模块化多电平换流器单传感器电容电压平衡控制策略

doi:10.19595/j.cnki.1000-6753.tces.180070

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Abstract Modular multilevel converter (MMC) is widely used in the field of high power and high voltage energy conversion. Especially in high voltage direct current (HVDC) transmission system, there are hundreds of submodules (SMs) in each arm, and a large number of sensors need to be installed to measure the capacitor voltages of all SMs. Then the switching signals are allocated for SMs by means of modulation strategy. The use of a large number of sensors increases the complexity and costs of the measurement system. Therefore, in this paper, a balance control strategy with single sensor measurement based nearest level modulation (NLM) for capacitor voltages is proposed. Different from the conventional measurement with individual voltage sensor for each SM, the proposed strategy employs only one voltage sensor for each arm to measure arm voltage. Combining the measured arm voltage and the charging/discharging direction of the arm current, the capacitor voltage can be obtained through prediction-modification operation in real time to realize the capacitor voltages balance control. Simultaneously, the influence of modulation ratio and control frequency on the prediction-modification balance control strategy can be further qualitatively analyzed, which can provide evidence for selecting proper control parameters. Simulation and experimental results validate the correctness and stability of the proposed strategy under transient and steady-state conditions.

Key words： Modular multilevel converter (MMC) nearest level modulation (NLM) strategy single sensor measurement prediction-modification balancing control strategy

Received: 17 January 2018 Published: 03 September 2018

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TM464

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	Yue Yufei
	Xu Qianming
	Luo An
	Guo Peng

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Yue Yufei,Xu Qianming,Luo An等. Capacitor Voltages Balancing Control Strategy with Single Sensor Measurement for Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3663-3676.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180070 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I16/3663

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