CN112269061A - Valve section module component impedance measurement system - Google Patents
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Abstract
The invention discloses an impedance measuring system for a valve section module element, which comprises a main control unit, a signal excitation unit, a signal sampling unit and a display unit, wherein the main control unit is used for controlling the main control unit to drive the signal excitation unit to generate a signal; the signal excitation unit is used for generating and providing an excitation signal with certain voltage and frequency to the valve section module circuit; the signal sampling unit is used for acquiring a voltage signal and a current value of an element to be detected in the valve section module circuit; the main control unit is used for controlling the voltage amplitude and the frequency of the excitation signal provided by the signal excitation unit and obtaining the impedance value of the element to be tested through calculation according to the current value in the valve section module circuit collected by the signal sampling unit; the display unit is used for displaying the parameter value of the element to be tested, which is finally calculated by the main control unit. The invention realizes the non-disconnection measurement of the converter valve segment device, has high measurement precision and high measurement speed, the measured parameter value errors of the converter valve segment device are all within 5 percent, and in addition, the more the valve segments are, the more accurate the measurement result is.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current power transmission, in particular to an impedance measuring system for a valve section module element.
Background
When the transmission distance is long and the transmission capacity is large, direct current transmission is a preferable transmission scheme. The ultra-high voltage direct current transmission has the characteristics of point-to-point, ultra-long distance and high-capacity transmission capacity, and is a main transmission mode for ultra-long distance and ultra-large capacity outward transmission of a southwest large hydropower base and a northwest large coal power base in China. The converter station is one of main components of a high-voltage direct-current transmission system, realizes conversion from an alternating-current system to a direct-current system, and is a core technology of high-voltage direct-current transmission. The converter valve is a basic unit of the converter and is a key device for carrying out conversion. The converter valve is arranged in a layered mode and formed by connecting a plurality of valve modules in series, a single converter valve comprises thyristor-level, anode reactors, voltage-sharing capacitors and other core devices, parameters of the devices have important significance for stable and reliable operation of a direct-current power transmission system, and therefore before the direct-current power transmission project is put into operation and during equipment maintenance, detection tests need to be carried out on the core devices in the converter valve to ensure that the electrical performance of the converter valve meets design requirements, and the safety of the equipment and the reliability of the direct-current power transmission project are ensured.
In a direct current transmission system, a converter valve is a basic unit of a converter and is key equipment for carrying out conversion. The converter valve adopts a layered arrangement and is formed by connecting a plurality of valve modules in series. The converter valve single valve is formed by connecting 78 thyristor stages (3 redundancies) and 12 valve reactors in series. The plurality of valve sections form a single valve, which has the same electrical properties as the single valve, but only assumes a partial valve voltage. After 13 thyristor levels are connected with 2 valve reactors in series, 1 voltage-sharing capacitor is connected in parallel to form a valve section. Thus, 2 valve sections make up 1 module and 3 modules make up 1 single valve.
Foreign manufacturers start early in the research and development of impedance measurement equipment, the technology of the impedance measurement equipment is mature and reliable enough, the product measurement precision is high, the stability is strong, the functions are rich, the impedance measurement equipment can be applied to a plurality of advanced fields, the domestic impedance measurement research starts late, the progress is slow, and various research institutions and commercial companies have certain gaps compared with foreign institutions in the aspects of brand, research and development, sales and the like. Although the existing impedance tester has high precision, the non-disconnection measurement of a core device of the converter valve cannot be realized, and the disconnection measurement needs to be carried out one by one when the converter valve is maintained and overhauled, so that the measurement mode is time-consuming and labor-consuming, and the original equipment can be damaged. Although a TLP687 type thyristor-level impedance tester is introduced by German Siemens, the device can only realize the non-disconnection measurement of the parameters of the thyristor-level damping loop and cannot realize the non-disconnection measurement of the anode reactor and the voltage-sharing capacitor. Therefore, a new measuring system specially aiming at the core device of the converter valve is urgently needed to be developed, and the maintenance and overhaul efficiency is improved.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a valve section modular element impedance measurement system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a valve section module element impedance measuring system comprises a main control unit, a signal exciting unit, a signal sampling unit and a display unit;
the signal excitation unit is used for generating and providing an excitation signal with certain voltage and frequency to the valve section module circuit, the input end of the signal excitation unit is connected with the main control unit, and the output end of the signal excitation unit is used for being connected with the valve section module circuit;
the signal sampling unit is used for collecting a voltage signal and a current value of an element to be detected in the valve section module circuit, the output end of the signal sampling unit is connected with the main control unit, and the input end of the signal sampling unit is used for being connected with the valve section module circuit;
the main control unit is a single chip microcomputer and is used for controlling the voltage amplitude and the frequency of an excitation signal provided by the signal excitation unit and obtaining the impedance value of the element to be tested through calculation according to the current value in the valve section module circuit collected by the signal sampling unit;
and the display unit is used for displaying the parameter value of the element to be tested, which is finally calculated by the main control unit, and the input end of the display unit is connected with the main control unit.
