ADS并网点电压越限逆变器控制策略研究

Research on Inverter Control Strategy to Prevent the Overvoltage of Active Distribution System Point of Common Coupling

随着分布式电源(DG)逐渐接入配电网,对主动配电网电压质量和稳定性的影响也在逐渐增加。首先分析了DG并网造成主动配电网并网点电压越限现象的机理,以配置储能装置的DG并网系统为基础,提出了一种逆变器有功/无功综合控制策略。在无功控制部分设计死区控制环节,在并网点电压越限值较低时,首先减小有功出力,将多余的电能存入储能设备;电压越限值较大时,在调整有功出力的同时,利用逆变器吸收感性无功,有功/无功综合控制,降低并网点电压。最后通过实验验证了所提控制策略的可行性和有效性。

As the distributed generation （DG） is gradually connected to the distribution network, the influence of the voltage quality and stability of the distribution network is gradually increasing.The reason of overvohage phenomenon at grid-connected point caused by grid-connected with DG is analyzed, and an active/reactive power integrated control strategy based on DG grid-connected system with energy storage device is proposed.Dead zone is set in reactive pow- er voltage control loop.The active power is reduced firstly when the threshold value of the grid voltage is lower,and the excess energy storage device is stored into energy storage equipment when the voltage is lower at grid-connected point.When the voltage is larger,the inductive reactive power is absorbed by the inverter while the active power is adjusted.The grid voltage is reduced by active/reactive power integrated control strategy to reduce the grid voltage.Finally, the feasibility and effectiveness of the control strategy is verified by experiments.