基于无功功率控制的光伏逆变器电压调节策略研究

Research on the voltage regulation strategy of photovoltaic inverter based on reactive power control

为解决光伏配电系统运行中的电压不平衡问题,提出了一种基于无功功率控制的光伏逆变器电压调节方法。首先,使用光伏逆变器吸收或注入无功功率,将无功功率作为电压函数控制电压幅值,解决电压不平衡问题。然后,将电压不平衡度保持在限定值以下,即将电压变化幅度保持在标准范围内。最后,通过IEEE 37节点系统配合使用真实光伏发电和负载需求数据进行仿真测试,验证了所提方法的实际性能。实验结果表明,所提方法能够有效地将节点处电压变化幅度控制在电压不平衡阈值内,并显著降低住宅光伏逆变器的运行压力,促进配电系统提升光伏发电能力。

To solve the voltage unbalance problem in the operation of photovoltaic power distribution system,a voltage regulation method of photovoltaic inverter based on reactive power control is proposed.Firstly,by using the photovoltaic inverter to absorb or inject reactive power,the reactive power is used as a function of voltage to control voltage amplitude and voltage imbalance.Secondly,the voltage unbalance is kept below the specified limit to keep the voltage amplitude within the standard range.Finally,the IEEE 37-bus system and real photovoltaic power generation and load demand data are used for simulation tests to verify the actual performance of the proposed method.The experimental results show that the proposed method can effectively control the voltage amplitude at the node within the voltage unbalance threshold,significantly reduce the operating pressure of residential photovoltaic inverters,and promote the distribution system to increase photovoltaic power generation capacity.