the prior art.
为解决上述技术问题，本发明提出一种换流阀晶闸管级阻尼回路参数测试装置，包括控制系统、测量系统，控制系统连接测量系统，还包括用于为晶闸管级供电的供电回路，供电回路用于供电连接阻尼电阻、阻尼电容和TE板的取能电路，供电回路设置有交流电源和采样电阻；测量系统设置有用于测量所述采样电阻两端电压的接口，用于测量所述交流电源电压的接口。In order to solve the above technical problems, the present invention proposes a device for testing the parameters of the thyristor level damping circuit of a converter valve, including a control system, a measurement system, the control system is connected to the measurement system, and a power supply circuit for supplying power to the thyristor level. For the energy harvesting circuit connected to the damping resistor, damping capacitor and TE board for power supply, the power supply circuit is provided with an AC power supply and a sampling resistor; the measurement system is provided with an interface for measuring the voltage at both ends of the sampling resistor, for measuring the AC power supply voltage Interface.
进一步，所述供电回路还设置有隔离变压器，交流电源通过隔离电压器连接所述采样电阻。Further, the power supply circuit is also provided with an isolation transformer, and the AC power supply is connected to the sampling resistor through an isolation voltage transformer.
进一步，所述供电回路还设置有继电器。Further, the power supply circuit is also provided with a relay.
进一步，所述测量系统包括采样电路和信号调理电路，采样电路通过信号调理电路连接所述控制系统，采样电路中设置有所述用于测量所述采样电阻两端电压的接口，用于测量所述交流电源电压的接口。Further, the measurement system includes a sampling circuit and a signal conditioning circuit, the sampling circuit is connected to the control system through the signal conditioning circuit, and the sampling circuit is provided with the interface for measuring the voltage at both ends of the sampling resistor for measuring the interface for the AC mains voltage described above.
进一步，所述控制系统包括DSP和显示系统。Further, the control system includes a DSP and a display system.
为解决上述技术问题，本发明还提出一种换流阀晶闸管级阻尼回路参数测试方法，包括如下步骤：In order to solve the above-mentioned technical problems, the present invention also proposes a method for testing the parameters of the thyristor-level damping circuit of the converter valve, which includes the following steps:
1)换流阀中，阻尼回路并联在晶闸管两端，供电回路设置有交流电源和采样电阻，将供电回路两个输出端子分别连接至晶闸管阳极和阴极，供电回路施加交流电压时，采集采样电阻两端电压的负向峰值，采集交流电源电压的负向峰值；1) In the converter valve, the damping circuit is connected in parallel at both ends of the thyristor. The power supply circuit is provided with an AC power supply and a sampling resistor. Connect the two output terminals of the power supply circuit to the anode and cathode of the thyristor respectively. When an AC voltage is applied to the power supply circuit, the sampling resistor The negative peak value of the voltage at both ends, collect the negative peak value of the AC power supply voltage;
2)根据所述采样电阻两端电压的负向峰值的采样时刻，和交流电源电压的负向峰值的采样时刻的差值，计算供电回路电流和交流电源电压的相位差；2) Calculate the phase difference between the power supply circuit current and the AC power supply voltage according to the difference between the sampling time of the negative peak value of the voltage across the sampling resistor and the sampling time of the negative peak value of the AC power supply voltage;
3)根据所述采样电阻两端电压的负向峰值、交流电源电压的负向峰值，结合已知的TE板取能电路中反向二极管的导通压降，及所述相位差，计算得到阻尼电阻值和阻尼电容值。3) According to the negative peak value of the voltage across the sampling resistor and the negative peak value of the AC power supply voltage, combined with the known conduction voltage drop of the reverse diode in the energy harvesting circuit of the TE board, and the phase difference, the damping is calculated. Resistor value and damping capacitor value.