Further, the signal excitation unit comprises a signal generator, a low-pass filter, a power amplifier and an output stage, the signal generator, the low-pass filter, the power amplifier and the output stage are sequentially connected, the input end of the signal generator is connected with the main control unit, and the output stage is used for being connected with the valve section module circuit and providing excitation signals with certain voltage and frequency generated in the signal excitation unit.
Further, the low pass filter is a 7 th order elliptic filter.
Further, the signal sampling unit includes sampling resistor, I-V conversion module, buffering amplifier module, first multiplexer and effective value conversion module, sampling resistor and valve section module circuit connection, I-V conversion module's input and sampling resistor are connected, the input that the buffering amplifier module is connected with the component that awaits measuring of valve section module circuit, I-V conversion module and buffering amplifier module's output all are connected with the input of first multiplexer, the output of first multiplexer is connected with effective value conversion module's input, effective value conversion module's output is connected with main control unit's ADC port.
Furthermore, the output end of the first multiplexer is also connected with an adder, and the output end of the adder is connected with an ADC port of the main control unit.
Furthermore, a second multiplexer is connected between the adder, the effective value conversion module and the ADC of the main control unit.
Further, when the signal sampling unit detects the voltage-sharing capacitor, an external amplitude detection or effective value detection circuit is used for obtaining the amplitude or effective value of the voltage and the current; when other objects are measured, the ADC is adopted to directly sample the voltage and current signals, and a software method is utilized to restore and analyze the signals.
Further, the I-V conversion module is a trans-impedance amplifier.
Further, the display unit is used for displaying the inductance of the anode reactor in the valve section module circuit, the impedance of the damping resistor, the capacitance of the damping capacitor and the capacitance of the voltage-sharing capacitor.
Compared with the prior art, the invention has the following advantages:
the invention realizes the non-disconnection measurement of the converter valve segment device, has high measurement precision and high measurement speed, and through simulation verification, the measured parameter value error of the converter valve segment device is within 5% no matter the voltage is accurate to 10mV or 100mV, and in addition, the more the valve segments are, the more the measurement result is accurate.
Drawings
FIG. 1 is a system block diagram of a valve section modular element impedance measurement system;
FIG. 2 is a block diagram of a signal excitation unit of a valve section modular element impedance measurement system;
FIG. 3 is a circuit block diagram of a passive 7 th order elliptic filter of the valve section modular element impedance measurement system;
FIG. 4 is a voltage acquisition schematic block diagram of a valve section modular element impedance measurement system;
FIG. 5 is a schematic block diagram of current collection for a valve section modular element impedance measurement system;
FIG. 6 is a block diagram of a full wave rectifier circuit of the effective value transformation module of the valve section module component impedance measurement system;
FIG. 7 is a block diagram of a high input impedance full wave rectifier circuit of the effective value transformation module of the valve section module component impedance measurement system;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
As shown in fig. 1, an impedance measuring system for a valve segment module element includes a main control unit, a signal excitation unit, a signal sampling unit, and a display unit;
the signal excitation unit is used for generating and providing an excitation signal with certain voltage and frequency to the valve section module circuit, the input end of the signal excitation unit is connected with the main control unit, and the output end of the signal excitation unit is used for being connected with the valve section module circuit;
the signal sampling unit is used for collecting a voltage signal and a current value of an element to be detected in the valve section module circuit, the output end of the signal sampling unit is connected with the main control unit, and the input end of the signal sampling unit is used for being connected with the valve section module circuit;
the main control unit is a single chip microcomputer and is used for controlling the voltage amplitude and the frequency of an excitation signal provided by the signal excitation unit and obtaining the impedance value of the element to be tested through calculation according to the current value in the valve section module circuit collected by the signal sampling unit;
and the display unit is used for displaying the parameter value of the element to be tested, which is finally calculated by the main control unit, and the input end of the display unit is connected with the main control unit.
