WO2014075614A1 - Thyristor-device-based mmc converter valve submodule device and control method thereof - Google Patents

Thyristor-device-based mmc converter valve submodule device and control method thereof Download PDF

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Publication number
WO2014075614A1
WO2014075614A1 PCT/CN2013/087110 CN2013087110W WO2014075614A1 WO 2014075614 A1 WO2014075614 A1 WO 2014075614A1 CN 2013087110 W CN2013087110 W CN 2013087110W WO 2014075614 A1 WO2014075614 A1 WO 2014075614A1
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Prior art keywords
thyristor
capacitor
voltage
current
diode
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PCT/CN2013/087110
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French (fr)
Chinese (zh)
Inventor
温家良
王秀环
郭高朋
吴婧
王宇
杨杰
药韬
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国家电网公司
国网智能电网研究院
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Publication of WO2014075614A1 publication Critical patent/WO2014075614A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

Definitions

  • MMC converter valve sub-module device based on thyristor device and control method thereof
  • the invention relates to the field of power system and power electronics, in particular to a MMC converter valve sub-module device based on a thyristor device and a control method thereof, in particular to a MMC converter valve sub-module topology structure device based on a thyristor device and control thereof method.
  • VSC voltage source control
  • MMC modular multi-level
  • the structure of the sub-module is very important for the performance and control complexity of the VSC converter valve.
  • the sub-module structure currently used is shown in Figure 1.
  • the two-IGBT structure consists of two IGBT devices and one capacitor, by controlling the turn-on and turn-on of the IGBT device. Turn off the output voltage.
  • IGBT devices Compared with thyristor devices, IGBT devices have large switching losses and complicated control. The rated voltage and current of a single device are low. As the voltage level increases, the number of sub-modules in series increases, and the balance between sub-modules is difficult. It is not conducive to the development of the converter valve to high pressure and large capacity. Summary of the invention
  • the present invention provides an MMC converter valve sub-module device based on a thyristor device and a control method thereof, and the MMC converter valve sub-module structure based on the thyristor device uses a thyristor device instead of the IGBT device, thereby reducing The switching loss of the device reduces the control complexity and improves the conversion efficiency of the sub-module.
  • a thyristor-based MMC converter valve sub-module device is improved in that the device includes a main circuit and a forced commutation circuit connected in parallel with both ends thereof; the main circuit includes a thyristor unit I, a thyristor unit, and Capacitor C; the thyristor unit I and the thyristor unit II are each composed of a thyristor and a diode connected in anti-parallel thereto.
  • the thyristor unit I is connected in parallel with the thyristor unit ⁇ ; the capacitor C is connected between the thyristor unit I and the thyristor unit ⁇ .
  • the thyristor unit 1 includes a thyristor T1 and a diode D1 connected in anti-parallel thereto; the cathode of the thyristor T1, the anode of the diode D1, the cathode of the diode D1, and the anode of the thyristor T1 are sequentially connected to form a closed loop I; the thyristor The unit ⁇ includes a thyristor ⁇ 2 and a diode D2 connected in anti-parallel thereto; the cathode of the thyristor ⁇ 2, the anode connection of the diode D2, the cathode of the diode D2, and the anode of the thyristor ⁇ 2 are sequentially connected to form a closed loop II.
  • the number of the forced commutation circuits is 2; one of the forced commutation circuits includes thyristors ⁇ 3 and ⁇ 5, the inductor L1 and the capacitor C1; the inductor L1 and the capacitor C1 are connected in series to form an L1-C1 branch; the thyristor ⁇ 5 is connected in parallel with the L1-C1 branch; thyristor ⁇ 3 is connected between the L1-C1 branch and the thyristor unit I;
  • Another forced commutation circuit includes thyristors ⁇ 4 and ⁇ 6, an inductor L2 and a capacitor C2; the inductor L2 and the capacitor C2 are connected in series to form an L2-C2 branch; the thyristor ⁇ 6 is connected in parallel with the L2-C2 branch; the thyristor ⁇ 4 is connected to the L2 - between the C2 branch and the thyristor unit II.
  • the present invention is based on another object of the present invention to provide a control method for a thyristor-based MMC converter valve sub-module device, the improvement comprising the steps of:
  • the submodule operates and outputs a voltage.
  • precharging the capacitor C1 and the capacitor C2 in the two forced commutation circuits respectively comprises the following steps:
  • capacitor C charges capacitor C1, until voltage U C1 across capacitor C1 is greater than or equal to the voltage value of capacitor C, the thyristors T3 and T2 are turned off;
  • Trigger thyristor T5 capacitor C1 forms an oscillating circuit along the inductor L1-thyristor ⁇ 5, so that the voltage on the capacitor C1 is reversed.
  • the oscillating current is zero, the voltage of the capacitor C1 is -U C1 , and the thyristor T5 is turned off;
  • Trigger thyristor T6 capacitor C2 forms an oscillating circuit along thyristor -6-inductor L2, so that the voltage on capacitor C2 is reversed.
  • the oscillating current is zero, the voltage of capacitor C2 is -U C2 , the thyristor T6 Shut down.
  • the sub-module working and outputting the voltage includes the following steps: 1. When the current I is positive, the thyristor T1 is triggered, the thyristor ⁇ 2 is turned off, and the thyristor T1 flows current as a current. I, the output voltage is zero;
  • the capacitor C1 forms an oscillating circuit along the diode D1-thyristor ⁇ 3-inductor L1, so that the current flowing through the thyristor T1 is zero, the thyristor T1 is turned off, and when the oscillating current crosses zero, the thyristor ⁇ 3 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C1 is +U C1 , the current I is transferred to the capacitor C-diode D2 loop, and the output voltage is the voltage Uc of the capacitor C ;
  • Trigger thyristor T5 capacitor C1 oscillates along the loop of inductor L1-thyristor ⁇ 5, so that the voltage of capacitor C1 is reversed.
  • the oscillating current is zero, the voltage on capacitor C1 is -U C1 , which is ready for forced commutation of the next thyristor T1;
  • the capacitor C2 forms an oscillating circuit along the inductor L2-thyristor ⁇ 4-diode D2, so that the current flowing through the thyristor ⁇ 2 is zero, and the thyristor ⁇ 2 is turned off.
