含多小水电的配电网电压分析与控制策略研究

Research on Analysis and Strategy of Voltage in Distribution Networks with Multi-Small Hydropower

摘要: 小水电以分布式发电的形式在配电网并网发电，改变了传统的配电网的运行方式，引起配电网枯水期电压偏低、丰水期电压偏高、线路末端电压随季节波动较大等问题。本文对含小水电配电网电压问题分析得出，小水电的接入使配电网从无源网络变为有源网络，由原来的单向潮流变为双向潮流，当丰水期小水电发电量较大时潮流反送到主网中，引起配电网电压升高。同时提出了通过改变网络结构并结合并联补偿的方法对电压进行控制，改善配电网的电压质量。

Abstract: Traditional operation mode of distribution network was altered with the integration of small hy-dropower in it, which causes the problem that the voltage of distribution network drops in dry season, increases in wet season, and the voltage fluctuates greatly with seasons especially at the end of the line. Analysis on voltage problem in distribution network in this paper draws the conclusion that in wet season, the voltage rises since the power flow contrary sends to the main network when the small hydropower station’s generating capacity increases. This paper also presents a method of voltage control by changing the distribution network structure, combining the method of installing parallel compensating devises, which can improve the quality of voltage in distribution network.