摘要
[目的]模块化多电平变换器(MMC)具有波形质量好、具备四象限运行能力,在船舶电力系统中具有广阔应用前景。整流侧交流电压不平衡工况下MMC采用传统的双环电流控制方法,需额外增加负序电流抑制器优化环流控制器,控制系统复杂度大大增加。为简化交流电压不平衡工况下MMC的控制器设计,对一种基于桥臂电容电压控制的MMC交流电压不平衡控制策略进行了研究。[方法]基于交流电压不平衡工况下MMC运行机理分析,提出桥臂电容电压控制策略,旨在将各个桥臂的电容电压稳定于指令值;以抑制交流电流中的负序分量和抑制桥臂倍频环流分量为控制目标,提出了桥臂电流指令值计算方法。[结果]在MATLAB/Simulink中搭建三相MMC仿真系统,验证了所提策略的可行性和有效性。[结论]基于桥臂电容电压的控制策略,简化了交流电压不平衡工况下MMC的控制器设计的复杂度。
[Purpose]Modular multilevel converter(MMC)with good waveform quality and four-quadrant operation capability,has a broad application prospect in marine power systems.The traditional double-loop current control method for MMC under the AC voltage unbalance condition on the rectifier side requires additional negative sequence current suppressor to optimize the loop current controller,and the complexity of the control system is greatly increased.In order to simplify the controller design of MMC under AC voltage unbalance condition,an AC voltage unbalance control strategy of MMC based on bridge arm capacitor voltage control is investigated.[Method]Based on the analysis of the operation mechanism of MMC under AC voltage unbalance condition,a bridge arm capacitance voltage control strategy is proposed,aiming at stabilizing the capacitance voltage of each bridge arm at the commanded value;and with the control objectives of suppressing the negative sequence component in the AC current and suppressing the bridge arm octave circulating component,a method of calculating the commanded value of the bridge arm current is proposed.[Result]A three-phase MMC simulation system is built in MATLAB/Simulink to verify the feasibility and effectiveness of the strategy proposed in this paper.[Conclusion]The control strategy based on the bridge arm capacitor voltage simplifies the complexity of the controller design of the MMC under the AC voltage unbalance condition.
作者
陈玉
郑钰
王祯
CHEN Yu;ZHENG Yu;WANG Zhen(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan Second Ship Design&Research Institute,Wuhan 430010,China)
出处
《船舶工程》
北大核心
2025年第S1期629-634,共6页
Ship Engineering
关键词
船舶电力系统
模块化多电平变换器
电压不平衡控制
桥臂电容电压控制
负序电流抑制
marine power system
modular multilevel converter(MMC)
voltage unbalance control
arm capacitor voltage control
negative-sequence current suppression
作者简介
陈玉(1991-),男,博士、讲师。研究方向:舰船综合电力系统。;通信作者:郑钰(2004-),女,大学本科。研究方向:电气工程及其自动化。