  • the thyristor ⁇ 4 is turned off due to
  • the current I supplements the oscillation circuit loss
  • the voltage of the capacitor C2 is +U C2
  • the current I is transferred to the circuit of the diode D1, and the output voltage is zero;
  • Trigger thyristor T6 capacitor C2 oscillates along thyristor -6-inductor L2 loop, so that the voltage of capacitor C2 is reversed.
  • the voltage on capacitor C2 is -U C2 , which is the preparation for forced commutation of the next thyristor T2.
  • the MMC converter valve sub-module structure based on the thyristor device uses the thyristor device instead of the IGBT device, which reduces the switching loss of the device, reduces the control complexity, and improves the conversion efficiency of the sub-module;
  • Single thyristor device has higher rated voltage and current than IGBT device.
  • the voltage of the converter valve is increased, the number of series of sub-modules required is small, which reduces the difficulty of voltage equalization between sub-modules, and is more conducive to MMC converter valve. Towards higher voltage levels.
  • the thyristor device provided by the invention has mature process and high reliability compared with the IGBT device.
  • Figure 1 shows the topology of the MMC converter valve submodule based on IGBT device
  • FIG. 2 is a topological structural view of a thyristor-based MMC converter valve sub-module provided by the present invention. detailed description
  • the topology structure of the thyristor-based MMC converter valve sub-module provided by the present invention is as shown in FIG. 2, including a main circuit and a forced commutation circuit connected in parallel with the two ends thereof; the main circuit includes a thyristor unit I, a thyristor unit II and a capacitor C;
  • the thyristor unit I and the thyristor unit II are each composed of a thyristor and a diode connected in anti-parallel thereto.
  • the thyristor unit I is connected in parallel with the thyristor unit ;; the capacitor C is connected between the thyristor unit I and the thyristor unit ⁇ .
  • the thyristor unit 1 includes a thyristor T1 and a diode D1 connected in anti-parallel thereto; the cathode of the thyristor T1, the anode of the diode D1, the cathode of the diode D1, and the anode of the thyristor T1 are sequentially connected to form a closed loop I; the thyristor unit includes a thyristor T2 and a diode D2 in anti-parallel thereto; the cathode of the thyristor T2, the anode of the diode D2, the cathode of the diode D2, and the anode of the thyristor T2 are sequentially connected to form a closed loop II.
  • the number of forced commutation circuits is 2; one of the forced commutation circuits includes thyristors T3 and T5, an inductor L1 and a capacitor C1; the inductor L1 and the capacitor C1 are connected in series to form an L1-C1 branch; the thyristors ⁇ 5 and L1- The C1 branch is connected in parallel; the thyristor ⁇ 3 is connected between the L1-C1 branch and the thyristor unit I;
  • Another forced commutation circuit includes thyristors ⁇ 4 and ⁇ 6, an inductor L2 and a capacitor C2; the inductor L2 and the capacitor C2 are connected in series to form an L2-C2 branch; the thyristor ⁇ 6 is connected in parallel with the L2-C2 branch; the thyristor ⁇ 4 is connected to the L2 - between the C2 branch and the thyristor unit II.
  • the method for controlling a thyristor-based MMC converter valve sub-module device comprises the following steps:
  • capacitor C charges capacitor C1, until voltage U C1 across capacitor C1 is greater than or equal to the voltage value of capacitor C, the thyristors T3 and T2 are turned off;
  • capacitor CI forms an oscillating circuit along the inductor L1-thyristor ⁇ 5, so that the voltage on the capacitor C1 is reversed.
  • the oscillating current is zero, the voltage of the capacitor C1 is -U C1 , and the thyristor T5 is turned off;
  • Trigger thyristor T6 capacitor C2 forms an oscillating circuit along thyristor -6-inductor L2, so that the voltage on capacitor C2 is reversed.
  • the oscillating current is zero, the voltage of capacitor C2 is -U C2 , and the thyristor T6 is turned off.
  • the capacitor C1 forms an oscillating circuit along the diode D1-thyristor ⁇ 3-inductor L1, so that the current flowing through the thyristor T1 is zero, the thyristor T1 is turned off, and when the oscillating current crosses zero, the thyristor ⁇ 3 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C1 is +U C1 , the current I is transferred to the capacitor C-diode D2 loop, and the output voltage is the voltage Uc of the capacitor C ;
  • Trigger thyristor T5 capacitor C1 oscillates along the loop of inductor L1-thyristor ⁇ 5, so that the voltage of capacitor C1 is reversed.
  • the oscillating current is zero, the voltage on capacitor C1 is -U C1 , which is ready for forced commutation of the next thyristor T1;
  • the capacitor C2 forms an oscillating circuit along the inductor L2-thyristor ⁇ 4-diode D2, so that the current flowing through the thyristor ⁇ 2 is zero, and the thyristor ⁇ 2 is turned off.
  • the thyristor ⁇ 4 is turned off due to
  • the current I supplements the oscillation circuit loss
  • the voltage of the capacitor C2 is +U C2
  • the current I is transferred to the circuit of the diode D1, and the output voltage is zero;
  • Trigger thyristor T6 capacitor C2 oscillates along thyristor -6-inductor L2 loop, so that the voltage of capacitor C2 is reversed. When the oscillating current is zero, the voltage on capacitor C2 is -U C2 , which is the preparation for forced commutation of the next thyristor T2.
  • the above four working modes are each run once for one working cycle, and the submodule outputs electricity.
  • the pressure Uo is zero and U c .

Abstract

The present invention relates to the field of power systems and power electronics, in particular to a thyristor-device-based MMC converter valve submodule device and control method thereof. The device comprises a main circuit and forced commutation circuits in parallel connection with the two terminals of the main circuit; the main circuit comprises a thyristor unit I, a thyristor unit II, and a capacitor C; the thyristor unit I and the thyristor unit II are both comprised of a thyristor and a diode in inverse parallel connection with the thyristor. The method comprises the following steps: (1) respectively precharging a capacitor C1 and a capacitor C2 in the two forced commutation circuits; and (2) the submodule works and outputs a voltage. The thyristor-device-based MMC converter valve submodule structure utilizes a thyristor device to replace an IGBT device, thus reducing the switching loss of the device, reducing control complexity, and improving the transformation efficiency of the submodule.

