Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (4): 98-107.doi: 10.6040/j.issn.1672-3961.0.2019.776

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Determination and control method on power operating area of modular multilevel converter considering the constraint of internal dynamics

ZHANG Feng1, YANG Guixing1, YUE Chenjing2*, HAO Quanrui2, LI Dong2   

  1. 1. State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830063, Xinjiang, China;
    2. School of Electrical Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2020-08-13

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Abstract: This paper proposed a point-scanning method to obtain the internal dynamics of modular multilevel converter(MMC)and determine its operating area by solving the state-space equations. A steady-state model of modular multilevel converter based high voltage direct current(MMC-HVDC)system was developed, and the corresponding state variables of each power point were obtained by solving the state equations. A method to calculate the extreme value of non-sinusoidal periodic quantities was proposed to solve the amplitude of internal dynamics constraints. The power operating area of MMC was obtained when the internal dynamic constraints and the conventional constraints were considered by the point-scanning method. Based on the analysis results, a boundary control strategy was designed to ensure that the system satisfied the internal dynamic constraints. Simulation results in PSCAD/EMTDC verified the correctness of the MMC power operating area determination method and validity of the boundary control strategy.

Key words: modular multilevel converter, internal dynamics, extreme value, power operating area, boundary control strategy

CLC Number: 

  • TM46
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