Stability Analysis and Controller Optimization of MMC in Standalone Mode

Xingyu Liu, Shuguang Song (), Wenzhong Ma and Yusheng Wang
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Xingyu Liu: College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Shuguang Song: College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Wenzhong Ma: College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Yusheng Wang: PetroChina Planning & Engineering Institute, Beijing 100080, China

Energies, 2024, vol. 17, issue 21, 1-21

Abstract: The modular multilevel converter (MMC) plays an important role in large-scale renewable energy integration and transmission, and it can also operate in standalone mode, powering AC passive loads. This paper focuses on the impact of load variation on the stability of the MMC. First, the impact of load variation on the MMC transfer function is analyzed in detail using the harmonic state-space (HSS) modeling method. Then, by means of the impedance-based stability analysis method, it is found that the MMC tends to become unstable with the increase in inductive loads. If the controller is not well-designed, the system may fail when loads change. Therefore, the worst-case design is used to guarantee the overall system’s stability under all load conditions. The impact of traditional proportional resonant (PR) controller parameters on the system’s stability is analyzed, revealing that the stability margin and control performance of the controller are limited. Thus, an improved controller structure with an additional series of compensators is proposed. Extensive simulation results in MATLAB/Simulink R2024a verify the analysis of this work and the effectiveness of the proposed controller.

Keywords: controller design; load variation; modular multilevel converter; stability analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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