CAJ | 학술논문

通过对三相三线制模块化多电平换流器(MMC)进行数学建模,得到其网侧电流、环流、直流侧中点电位3个关键电气参量与桥臂电压不同分量之间的对应关系,并在对称稳态下分析了上述电气量所包含的谐波特征分量,提出了 MMC 网侧电流、环流交流分量和直流侧中点电位的解耦控制方法。仿真结果表明,提出的控制方法简单有效,可实现对网侧电流、环流交流分量和直流侧中点电位的解耦控制；各桥臂电气量保持对称,MMC 可保持长期平稳运行。
통과대삼상삼선제모괴화다전평환류기(MMC)진행수학건모,득도기망측전류、배류、직류측중점전위3개관건전기삼량여교비전압불동분량지간적대응관계,병재대칭은태하분석료상술전기량소포함적해파특정분량,제출료 MMC 망측전류、배류교류분량화직류측중점전위적해우공제방법。방진결과표명,제출적공제방법간단유효,가실현대망측전류、배류교류분량화직류측중점전위적해우공제；각교비전기량보지대칭,MMC 가보지장기평은운행。
By setting up a mathematical model of a three-phase three-wire modular multilevel converter (MMC), the correspondence relationship between the AC side current,circulating current and neutral point potential of DC side and the different components of arm voltages is obtained and the harmonics contained in the above-mentioned electrical quantities in symmetric steady-state are analyzed.A decoupled control method of AC side current,the AC component of circulating current and the neutral point potential of DC side is proposed.Simulation results show that the control method proposed is simple and effective,the decoupled control of AC side current,the AC component of circulating current and the neutral point potential of DC side is verified,and the electrical quantities of different arms remain symmetric,contributing to long-term stable operation of MMC.