| 引用本文: | 赵铁军,孟 菁,宋岳奇,谢小英,张孟琛.组串式光伏系统直流串联电弧故障检测与保护策略[J].电力系统保护与控制,2020,48(20):74-82.[点击复制] |
| ZHAO Tiejun,MENG Jing,SONG Yueqi,XIE Xiaoying,ZHANG Mengchen.Series arc detection and protection on the DC side of string-type PVs[J].Power System Protection and Control,2020,48(20):74-82[点击复制] |
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| 摘要: |
| 直流串联电弧是引发光伏系统火灾事故的主要原因之一。针对直流电弧状态和故障问题，提出一种基于逆变器实现的组串式光伏系统直流串联电弧故障检测与保护方法。依据电弧故障的高频特性，以组串输入端滤波电容支路电流为量测获取串联电弧故障信号，基于样本熵和标准差建立串联电弧检测算法并构建2级保护判据及重投方案，保证故障处理的可靠性和灵敏性，并满足逆变器对高频信号低采样率的制约。根据光伏并网逆变器的工作原理和结构组成，提出实现电弧保护的逆变器硬件改造方案。搭建光伏系统电弧故障实验平台并开展实验研究。提出的方法能够实现可靠的检测与保护，在多种情况下验证了所提方法的有效性。 |
| 关键词: 光伏系统 直流电弧 保护判据 样本熵 标准差 |
| DOI：DOI: 10.19783/j.cnki.pspc.191474 |
| 投稿时间：2019-11-26修订日期：2019-12-29 |
| 基金项目:国家自然科学基金资助项目(51877186)；国网冀北电力有限公司科技项目(5201041800N7) |
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| Series arc detection and protection on the DC side of string-type PVs |
| ZHAO Tiejun,MENG Jing,SONG Yueqi,XIE Xiaoying,ZHANG Mengchen |
| (1. Qinhuangdao Power Supply Company, State Grid Jibei Electric Power Company Limited, Qinhuangdao 066004, China;
2. Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Qinhuangdao 066004, China) |
| Abstract: |
| A series arc occurring on the DC side of a PV is the preliminary indication of fire provoked from PVs. For DC arc status and fault problems, this paper contributes a DC series arc detection and protection scheme for string-type PVs implemented with a grid-connected inverter. The scheme employs a high frequency signal of the arc as the fault characteristic that is obtained from the filter capacitor in the PV string terminals of the inverter. The detecting algorithm is established according to the sample entropy and the standard deviation of the arc signal. 2-stage protection criteria and a reclosing strategy are proposed to improve reliability, and to satisfy the sample rate of the processor in the inverter. In line with the constitution of the circuit and operating principle of the inverters, a modification strategy is proposed to fulfill arc protection action. A platform is established for PV series arc testing. The proposed method can achieve reliable detection and protection, and the effectiveness of the method is verified for many cases.
This work is supported by National Natural Science Foundation of China (No. 51877186) and Science and Technology Project of State Grid Jibei Electric Power Co., Ltd. (No. 5201041800N7). |
| Key words: PV generation DC arc protection criteria sample entropy standard deviation |