Description

一种基于晶闸管器件的 MMC换流阀子模块装置及其控制方法 技术领域  MMC converter valve sub-module device based on thyristor device and control method thereof
本发明涉及电力系统和电力电子领域， 具体涉及一种基于晶闸管器件的 MMC换流阀子模块装置及其控制方法， 尤其涉及一种基于晶闸管器件的 MMC 换流阀子模块拓扑结构装置及其控制方法。 背景技术  The invention relates to the field of power system and power electronics, in particular to a MMC converter valve sub-module device based on a thyristor device and a control method thereof, in particular to a MMC converter valve sub-module topology structure device based on a thyristor device and control thereof method. Background technique
由于能源短缺和环境趋向恶化， 大力发展新能源成为我国发展的主要方向， 柔性直流输电技术是新能源并网的主要手段。 柔性直流输电技术的核心设备-电 压源控制 （VSC) 换流阀， 目前主要采用模块化多电平 （MMC) 结构， 它先由 可关断器件构成子模块， 再利用多个子模块串联组成。  Due to energy shortages and the deterioration of the environment, vigorous development of new energy has become the main direction of China's development. Flexible DC transmission technology is the main means of new energy integration. The core equipment of flexible DC transmission technology - voltage source control (VSC) converter valve, currently mainly adopts modular multi-level (MMC) structure, which first consists of sub-modules that can be turned off, and then uses multiple sub-modules in series.
子模块的结构对于 VSC换流阀的性能及控制的复杂度至关重要， 目前采用 的子模块结构见图 1， 由两个 IGBT器件和一个电容器组成半桥结构， 通过控制 IGBT器件的开通和关断输出电压。 IGBT器件， 相较于晶闸管器件， 其开关损 耗较大， 控制复杂， 单只器件的额定电压电流较低， 随着电压等级的不断提高， 子模块串联数增加， 子模块间的平衡均压困难， 不利于换流阀向高压大容量方向 发展。 发明内容  The structure of the sub-module is very important for the performance and control complexity of the VSC converter valve. The sub-module structure currently used is shown in Figure 1. The two-IGBT structure consists of two IGBT devices and one capacitor, by controlling the turn-on and turn-on of the IGBT device. Turn off the output voltage. Compared with thyristor devices, IGBT devices have large switching losses and complicated control. The rated voltage and current of a single device are low. As the voltage level increases, the number of sub-modules in series increases, and the balance between sub-modules is difficult. It is not conducive to the development of the converter valve to high pressure and large capacity. Summary of the invention
针对现有技术的不足，本发明提供一种基于晶闸管器件的 MMC换流阀子模 块装置及其控制方法，本发明基于晶闸管器件的 MMC换流阀子模块结构利用晶 闸管器件代替 IGBT器件， 降低了器件的开关损耗， 降低了控制复杂度， 提高了 子模块的转换效率。  In view of the deficiencies of the prior art, the present invention provides an MMC converter valve sub-module device based on a thyristor device and a control method thereof, and the MMC converter valve sub-module structure based on the thyristor device uses a thyristor device instead of the IGBT device, thereby reducing The switching loss of the device reduces the control complexity and improves the conversion efficiency of the sub-module.
本发明的目的是采用下述技术方案实现的：  The object of the present invention is achieved by the following technical solutions:
一种基于晶闸管器件的 MMC换流阀子模块装置， 其改进之处在于， 所述装 置包括主电路以及与其两端并联的强迫换流电路;所述主电路包括晶闸管单元 I、 晶闸管单元 Π和电容器 C;所述晶闸管单元 I和晶闸管单元 II均由晶闸管和与其 反并联的二极管组成。 其中， 所述晶闸管单元 I与晶闸管单元 π并联； 电容器 C连接在晶闸管单 元 I与晶闸管单元 Π之间。 A thyristor-based MMC converter valve sub-module device is improved in that the device includes a main circuit and a forced commutation circuit connected in parallel with both ends thereof; the main circuit includes a thyristor unit I, a thyristor unit, and Capacitor C; the thyristor unit I and the thyristor unit II are each composed of a thyristor and a diode connected in anti-parallel thereto. The thyristor unit I is connected in parallel with the thyristor unit π; the capacitor C is connected between the thyristor unit I and the thyristor unit 。.
其中， 所述晶闸管单元 I包括晶闸管 T1和与其反并联的二极管 D1 ; 所述晶 闸管 T1的阴极、 二极管 D1的阳极连接、 二极管 D1的阴极和晶闸管 T1的阳极 依次连接组成闭合回路 I； 所述晶闸管单元 Π包括晶闸管 Τ2和与其反并联的二 极管 D2; 所述晶闸管 Τ2的阴极、 二极管 D2的阳极连接、 二极管 D2的阴极和 晶闸管 Τ2的阳极依次连接组成闭合回路 II。  The thyristor unit 1 includes a thyristor T1 and a diode D1 connected in anti-parallel thereto; the cathode of the thyristor T1, the anode of the diode D1, the cathode of the diode D1, and the anode of the thyristor T1 are sequentially connected to form a closed loop I; the thyristor The unit Π includes a thyristor Τ2 and a diode D2 connected in anti-parallel thereto; the cathode of the thyristor Τ2, the anode connection of the diode D2, the cathode of the diode D2, and the anode of the thyristor 依次2 are sequentially connected to form a closed loop II.
