有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)...有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)的方法实现对非理想电网电压条件下网侧电压的处理,得到平衡无畸变的电网电压,并对负载电流处理,得到准确的基波电流正序分量。然后对传统p-q法进行改进,得到了基于MAF-ANF的谐波检测方法,该方法较传统方法谐波检测精度提高,取得了更好的补偿效果。最后通过Simulink仿真证明了在非理想电网电压条件下所提检测算法的正确性和有效性。展开更多
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 model ...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 PI(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
文摘有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)的方法实现对非理想电网电压条件下网侧电压的处理,得到平衡无畸变的电网电压,并对负载电流处理,得到准确的基波电流正序分量。然后对传统p-q法进行改进,得到了基于MAF-ANF的谐波检测方法,该方法较传统方法谐波检测精度提高,取得了更好的补偿效果。最后通过Simulink仿真证明了在非理想电网电压条件下所提检测算法的正确性和有效性。
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 PI(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.