WO2012071774A1 - 一种高压直流输电换流阀合成试验方法 - Google Patents

一种高压直流输电换流阀合成试验方法 Download PDF

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Publication number
WO2012071774A1
WO2012071774A1 PCT/CN2011/001002 CN2011001002W WO2012071774A1 WO 2012071774 A1 WO2012071774 A1 WO 2012071774A1 CN 2011001002 W CN2011001002 W CN 2011001002W WO 2012071774 A1 WO2012071774 A1 WO 2012071774A1
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valve
test
high voltage
voltage
current
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French (fr)
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查鲲鹏
杨俊�
高冲
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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Priority to US13/255,507 priority Critical patent/US20120326727A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor
    • G01R31/2637—Circuits therefor for testing other individual devices

Definitions

  • the invention relates to the field of power electronics and power system simulation test, and particularly relates to a test method for a direct current transmission converter valve, in particular to a test method for synthesizing a high voltage direct current transmission converter valve. Background technique
  • the converter valve should be designed to ensure that the DC converter valve is in various Safe and correct operation under steady-state, transient operating conditions. Since the DC transmission converter valve has the characteristics of high working voltage, large current and large capacity, it is difficult to construct a full-load circuit with the same actual operating conditions in the test environment, so how to construct an equivalent test in the test environment The circuit, which is equivalent to the strength of the actual operating conditions, becomes the key to solving the problem.
  • the test method of DC converter valve is generally used in the synthetic test method.
  • the basic idea is to use two sets of power supply systems to provide long-term running current and high voltage intensity for the DC converter valve, a large current source for the running current of the sample, and a high voltage source for the high voltage strength of the sample.
  • the current output from the large current source and the voltage output from the high voltage source are alternately applied to the tested converter valve according to the power frequency to compare the current, voltage and thermal stress experienced by the equivalent sample in actual operation.
  • the existing high-voltage source of the synthetic test circuit consists of an oscillating circuit. The distinguishing feature is that the high voltage provided is positive and negative symmetrical, and the forward and reverse voltages of the converter valve in actual operation are not positive or negative. Symmetry, although the test can meet the general engineering requirements, but its equivalence is not reasonable*
  • the object of the present invention is to provide a test method for synthesizing a high-voltage direct current transmission converter valve, which adopts two sets of high-voltage power sources to provide positive and negative high voltages during the blocking period for the test ceramics, and the direct current large current source provides conduction for the test valves.
  • high DC current high voltage and DC current are alternately applied to the test valve at a power frequency through a certain trigger timing to reproduce the current of the test valve under various steady-state and transient conditions. , voltage, thermal stress, flexible test method, comprehensive function, and good equivalence.
  • test method for synthesizing a high-voltage direct current transmission converter valve the improvement being: the test device for the method A test device for synthesizing a DC transmission converter valve, the test device comprising a sample valve Vt, a low-voltage high-current DC power source 1 and two high-voltage sources, the two high-voltage sources being a high-voltage source 2 and a high-voltage source 3, the high voltage Source 2 and high voltage source 3 are connected in parallel.
  • the low-voltage high-current DC power source 1 is connected in parallel with the sample valve Vt
  • the high-voltage source 2 includes an auxiliary valve VI, a charging device S1, a resonant inductor L1, and a resonant capacitor C1.
  • the charging device S1 and the resonant capacitor C1 are connected in series with the resonant inductor L1 and the auxiliary wide VI.
  • the high voltage source 3 includes an auxiliary valve V2, a charging device S2, a resonant inductor L2 and a resonant capacitor C2.
  • the charging device S2 and the resonant capacitor C2 are connected in parallel.
  • the high voltage sources 2 and 3 are connected in parallel with the sample valve Vt.
  • the method includes the following steps:
  • the high voltage source charges the resonant capacitor and simultaneously turns on the low voltage and large current DC power supply;
  • the high voltage sources 2 and 3 respectively charge the resonant capacitors C1 and C2 to generate a forward and reverse voltage, and simultaneously turn on the low voltage large current DC power source 1 to generate a large direct current;
  • the test enters the synthesis stage, and the test valve Vt and the auxiliary valve VI and the auxiliary valve V2 are opened according to the command of the control system;
  • the resonant current of the high voltage source 2 or 3 flows through the sample valve Vt, and the direct current of the low voltage large current DC power source 1 flows through the sample valve Vt, so that the sample valve Vt receives a large current during the conduction period and High voltage during blocking.
