利用风电分散接入提升配电网末端电压技术研究及工程示范

Research on the novel technology to raise the voltage of the distribution system based on the distributed wind turbines and the demonstration project

配电网线路末端电压低是影响局部地区供电质量的瓶颈。首先以辐射型配电网为例,分析了配网线路末端电压低的原因,指出配电线路末端电压低不完全是无功不足所导致,其传输有功也将导致末端电压下降。结合吉林省风能资源丰富的特点,提出了基于风电分散接入的配电网末端电压提升方案。该方案将风电机组相对集中后经升压站升压到66 k V接入到高压配电线路中段,能够有效提升配电线路末端电压。选取吉林省某风电场进行试点,证实了该方案具备实用价值,为更好地提升低压配电网供电能力做出有益尝试。

The low terminal voltage of distribution network is the bottleneck which affects the quality of power supply in local area. First, taking the radial distribution network as an example, this paper analyzes the reasons of low voltage at the end of the distribution line, points out that the low terminal voltage of distribution line is not entirely caused by the lack of reactive power, the transmission active power also leads to terminal voltage drop. Then, combined with the characteristics of wind energy resources in Jilin Province, a scheme is proposed which can raise the voltage at the end of the distribution line based on the distributed wind turbines. The main idea of this scheme concentrates the wind turbines output to the booster station, and then raises the voltage to 66 kV and connects to the middle section of the high voltage distribution line, which can effectively improve the terminal voltage of the distribution lines. The scheme is of practical value and can preferably improve power supply capacity of low-voltage distribution system, which is verified by a demonstration project of a wind plant in Jilin province.