一种双正弦幅值积分器解耦锁相环的设计
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摘要
针对在电网三相电压不平衡时传统锁相环不能准确检测基波正序相位的问题,设计了一种双正弦幅值积分器解耦锁相环(decoupled double sinusoidal amplitude integrator phase-locked loop,DDSAI-PLL)。该锁相环利用正弦幅值积分器的频率选择特性,在αβ坐标系下采用正负序解耦结构实现了正序分量的完全提取。同时引入一阶负反馈系统作为频率自适应环节,使锁相环在电网频率发生偏移时仍然可以对基波正序频率进行准确估计。建立了DDSAI-PLL的数学模型,并对其关键参数进行了设计。最后使用DSP实现该锁相环,并在电压畸变条件下与传统的同步参考坐标系锁相环(SRF-PLL)进行了对比实验,结果证明了所提锁相方法的有效性。
Under conditions of the distorted grid,the traditional phase-locked loop(PLL) cannot accurately extract fundamental positive sequence. For the problem,a decoupled double sinusoidal amplitude integrator phase-locked loop(DDSAI-PLL) is designed. DDSAI-PLL uses a crossing decoupling structure based on sine amplitude integrator(SAI),to achieve the separation of positive and negative sequence components. And the introduction of frequency adaptive module makes DDSAI-PLL have the phase frequency adaptive ability. The working principle of DDSAI-PLL is introduced,its mathematical model is established,and the key parameters are analyzed. Finally,DDSAI-PLL is realized by using DSP and is compared with the traditional synchronous reference frame phase locked loop(SRF-PLL) under the condition of voltage distortion. The results show that the proposed method is effective.
Under conditions of the distorted grid,the traditional phase-locked loop(PLL) cannot accurately extract fundamental positive sequence. For the problem,a decoupled double sinusoidal amplitude integrator phase-locked loop(DDSAI-PLL) is designed. DDSAI-PLL uses a crossing decoupling structure based on sine amplitude integrator(SAI),to achieve the separation of positive and negative sequence components. And the introduction of frequency adaptive module makes DDSAI-PLL have the phase frequency adaptive ability. The working principle of DDSAI-PLL is introduced,its mathematical model is established,and the key parameters are analyzed. Finally,DDSAI-PLL is realized by using DSP and is compared with the traditional synchronous reference frame phase locked loop(SRF-PLL) under the condition of voltage distortion. The results show that the proposed method is effective.
引文
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[2]陈东明,陈明亮,谢桢,等.一种基于阀值开关与双环控制的新型锁相环[J].电力系统保护与控制,2015,43(23):41-48.CHEN Dongming,CHEN Mingliang,XIE Zhen,et al.A novel PLL based on threshold switch and dual-loop control technology[J].Power System Protection and Control,2015,43(23):41-48.
[3]丁恒春,杨晓波,钱吉红,等.基于d SPACE的光伏并网系统实时仿真[J].陕西电力,2015,43(12):21-26.DING Hengchun,YANG Xiaobo,QIAN Jihong,et al.Real-time simulation of photovoltaic grid-connected system based on d SPACE[J].Shaanxi Electric Power,2015,43(12):21-26.
[4]杜佳玮,杨鹏,史旺旺.考虑频率变化的基于DFT单相数字锁相环的椭圆拟合方法[J].电力系统保护与控制,2015,43(10):85-90.DU Jiawei,YANG Peng,SHI Wangwang.A novel single-phase digital phase-locked loop based on DFT considering frequency variation[J].Power System Protection and Control,2015,43(10):85-90.
[5]丁雅琦,古雯雯.基于模块化多电平换流器的DSTATCOM控制策略仿真研究[J].陕西电力,2015,43(3):67-71.DING Yaqi,GU Wenwen.Simulation study on control strategies of dstatcom based on modular multilevel converter[J].Shaanxi Electric Power,2015,43(3):67-71.
[6]CHUNG S K.A phase tracking system for three phase utility interface inverters[J].IEEE Transactions on Power Electronics,2000,15(3):431-438.
[7]袁旭峰,程时杰,文劲宇.改进瞬时对称分量法及其在正负序电量检测中的应用[J].中国电机工程学报,2008,28(1):52-58.YUAN Xufeng,CHENG Shijie,WEN Jinyu.An improved method of instantaneous symmetrical components and its detection for positive and negative sequence current[J].Proceedings of the CSEE,2008,28(1):52-58.
[8]TONG L,ZOU X D,FENG S S,et al.An SRF-PLLbased sensorless vector control using the predictive deadbeat algorithm for the direct-driven permanent magnet synchronous generator[J].IEEE Transactions on Power Electronics,2014,29(29):2837-2849.
[9]YOUNG K,DOUGAL R A.SRF-PLL with dynamic center frequency for improved phase detection[C]//International Conference on Clean Electrical Power,2009:212-216.
[10]RODRíGUEZ P,POU J,BERGAS J,et al.Decoupled double synchronous reference frame PLL for power converters control[J].IEEE Transactions on Power Electronics,2007,22(2):584-592.
[11]RODRIGUEZ P,LUNA A,CIOBOTARU M,et al.Advanced grid synchronization system for power converters under unbalanced and distorted operating conditions[J].Electrical Engineering/electronics Computer Communications&Information Technology Association,2006:5173-5178.
[12]DE SOUZA H E P,BRADASCHIA F,NEVES F A S,et al.A method for extracting the fundamental-frequency positive-sequence voltage vector based on simple mathematical transformations[J].IEEE Transactions on Industrial Electronics,2009,56(5):1539-1547.
[13]陈国栋,朱淼,蔡旭,等.一种软件锁相环和电压跌落检测新算法[J].中国电机工程学报,2014,34(25):4385-4394.CHEN Guodong,ZHU Miao,CAI Xu,et al.A new algorithm for software phase locked-loop and voltage sag detection[J].Proceedings of the CSEE,2014,34(25):4385-4394.
[14]杜雄,王国宁,孙鹏菊,等.采用正弦幅值积分器的电网基波电压同步信号检测[J].中国电机工程学报,2013,33(36):104-111.DU Xiong,WANG Guoning,SUN Pengju,et al.Synchronization signal detection for grid fundamental voltage through employing sinusoidal amplitude integrators[J].Proceedings of the CSEE,2013,33(36):104-111.
[15]MARTIN K W.Complex signal processing is notcomplex[C]//Solid-State Circuits Conference,2003.ESSCIRC'03.Proceedings of the 29th European.2003:3-14.
[16]刘延东.基于正弦幅值积分器的单同步坐标系同步信号提取策略[D].重庆:重庆大学,2014:17-21.LIU Yandong.Estimation of synchronization signal using sinusoidal amplitude integrators in synchronous reference frame[D].Chongqing:Chongqing University,2014:17-21.