  • the two independent high voltage sources 2 and 3 provide positive and negative high voltage asymmetry during the blocking period provided by the test valve Vt.
  • the DC converter valve synthesis test method provided by the invention is divided into two forward high voltage sources to provide a forward and reverse high voltage during the blocking period of the test valve, and an asymmetric blocking voltage can be obtained, so that the test sample can withstand The voltage is closer to the actual running waveform and the test results are better.
  • Test method By changing the control sequence, a variety of voltage combinations can be realized. The combination can be flexibly selected according to different test items and test product design features. The test plan has a large choice, flexible mode and wide application range.
  • Figure 1 Schematic diagram of the high-voltage direct current transmission converter valve synthesis test device
  • Figure 2 Synthetic test method Voltage and current waveform of the test valve in double injection mode
  • FIG. 1 Synthetic test method Three-injection mode voltage and current waveform of the test valve. detailed description:
  • the high voltage source 2 includes an auxiliary valve VI, a charging device S1, a resonant inductor L1 and a resonant capacitor C1; the charging device S1 and the resonant capacitor C1 are connected in series with the resonant inductor L1 and the auxiliary valve VI in series; the high voltage source 3 includes an auxiliary valve V2, a charging device S2, the resonant inductor L2 and the resonant capacitor C2, the charging device S2 and the resonant capacitor C2 are connected in parallel with the resonant inductor L2 and the auxiliary valve V2 in series; the high voltage sources 2 and 3 are connected in parallel and then in the sample, the wide Vt is connected in parallel;
  • the test method uses the following steps:
  • the high voltage sources 2 and 3 respectively charge the resonant capacitors C1 and C2 to generate forward and reverse voltages, and the low voltage and large current DC power supplies 1 generate a large DC current; the test enters the synthesis stage, the auxiliary valve VI and the auxiliary valve V2 in the circuit and the test
  • the valve Vt is turned on according to the command of the control system according to a certain periodic trigger timing; the resonant current of the high voltage source 2 or 3 flows through the sample valve Vt, and the direct current of the low voltage large current DC power source 1 flows through the sample valve Vt, the sample
  • the valve Vt is subjected to a large current during the on period and a high voltage during the blocking period.
  • the independent high-voltage sources 2 and 3 respectively charge the resonant capacitors C1 and C2 and generate positive and negative high voltages respectively, provide the forward trigger voltage required for the test sample Vt and the reverse recovery voltage after the sample valve is turned off, and test
  • the voltage jump and forward voltage rise rate during the Vt blocking of the valve can accurately check the correctness of the design of the Vt energy-carrying unit of the test valve; at the same time, the high-voltage source 2 and 3 are introduced before the low-voltage high-current DC power supply 1 is extinguished.
  • Resonant current the current change rate before the equivalent test valve Vt is turned off;
  • Low-voltage high-current DC source 1 injects DC current during the test valve Vt conduction, so that the correct equivalent test valve Vt conducts current peak value , reproduce the loss during the test valve Vt conduction; within a few hundred microseconds before the high-voltage source current cuts off, the low-voltage high-current DC source 1 current 3 ⁇ 4: zero and is isolated, while ensuring the safety of the auxiliary valves VI and V2 Shutdown; the auxiliary valves VI and V2 in the circuit and the test valve Vt are turned on according to the command of the control system according to a certain periodic starting sequence, so that the high current during the conduction period and the high period during the blocking period are high.
  • Independent high-voltage sources 2 and 3 provide positive and negative high-voltage asymmetry for the test valve Vt, and high-voltage sources 2 and 3 can generate more voltage waveforms through reasonable timing.
  • Figure 2 shows the voltage and current period (20ms) waveforms of the sample valve in the double injection mode of the synthetic test method.
