模块化多电平换流器的三轴解耦控制策略

doi:10.12204/j.issn.1000-7229.2022.05.004

电力建设 ›› 2022, Vol. 43 ›› Issue (5): 29-39.doi: 10.12204/j.issn.1000-7229.2022.05.004

• 直流电网关键装备·栏目主持宋强副教授、余占清副教授、赵彪副教授· • 上一篇下一篇

模块化多电平换流器的三轴解耦控制策略

王凯伦¹, 宋强¹(), 周月宾², 杨柳², 张楠³

1.电力系统及大型发电设备安全控制和仿真国家重点实验室(清华大学),北京市 100084
2.直流输电技术国家重点实验室(南方电网科学研究院),广州市 510663
3.中国南方电网有限责任公司超高压输电公司检修试验中心,广州市 510663

收稿日期:2021-07-08 出版日期:2022-05-01 发布日期:2022-04-29
通讯作者: 宋强 E-mail:songqiang@tsinghua.edu.cn
作者简介:王凯伦(1998),男,博士研究生,主要研究方向为柔性直流输电。
周月宾(1987),男,博士,高级工程师,主要研究方向为柔性直流输电技术。
杨柳(1989),女,硕士,高级工程师,主要研究方向为柔性直流输电技术。
张楠(1978), 男, 硕士,高级工程师, 主要研究方向为高压直流输电控制保护。
基金资助:
国家自然科学基金项目(51977119);南方电网公司科技项目(ZBKJXM20180663)

Three-Axis Decoupling Controller for Modular Multilevel Converter

WANG Kailun¹, SONG Qiang¹(), ZHOU Yuebin², YANG Liu², ZHANG Nan³

1. State Key Laboratory of Power System and Generation Equipment(Tsinghua University), Beijing 100084, China
2. State Key Laboratory of HVDC (Electric Power Research Institute of CSG), Guangzhou 510663, China
3. Maintenance and Test Center of Extra High Voltage Power Transmission Co., Ltd.,China Southern Power Grid, Guangzhou 510663, China

Received:2021-07-08 Online:2022-05-01 Published:2022-04-29
Contact: SONG Qiang E-mail:songqiang@tsinghua.edu.cn
Supported by:
National Natural Science Foundation of China(51977119);Science and Technology Project of China Southern Power Grid(ZBKJXM20180663)

摘要/Abstract

摘要：

通过对采用传统dq两轴解耦控制器的模块化多电平换流器(modular multilevel converter, MMC)的分析,揭示了直流端口电压和子模块电容电压的耦合效应,及其所引起的直流端口等效电容效应和子模块电容电压偏差效应。将上、下桥臂电压之和作为可变的直流内电势,并将直流电流作为新的内环状态量,提出了具有三个内环状态变量的三轴解耦控制器。基于新引入的直流电流状态变量,可以使直流端口电压与子模块电容电压控制解耦,同时实现子模块电容的直接控制和直流端口电压/电流的快速灵活控制。基于所提出的内环三轴解耦控制器,针对不同运行场合需求设计了多种外环控制器,可以灵活实现直流电压、有功功率、无功功率、电容电压的控制,适应MMC的各种运行方式。对不同运行方式的MMC进行了仿真研究,验证了所提出的三轴解耦控制的有效性。

关键词: 模块化多电平, dq解耦控制, 直流内电势, 三轴解耦控制

Abstract:

Through the analysis of the modular multilevel converter (MMC) with the traditional d-q axes decoupling controller, this paper reveals the coupling effect between the DC voltage and the sub-module capacitor voltage, which also results in the equivalent capacitance on the DC port and the deviation of the capacitor voltage. Through considering the sum of the upper and lower arm voltages as the control variable, the DC current is introduced as the third inner-loop state variable, and a three-axis decoupling controller with three inner-loop state variables is proposed. Applying the introduced DC current state variable, the control of the DC voltage can be decoupled from the sub-module capacitor voltage. The direct control of the sub-module capacitor voltage and the fast and flexible control of the DC voltage/current can be realized simultaneously. On the basis of the proposed inner-loop three-axis decoupling controller, various outer-loop controllers are designed for different operating modes of MMC, which can flexibly realize the control of DC voltage, active power, reactive power, and capacitor voltages. The feasibility and effectiveness of the proposed three-axis decoupled controller have been verified by using simulation results for different operating modes.

Key words: modular multilevel, dq decoupling control, internal DC voltage, three-axis decoupling control

中图分类号:

TM721

王凯伦, 宋强, 周月宾, 杨柳, 张楠. 模块化多电平换流器的三轴解耦控制策略[J]. 电力建设, 2022, 43(5): 29-39.

WANG Kailun, SONG Qiang, ZHOU Yuebin, YANG Liu, ZHANG Nan. Three-Axis Decoupling Controller for Modular Multilevel Converter[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(5): 29-39.

图/表 15

图1 MMC拓扑示意图

Fig.1 Diagram of an MMC

图2 基于dq两轴解耦的控制器框图

Fig.2 Block diagram of the two-axis dq decoupling controller

图3 采用两轴解耦控制器时的MMC直流侧等效动态电路

Fig.3 DC-side dynamic equivalent circuit of MMC applying two-axis decoupling controller

图4 采用三轴解耦控制器时的MMC直流侧等效动态电路

Fig.4 DC-side dynamic equivalent circuit of MMC applying three-axis decoupling controller

图5 内环三轴解耦控制器框图

Fig.5 Block diagram of three-axis controller

图6 P/Q控制模式控制框图

Fig.6 Block diagram of P/Q power control

表1 MMC模型参数

Table 1 Model parameters of MMC

图7 P/Q控制模式仿真电路

Fig.7 Simulation circuit of P/Q power control

图8 P/Q模式仿真波形

图8 Simulation waveform of P/Q control mode

图9 Udc/Q控制模式控制框图

Fig.9 Block diagram of Udc/Q control

图10 Udc/Q控制模式仿真电路

Fig.10 Simulation circuit of Udc/Q control

图11 Udc/Q控制模式仿真波形

Fig.11 Simulation waveform of Udc/Q control mode

图12 定直流电压模式仿真波形

Fig.12 Simulation waveform of constant DC voltage control mode

图13 定直流电流控制框图

Fig.13 Block diagram of constant DC current control

图14 定直流电流模式仿真波形

Fig.14 Simulation waveform of constant DC current control mode

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模块化多电平换流器的三轴解耦控制策略

Three-Axis Decoupling Controller for Modular Multilevel Converter

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