一种提高光伏发电系统故障穿越能力的混合型控制策略研究

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Abstract Based on the output transient characteristics of photovoltaic (PV) system under different fault conditions, this paper proposes a hybrid control method to enhance the transient performance and fault ride through (FRT) capability of PV system. According to the voltage drop degree of PV power generation system,the output power of PV array can be regulated by Non-MPPT algorithm. So that the grid connected inverter overcurrent problem as well as its DC-link overvoltage problem can be effectively resolved. The flux-coupled current limiters (FCLs) can be utilized to suppress the inverter fault surge current, which can also be coordinated with the reactive current from PV system to further raise the grid-connected voltage of PV system. In the case of asymmetric failure, the proposed method can also reduce the non-balance ratio of PV system grid-connected voltage as well as the second harmonic frequency components of inverter DC-link voltage. Then, the FRT capability of PV system can be integrally improved.

Key words： Non-MPPT algorithm flux coupling fault current limiters reactive current second harmonic frequency component

Received: 21 September 2019 Published: 16 April 2020

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	Ye Tao
	Zheng Feng
	Yang Wei

Cite this article:

Ye Tao,Zheng Feng,Yang Wei. Research on a hybrid control strategy for improving fault ride-through capability of photovoltaic power generation system[J]. Electrical Engineering, 2020, 21(4): 30-43.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I4/30

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