其中， 所述强迫换流电路的个数为 2; 其中一个强迫换流电路包括晶闸管 Τ3和 Τ5、 电感 L1和电容 C1 ; 所述电感 L1和电容 C1串联组成 L1-C1支路； 所述晶闸管 Τ5与 L1-C1支路并联； 晶闸管 Τ3连接在 L1-C1支路和晶闸管单元 I之间；  The number of the forced commutation circuits is 2; one of the forced commutation circuits includes thyristors Τ3 and Τ5, the inductor L1 and the capacitor C1; the inductor L1 and the capacitor C1 are connected in series to form an L1-C1 branch; the thyristor Τ5 is connected in parallel with the L1-C1 branch; thyristor Τ3 is connected between the L1-C1 branch and the thyristor unit I;
另一个强迫换流电路包括晶闸管 Τ4和 Τ6、 电感 L2和电容 C2; 所述电感 L2和电容 C2串联组成 L2-C2支路； 所述晶闸管 Τ6与 L2-C2支路并联； 晶闸管 Τ4连接在 L2-C2支路和晶闸管单元 II之间。  Another forced commutation circuit includes thyristors Τ4 and Τ6, an inductor L2 and a capacitor C2; the inductor L2 and the capacitor C2 are connected in series to form an L2-C2 branch; the thyristor Τ6 is connected in parallel with the L2-C2 branch; the thyristor Τ4 is connected to the L2 - between the C2 branch and the thyristor unit II.
本发明基于另一目的提供的一种基于晶闸管器件的 MMC 换流阀子模块装 置的控制方法， 其改进之处在于， 所述方法包括下述步骤：  The present invention is based on another object of the present invention to provide a control method for a thyristor-based MMC converter valve sub-module device, the improvement comprising the steps of:
( 1 ) 分别对两个强迫换流电路中的电容 C1和电容 C2进行预充电； (1) precharging the capacitor C1 and the capacitor C2 in the two forced commutation circuits respectively;
(2) 所述子模块工作并输出电压。 (2) The submodule operates and outputs a voltage.
其中， 所述步骤 （1 ) 中， 分别对两个强迫换流电路中的电容 C1和电容 C2 进行预充电包括下述步骤：  Wherein, in the step (1), precharging the capacitor C1 and the capacitor C2 in the two forced commutation circuits respectively comprises the following steps:
①触发晶闸管 Τ3与 Τ2， 所电容器 C给电容 C1充电， 直到电容 C1两端的 电压 UC1大于或等于电容器 C的电压值， 所述晶闸管 T3与 T2关断； 1 triggering thyristors Τ3 and Τ2, capacitor C charges capacitor C1, until voltage U C1 across capacitor C1 is greater than or equal to the voltage value of capacitor C, the thyristors T3 and T2 are turned off;
②触发晶闸管 T5， 电容 C1沿着电感 L1-晶闸管 Τ5形成振荡回路， 使得电 容 C1上的电压反向， 当振荡电流为零时， 电容 C1电压为 -UC1， 所述晶闸管 T5 关断； 2 Trigger thyristor T5, capacitor C1 forms an oscillating circuit along the inductor L1-thyristor Τ5, so that the voltage on the capacitor C1 is reversed. When the oscillating current is zero, the voltage of the capacitor C1 is -U C1 , and the thyristor T5 is turned off;
③触发晶闸管 T4与 Tl， 利用电容器 C给电容 C2充电， 直到电容 C2两端 的电压 UC2大于或等于电容器 C的电压值， 晶闸管 T1与 T4关断； 3 Trigger the thyristors T4 and Tl, and use the capacitor C to charge the capacitor C2 until the voltage U C2 across the capacitor C2 is greater than or equal to the voltage value of the capacitor C, and the thyristors T1 and T4 are turned off;
④触发晶闸管 T6， 电容 C2沿着晶闸管 Τ6-电感 L2形成振荡回路， 使得电 容 C2上的电压反向， 当振荡电流为零时， 电容 C2电压为 -UC2， 所述晶闸管 T6 关断。 4 Trigger thyristor T6, capacitor C2 forms an oscillating circuit along thyristor -6-inductor L2, so that the voltage on capacitor C2 is reversed. When the oscillating current is zero, the voltage of capacitor C2 is -U C2 , the thyristor T6 Shut down.
其中， 所述步骤 （2) 中， 所述子模块工作并输出电压包括下述步骤： 一、 当所述电流 I为正时， 触发晶闸管 Tl， 晶闸管 Τ2关断， 晶闸管 T1流 过电流为电流 I， 输出电压为零；  In the step (2), the sub-module working and outputting the voltage includes the following steps: 1. When the current I is positive, the thyristor T1 is triggered, the thyristor Τ2 is turned off, and the thyristor T1 flows current as a current. I, the output voltage is zero;
二、 开通晶闸管 Τ3， 电容 C1沿二极管 D1-晶闸管 Τ3-电感 L1形成振荡回 路， 使得流过晶闸管 T1上的电流为零， 晶闸管 T1关断， 当振荡电流过零时， 晶闸管 Τ3关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C1电压为 +UC1， 电流 I转移到电容器 C-二极管 D2回路， 输出电压为电容器 C的电压 Uc; 2. Turn on the thyristor Τ3. The capacitor C1 forms an oscillating circuit along the diode D1-thyristor Τ3-inductor L1, so that the current flowing through the thyristor T1 is zero, the thyristor T1 is turned off, and when the oscillating current crosses zero, the thyristor Τ3 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C1 is +U C1 , the current I is transferred to the capacitor C-diode D2 loop, and the output voltage is the voltage Uc of the capacitor C ;
触发晶闸管 T5， 电容 C1沿电感 L1-晶闸管 Τ5回路振荡，使得电容 C1的电 压反向， 当振荡电流为零时， 电容 C1上电压为 -UC1， 为下一次晶闸管 T1 的强 迫换流准备； Trigger thyristor T5, capacitor C1 oscillates along the loop of inductor L1-thyristor Τ5, so that the voltage of capacitor C1 is reversed. When the oscillating current is zero, the voltage on capacitor C1 is -U C1 , which is ready for forced commutation of the next thyristor T1;
三、 当所述电流 I为负时， 触发晶闸管 T2， 晶闸管 T1关断， 晶闸管 Τ2上 流过的电流为 I， 输出电压为电容器 C上电压 Uc ; 3. When the current I is negative, the thyristor T2 is triggered, the thyristor T1 is turned off, the current flowing through the thyristor Τ2 is I, and the output voltage is the voltage Uc on the capacitor C ;
