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采用瞬时功率理论,对电网电压功率进行了实时精确计算和检测,根据电网电压跌落的深度,决定是否投入STATCOM模式和卸荷电路,并且对其进行实时动态控制。对瞬时功率理论的原理进行了详细的阐述,低电压穿越时功率控制策略和算法进行了分析推导。仿真结果表明,电网电压故障时使直驱风电系统运行在基于瞬时功率理论的STATCOM模式可以有效提高低电压穿越能力。
According to the instantaneous power theory, the grid voltage power is accurately calculated and detected in real time. According to the depth of grid voltage drop, we decide whether to put into STATCOM mode or unload circuit and control it in real time. The principle of instantaneous power theory is described in detail. The power control strategies and algorithms for low voltage ride through are analyzed and derived. The simulation results show that the STATCOM mode based on instantaneous power theory can effectively improve the low voltage ride through capability when the grid voltage is faulty.