基于新型统一电能质量控制器的光伏电站故障穿越技术

近年来,光伏电站低电压穿越技术得到了快速发展,但受限于光伏并网系统电压检测速度影响,光伏电站故障穿越的快速性等问题亟需解决。文中提出一种适用于光伏电站故障穿越的的新型统一电能质量控制器(UPQC)接入结构及控制方法。该型UPQC能够在高电压故障时,通过补偿使光伏电站出口电压稳定在额定值,系统具备高电压穿越的能力,并兼有谐波补偿功能,有助于光伏电站快速响应电网电压波动情况,提升光伏电站故障穿越能力。UPQC可以配合光伏电站在低电压故障时输出无功功率,帮助光伏电站在指定的时间内发出电网需要的无功功率,并且能够在高电压故障时吸收电网无功功率,加速电网电压恢复过程,综合提升光伏电站穿越能力。最后,文中给出100 MW光伏电站运行仿真结果,验证了所提电力电子补偿系统的有效性和可行性。

A novel unified power quality conditioner for the fault ride-through operation of photovoltaic power station

A novel unified power quality conditioner (UPQC)and its control strategy for the fault ride-through operation of photovoltaic (PV)power station is present in this paper.The output voltage of PV station can be controlled to its rated value with the novel compensator under high grid voltage condition.The compensator could also compensate the grid harmonic voltage under various operation conditions, which can minimize the response time of phase-locked-loops embedded in the control loop of grid-tied PV inverter.The compensator helps the PV station output reactive power for enhancing the low voltage ride through performance.Moreover it absorbs reactive power from the grid in high voltage condition to support the grid voltage recovery, which could comprehensively improve the fault ride-through operation of photovoltaic power station.Furthermore, the performance of proposed compensator system with a 100 MW grid-tied PV station has been verified by Matlab/Simulink.