STM32F407 series is selected as a singlechip of the main control unit, and the singlechip mainly completes LCD control, DDS chip control, ADC control and impedance calculation. STM32F407 series CPU maximum frequency 168MHz, high speed SPI and I2C may be connected to the main stream display unit. 3 ADCs with the speed of 2.4MSPS or 7.2MSPS, the sampling frequency meets the requirements of the low-frequency part of the system, and the sampling data cache is realized by combining with the general DMA so as to replace the ADC outside the chip.
As shown in fig. 2, the signal excitation unit specifically includes a signal generator, a low-pass filter, a power amplifier, and an output stage, the signal generator, the low-pass filter, the power amplifier, and the output stage are sequentially connected, an input end of the signal generator is connected with the main control unit, and the output stage is used for being connected with the valve section module circuit and providing an excitation signal with a certain voltage and frequency generated in the signal excitation unit.
The DDS chip selects AD9850, the chip is powered by a 3.3V or 5V power supply, and sine waves of 40MHZ at the maximum can be generated at the clock frequency of 125 MHz. The 8-bit parallel interface is capable of writing frequency and phase control words into it. The output quantity of the current of the output analog signal is adjusted by changing the DAC external resistor of the AD9850, so that the amplitude of the output signal is changed. The DDS output signal contains more low-frequency harmonics, an active filter is limited by the bandwidth of an operational amplifier and is difficult to meet the filtering requirement in a system frequency band, and a passive elliptic low-pass filter is generally used for removing noise. Passive filters have stringent impedance matching requirements, so impedance matching is a final consideration. In order to filter out the spurs to the maximum extent without affecting the original input signal, the transition band of the filter is narrow and the attenuation is fast, therefore, the system designs a passive 7 th order elliptic filter, and the circuit structure is shown in fig. 3.
The power amplifying circuit adopts a multi-stage scheme, the amplitude and the power of an AD9850 output signal are limited, and in order to be free from the influence of a post-stage circuit, an emitter follower is used for isolation, and amplification is carried out after filtering. The filtered signal is amplified using a TL1037 broadband operational amplifier. The TL1037 power supply mode has two types of power supply of double power supplies and power supply of single power supply, the bandwidth can reach 60MHZ, and the method is particularly suitable for conversion and transmission of high-frequency signals. In order to improve the output amplitude of the signal peak-to-peak value in the design, a +/-15V direct-current power supply is adopted as a chip power supply, so that a relatively high voltage amplitude can be obtained in a required bandwidth.
As for the signal sampling unit, simulation verification shows that when the frequency of an applied signal source is 10KHZ to 5MHZ, the bandwidth of a signal sampled by a single chip microcomputer is larger than 10K-5M, the sampling frequency of an ADC (analog to digital converter) carried by the single chip microcomputer can reach 2MHZ, the signal lower than 100KHZ can be directly sampled, and the signal can be restored according to a sampling theorem and discrete Fourier transform so as to obtain an expression of the measured signal to calculate the final impedance. However, when the signal frequency is higher than 100KHZ, the ADC has conversion time, so that the signal acquired by the method is inaccurate and has a large influence on the calculation result. If a high-speed ADC chip is selected, the sampling frequency is about 25M, and the ADC in the level is in parallel communication, so that the sampling result can be ensured to be obtained in real time. However, the speed of the IO port of the single chip microcomputer is limited, and the IO port serving as a parallel port cannot reach 25M, so that the data acquisition requirement cannot be met. To solve the speed problem, only FPGA or DSP can be used for data acquisition, but the cost and the complexity of the circuit are improved.
When the measurement scheme is demonstrated, the voltage and current effective values can be obtained by using the excitation signals with two groups of frequencies, and then the impedance is obtained by solving an equation set. Therefore, we only need to measure the effective value of the signal to calculate the impedance parameter. Meanwhile, the effective value and the amplitude of the sinusoidal signal can be converted, so that the impedance parameter can be calculated by measuring one of the effective value and the amplitude.
