CAJ | 학술논문

针对模块化多电平换流器(Modular Multilevel Convert,MMC)三相桥臂相间环流问题,基于微分平坦理论推导出一种环流抑制控制模型.通过分析MMC相间环流的产生本质,根据微分平坦理论的定义,选取系统的输入,输出和中间量,证明了设计出的环流抑制控制器满足微分平坦理论的条件.基于该理论设计的环流抑制控制器,能够大大降低桥臂电流中的环流分量,使其更接近正弦波.最后通过Matlab/Simulink搭建了相应的MMC仿真模型,在未影响MMC外部电压电流的情况下,仿真结果证明了该环流抑制控制模型的有效性,为环流抑制控制器的设计提供了一种新的思路.
침대모괴화다전평환류기(Modular Multilevel Convert,MMC)삼상교비상간배류문제,기우미분평탄이론추도출일충배류억제공제모형.통과분석MMC상간배류적산생본질,근거미분평탄이론적정의,선취계통적수입,수출화중간량,증명료설계출적배류억제공제기만족미분평탄이론적조건.기우해이론설계적배류억제공제기,능구대대강저교비전류중적배류분량,사기경접근정현파.최후통과Matlab/Simulink탑건료상응적MMC방진모형,재미영향MMC외부전압전류적정황하,방진결과증명료해배류억제공제모형적유효성,위배류억제공제기적설계제공료일충신적사로.
As the interphase circulating current exists in the three-phase bridge arm of modular multilevel converter, the differential flatness theory (DFT) based MMC circulating current suppressing controller is deduced. According to the analysis about the nature of the interphase circulating current and the definition of the DFT, it chooses the input, output and intermediate quantity of the control system, proving that the design of circulating current suppressing controller can meet the conditions of DFT. The newly designed controller could reduce the interphase circulating current in the bridge arm current, and make it closely approximate the sine wave. At last, the MMC model is simulated based on Matlab/Simulink. In the case of no impact on MMC external voltage and current, the result show that the control model is effective, which provides a new idea for the design of circulating current suppressing controller.