本文针对不平衡及畸变电网下光伏逆变器的控制问题,首先从获取电网基波幅值、相位信息出发,设计了基于二阶广义积分器(second order generalized integrator,SOGI)的锁相功能模块,并通过实验证明其在不平衡或畸变电网下能快速、准确地...本文针对不平衡及畸变电网下光伏逆变器的控制问题,首先从获取电网基波幅值、相位信息出发,设计了基于二阶广义积分器(second order generalized integrator,SOGI)的锁相功能模块,并通过实验证明其在不平衡或畸变电网下能快速、准确地获得电压正序分量的幅值和相位。然后,为实现畸变及不平衡电网下并网电流的高品质控制,设计了PI并联重复控制器的复合控制系统。最后,利用PSCAD搭建出光伏逆变器并网系统仿真模型,仿真结果证明了本文所设计方案的正确性。展开更多
This paper presents a multiple target implementation technique for a doubly fed induction generator （DFIG） under unbalanced and distorted grid voltage based on direct power control （DPC）. Based on the mathematical...This paper presents a multiple target implementation technique for a doubly fed induction generator （DFIG） under unbalanced and distorted grid voltage based on direct power control （DPC）. Based on the mathematical model of DFIG under unbalanced and distorted voltage, the proportional and integral （PI） regulator is adopted to regulate the DFIG average active and reactive powers, while the vector P1 （VPI） resonant regulator is used to achieve three alternative control targets： （1） balanced and sinusoidal stator current; （2） smooth instantaneous stator active and reactive powers; （3） smooth electromagnetic torque and instantaneous stator reactive power. The major advantage of the proposed control strategy over the conventional method is that neither negative and harmonic sequence decomposition of grid voltage nor complicated control reference calculation is required. The insensitivity of the proposed control strategy to DFIG parameter deviation is analyzed. Finally, the DFIG experimental system is developed to validate the availability of the proposed DPC strategy under unbalanced and distorted grid voltage,展开更多
文摘本文针对不平衡及畸变电网下光伏逆变器的控制问题,首先从获取电网基波幅值、相位信息出发,设计了基于二阶广义积分器(second order generalized integrator,SOGI)的锁相功能模块,并通过实验证明其在不平衡或畸变电网下能快速、准确地获得电压正序分量的幅值和相位。然后,为实现畸变及不平衡电网下并网电流的高品质控制,设计了PI并联重复控制器的复合控制系统。最后,利用PSCAD搭建出光伏逆变器并网系统仿真模型,仿真结果证明了本文所设计方案的正确性。
基金Project supported by the National High-Tech R&D Program(863)of China(No.2011AA050204)the National Natural Science Foundation of China(No.51277159)
文摘This paper presents a multiple target implementation technique for a doubly fed induction generator （DFIG） under unbalanced and distorted grid voltage based on direct power control （DPC）. Based on the mathematical model of DFIG under unbalanced and distorted voltage, the proportional and integral （PI） regulator is adopted to regulate the DFIG average active and reactive powers, while the vector P1 （VPI） resonant regulator is used to achieve three alternative control targets： （1） balanced and sinusoidal stator current; （2） smooth instantaneous stator active and reactive powers; （3） smooth electromagnetic torque and instantaneous stator reactive power. The major advantage of the proposed control strategy over the conventional method is that neither negative and harmonic sequence decomposition of grid voltage nor complicated control reference calculation is required. The insensitivity of the proposed control strategy to DFIG parameter deviation is analyzed. Finally, the DFIG experimental system is developed to validate the availability of the proposed DPC strategy under unbalanced and distorted grid voltage,
