基于组播的功率调节系统在光伏电站的应用

针对大容量光伏电站中逆变器数量较多时采用点对点的功率调节方式致使调节速度慢、调节时间长的问题,提出了一种基于组播的功率调节系统。通过UDP组播一次性对全站逆变器下发遥调指令,以提高整个电站的调节速度。详细介绍了功率调节控制系统的结构、控制模式及控制策略。在进行电压无功控制时充分利用逆变器的无功容量替代SVG的功能,大大节约大型光伏电站的成本。该系统已在甘肃金昌振新100 MWp光伏电站中成功应用,算例验证了所述方法的有效性。

Application of power conditioner system based on multicast in photovoltaic power station

To solve the problems of slow regulative speed and long adjustment time by using peer-to-peer power regulation mode in high-capacity photovoltaic power station with numbers of inverters, a power conditioner system based on multicast is proposed, which sends the remote adjustment command to the inverters in the station at once by using UDP multicast to improve the regulative speed. The structure, control method and control strategy of the power conditioner system is introduced. It makes use of the reactive power of the inverters instead of the SVG in the voltage/reactive power control, which reduces the cost of large-scale photovoltaic power station effectively. The system has been successfully used in Jinchang Zhenxin 100 MWp photovoltaic power station in Gansu province and the method proposed is validated.