分布式光伏并网电压和功率因数协调控制策略

Voltage and Power Factor Coordination Control for Distributed Photovoltaic Integration

为应对分布式光伏并网引起的电压越限和功率因数超标问题,提出了一种改进的分布式光伏并网电压和功率因数协调控制策略。该策略包括电压控制策略和功率因数控制策略,电压控制策略采用优先控制光伏发出的无功功率,当无功容量不足时降低有功功率的方法调节并网点电压;功率因数控制策略控制光伏发出的无功功率以调节用户考核点功率因数。针对2种控制策略分别设计了比例积分控制器,最后通过算例,在RT-LAB仿真环境中验证了所提控制策略的有效性。

To deal with the problem of voltage and power factor exceeding limits caused by distributed PV integration,an improved voltage and power factor coordination control strategy of distributed PV is proposed.The strategy includes voltage control strategy and power factor control strategy,voltage control strategy regulates the voltage of integration by controlling PV reactive power firstly and reducing PV reactive power when PV reactive power reach lower limit,power factor control strategy regulates reactive power of PV and power factor of the point of common coupling,proportional integral controller is designed for two control strategies.Finally,an example is given to demonstrate the effectiveness of the proposed control strategy in a RT-LAB simulation environment.