  • the test valve Vt is subjected to the forward high voltage of the high voltage source 2;
  • the test valve Vt and the auxiliary wide VI are opened, the resonant current in the high voltage source 2 flows through the sample valve Vt; the direct current in the direct current large current source 1 is introduced at the time t2, and the test valve Vt is subjected to the direct current during the conduction period.
  • Current t3 moment DC current is turned off before the auxiliary wide V2, the high voltage source 3 in the resonant current flows through the sample valve Vt; t4 at the high voltage source 3 in the resonant current is extinguished, triggering the auxiliary valve V2 to make the test valve Vt off Withstand the reverse high voltage of voltage source 3;
  • the charging device S2 is controlled at time t5 to charge the high voltage source 3;
  • the t6 controls the charging device S1 to charge the high voltage source 2, and triggers the auxiliary valve VI with a wide pulse, so that when the charging is completed, the sample valve Vt is subjected to the high voltage of the high voltage source 2, and the test circuit prepares for the next test cycle.
  • the basic working principle of the circuit of the invention in the three injection working mode - Fig. 3 is the voltage and current period (20ms) waveform of the sample valve in the three injection mode of the synthetic test method.
  • test valve Vt is subjected to the high voltage of the high voltage source 2;
  • the test valve Vt and the auxiliary valve VI are opened, the resonant current in the high voltage source 2 flows through the sample valve Vt; the direct current in the direct current large current source 1 is introduced at the time t2, and the test valve Vt is subjected to the direct current during the conduction period.
  • Current; t3 time charging device S1 charges the resonant capacitor C1 in the high voltage source 2, and restores its voltage to the voltage level at time t0;
  • the auxiliary valve V2 is turned on before the DC current is extinguished at the time t4, and the resonant current flows through the sample valve in the high voltage source 3; the resonant current is extinguished in the high voltage source 3 at the time t5, and the auxiliary valve V2 is triggered to make the test valve Vt turn off and withstand the voltage source Reverse high pressure of 3;
