A Novel Control Strategy for Circulating Current Suppression of Modular Multilevel Converter

Author(s):  
Jiafeng Liang ◽  
Yong Wang ◽  
Yan She ◽  
Yuzhi Yang ◽  
Zhongyuan Peng
2021 ◽  
Vol 261 ◽  
pp. 01035
Author(s):  
kang Liu ◽  
Guige Gao

Modular Multilevel Converter (MMC) has the characteristics of high voltage level and low switching frequency. The traditional modular multilevel converter circulating current control strategy mostly adopts the PI control principle, and the parameter setting is complicated and the accuracy is not high, and the control process is more difficult. Model predictive control strategy is the optimal control method based on the model in the existing time domain. This paper proposes a Model Predictive Control (MPC) method based on carrier phase-shifted pulse width modulation (PSC-PWM) to suppress the circulating current, and output the optimal modulation wave through model prediction. Compared with the traditional control strategy, this strategy is simple to implement, does not require complex tuning calculations, and combines with the traditional capacitor voltage equalization strategy to obtain the output modulation wave. A 7-level MMC simulation control system is built in MATLAB / SIMLINK to verify the theory, comparing with existing control methods, it can be concluded that the proposed method has high calculation efficiency, good control accuracy and strong robustness.


IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 170500-170512 ◽  
Author(s):  
Wentao Liu ◽  
Ke-Jun Li ◽  
Zhijie Liu ◽  
Meiyan Wang

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