四、 开通晶闸管 T4， 电容 C2沿电感 L2-晶闸管 Τ4-二极管 D2形成振荡回 路， 使得流过晶闸管 Τ2上的电流为零， 晶闸管 Τ2关断， 当振荡电流过零后， 晶闸管 Τ4关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C2电压为 +UC2， 电流 I转移到二极管 D1回路， 输出电压为零； 4. Turn on the thyristor T4. The capacitor C2 forms an oscillating circuit along the inductor L2-thyristor Τ4-diode D2, so that the current flowing through the thyristor 为零2 is zero, and the thyristor Τ2 is turned off. When the oscillating current crosses zero, the thyristor Τ4 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C2 is +U C2 , and the current I is transferred to the circuit of the diode D1, and the output voltage is zero;
触发晶闸管 T6， 电容 C2沿晶闸管 Τ6-电感 L2回路振荡，使得电容 C2的电 压反向， 当振荡电流为零时， 电容 C2上电压为 -UC2， 为下一次晶闸管 T2的强 迫换流准备。 与现有技术比， 本发明达到的有益效果是： Trigger thyristor T6, capacitor C2 oscillates along thyristor -6-inductor L2 loop, so that the voltage of capacitor C2 is reversed. When the oscillating current is zero, the voltage on capacitor C2 is -U C2 , which is the preparation for forced commutation of the next thyristor T2. Compared with the prior art, the beneficial effects achieved by the present invention are:
1、 基于晶闸管器件的 MMC换流阀子模块结构利用晶闸管器件代替 IGBT 器件， 降低了器件的开关损耗， 降低了控制复杂度， 提高了子模块的转换效率； 1. The MMC converter valve sub-module structure based on the thyristor device uses the thyristor device instead of the IGBT device, which reduces the switching loss of the device, reduces the control complexity, and improves the conversion efficiency of the sub-module;
2、 单只晶闸管器件较之于 IGBT器件， 额定电压电流大， 当换流阀电压提 高时， 所需子模块串联级数少， 降低了子模块间的均压难度， 更利于 MMC换流 阀向更高电压等级发展。 2. Single thyristor device has higher rated voltage and current than IGBT device. When the voltage of the converter valve is increased, the number of series of sub-modules required is small, which reduces the difficulty of voltage equalization between sub-modules, and is more conducive to MMC converter valve. Towards higher voltage levels.
3、 本发明提供的晶闸管器件较之于 IGBT器件工艺成熟， 可靠性高。 附图说明 3. The thyristor device provided by the invention has mature process and high reliability compared with the IGBT device. DRAWINGS
图 1是基于 IGBT器件的 MMC换流阀子模块拓扑结构；  Figure 1 shows the topology of the MMC converter valve submodule based on IGBT device;
图 2是本发明提供的基于晶闸管器件的 MMC换流阀子模块拓扑结构图。 具体实施方式  2 is a topological structural view of a thyristor-based MMC converter valve sub-module provided by the present invention. detailed description
下面结合附图对本发明的具体实施方式作进一步的详细说明。  The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
本发明提供的基于晶闸管器件的 MMC换流阀子模块拓扑结构如图 2所示， 包括主电路以及与其两端并联的强迫换流电路； 主电路包括晶闸管单元 I、 晶闸 管单元 II和电容器 C;所述晶闸管单元 I和晶闸管单元 II均由晶闸管和与其反并 联的二极管组成。  The topology structure of the thyristor-based MMC converter valve sub-module provided by the present invention is as shown in FIG. 2, including a main circuit and a forced commutation circuit connected in parallel with the two ends thereof; the main circuit includes a thyristor unit I, a thyristor unit II and a capacitor C; The thyristor unit I and the thyristor unit II are each composed of a thyristor and a diode connected in anti-parallel thereto.
晶闸管单元 I与晶闸管单元 Π并联；电容器 C连接在晶闸管单元 I与晶闸管 单元 Π之间。  The thyristor unit I is connected in parallel with the thyristor unit ;; the capacitor C is connected between the thyristor unit I and the thyristor unit 。.
晶闸管单元 I包括晶闸管 T1和与其反并联的二极管 D1 ; 所述晶闸管 T1的 阴极、二极管 D1的阳极连接、二极管 D1的阴极和晶闸管 T1的阳极依次连接组 成闭合回路 I； 所述晶闸管单元 Π包括晶闸管 T2和与其反并联的二极管 D2; 所 述晶闸管 T2的阴极、 二极管 D2的阳极连接、 二极管 D2的阴极和晶闸管 T2的 阳极依次连接组成闭合回路 II。  The thyristor unit 1 includes a thyristor T1 and a diode D1 connected in anti-parallel thereto; the cathode of the thyristor T1, the anode of the diode D1, the cathode of the diode D1, and the anode of the thyristor T1 are sequentially connected to form a closed loop I; the thyristor unit includes a thyristor T2 and a diode D2 in anti-parallel thereto; the cathode of the thyristor T2, the anode of the diode D2, the cathode of the diode D2, and the anode of the thyristor T2 are sequentially connected to form a closed loop II.
强迫换流电路的个数为 2; 其中一个强迫换流电路包括晶闸管 T3和 T5、 电 感 L1和电容 C1 ; 所述电感 L1和电容 C1串联组成 L1-C1支路； 所述晶闸管 Τ5 与 L1-C1支路并联； 晶闸管 Τ3连接在 L1-C1支路和晶闸管单元 I之间；  The number of forced commutation circuits is 2; one of the forced commutation circuits includes thyristors T3 and T5, an inductor L1 and a capacitor C1; the inductor L1 and the capacitor C1 are connected in series to form an L1-C1 branch; the thyristors Τ5 and L1- The C1 branch is connected in parallel; the thyristor Τ3 is connected between the L1-C1 branch and the thyristor unit I;
另一个强迫换流电路包括晶闸管 Τ4和 Τ6、 电感 L2和电容 C2; 所述电感 L2和电容 C2串联组成 L2-C2支路； 所述晶闸管 Τ6与 L2-C2支路并联； 晶闸管 Τ4连接在 L2-C2支路和晶闸管单元 II之间。  Another forced commutation circuit includes thyristors Τ4 and Τ6, an inductor L2 and a capacitor C2; the inductor L2 and the capacitor C2 are connected in series to form an L2-C2 branch; the thyristor Τ6 is connected in parallel with the L2-C2 branch; the thyristor Τ4 is connected to the L2 - between the C2 branch and the thyristor unit II.