  • the charging device S2 is charged for the high voltage source 3, and the auxiliary valve V2 is applied with a wide trigger pulse;
  • the resonant capacitor C2 of the high voltage source 3 is charged, the sample valve Vt is subjected to its forward high voltage;
  • the test valve Vt and the auxiliary valve VI the resonant current in the high voltage source 2 flows through the sample valve again;
  • the charging device S1 charges the resonant capacitor C1 of the high voltage source 2, and the test circuit enters the next duty cycle after the charging is completed.
  • the method provided by the invention uses two independent high-voltage sources to provide the positive and negative high voltages during the blocking period for the test valve. Since the two high-voltage sources are independent of each other, the positive and negative asymmetric high voltages can be supplied to the test valve. The voltage stress of the test valve in the test is close to the voltage stress in the actual operating conditions, the test equivalence is better, and the two high-voltage sources can generate more kinds of voltage waveforms through reasonable timing matching, which can be The needs of the test project and the design features of the test valve are flexibly selected in combination, and the test plan has a large choice and flexible method.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Dc-Dc Converters (AREA)

Description

一种高压直流输电换流阀合成试验方法 技术领域
本发明涉及电力电子和电力系统模拟试验领域， 具体讲涉及一种直流输电换流阀试 验方法， 尤其涉及一种高压直流输电换流阀合成试验方法。 背景技术
随着直流输电电压、 输送容量的提高， 直流输电系统的关键设备——直流换流阀 的运行可靠性对系统安全运行至关重要， 换流阀在设计时应保证直流换流阀在各种稳 态、 暂态运行条件下安全、 正确运行。 由于直流输电换流阀具有工作电压高、 电流大、 容量大的特点， 很难在试验环境中构建同实际运行工况相同的全载电路进行试验， 因此 如何在试验环境中构建等效的试验电路，进行与实际运行工况强度相当的试验成为解决 问题的关键。
限于试验容量的提供， 目前普遍采用合成试验的方法进行直流换流阀的运行试验。 其基本思想是采用两套电源系统分别为直流换流阀提供长时运行电流、 高电压强度， 为 试品提供运行电流的为大电流源， 为试品提供高电压强度的为高电压源， 试验时将大电 流源输出的电流和高电压源输出的电压按照工频交替施加于被试换流阀上， 以等效试品 在实际运行中所承受的电流、 电压、 热应力。 不过， 现有的合成试验电路其高电压源均 由振荡回路组成， 其显著特点是所提供的高电压为正负对称， 而换流阀在实际运行中所 承受的正反向电压并非正负对称， 试验虽能满足一般工程要求， 但是其等效性却不尽理 *巨 发明内容
