关键词: 分布式光伏, 炼化企业, 功率因数, 区域用电负荷, 电容器, 逆变器, 无功补偿

Abstract:

In response to the problem of power factor non-compliance caused by different directions of active and reactive power flow after photovoltaic integration in a certain refining and chemical enterprise, and considering the actual situation of the enterprise, two solutions are proposed: capacitor shifting and coordinated control of photovoltaic inverters and capacitors. The results show that when using capacitors to compensate for reactive power, the output is a step type reactive power, there is a possibility of reactive power backflow and still a problem of different directions of active and reactive power flow. When the photovoltaic fluctuation is large, capacitors need to be switched step by step, resulting in slow response speed; when using coordinated control of photovoltaic inverters and capacitors, the power factor of the photovoltaic inverter is set to 0.98, the capacitors do not need to switch frequently, the reactive power compensation response speed is fast, there are no power flow problems, and the regional power factor meets the control requirement of 0.92. By comparing the analysis results of the two schemes, it is found that using coordinated control of photovoltaic inverters and capacitors makes power factor adjustment more convenient and reliable.

Key words: distributed photovoltaic, refining and chemical enterprises, power factor, regional electricity load, capacitor, inverter, reactive power compensation