进一步，所述供电回路还设置有隔离变压器，交流电源通过隔离电压器连接所述采样电阻；所述交流电源电压的负向峰值为隔离变压器的副边电压的负向峰值。Further, the power supply circuit is also provided with an isolation transformer, and the AC power supply is connected to the sampling resistor through an isolation voltage transformer; the negative peak value of the AC power supply voltage is the negative peak value of the secondary side voltage of the isolation transformer.
进一步，步骤2)中所述相位差的计算式如下：Further, the calculation formula of phase difference described in step 2) is as follows:
δ＝t*2π/Tδ=t*2π/T
式中，δ为所述相位差，T为采样周期，t为所述采样电阻两端电压的负向峰值的采样时刻与交流电源电压的负向峰值或隔离变压器的副边电压的采样时刻的差值。In the formula, δ is the phase difference, T is the sampling period, and t is the difference between the sampling time of the negative peak value of the voltage across the sampling resistor and the negative peak value of the AC power supply voltage or the sampling time of the secondary side voltage of the isolation transformer. difference.
进一步，步骤3)中所述阻尼电阻和阻尼电容的计算式如下：Further, the calculation formula of damping resistance and damping capacitance described in step 3) is as follows:
R＝(Um-Udiode)*RL*cos(t*2π/T)/URlm-RL R＝(U m -U diode )*R L *cos(t*2π/T)/U Rlm -R L
C＝URlm/[(Udiode-Um)*RL*sin(t*2π/T)*2πf]C＝U Rlm /[(U diode -U m )*R L *sin(t*2π/T)*2πf]
式中，R为阻尼电阻，C为阻尼电容，Um为交流电源电压的负向峰值或隔离变压器的副边电压的负向峰值，RL为采样电阻，URlm为采样电阻两端电压的负向峰值，Udiode为TE板取能电路中反向二极管的导通压降，f为交流电源的频率。In the formula, R is the damping resistance, C is the damping capacitor, U m is the negative peak value of the AC power supply voltage or the negative peak value of the secondary side voltage of the isolation transformer, RL is the sampling resistor, U Rlm is the voltage across the sampling resistor Negative peak value, U diode is the conduction voltage drop of the reverse diode in the energy harvesting circuit of the TE board, and f is the frequency of the AC power supply.
进一步，当所述阻尼电阻在设定的电阻范围内，且所述阻尼电容在设定的电容范围内时，判定所述晶闸管级的阻尼回路参数合格。Further, when the damping resistance is within a set resistance range and the damping capacitance is within a set capacitance range, it is determined that the parameters of the damping loop of the thyristor stage are qualified.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明的阻尼回路参数测试装置结构简单，包括控制系统、测量系统、供电回路，通过在测量系统中设置接口，采集采样电阻两端电压的负向峰值、交流电源电压的负向峰值，结合TE板取能电路中反向二极管的导通压降，并根据这些采集得到的数值，能计算得到阻尼回路参数，保证了阻尼电阻和电容值测试的准确性和可靠性，且装置结构简单、价格便宜，操作安全便捷。The damping loop parameter testing device of the present invention has a simple structure, including a control system, a measurement system, and a power supply loop. By setting an interface in the measurement system, the negative peak value of the voltage at both ends of the sampling resistor and the negative peak value of the AC power supply voltage are collected, combined with TE The conduction voltage drop of the reverse diode in the board energy harvesting circuit, and according to the collected values, the damping circuit parameters can be calculated, which ensures the accuracy and reliability of the damping resistance and capacitance value testing, and the device structure is simple and cheap , safe and convenient operation.
进一步，本发明的供电回路中还设置有隔离变压器，有效抑制高频杂波窜入供电回路，使测量系统能够采集到比较纯净的采样电阻两端电压的负向峰值波形、TE板取能电路中反向二极管的导通电压波形，以及隔离变压器的副边电压的负向峰值波形，提高了计算阻尼电阻和阻尼电容的精度。Further, the power supply circuit of the present invention is also provided with an isolation transformer, which can effectively suppress high-frequency clutter from entering the power supply circuit, so that the measurement system can collect relatively pure negative peak waveforms of the voltage at both ends of the sampling resistor and the TE board energy harvesting circuit. The conduction voltage waveform of the reverse diode and the negative peak waveform of the secondary side voltage of the isolation transformer improve the accuracy of calculating the damping resistance and the damping capacitance.