本发明的目的是提供一种高压直流输电换流阀合成试验方法， 该方法采用两套高 压电源为试品陶提供阻断期间的正反向高压，直流大电流源为试品阀提供导通期间的直 流大电流， 通过一定的触发时序使得高电压和直流大电流以工频交替施加于试品阀上， 以复现试品阀在实际运行各种稳态、暂态工况下的电流、 电压、热应力，试验方式灵活、 功能全面、 等效性好。
为了实现以上目的， 本发明采用以下技术方案予以实现：
一种高压直流输电换流阀合成试验方法， 其改进之处在于： 所述方法用的试验装置 为直流输电换流阀合成试验装置， 所述试验装置包括试品阀 Vt、低压大电流直流电源 1 和两个高压源，所述两个高压源为高压源 2和高压源 3，所述高压源 2和高压源 3并联。
本发明提供的一种优选技术方案中： 所述低压大电流直流电源 1与试品阀 Vt并联， 所述高压源 2包括辅助阀 VI、 充电装置 Sl、 谐振电感 L1和谐振电容 Cl， 所述充电装 置 S1和谐振电容 C1并联后与谐振电感 L1和辅助阔 VI串联，高压源 3包括辅助阀 V2、 充电装置 S2、 谐振电感 L2和谐振电容 C2; 所述充电装置 S2和谐振电容 C2并联后与 谐振电感 L2和辅助阀 V2串联， 所述高压源 2和 3与试品阀 Vt并联。
本发明提供的第二种优选技术方案中： 所述方法包括下述步骤：
A、 高压源为谐振电容充电， 同时开通低压大电流直流电源；
B、 依据控制系统的命令开通试品阀和辅助阀；
C、 让试品阀承受导通期间的大电流以及阻断期间的高电压。
本发明提供的第三种优选技术方案中：所述步骤 A中， 高压源 2和 3分别为谐振电 容 C1和 C2充电产生正反向电压， 同时开通低压大电流直流电源 1产生直流大电流； 所述步骤 B中， 试验进入合成阶段， 依据控制系统的命令开通试品阀 Vt以及辅助 阀 VI和辅助阀 V2;
所述步骤 C中， 高压源 2或 3的谐振电流流经试品阀 Vt， 低压大电流直流电源 1 的直流电流流经试品阀 Vt，让试品阀 Vt承受导通期间的大电流以及阻断期间的高电压。
本发明提供的第四种优选技术方案中： 所述两个独立的高电压源 2和 3 为试品阀 Vt提供的阻断期间正反向高压不对称。
与现有技术相比， 本发明达到的有益效果在于：
本发明提供的直流换流阀合成试验方法通过两个独立的高电压源分为为试品阀 提供阻断期间的正反向高压， 可以获得不对称的阻断电压， 使得试品所承受的电压更接 近实际运行波形， 试验效果更好。
2、 试验方法通过改变控制时序， 可以实现多种电压组合， 可以按照不同试验项目 及试品设计特点灵活选择组合方式， 试验方案选择余地较大、 方式灵活， 适用范围广。 附图说明：
图 1 高压直流输电换流阀合成试验装置原理图；
图 2 合成试验方法双注入模式下试品阀的电压、 电流波形；
图 3 合成试验方法三注入模式下试品阀的电压、 电流波形。 具体实施方式：
下面结合附图对本发明具体实施方式作进一步的详细说明。
图 1是高压直流输电换流阀合成试验装置原理图，该装置包括试品阔 vt、低压大电 流直流电源 1、 高压源 2、 高压源 3; 低压大电流直流电源 1与试品阀 Vt并联； 高压源 2包括辅助阀 VI、 充电装置 Sl、 谐振电感 L1和谐振电容 C1 ; 充电装置 S1和谐振电容 C1并联后与谐振电感 L1和辅助阀 VI串联； 高压源 3包括辅助阀 V2、 充电装置 S2、 谐振电感 L2和谐振电容 C2， 充电装置 S2和谐振电容 C2并联后与谐振电感 L2和辅助 阀 V2串联； 高压源 2和 3并联后再于试品,阔 Vt并联。
试验方法采用下述步骤：
高压源 2和 3分别为谐振电容 C1和 C2充电产生正反向电压， 同时低压大电流直 流电源 1上电产生直流大电流； 试验进入合成阶段， 电路中的辅助阀 VI和辅助阀 V2 以及试品阀 Vt依据控制系统的命令按照一定的周期性触发时序开通； 高压源 2或 3的 谐振电流流经试品阀 Vt， 低压大电流直流电源 1的直流电流流经试品阀 Vt， 试品阀 Vt 承受导通期间的大电流以及阻断期间的高电压。
独立的高压源 2和 3分别谐振电容 C1和 C2充电并分别产生正反向高电压， 提供 试品阔 Vt所需的正向触发电压和试品阀关断后的反向恢复电压， 以及试品阀 Vt阻断期 间的电压跃变和正向电压上升率， 可以准确考核试品阀 Vt取能单元设计的正确性； 同 时通过在低压大电流直流电源 1熄灭前引入高电压源 2和 3的谐振电流，来等效试品阀 Vt关断前的电流变化率； 低压大电流直流源 1在试品阀 Vt导通期间注入直流电流， 从 而正确的等效试品阀 Vt导通电流的峰值， 复现试品阀 Vt导通期间的损耗； 在高压源电 流截止前的几百微妙内， 低压大电流直流源 1的电流 ¾：零并且被隔离， 同时确保辅助阀 VI和 V2的安全可靠关断；电路中的辅助阀 VI和 V2以及试品阀 Vt依据控制系统的命 令按照一定的周期性出发时序开通， 使得承受导通期间的大电流以及阻断期间的高电 压； 独立的高压源 2和 3为试品阀 Vt提供的正负高电压不对称， 高压源 2和 3通过合 理时序搭配可以产生更多种电压波形。
下面通过实施例来进一步说明本发明电路的两种基本工作模式下试品阀电压、 电流 的周期波形。