Through the analysis, the signal sampling system adopts a mode of combining a conversion method and a direct sampling valve, and is divided into two conditions according to the frequency of a sampling signal during measurement: when the voltage-sharing capacitor is tested, an external amplitude detection or effective value detection circuit is used for obtaining the amplitude or effective value of the voltage and the current; when other objects are measured, the ADC is adopted to directly sample the voltage and current signals, and a software method is utilized to restore and analyze the signals.
Specifically, as shown in fig. 1, the signal sampling unit includes a sampling resistor, an I-V conversion module, a buffer amplification module, a first multiplexer, a second multiplexer, an adder, and an effective value conversion module, the sampling resistor is connected to the valve segment module circuit, an input of the I-V conversion module is connected to the sampling resistor, an input of the buffer amplification module is connected to a component to be tested of the valve segment module circuit, output ends of the I-V conversion module and the buffer amplification module are both connected to an input end of the first multiplexer, an output end of the first multiplexer is connected to the adder and the effective value conversion module, output ends of the adder and the effective value conversion module are both connected to the second multiplexer, and are connected to the ADC of the main control unit through the second multiplexer. The second multiplexer is used for switching gears to ensure that the voltage value entering the main control unit is within a range of measurement.
As shown in fig. 4, the voltage acquisition schematic block diagram is shown, when the voltage ratio of the module to be measured is large, the attenuator is required to step down first, and if the voltage is small, the attenuator is required to amplify. The buffered amplified signals are converted by a multi-way switch selection adder or an effective value conversion module. Adding a direct current component to the voltage of the module through an adder with low frequency to enable all the signals to be positive values and enter the ADC; the high-frequency effective value entering conversion module converts the alternating current signal into a direct current effective value signal and enters the ADC.
As shown in fig. 5, which is a schematic diagram of current collection, in order to measure the current of the loop, the current is converted into a voltage signal by using I-V conversion, and since the impedance of the element to be measured is large, the current in the loop is small because the excitation design is simple and the excitation with large power is not designed. The transimpedance amplifier (TIA) is generally used for a high-speed circuit due to the advantage of high bandwidth, has small drift and high precision, is generally used as a current amplifier, is very suitable here, is very simple in circuit, and can select the amplification factor according to different modules.
The detection of the effective value of the signal by the effective value conversion module can be realized by an RMS-DC converter, and the chip can input a sinusoidal signal and output a direct current signal, which is the effective value of the sinusoidal signal, such as AD637 of ADI corporation. Or, a rectification method can be adopted, the signal to be detected is rectified and filtered, then enters an ADC (analog to digital converter) for sampling to obtain a direct current parameter, and then an effective value or an amplitude value is obtained through mathematical calculation.
As shown in fig. 6, a typical precision full-wave rectifier circuit operates on the principle of: n1 and peripheral circuits form a positive half-wave input 2-time voltage inverting rectification amplifying circuit, and N2 is an inverting summation circuit. If the peak value of the input signal is a sine wave signal voltage of +/-2V, outputting a voltage signal of-4V corresponding to the input positive half wave at the input point of the later stage; the signal is added to the input signal at the inverting input end of N1 to obtain a pulsating direct current of-2V (when a later stage circuit needs a positive sampling voltage) input signal, and then the input signal is added to the input signal by an inverting summation circuit of N2 to obtain a pulsating direct current of 2V. The circuit has the same function as a full-wave or bridge rectifier circuit, but the rectification linearity and precision are guaranteed;
as shown in fig. 7, the high input impedance full-wave rectifier circuit is a high input impedance (the input signal enters the non-inverting input terminals of N1 and N2, the input signal current is close to zero) full-wave rectifier circuit, during the input positive half-wave, D1 is on, D2 is off, and N2 (in this case, the voltage follower) sends the input positive half-wave to the Vo terminal; during the negative half-wave input period, D1 is off, D2 is on, N1 becomes a 2-time voltage-multiplying in-phase amplifier, the output signal voltage of the amplifier is sent to the Vi signal at the same time, the output signal voltage of the amplifier is sent to N2 (which becomes a subtracter), and the negative full-wave rectified voltage is output after subtraction.