附图说明Description of drawings
图1是现有技术的一种阻尼回路参数测试装置的系统框图；Fig. 1 is the system block diagram of a kind of damping circuit parameter testing device of prior art;
图2是本发明的一种阻尼回路参数测试装置的系统框图；Fig. 2 is a system block diagram of a damping loop parameter testing device of the present invention;
图3是TE板取能电路原理示意图；Figure 3 is a schematic diagram of the principle of the energy harvesting circuit of the TE board;
图4是采样电阻与隔离变压器的电压采集波形图；Fig. 4 is a voltage acquisition waveform diagram of the sampling resistor and the isolation transformer;
图5是阻尼回路阻抗向量图。Figure 5 is a vector diagram of the impedance of the damping loop.
具体实施方式Detailed ways
下面结合附图对本发明的具体实施方式作进一步的说明。The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
本发明的一种阻尼回路参数测试装置如图2所示，包括控制系统、测量系统，及用于为晶闸管级供电的供电回路。其中，控制系统连接测量系统，供电回路设置有交流电源、采样电阻RL、隔离变压器和继电器，隔离变压器的一端通过继电器连接交流电源、另一端连接采样电阻；测量系统设置有用于测量采样电阻RL两端电压的负向峰值的接口C2，用于测量所述交流电源电压的负向峰值的接口C1。晶闸管级包括晶闸管VT，以及阻尼电阻R、阻尼电容C、TE板的取能电路串联组成的阻尼回路，晶闸管VT与阻尼回路并联。A damping circuit parameter testing device of the present invention is shown in FIG. 2 , including a control system, a measurement system, and a power supply circuit for supplying power to the thyristor stage. Among them, the control system is connected to the measurement system, and the power supply circuit is provided with an AC power supply, a sampling resistor R L , an isolation transformer and a relay. One end of the isolation transformer is connected to the AC power supply through the relay, and the other end is connected to the sampling resistor; The interface C 2 for the negative peak value of the voltage across L , and the interface C 1 for measuring the negative peak value of the AC power supply voltage. The thyristor stage includes a thyristor VT, and a damping circuit composed of a series connection of a damping resistor R, a damping capacitor C, and a TE board energy-taking circuit, and the thyristor VT is connected in parallel with the damping circuit.
上述阻尼回路参数测试装置实现的测试方法包括以下步骤：The test method realized by the above-mentioned damping circuit parameter test device comprises the following steps:
1)控制交流电源施加至晶闸管级，采集采样电阻两端电压的负向峰值，采集交流电源电压的负向峰值；1) Control the application of AC power to the thyristor stage, collect the negative peak value of the voltage across the sampling resistor, and collect the negative peak value of the AC power voltage;
2)根据所述采样电阻两端电压的负向峰值的采样时刻，和交流电源电压的负向峰值的采样时刻的差值，计算供电回路电流和交流电源电压的相位差；2) Calculate the phase difference between the power supply circuit current and the AC power supply voltage according to the difference between the sampling time of the negative peak value of the voltage across the sampling resistor and the sampling time of the negative peak value of the AC power supply voltage;
3)根据采样电阻两端电压的负向峰值、交流电源电压的负向峰值、结合已知的TE板取能电路中反向二极管的导通压降，及上述相位差，得到阻尼电阻和阻尼电容；3) According to the negative peak value of the voltage at both ends of the sampling resistor, the negative peak value of the AC power supply voltage, the known conduction voltage drop of the reverse diode in the energy harvesting circuit of the TE board, and the above-mentioned phase difference, the damping resistance and the damping capacitance are obtained ;
4)当阻尼电阻在设定的电阻范围内，且所述阻尼电容在设定的电容范围内时，判定所述晶闸管级的阻尼回路参数合格。4) When the damping resistance is within the set resistance range and the damping capacitance is within the set capacitance range, it is determined that the damping circuit parameters of the thyristor stage are qualified.
