李冠宏,路茂增,边敦新,赵艳雷,路梅雪.基于三次谐波电压注入的扩展混合型MMC运行区域的控制方法[J].电测与仪表,2023,60(8):164-170. liGuanhong,LuMaozeng,BianDunxin,ZhaoYanlei,LuMeixue.Third harmonic voltage injection based control method with expanding the operation area of ??hybrid MMC[J].Electrical Measurement & Instrumentation,2023,60(8):164-170.
基于三次谐波电压注入的扩展混合型MMC运行区域的控制方法
Third harmonic voltage injection based control method with expanding the operation area of ??hybrid MMC
Due to the difference in charging and discharging of the full-bridge sub-module and the half-bridge sub-module, the capacitor voltage imbalance may occur when hybrid MMC operates at a reduced DC-link voltage. In this paper, third harmonic voltage injection based control method which can improve the above imbalance is proposed. First, the mechanism of the capacitor voltage imbalance problem is reviewed, and the boundary conditions when the capacitor voltage imbalance problem occurs is deduced. Further, considering of different DC-link voltage drops, the hybrid MMC operating area is calculated. Then, the effect of the third harmonic voltage injection on the capacitor voltage imbalance is analyzed, and the expansion effect on the operating area of ??the hybrid MMC is analyzed quantitatively. Finally, a double-ended simulation model with Matlab/Simulink is established, and the simulation results verify the effectiveness of the proposed method and corresponding analysis.