本发明提供的基于晶闸管器件的 MMC换流阀子模块装置的控制方法，所述 方法包括下述步骤：  The method for controlling a thyristor-based MMC converter valve sub-module device provided by the present invention comprises the following steps:
( 1 ) 在子模块工作之前， 分别对两个强迫换流电路中的电容 C1和电容 C2 进行预充电；  (1) pre-charging the capacitor C1 and the capacitor C2 in the two forced commutation circuits before the sub-module works;
①触发晶闸管 Τ3与 Τ2， 所电容器 C给电容 C1充电， 直到电容 C1两端的 电压 UC1大于或等于电容器 C的电压值， 所述晶闸管 T3与 T2关断； ②触发晶闸管 T5， 电容 CI沿着电感 L1-晶闸管 Τ5形成振荡回路， 使得电 容 C1上的电压反向， 当振荡电流为零时， 电容 C1电压为 -UC1， 所述晶闸管 T5 关断； 1 triggering thyristors Τ3 and Τ2, capacitor C charges capacitor C1, until voltage U C1 across capacitor C1 is greater than or equal to the voltage value of capacitor C, the thyristors T3 and T2 are turned off; 2 trigger thyristor T5, capacitor CI forms an oscillating circuit along the inductor L1-thyristor Τ5, so that the voltage on the capacitor C1 is reversed. When the oscillating current is zero, the voltage of the capacitor C1 is -U C1 , and the thyristor T5 is turned off;
③触发晶闸管 T4与 Tl， 利用电容器 C给电容 C2充电， 直到电容 C2两端 的电压 UC2大于或等于电容器 C的电压值， 晶闸管 T1与 T4关断； 3 Trigger the thyristors T4 and Tl, and use the capacitor C to charge the capacitor C2 until the voltage U C2 across the capacitor C2 is greater than or equal to the voltage value of the capacitor C, and the thyristors T1 and T4 are turned off;
④触发晶闸管 T6， 电容 C2沿着晶闸管 Τ6-电感 L2形成振荡回路， 使得电 容 C2上的电压反向， 当振荡电流为零时， 电容 C2电压为 -UC2， 所述晶闸管 T6 关断。 4 Trigger thyristor T6, capacitor C2 forms an oscillating circuit along thyristor -6-inductor L2, so that the voltage on capacitor C2 is reversed. When the oscillating current is zero, the voltage of capacitor C2 is -U C2 , and the thyristor T6 is turned off.
(2) 强迫换流回路预充电过程结束后， 子模块进入工作状态， 其工作原理 如下：  (2) After the pre-charge process of the forced commutation loop is completed, the sub-module enters the working state, and its working principle is as follows:
一、 当所述电流 I为正时， 触发晶闸管 Tl， 晶闸管 Τ2关断， 晶闸管 T1流 过电流为电流 I， 输出电压为零；  1. When the current I is positive, the thyristor Tl is triggered, the thyristor Τ2 is turned off, the current flowing through the thyristor T1 is current I, and the output voltage is zero;
二、 开通晶闸管 Τ3， 电容 C1沿二极管 D1-晶闸管 Τ3-电感 L1形成振荡回 路， 使得流过晶闸管 T1上的电流为零， 晶闸管 T1关断， 当振荡电流过零时， 晶闸管 Τ3关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C1电压为 +UC1， 电流 I转移到电容器 C-二极管 D2回路， 输出电压为电容器 C的电压 Uc; 2. Turn on the thyristor Τ3. The capacitor C1 forms an oscillating circuit along the diode D1-thyristor Τ3-inductor L1, so that the current flowing through the thyristor T1 is zero, the thyristor T1 is turned off, and when the oscillating current crosses zero, the thyristor Τ3 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C1 is +U C1 , the current I is transferred to the capacitor C-diode D2 loop, and the output voltage is the voltage Uc of the capacitor C ;
触发晶闸管 T5， 电容 C1沿电感 L1-晶闸管 Τ5回路振荡，使得电容 C1的电 压反向， 当振荡电流为零时， 电容 C1上电压为 -UC1， 为下一次晶闸管 T1 的强 迫换流准备； Trigger thyristor T5, capacitor C1 oscillates along the loop of inductor L1-thyristor Τ5, so that the voltage of capacitor C1 is reversed. When the oscillating current is zero, the voltage on capacitor C1 is -U C1 , which is ready for forced commutation of the next thyristor T1;
三、 当所述电流 I为负时， 触发晶闸管 T2， 晶闸管 T1关断， 晶闸管 Τ2上 流过的电流为 I， 输出电压为电容器 C上电压 Uc ; 3. When the current I is negative, the thyristor T2 is triggered, the thyristor T1 is turned off, the current flowing through the thyristor Τ2 is I, and the output voltage is the voltage Uc on the capacitor C ;
四、 开通晶闸管 T4， 电容 C2沿电感 L2-晶闸管 Τ4-二极管 D2形成振荡回 路， 使得流过晶闸管 Τ2上的电流为零， 晶闸管 Τ2关断， 当振荡电流过零后， 晶闸管 Τ4关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C2电压为 +UC2， 电流 I转移到二极管 D1回路， 输出电压为零； 4. Turn on the thyristor T4. The capacitor C2 forms an oscillating circuit along the inductor L2-thyristor Τ4-diode D2, so that the current flowing through the thyristor 为零2 is zero, and the thyristor Τ2 is turned off. When the oscillating current crosses zero, the thyristor Τ4 is turned off due to During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C2 is +U C2 , and the current I is transferred to the circuit of the diode D1, and the output voltage is zero;
触发晶闸管 T6， 电容 C2沿晶闸管 Τ6-电感 L2回路振荡，使得电容 C2的电 压反向， 当振荡电流为零时， 电容 C2上电压为 -UC2， 为下一次晶闸管 T2的强 迫换流准备。 Trigger thyristor T6, capacitor C2 oscillates along thyristor -6-inductor L2 loop, so that the voltage of capacitor C2 is reversed. When the oscillating current is zero, the voltage on capacitor C2 is -U C2 , which is the preparation for forced commutation of the next thyristor T2.