本发明的测试装置结构原理简单，通过采集采样电阻两端电压的负向峰值、交流电源电压的负向峰值，并根据这些采集得到的数值结合TE板取能电路中反向二极管的导通压降，能计算得到阻尼回路参数，保证了阻尼电阻和电容值测试的准确性和可靠性，且装置价格便宜，操作安全便捷。The test device of the present invention has a simple structure and principle, by collecting the negative peak value of the voltage at both ends of the sampling resistor and the negative peak value of the AC power supply voltage, and combining the values obtained by these collections with the conduction voltage drop of the reverse diode in the energy harvesting circuit of the TE board , the parameters of the damping circuit can be calculated, which ensures the accuracy and reliability of the damping resistance and capacitance value testing, and the device is cheap, and the operation is safe and convenient.
为了便于测试接线，测试装置将50Hz工频交流电源施加于被测晶闸管级两端。由于晶闸管处于关断状态，变压器副边等效为阻尼回路、TE板和采样电阻RL的串联电路。如图2所示，供电回路电流为正向时，TE板取能电路串联至阻尼回路中；供电回路电流为负向时，TE板反向二极管导通，将TE板取能电路旁路。本发明利用晶闸管阻尼回路电流为负相时，TE板反向二极管导通的特性，通过测量采样电阻两端电压负向峰值URlm，计算回路电流负向峰值Im，计算式为Im＝URlm/RL。同时，测量隔离变压器副边电压负向峰值Um，及TE板取能电路中反向二极管的导通压降Udiode，结合URlm和Um产生的时间差t，计算阻尼回路参数。In order to facilitate the test wiring, the test device applies 50Hz power frequency AC power to both ends of the thyristor stage under test. Since the thyristor is in the off state, the secondary side of the transformer is equivalent to a series circuit of the damping loop, the TE plate and the sampling resistor RL . As shown in Figure 2, when the power supply circuit current is positive, the TE board energy harvesting circuit is connected in series to the damping circuit; when the power supply circuit current is negative, the TE board reverse diode conducts, and the TE board energy harvesting circuit is bypassed. In the present invention, when the thyristor damping loop current is in negative phase, the reverse diode conduction characteristic of the TE plate is used, and the negative peak value U Rlm of the voltage across the sampling resistor is measured to calculate the negative peak value I m of the loop current. The calculation formula is I m = U Rlm /R L . At the same time, measure the negative peak value U m of the secondary side voltage of the isolation transformer, and the conduction voltage drop U diode of the reverse diode in the energy harvesting circuit of the TE board, and combine the time difference t generated by U Rlm and U m to calculate the parameters of the damping circuit.
根据上述采集到的值，列取供电回路中回路阻抗的计算式：According to the values collected above, the calculation formula of the loop impedance in the power supply loop is listed:
Z＝│Z│cosδ+j│Z│sinδZ＝│Z│cosδ+j│Z│sinδ
│Z│＝(Um-Udiode)*RL/URlm │Z│＝(Um-U diode )*R L /U Rlm
Z＝R+RL-j/2πfCZ＝R+R L -j/2πfC
式中，Z为回路阻抗，│Z│为回路阻抗幅值，R为阻尼电阻，C为阻尼电容，f为采集频率，优选50Hz工频，δ为供电回路电流和隔离变压器的副边电压的相位差，由于采样电阻RL为高精度无感采样电阻，回路电流的相位与采样电阻两端电压负向峰值URlm的相位相同，因此，供电回路电流和隔离变压器的副边电压的相位差，等于采样电阻两端电压负向峰值URlm与隔离变压器的副边电压Um的相位差，计算式如下：In the formula, Z is the loop impedance, │Z│ is the amplitude of the loop impedance, R is the damping resistance, C is the damping capacitance, f is the acquisition frequency, preferably 50Hz power frequency, δ is the difference between the power supply loop current and the secondary side voltage of the isolation transformer Phase difference, since the sampling resistor RL is a high-precision non-inductive sampling resistor, the phase of the loop current is the same as that of the negative peak U Rlm of the voltage across the sampling resistor, so the phase difference between the power supply loop current and the secondary voltage of the isolation transformer , which is equal to the phase difference between the negative peak value U Rlm of the voltage across the sampling resistor and the secondary voltage U m of the isolation transformer, and the calculation formula is as follows:
δ＝t*2π/Tδ=t*2π/T
式中，T为采样周期，为20ms，t为所述采样电阻两端电压的负向峰值的采样时刻，与隔离变压器的副边电压的采样时刻的差值，如图5所示。In the formula, T is the sampling period, which is 20 ms, and t is the difference between the sampling time of the negative peak value of the voltage across the sampling resistor and the sampling time of the secondary side voltage of the isolation transformer, as shown in FIG. 5 .