The display unit is used for displaying the inductance of the anode reactor in the valve section module circuit, the impedance of the damping resistor, the capacitive reactance of the damping capacitor and the capacitance value of the voltage-sharing capacitor, and after the main control unit collects related current and voltage data by using the ADC port, the finally calculated parameter values are displayed through the display unit through internal calculation.
Specifically, when the measurement is carried out, the element to be measured in the valve section module circuit is connected between the signal excitation unit and the signal acquisition unit, then according to the type of the element to be tested, the signal excitation unit utilizes the design of the main control unit to provide a corresponding excitation signal with certain voltage and frequency to the valve section module circuit, then the voltage signal of the tested element is obtained by the signal acquisition unit through the buffer amplifying circuit, the voltage signal on the sampling resistor is obtained by the other path of the voltage signal through the I-V conversion module, the two paths of signals are switched by the first multi-path selector, directly enters the single chip microcomputer ADC or enters the effective value conversion module and then enters the single chip microcomputer according to the selection of the element to be measured, and calculating the vector voltage or the effective value of the measured value through the single chip microcomputer, finally calculating the impedance value of the element to be measured according to the measurement scheme, and displaying the measurement result through an LCD (liquid crystal display).
The measurement of the thyristor level and the grading capacitor of the converter valve is taken as an example for explanation.
The converter valve thyristor level is measured without disconnecting the line:
applying two alternating current signals with different frequencies at two ends of a thyristor level, and obtaining the amplitude or effective value of current in a circuit through a sampling resistor (an adder is used when the current amplitude or effective value is measured, an ADC is adopted to directly sample a voltage current signal, and a software method is utilized to restore and analyze the signal); then, performing equivalence by using a circuit rule to simplify a circuit; finally, through impedance calculation, an analytic solution of the damping resistor and the damping capacitor can be obtained.
The specific impedance calculation principle is as follows:
in the formula, RCIs a sampling resistor; r is a damping loop resistor; c is a damping loop capacitor; u shapemIs the excitation voltage amplitude; i is1mIs the amplitude is UmFrequency is f1The current amplitude on the sampling resistor of the excitation signal; i is2mIs the amplitude is UmFrequency is f2The excitation signal of (2) down samples the current amplitude on the resistor.
By modifying the above formula, one can obtain:
in the formula: omega1Is f1A corresponding angular frequency; omega2Is f2Corresponding angular frequency.
And finally, the calculated values of the damping resistor and the damping capacitor are controlled and displayed on the display unit through the main control unit.
The voltage-sharing capacitor of the converter valve is measured without disconnecting the line:
applying two high-frequency alternating voltage excitation signals with different frequencies which are not less than 1MHz at two ends of the valve section, and obtaining the amplitude or effective value of current in the circuit through a sampling resistor (an effective value conversion module is used when the current amplitude or effective value is measured, and the amplitude or effective value of voltage and current is obtained through an external amplitude detection or effective value detection circuit); then, performing equivalence by using a circuit rule to simplify a circuit; finally, through impedance transformation, an analytic solution of the voltage-sharing capacitor can be obtained.
The calculation formula of the total impedance of the circuit is as follows:
in the formula: zGeneral assemblyIs the total impedance of the circuit; rcIs a sampling resistor; n is the number of valve sections connected in series; r is the resistance of the RPU plate; y is the capacitance reactance of the voltage-sharing capacitor, and y is-1/(omega C)G) ω is the angular frequency corresponding to f, CGIs a voltage-sharing capacitor.
Substituting and simplifying the formula:
in the formula: r is the resistance of the RPU plate, CGIs a voltage-sharing capacitor, UmFor the amplitude of the excitation voltage, ImIs an amplitude of UmAmplitude, omega, of the current in the sampling resistor for an excitation signal of frequency f1Is f1Corresponding angular frequency, ω2Is f2And the corresponding angular frequency n is the number of the valve sections connected in series.
