分布式光伏接入主动配电网电压特性研究

Research on Voltage Characteristics of Distributed Photovoltaic Connected Active Distribution Network

分析了分布式光伏电源接入主动配电网后配电网馈线节点电压变化机理,给出以静态电压限值为约束的接入容量极限,探讨了影响主动配电网静态电压变化的各种因素。运用PSCAD/EMTDC电磁暂态软件搭建分散光伏发电多点接入主动配电网的系统模型。结合仿真算例验证上述分析的正确性,修正了不同线路长度接入容量方案,并提出解决分布式光伏发电和负荷网源不协调工作引起的电压偏差的措施和方案。

This paper analyzes the distribution mechanism of feeder node voltage after the distributed photovohaic connected to the ac- tive distribution network, and gives the maximum capacity of PV under static voltage limit. This paper discusses the influences various factors of static voltage ADN, such as the position where PV generation is connected with, the mode of connection of PV gen-eration, output power of PV generation, the line parameters of power grid, the change of load eharacteristics. The electromagnetic transient soft- ware PSCAD/EMTDC is used to built the AND system model of the distributed PV generation nmhi-connection. The correctness of a- bove-mentioned analysis is verified by four calculation examples, correet connected eapacity scheme for different line length, and put forward the measures and solutions whieh solve the voltage deviation caused by the distributed PV generation and the grid load.