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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摘要本文基于不同故障工况下光伏发电系统的输出暂态特性,提出一种混合型控制策略增强其暂态性能及其故障穿越能力。该策略依据故障工况下光伏发电系统并网电压跌落程度,采用Non-MPPT算法调节光伏阵列输出功率,解决光伏发电系统并网逆变器直流过压、交流过流问题;利用磁通耦合限流器抑制光伏发电系统故障冲击电流,并与光伏发电系统输出无功电流相配合,进一步抬高光伏发电系统并网电压。在不对称故障情况下,该控制策略还能降低光伏发电系统并网电压不平衡率,减少其并网逆变器直流侧电压所含二倍频谐波分量,整体提高光伏发电系统故障穿越能力。

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	叶韬
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关键词 ： Non-MPPT算法, 磁通耦合限流器, 无功电流, 二倍频谐波分量

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

收稿日期: 2019-09-21 出版日期: 2020-04-16

作者简介: 叶韬（1994-）,男,安徽省铜陵市人,硕士研究生,主要从事光伏系统低电压穿越方面的研究工作。

引用本文:

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

链接本文:

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

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