The voltage-sharing capacitance C obtained by calculationGThe value of (b) is controlled and displayed on the display unit through the main control unit.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (9)
1. A valve section modular element impedance measurement system, characterized by: the device comprises a main control unit, a signal excitation unit, a signal sampling unit and a display unit;
the signal excitation unit is used for generating and providing an excitation signal with certain voltage and frequency to the valve section module circuit, the input end of the signal excitation unit is connected with the main control unit, and the output end of the signal excitation unit is used for being connected with the valve section module circuit;
the signal sampling unit is used for collecting a voltage signal and a current value of an element to be detected in the valve section module circuit, the output end of the signal sampling unit is connected with the main control unit, and the input end of the signal sampling unit is used for being connected with the valve section module circuit;
the main control unit is a single chip microcomputer and is used for controlling the voltage amplitude and the frequency of an excitation signal provided by the signal excitation unit and obtaining the impedance value of the element to be tested through calculation according to the current value in the valve section module circuit collected by the signal sampling unit;
and the display unit is used for displaying the parameter value of the element to be tested, which is finally calculated by the main control unit, and the input end of the display unit is connected with the main control unit.
2. The valve section modular element impedance measurement system of claim 1, wherein: the signal excitation unit comprises a signal generator, a low-pass filter, a power amplifier and an output stage, the signal generator, the low-pass filter, the power amplifier and the output stage are sequentially connected, the input end of the signal generator is connected with the main control unit, and the output stage is used for being connected with the valve section module circuit and providing excitation signals with certain voltage and frequency generated in the signal excitation unit.
3. The valve section modular element impedance measurement system of claim 2, wherein: the low-pass filter is a 7 th order elliptic filter.
4. The valve section modular element impedance measurement system of claim 1, wherein: the signal sampling unit includes sampling resistor, I-V conversion module, buffering amplifier module, first multiplexer and effective value conversion module, sampling resistor and valve block module circuit connection, I-V conversion module's input and sampling resistor are connected, the input of buffering amplifier module is connected with the component that awaits measuring of valve block module circuit, I-V conversion module and the output of buffering amplifier module all are connected with the input of first multiplexer, the output of first multiplexer is connected with the input of effective value conversion module, the output of effective value conversion module is connected with the ADC port of main control unit.
5. The valve section modular element impedance measurement system of claim 4, wherein: the output end of the first multiplexer is further connected with an adder, and the output end of the adder is connected with an ADC port of the main control unit.
6. The valve section modular element impedance measurement system of claim 5, wherein: and a second multiplexer is connected between the adder, the effective value conversion module and the ADC of the main control unit.
7. The valve section modular element impedance measurement system of claim 5, wherein: when the signal sampling unit detects the voltage-sharing capacitor, an external amplitude detection or effective value detection circuit is used for obtaining the amplitude or effective value of the voltage and the current; when other objects are measured, the ADC is adopted to directly sample the voltage and current signals, and a software method is utilized to restore and analyze the signals.
8. The valve section modular element impedance measurement system of claim 4, wherein: the I-V conversion module is a trans-impedance amplifier.
9. The valve section modular element impedance measurement system of claim 1, wherein: and the display unit is used for displaying the inductance of the anode reactor in the valve section module circuit, the impedance of the damping resistor, the capacitive reactance of the damping capacitor and the capacitance value of the voltage-sharing capacitor.
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| CN104808070A (en) * | 2015-04-23 | 2015-07-29 | 许继集团有限公司 | Converter valve thyristor level damping loop parameter testing device and method |
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| CN109901039A (en) * | 2019-03-29 | 2019-06-18 | 国网上海市电力公司 | A kind of converter valve thyristor presses component test set and method |
| CN109917264A (en) * | 2019-03-29 | 2019-06-21 | 国网上海市电力公司 | A kind of converter valve thyristor level short-circuit test device and method |
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2020
- 2020-09-14 CN CN202010962868.5A patent/CN112269061A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808070A (en) * | 2015-04-23 | 2015-07-29 | 许继集团有限公司 | Converter valve thyristor level damping loop parameter testing device and method |
| CN105319445A (en) * | 2015-12-08 | 2016-02-10 | 北京航空航天大学 | Impedance measurement device and method based on random demodulator |
| CN107202947A (en) * | 2017-05-26 | 2017-09-26 | 国网四川省电力公司电力科学研究院 | A kind of efficient thyristor valves component test system and method for testing |
| CN109901039A (en) * | 2019-03-29 | 2019-06-18 | 国网上海市电力公司 | A kind of converter valve thyristor presses component test set and method |
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