基于M3C的AC/AC系统交流不对称故障控制策略研究  

Study on AC Asymmetrical Fault Control Strategy for AC/AC System Based on M3C

作　　者：吴宏远 黄辉 裴星宇 马彦宾 王立华 刘亚冲 WU Hongyuan;HUANG Hui;PEI Xingyu;MA Yanbin;WANG Lihua;LIU Yachong(Zhuhai Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangdong Zhuhai 519000,China;Beijng Sifang Automation Co.,Ltd.,Beijing 100085,China)

机构地区：[1]广东电网有限责任公司珠海供电局,广东珠海519000 [2]北京四方继保自动化股份有限公司,北京100085

出　　处：《电力电容器与无功补偿》2025年第2期143-152,共10页Power Capacitor & Reactive Power Compensation

基　　金：南方电网公司科技项目(030400KK52220008(GDKJXM20220327))。

摘　　要：为了确保模块化多电平矩阵换流器(M3C)在交流电网不对称故障工况下仍能稳定运行,本文研究基于M3C的交流互联系统不对称故障控制策略。推导得出基于M3C的ac/ac系统经双αβ0坐标变换后的解耦数学模型,在此基础上分别设计了M3C所连接的两侧交流系统的控制器,考虑到分别单独设计正负序控制器过程繁琐且较多的控制逻辑会引入控制偏差和控制延迟,本文采用比例谐振控制器控制总电流量。通过调整M3C 9个支路间的4个环流量的分布来实现总电容电压及3个子换流器间、单个子换流器内及支路内子模块间4个维度的电容电压均衡控制。最后,通过算例对文中所提出控制策略和设计的控制器有效性开展仿真分析。结果表明,在交流系统两相不对称短路故障暂态过程中,本文所设计控制策略能够保证整个系统的可靠运行。Forassuring the still stable operation of modularmultilevel matrix converter(M3C)in asymmetrical fault condition of AC network,the asymmetrical fault control strategy of AC interconnection system based on M3C is studied in this paper. The decoupling mathematical model of M3C-based ac/ac system after dual αβ0coordinate transformation is derived.On this basis,controller for the two-side AC systems connected to M3C are designed respectively. Considering the control deviation and control delay due to the detious and multiple control logic control logic process in the individual design of positive and negative sequence controller,the proportional resonance controller is adopted in this paper to control the total currents. By adjusting the distribution of the four circulating currents among the nine branches of M3C,the total capacitive voltage and the four dimensions of capacitive voltage balance control between three sub-converters and between the submodules inside the single sub-converter and branch can be achieved. Finally,simulation analysis is conducted on the effectiveness of the proposed control strategy and designed controller through case. The results show that the control strategy designed in this paper can ensure the reliable operation of the entire system during the transientprocessoftwo-phaseasymmetricshort-circuitfaultsintheACsystem.

关 键 词：模块化多电平矩阵换流器 不对称故障 比例谐振控制器 环流 子模块电压均衡 

分 类 号：TM721[电气工程—电力系统及自动化]