结合上述公式，得到阻尼电阻和阻尼电容的计算式：Combining the above formulas, the calculation formulas of damping resistance and damping capacitance are obtained:
R＝(Um-Udiode)*RL*cos(t*2π/T)/URlm-RL R＝(U m -U diode )*R L *cos(t*2π/T)/U Rlm -R L
C＝URlm/[(Udiode-Um)*RL*sin(t*2π/T)*2πf]C＝U Rlm /[(U diode -U m )*R L *sin(t*2π/T)*2πf]
式中，Um为交流电源电压的负向峰值或隔离变压器的副边电压的负向峰值，RL为采样电阻，URlm为采样电阻两端电压的负向峰值，Udiode为TE板取能电路中反向二极管的导通压降，f为交流电源的频率。In the formula, U m is the negative peak value of the AC power supply voltage or the negative peak value of the secondary side voltage of the isolation transformer, RL is the sampling resistor, U Rlm is the negative peak value of the voltage at both ends of the sampling resistor, and U diode is the energy taken by the TE board The conduction voltage drop of the reverse diode in the circuit, f is the frequency of the AC power supply.
计算出阻尼电阻和阻尼电容后，根据设定的参数范围，来判断测试结果是否合格，并通过显示系统进行显示。例如，阻尼电阻R在设定的电阻范围内，且阻尼电容C在设定的电容范围内时，判定被测晶闸管级的阻尼回路参数合格，若阻尼电阻和阻尼电容中任意参数不在设定的参数范围内，则判定为不合格。After calculating the damping resistance and damping capacitance, judge whether the test result is qualified according to the set parameter range, and display it through the display system. For example, when the damping resistance R is within the set resistance range and the damping capacitance C is within the set capacitance range, it is determined that the damping circuit parameters of the thyristor stage under test are qualified. If any parameter in the damping resistance and damping capacitance is not within the set If it is within the parameter range, it is judged as unqualified.
本发明接线方便，测试结果准确可靠。控制系统通过隔离变压器将50Hz的工频交流电源施加在被测晶闸管级两端，使得TE板取能电路中的反向二极管处于导通状态，测量回路电流信号和隔离变压器副边电压信号，根据上述电流和电压信号的负向峰值，并结合其相位差，可计算阻尼电阻和阻尼电容的数值。本发明的换流阀晶闸管级阻尼回路参数测试装置结构简单、接线方便、测试结果准确可靠。The invention has convenient wiring and accurate and reliable test results. The control system applies 50Hz power frequency AC power to both ends of the thyristor stage under test through the isolation transformer, so that the reverse diode in the TE board energy harvesting circuit is in the conduction state, and the loop current signal and the isolation transformer secondary voltage signal are measured. According to the above The negative peaks of the current and voltage signals, combined with their phase difference, can be used to calculate the values of the damping resistor and the damping capacitor. The device for testing the parameters of the thyristor level damping circuit of the converter valve of the invention has the advantages of simple structure, convenient wiring and accurate and reliable test results.
以上所述仅为本发明的优选实施例，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的权利要求范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.
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