实施例 1
高压直流输电换流阀合成试验中， 在双注入工作模式下本发明方法的基本工作原 理：
图 2是合成试验方法双注入模式下试品阀的电压、 电流周期（20ms)波形。 t0时刻试品阀 Vt承受高电压源 2的正向高压；
tl时刻开通试品阀 Vt和辅助阔 VI， 高电压源 2中的谐振电流流经试品阀 Vt; t2时刻引入直流大电流源 1中的直流电流， 试品阀 Vt承受导通期间的直流电流； t3时刻直流电流熄灭前开通辅助阔 V2, 高电压源 3中谐振电流流经试品阀 Vt; t4时刻高电压源 3中谐振电流熄灭，触发辅助阀 V2使得试品阀 Vt关断后承受电压 源 3的反向高压；
t5时刻控制充电装置 S2为高电压源 3充电；
t6时刻控制充电装置 S1为高电压源 2充电， 以宽脉冲触发辅助阀 VI， 使得充电结 束时， 试品阀 Vt承受高电压源 2的正向高压， 试验电路为下一个试验周期做准备。
实施例 2
高压直流输电换流阀合成试验中，在三注入工作模式下本发明电路的基本工作原理- 图 3是合成试验方法三注入模式下试品阀的电压、 电流周期（20ms)波形。
t0时刻试品阀 Vt承受高电压源 2的正向高压；
tl时刻开通试品阀 Vt和辅助阀 VI， 高电压源 2中的谐振电流流经试品阀 Vt; t2时刻引入直流大电流源 1中的直流电流， 试品阀 Vt承受导通期间的直流电流； t3时刻充电装置 S1为高电压源 2中的谐振电容 C1充电， 使其电压恢复至 t0时刻 电压水平；
t4时刻直流电流熄灭前开通辅助阀 V2， 高电压源 3中谐振电流流经试品阀； t5时刻高电压源 3中谐振电流熄灭，触发辅助阀 V2使得试品阀 Vt关断后承受电压 源 3的反向高压；
t6时刻控制充电装置 S2为高电压源 3充电， 同时给辅助阀 V2施以宽触发脉冲； t7时刻高电压源 3中谐振电容 C2充电完毕， 试品阀 Vt承受其正向高压； t8时刻开通试品阀 Vt和辅助阀 VI， 高电压源 2中的谐振电流再次流经试品阀； t9时刻谐振电流过零， 开通辅助阀 VI， 试品阀 Vt将承受反向电压；
tlO时刻， 充电装置 S1为高电压源 2中谐振电容 C1充电， 充电结束后试验电路进 入下一个工作周期。
本发明提供的方法改用两个独立的高压源为试品阀提供阻断期间的正反向高压， 由 于两个高压源相互独立， 因此可以向试品阀提供正负不对称的高电压， 使得试品阀在试 验中所受电压应力与实际运行工况中所承受电压应力接近一致， 试验等效性更好， 而且 两个高压源通过合理时序搭配可以产生更多种电压波形，可以根据试验项目的需要及试 品阀的设计特点灵活选取其组合方式， 试验方案选择余地较大， 方法灵活。 最后应该说明的是： 结合上述实施例说明本发明的技术方案而非对其限制。 所属领 域的普通技术人员应当理解到：本领域技术人员可以对本发明的具体实施方式进行修改 或者等同替换， 但这些修改或变更均在申请待批的权利要求保护范围之中。

Claims

权 利 要 求
1、 一种高压直流输电换流阀合成试验方法， 其特征在于： 所述方法用的试验装置 为直流输电换流阔合成试验装置，所述试验装置包括试品阀 Vt、低压大电流直流电源（ 1 ) 和两个高压源， 所述两个高压源为高压源（2)和高压源（3)， 所述高压源（2 )和高压 源 （3) 并联。
2、 如权利要求 1所述的一种高压直流换流阀合成试验方法， 其特征在于： 所述低 压大电流直流电源（1 )与试品阀 Vt并联， 所述高压源（2)包括辅助阀 VI、 充电装置 Sl、 谐振电感 L1和谐振电容 Cl， 所述充电装置 S1和谐振电容 C1并联后与谐振电感 L1和辅助阀 VI串联， 高压源（3 )包括辅助阔 V2、 充电装置 S2、 谐振电感 L2和谐振 电容 C2; 所述充电装置 S2和谐振电容 C2并联后与谐振电感 L2和辅助阀 V2串联， 所 述高压源 （2)和 （3 ) 与试品阀 Vt并联。
3、 如权利要求 1所述的一种高压直流输电换流阀合成试验方法， 其特征在于： 所 述方法包括下述步骤：
A、 高压源为谐振电容充电， 同时开通低压大电流直流电源；
B、 依据控制系统的命令开通试品阀和辅助阀；
C、 让试品阀承受导通期间的大电流以及阻断期间的高电压。
4、 如权利要求 1所述的一种高压直流换流阀合成试验方法， 其特征在于： 所述步骤 A中， 高压源 （2)和 （3 )分别为谐振电容 C1和 C2充电产生正反向电 压， 同时开通低压大电流直流电源 （1 ) 产生直流大电流；
所述步骤 B中， 试验进入合成阶段， 依据控制系统的命令开通试品阀 Vt以及辅助 阀 VI和辅助阀 V2;
所述步骤 C中， 高压源 （2) 或（3 ) 的谐振电流流经试品阀 Vt， 低压大电流直流 电源（1 )的直流电流流经试品阀 Vt， 让试品阀 Vt承受导通期间的大电流以及阻断期间 的高电压。
5、 如权利要求 1所述的一种高压直流输电换流阀合成试验方法， 其特征在于： 所 述两个独立的高电压源 （2)和 （3 ) 为试品阔 Vt提供的阻断期间正反向高压不对称。
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