多接入点分布式光伏发电系统与配电网交互影响研究

Research of interaction of distributed PV system with multiple access points and distribution network

针对分布式光伏发电的谐波源特性和功率波动性,对分布式光伏接入对配电网谐波、电压波动和闪变的影响进行了分析,并分析了背景电能质量问题对光伏并网点电能质量的影响。同时在DIg SILENT/Power Factory仿真平台上搭建了国际大电网会议(CIGRE)认为适合进行分布式发电接入配电网特性研究的典型配电网络结构,并根据IEC 61400-4-15标准在该平台上搭建了IEC电压闪变仪,对含多接入点分布式光伏发电的配电网的谐波传输和放大特性、电压波动和闪变的影响和评估进行了仿真分析。仿真结果表明,含多接入点分布式光伏的配电网中谐波传输和放大特性非常复杂;配电网各母线节点的电压波动和闪变值的大小与该母线节点的短路容量和功率波动密切相关。

For harmonic source characteristics and power volatility of distributed PV, the effects of PV connecting to grid on harmonics, voltage fluctuation and flicker of distribution network are analyzed. And the impact of background power quality of distribution network on the power quality of PV connecting points is also analyzed. Meanwhile, a typical distribution network is built on DIgSILENT / PowerFactory simulation platform, which is considered to be suitable for study of PV grid-connecting characteristics by CIGRE. According to IEC 61400-4-15 standard, the IEC voltage flicker meter is also built on the platform. And then the harmonic transmission and amplification characteristics, the impact and assessment of voltage fluctuation and flicker are simulated. The simulation results show that harmonic transmission and amplification characteristics are complex in distribution network with multiple distributed PV. Additionally, the value of voltage fluctuation and flicker at each bus node is closely related to the short-circuit capacity of the bus node and power fluctuation of distributed PV.