According to performance analysis of a three-phase grid-connected inverter mathematical model of a directly-driven wind turbine with a permanent magnet synchronous generator (D-PMSG) under unbalanced network voltage c...According to performance analysis of a three-phase grid-connected inverter mathematical model of a directly-driven wind turbine with a permanent magnet synchronous generator (D-PMSG) under unbalanced network voltage conditions, a dual current-loop control strategy (DCC) oriented on positive voltage and negative current is proposed to inhibit the DC voltage fluctuation. Meanwhile, a notch filter is introduced into the conventional control strategy of a phase-locked loop to complete the low voltage ride through (LVRT) ability of the wind generator. A 1.5-MW D-PMSG with a back-to-back IGBT frequency converter was simulated in the PSCAD/EMTDC environment, and simulation results showed that: the maximum wind power tracking was achieved in this system and the proposed DCC strategy could successfully inhibit the rising aging of DC voltage and enhance the ride-through capability of D-PMSG wind generation system under unbalanced network voltage conditions.展开更多
有源电力滤波器(active power filter,APF)是一种动态抑制谐波和无功的电力电子装置,以并联型有源电力滤波器为研究对象,从APF补偿电流的控制和直流侧电容电压角度出发,分析了电源电流控制方式,实现补偿电流的检测及双闭环反馈控制,提...有源电力滤波器(active power filter,APF)是一种动态抑制谐波和无功的电力电子装置,以并联型有源电力滤波器为研究对象,从APF补偿电流的控制和直流侧电容电压角度出发,分析了电源电流控制方式,实现补偿电流的检测及双闭环反馈控制,提高系统的补偿精确度和动态响应性能。另外,直流侧电压的指令值都是根据电网电压的工作范围、APF的直流侧电容、额定输出电流、PWM逆变器输出侧电感、电流电压调节器以及调制策略等参数设计的,在考虑直流侧电压与APF功率损耗和补偿性能关系的基础上,提出了采用下垂调节器设计逆变器直流侧电压的控制参考值,使其兼顾APF的功率损耗及补偿性能综合平衡的优点。仿真结果验证了该APF控制系统的正确性和有效性。展开更多
文摘According to performance analysis of a three-phase grid-connected inverter mathematical model of a directly-driven wind turbine with a permanent magnet synchronous generator (D-PMSG) under unbalanced network voltage conditions, a dual current-loop control strategy (DCC) oriented on positive voltage and negative current is proposed to inhibit the DC voltage fluctuation. Meanwhile, a notch filter is introduced into the conventional control strategy of a phase-locked loop to complete the low voltage ride through (LVRT) ability of the wind generator. A 1.5-MW D-PMSG with a back-to-back IGBT frequency converter was simulated in the PSCAD/EMTDC environment, and simulation results showed that: the maximum wind power tracking was achieved in this system and the proposed DCC strategy could successfully inhibit the rising aging of DC voltage and enhance the ride-through capability of D-PMSG wind generation system under unbalanced network voltage conditions.
文摘有源电力滤波器(active power filter,APF)是一种动态抑制谐波和无功的电力电子装置,以并联型有源电力滤波器为研究对象,从APF补偿电流的控制和直流侧电容电压角度出发,分析了电源电流控制方式,实现补偿电流的检测及双闭环反馈控制,提高系统的补偿精确度和动态响应性能。另外,直流侧电压的指令值都是根据电网电压的工作范围、APF的直流侧电容、额定输出电流、PWM逆变器输出侧电感、电流电压调节器以及调制策略等参数设计的,在考虑直流侧电压与APF功率损耗和补偿性能关系的基础上,提出了采用下垂调节器设计逆变器直流侧电压的控制参考值,使其兼顾APF的功率损耗及补偿性能综合平衡的优点。仿真结果验证了该APF控制系统的正确性和有效性。