带恒功率负载的双极性直流系统稳定性分析及其有源阻尼方法

doi:10.19595/j.cnki.1000-6753.tces.201111

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Abstract Because of the negative incremental impedance characteristic, the constant power loads (CPLs) will adversely affect the stability of the DC system and cause system voltage oscillation. Current stability studies are mainly focusing on unipolar DC systems, and lack of research on bipolar DC systems. In this paper, a bipolar DC system based on a half-bridge voltage balancer is introduced. At first, a stability criterion for the bipolar system is illustrated. After that, the system model is derived by state space average method, and system transfer function is obtained. On this basis, a parallel virtual resistance damping method is proposed and analyzed for improving the stability of the bipolar DC system connected with CPLs. Furthermore, the Lyapunov indirect method is adopted to investigate the impact of unbalanced load on the system stability. It turns out that stability of the bipolar DC system is determined by the total output power of the system. Finally, simulation and experimental results verify the proposed method.

Key words： Bipolar DC system constant power loads (CPLs) stability half-bridge voltage balancer virtual resistance

Received: 30 August 2020

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TM46

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	Articles by authors
	You Xiaoyao
	Liu Heping
	Miao Yiru
	Liao Jianquan
	Huang Yuansheng

Cite this article:

You Xiaoyao,Liu Heping,Miao Yiru等. Stability Analysis and Active Damping Method of the Bipolar DC System with Constant Power Loads[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 918-930.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201111 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I4/918

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