摘要
对于含冲击负荷的配电网,由于其负荷波动性大,导致无功补偿较为困难,对此提出了综合动态无功补偿法,即利用无功裕度的方法确定最佳补偿点,以在线监测补偿点电压作为约束条件控制投切电容器,动态调整补偿容量。对于冲击负荷引起的电压降落,采取就地补偿电容器的方式,同时在电容器上串联一个小容量电抗器,以抑制并联电容器对谐波的放大作用,减小负荷冲击对电网的影响。实例应用结果表明,该方法不仅稳步提升了线路和冲击负荷点电压,且有效保证了电网的电压质量。
For the distribution network with impact load,reactive compensation is a tough problem because of the large load fluctuation.To solve this problem,a comprehensive dynamic reactive power compensation method is proposed in this paper.Firstly,the optimal compensation spot is determined by using the method of reactive power margin.Then the compensation spot voltage is monitored on-line.Based on this,the capacitor is controlled with the voltage monitored as constraint conditions so that the compensation capacity can be adjusted dynamically.Besides,concerning the voltage drop made by the impact load,the method of local compensation of the capacitor is taken use of.To restrain the amplification of the harmonic made by the parallel capacitor,a small capacity reactor is installed in series with the capacitor.This method has been applied in a certain area power grid.In consequence,the voltages of the lines and the impact load spots are raised steadily and the voltage quality of the grid is guaranteed effectively.
出处
《水电能源科学》
北大核心
2015年第1期186-189,193,共5页
Water Resources and Power
基金
教育部科学技术研究项目(113023A)
关键词
冲击负荷
配电系统
综合动态无功补偿
无功裕度
就地补偿
谐波抑制
impact load
distribution network
comprehensive dynamic reactive power compensation
reactive power margin
local compensation
harmonic restraining
