摘要
针对大规模光伏电站在电网故障或扰动时突然脱网造成的严重后果,提出了一种光伏电站低电压穿越(Low Voltage Ride Through,LVRT)控制策略,详细分析了基于正负序同步旋转坐标系的并网逆变器控制策略以及LVRT有功电流和无功电流协调控制的实现方法。以单相电压跌落故障为例,进行了仿真和实验研究,结果表明所提出的控制策略不仅能保证并网逆变器在电压跌落期间输出不过流,而且能够向电网发出一定的无功功率以支撑并网点电压的恢复,实现低电压穿越。
In view of the serious consequences caused by the off-the-grid at large-scale photovoltaic power plants when grid failure or disturbance takes place, a control strategy based on low voltage ride through （LVRT） of the photovolta- ic power plant was proposed. The control strategy of the grid-connect6d inverter based on the positive and negative se- quence synchronous rotating coordinate and the implementation of the coordination control of the LVRT active and re- active current were analyzed in detail. Then simulation and experiments were carried out with the single-phase voltage sag fault as the example. The results showed that the proposed control strategy could not only ensure overcurrent would not happen to current output of the grid-connected inverter during voltage sag, but also send a certain amount of reac- tive power to the grid to support the recovery of the grid voltage, so as to realize the capability of low voltage ride through.
出处
《电测与仪表》
北大核心
2015年第8期61-66,共6页
Electrical Measurement & Instrumentation
基金
"本科教学工程"国家级大学生创新创业训练计划(201310290067)
关键词
光伏电站
低电压穿越
正负序同步旋转坐标系
协调控制
单相电压跌落故障
photovoltaic power plant, low vohage ride through （ LVRT）, positive and negative sequence synchronousrotating coordinate, coordination control, single-phase voltage sag fault