理想情况下， 以上四个工作模式各运行一次为一个工作周期， 子模块输出电 压 Uo为零和 Uc两种电平。 Ideally, the above four working modes are each run once for one working cycle, and the submodule outputs electricity. The pressure Uo is zero and U c .
最后应当说明的是： 以上实施例仅用以说明本发明的技术方案而非对其限制，尽 管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理 解： 依然可以对本发明的具体实施方式进行修改或者等同替换， 而未脱离本发明 精神和范围的任何修改或者等同替换， 其均应涵盖在本发明的权利要求范围当 中。 Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention and are not limited thereto, although the present invention will be described in detail with reference to the above embodiments, and those skilled in the art should understand that the present invention can still be The invention is to be construed as being limited to the scope of the appended claims.

Claims

权 利 要 求 Rights request
1、 一种基于晶闸管器件的 MMC换流阀子模块装置， 其特征在于， 所述装置包 括主电路以及与其两端并联的强迫换流电路； 所述主电路包括晶闸管单元 I、 晶 闸管单元 Π和电容器 C;所述晶闸管单元 I和晶闸管单元 II均由晶闸管和与其反 并联的二极管组成。 1. An MMC commutation valve sub-module device based on a thyristor device, characterized in that the device includes a main circuit and a forced commutation circuit connected in parallel with its two ends; the main circuit includes a thyristor unit I, a thyristor unit II and Capacitor C; the thyristor unit I and the thyristor unit II are both composed of a thyristor and a diode connected in anti-parallel with it.
2、 如权利要求 1所述的基于晶闸管器件的 MMC换流阀子模块装置， 其特征在 于，所述晶闸管单元 I与晶闸管单元 Π并联； 电容器 C连接在晶闸管单元 I与晶 闸管单元 Π之间。 2. The MMC converter valve sub-module device based on thyristor devices according to claim 1, characterized in that the thyristor unit I and the thyristor unit Π are connected in parallel; the capacitor C is connected between the thyristor unit I and the thyristor unit Π.
3、 如权利要求 2所述的基于晶闸管器件的 MMC换流阀子模块装置， 其特征在 于， 所述晶闸管单元 I包括晶闸管 T1和与其反并联的二极管 D1 ; 所述晶闸管 T1的阴极、 二极管 D1的阳极连接、 二极管 D1的阴极和晶闸管 T1的阳极依次 连接组成闭合回路 I； 所述晶闸管单元 Π包括晶闸管 T2和与其反并联的二极管 D2; 所述晶闸管 T2的阴极、 二极管 D2的阳极连接、 二极管 D2的阴极和晶闸 管 T2的阳极依次连接组成闭合回路 II。 3. The MMC converter valve sub-module device based on a thyristor device as claimed in claim 2, wherein the thyristor unit I includes a thyristor T1 and a diode D1 connected in anti-parallel with it; the cathode of the thyristor T1 and the diode D1 The anode connection, the cathode of the diode D1 and the anode of the thyristor T1 are connected in sequence to form a closed loop I; the thyristor unit Π includes a thyristor T2 and a diode D2 connected in anti-parallel with it ; the cathode of the thyristor T2, the anode connection of the diode D2, the diode The cathode of D2 and the anode of thyristor T2 are connected in sequence to form a closed loop II.
4、 如权利要求 1所述的基于晶闸管器件的 MMC换流阀子模块装置， 其特征在 于，所述强迫换流电路的个数为 2;其中一个强迫换流电路包括晶闸管 T3和 T5、 电感 L1和电容 C1 ; 所述电感 L1和电容 C1串联组成 L1-C1支路； 所述晶闸管 Τ5与 L 1 -C 1支路并联； 晶闸管 Τ3连接在 L 1 -C 1支路和晶闸管单元 I之间； 另一个强迫换流电路包括晶闸管 Τ4和 Τ6、 电感 L2和电容 C2; 所述电感 L2和电容 C2串联组成 L2-C2支路； 所述晶闸管 Τ6与 L2-C2支路并联； 晶闸管 Τ4连接在 L2-C2支路和晶闸管单元 II之间。 4. The MMC commutation valve sub-module device based on thyristor devices according to claim 1, characterized in that the number of forced commutation circuits is 2; one of the forced commutation circuits includes thyristors T3 and T5 and an inductor. L1 and capacitor C1; the inductor L1 and capacitor C1 are connected in series to form the L1-C1 branch; the thyristor T5 is connected in parallel with the L1-C1 branch; the thyristor T3 is connected between the L1-C1 branch and the thyristor unit I time; another forced commutation circuit includes thyristors T4 and T6, inductor L2 and capacitor C2; the inductor L2 and capacitor C2 are connected in series to form the L2-C2 branch; the thyristor T6 is connected in parallel with the L2-C2 branch; the thyristor T4 is connected Between branch L2-C2 and thyristor unit II.
5、 一种基于晶闸管器件的 MMC换流阀子模块装置的控制方法， 其特征在于， 所述方法包括下述步骤： 5. A control method for an MMC converter valve submodule device based on a thyristor device, characterized in that the method includes the following steps:
( 1 ) 分别对两个强迫换流电路中的电容 C1和电容 C2进行预充电； (1) Precharge the capacitor C1 and capacitor C2 in the two forced commutation circuits respectively;
(2) 所述子模块工作并输出电压。 (2) The sub-module works and outputs voltage.
