极端负荷方式下的宁波地区电网无功问题研究

Study on reactive problem of ningbo power grid under extreme loads

针对极端负荷方式下宁波地区无功问题造成的电压不稳定现象,从母线电压、功率因素等方面对夏季尖峰负荷和节假日低谷负荷这两种极端负荷方式下的宁波地区电网运行现状进行了分析,对电厂无功出力、变压器分接头、并联电容器等影响电压稳定的关键因素进行了归纳,提出了一种基于BPA的仿真方法,并以夏季尖峰负荷方式为例,通过模拟计算结果与实际运行结果的比对分析对所提方法进行了测试,最后给出了极端负荷方式下宁波地区无功问题的具体解决方案。研究结果表明,模拟计算结果与实际运行结果基本一致,所提解决方案能保证电网各母线电压在极端负荷方式下不越限,从而保持电网电压稳定。

Aiming at solving the voltage instability problem of Ningbo power grid under extreme loads,the operation statuses including bus bar voltage and power factor of Ningbo power grid under peak load in summer and valley load in vocation were analyzed and the critical factors of voltage stability,e. g.,reactive source outputs,transformer taps,parallel capacitors,were concluded. Then,a simulation approach based on BPA（ Bonneville Power Administration） was proposed. Moreover,taking the situation under peak load in summer for example,the simulation results were compared with the real results to validate the proposed method. Finally,the solution to reactive problem of Ningbo power grid under extreme loads was provided. The experiment results indicate that the simulation results and the real results are basically consistent and the bus bar voltages under extreme loads are within a limit when adopting the provided solution which stands for the voltage stability.