6、 如权利要求 5基于晶闸管器件的 MMC换流阀子模块装置的控制方法， 其特 征在于， 所述步骤（1 ) 中， 分别对两个强迫换流电路中的电容 C1和电容 C2进 行预充电包括下述步骤： 6. The control method of the MMC commutation valve sub-module device based on the thyristor device according to claim 5, characterized in that in the step (1), the capacitance C1 and the capacitance C2 in the two forced commutation circuits are preset respectively. Charging includes the following steps:
①触发晶闸管 Τ3与 Τ2， 所电容器 C给电容 C1充电， 直到电容 C1两端的 电压 UC1大于或等于电容器 C的电压值， 所述晶闸管 T3与 T2关断； ① Trigger the thyristors T3 and T2, so the capacitor C charges the capacitor C1 until the voltage across the capacitor C1 The voltage U C1 is greater than or equal to the voltage value of the capacitor C, and the thyristors T3 and T2 are turned off;
②触发晶闸管 T5， 电容 C1沿着电感 L1-晶闸管 Τ5形成振荡回路， 使得电 容 C1上的电压反向， 当振荡电流为零时， 电容 C1电压为 -UC1， 所述晶闸管 T5 关断； ② Trigger the thyristor T5, the capacitor C1 forms an oscillation loop along the inductor L1-thyristor T5, causing the voltage on the capacitor C1 to reverse. When the oscillation current is zero, the voltage of the capacitor C1 is -UC1 , and the thyristor T5 is turned off;
③触发晶闸管 T4与 Tl， 利用电容器 C给电容 C2充电， 直到电容 C2两端 的电压 UC2大于或等于电容器 C的电压值， 晶闸管 T1与 T4关断； ③Trigger the thyristors T4 and Tl, and use the capacitor C to charge the capacitor C2 until the voltage U C2 across the capacitor C2 is greater than or equal to the voltage value of the capacitor C, and the thyristors T1 and T4 are turned off;
④触发晶闸管 T6， 电容 C2沿着晶闸管 Τ6-电感 L2形成振荡回路， 使得电 容 C2上的电压反向， 当振荡电流为零时， 电容 C2电压为 -UC2， 所述晶闸管 T6 关断。 ④Trigger thyristor T6, capacitor C2 forms an oscillation loop along thyristor T6-inductor L2, causing the voltage on capacitor C2 to reverse. When the oscillation current is zero, the voltage of capacitor C2 is -UC2 , and the thyristor T6 is turned off.
7、 如权利要求 5基于晶闸管器件的 MMC换流阀子模块装置的控制方法， 其特 征在于， 所述步骤 （2) 中， 所述子模块工作并输出电压包括下述步骤： 7. The control method of the MMC converter valve sub-module device based on the thyristor device according to claim 5, characterized in that in the step (2), the sub-module operates and outputs the voltage including the following steps:
一、 当所述电流 I为正时， 触发晶闸管 Tl， 晶闸管 Τ2关断， 晶闸管 T1流 过电流为电流 I， 输出电压为零； 1. When the current I is positive, the thyristor T1 is triggered, the thyristor T2 is turned off, the current flowing through the thyristor T1 is the current I, and the output voltage is zero;
二、 开通晶闸管 Τ3， 电容 C1沿二极管 D1-晶闸管 Τ3-电感 L1形成振荡回 路， 使得流过晶闸管 T1上的电流为零， 晶闸管 T1关断， 当振荡电流过零时， 晶闸管 Τ3关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C1电压为 +UC1， 电流 I转移到电容器 C-二极管 D2回路， 输出电压为电容器 C的电压 Uc; 2. Turn on the thyristor T3, and the capacitor C1 forms an oscillation loop along the diode D1-thyristor T3-inductor L1, so that the current flowing through the thyristor T1 is zero, and the thyristor T1 is turned off. When the oscillating current crosses zero, the thyristor T3 is turned off. During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C1 is +U C1 , the current I is transferred to the capacitor C-diode D2 circuit, and the output voltage is the voltage Uc of the capacitor C ;
触发晶闸管 T5， 电容 C1沿电感 L1-晶闸管 Τ5回路振荡，使得电容 C1的电 压反向， 当振荡电流为零时， 电容 C1上电压为 -UC1， 为下一次晶闸管 T1 的强 迫换流准备； Triggering the thyristor T5, the capacitor C1 oscillates along the inductor L1-thyristor T5 loop, causing the voltage of the capacitor C1 to reverse direction. When the oscillation current is zero, the voltage on the capacitor C1 is -UC1 , preparing for the next forced commutation of the thyristor T1;
三、 当所述、 电流 I为负时， 触发晶闸管 T2， 晶闸管 T1关断， 晶闸管 Τ2 上流过的电流为 I， 输出电压为电容器 C上电压 Uc; 3. When the current I is negative, the thyristor T2 is triggered, the thyristor T1 is turned off, the current flowing through the thyristor T2 is I, and the output voltage is the voltage U c on the capacitor C;
四、 开通晶闸管 T4， 电容 C2沿电感 L2-晶闸管 Τ4-二极管 D2形成振荡回 路， 使得流过晶闸管 Τ2上的电流为零， 晶闸管 Τ2关断， 当振荡电流过零后， 晶闸管 Τ4关断，由于振荡过程中电流 I补充振荡回路损耗，电容 C2电压为 +UC2， 电流 I转移到二极管 D1回路， 输出电压为零； 4. Turn on the thyristor T4, and the capacitor C2 forms an oscillation circuit along the inductor L2-thyristor T4-diode D2, so that the current flowing through the thyristor T2 is zero, and the thyristor T2 is turned off. When the oscillation current crosses zero, the thyristor T4 is turned off. During the oscillation process, the current I supplements the oscillation circuit loss, the voltage of the capacitor C2 is +U C2 , the current I is transferred to the diode D1 circuit, and the output voltage is zero;
触发晶闸管 T6， 电容 C2沿晶闸管 Τ6-电感 L2回路振荡，使得电容 C2的电 压反向， 当振荡电流为零时， 电容 C2上电压为 -UC2， 为下一次晶闸管 T2的强 迫换流准备。 Thyristor T6 is triggered, and capacitor C2 oscillates along the thyristor T6-inductor L2 loop, causing the voltage of capacitor C2 to reverse direction. When the oscillation current is zero, the voltage on capacitor C2 is -UC2 , preparing for the next forced commutation of thyristor T2.
PCT/CN2013/087110 2012-11-14 2013-11-14 Thyristor-device-based mmc converter valve submodule device and control method thereof WO2014075614A1 (en)

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