三相无锁相环单次谐波检测法
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摘要
传统的单次谐波检测法存在计算精度过分依赖锁相环锁相性能的问题,当电网电压出现畸变时,锁相环就会得到错误的相位,为此提出了一种三相无锁相环单次谐波检测法.该方法通过数学分析得到电源电压的正序分量,进而得到正确的电压相位信息,代替并优化了锁相环的功能,并在原理分析的基础上验证了改进的单次谐波检测法在三相电压畸变情况下的可行性.利用PSCAD/EMTDC仿真平台,对三相无锁相环单次谐波检测法的检测精度进行了验证.在理论分析和仿真研究的基础上搭建了实验平台,实验结果进一步证明了该检测方法的可靠性.
The accuracy of traditional single harmonic detection method performs overdependency performance of PLL. When the network voltage distorts, the PLL will get wrong phase information. In this paper, a three-phase single harmonic detection method without phase locked loop is proposed to address this problem. By distinguishing the positive sequence components of the supply voltage by means of mathematical analysis,the voltage phase information can be precisely obtained. This method performs optimizes the function of PLL. In addition, the feasibility of the improved single harmonic detection method under the condition of three-phase voltage distortion is verified by principal analysis. And the detection accuracy of single phase harmonic detection without phase locked loop is simulated on PSCAD/EMTDC simulation plattorm. Finally, an experimental platform is built and experimental results prove the reliability of the proposed method.
The accuracy of traditional single harmonic detection method performs overdependency performance of PLL. When the network voltage distorts, the PLL will get wrong phase information. In this paper, a three-phase single harmonic detection method without phase locked loop is proposed to address this problem. By distinguishing the positive sequence components of the supply voltage by means of mathematical analysis,the voltage phase information can be precisely obtained. This method performs optimizes the function of PLL. In addition, the feasibility of the improved single harmonic detection method under the condition of three-phase voltage distortion is verified by principal analysis. And the detection accuracy of single phase harmonic detection without phase locked loop is simulated on PSCAD/EMTDC simulation plattorm. Finally, an experimental platform is built and experimental results prove the reliability of the proposed method.
引文
[1]罗安,吴传平,彭双剑.谐波治理技术现状及其发展[J].大功率变流技术,2011(6):1-5.Luo A, Wu C P, Peng S J. Present situation and development of harmonic control technology[J]. High Power Converter Technology, 2011(6):1-5.(in Chinese)
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[4]杨韬,帅智康,兰征,周柯,涂春鸣,盘宏斌.直流电压不平衡下的单相级联PWM整流器无锁相环均压控制[J].电网技术,2015, 39(4):1167-1172.Yang T, Shuai Z K, Lan Z, Zhou K, Tu C M, Pan H B. Voltage-sharing control of singlephase cascaded PWM rectifier without phase-lock loop under unbalanced DC voltage condition[J].Power System Technology, 2015, 39(4):1167-1172.(in Chinese)
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[8]苏刘军,鲁宝春,李昌超,李兴进,刘飞.一种改进的无锁相环三相电压波动检测方法[J].电力系统保护与控制,2014, 42(8):121-126.Su L J, Lu B C, Li C C, Li X J, Liu F. An improved method for detecting three-phase voltage fluctuation without phase locked loop[J]. Power System Protection and Control, 2014,42(8):121-126.(in Chinese)
[9]李文娟,吴天强,绳燕.有源滤波器单次谐波正负序统一检测法[J].哈尔滨理工大学学报,2016,21(3):13-18.Li W J, Wu T Q, Sheng Y. Single harmonic positive and negative sequence unified detection method for active filter[J]. Journal of Harbin University of Science and Technology, 2016, 21(3):13-18.(in Chinese)
[10]张树全,戴珂,谢斌,余蜜,康勇.多同步旋转坐标系下指定次谐波电流控制[J].中国电机工程学报,2010, 30(3):55-62.Zhang S Q, Dai K, Xie B, Yu M, Kang Y. Subharmonic current control in a multisynchronous rotating coordinate system[J]. Proceedings of the CSEE, 2010, 30(3):55-62.(in Chinese)
[11]杨柳,刘会金,陈允平.三相四线制系统任意次谐波电流的检测新方法[J].中国电机工程学报,2005,25(13):41-44.Yang L, Liu H J, Chen Y P. A new algorithm for random harmonic current detection in three phase four wire system[J]. Proceedings of the CSEE, 2005, 25(13):41-44.(in Chinese)
[12]雷芸,肖岚,郑昕昕.不平衡电网下无锁相环三相并网逆变器控制策略[J].中国电机工程学报,2015,35(18):4744-4752.Lei Y, Xiao L, Zheng X X. Control strategies of three-phase grid-connected inverters without phase-lock loop under unbalanced grids[J]. Proceedings of the CSEE, 2015, 35(18):4744-4752.(in Chinese)
[13]吕晓琴,张秀峰,章春军.无锁相环单相电路谐波及无功电流综合检测新方法[J].电力系统保护与控制,2010, 38(6):45-48.LüX Q, Zhang X F, Zhang C J. New detecting method of harmonics and reactive currents in single circuit without phase lock loop[J]. Power System Protection and Control, 2010, 38(6):45-48.(in Chinese)
[14]周林,张凤,栗秋华,徐明.三相四线制任意次谐波电流的无锁相环ip-iq检测新方法[J].继电器,2006, 34(20):57-62.Zhou L, Zhang F, Shu Q H, Xu M. A new method without phase locked loop ip-iq for detecting arbitrary harmonic currents in three-phase four wire system[J]. Relay, 2006, 34(20):57-62.(in Chinese)
[15]戴列峰,蒋平,田大强.无锁相环d-q谐波电流检测法的实现[J].电网技术,2003, 27(8):46-49.Dai L F, Jiang P, Tian D Q. Realization harmonic current detection of d-q method without phase-locked loop[J]. Power System Technology, 2003, 27(8):46-49.(in Chinese)
[2]陆康,刁倩.有源滤波器在不同网络中的应用分析[J].电力系统保护与控制,2015, 43(3):143-149.Lu K, Diao Q. Analysis of active power filter applications in different networks[J]. Power System Protection and Control, 2015, 43(3):143-149.(in Chinese).
[3]周文,段晓波,胡文平,温从溪.混合有源与无源滤波器的配合及控制研究[J].高电压技术,2016,42(4):1308-1315.Zhou W, Duan X B, Hu W P, Wen C X. Study on the coordination and control of hybrid active and passive filters[J]. High Voltage Technology, 2016, 42(4):1308-1315.(in Chinese)
[4]杨韬,帅智康,兰征,周柯,涂春鸣,盘宏斌.直流电压不平衡下的单相级联PWM整流器无锁相环均压控制[J].电网技术,2015, 39(4):1167-1172.Yang T, Shuai Z K, Lan Z, Zhou K, Tu C M, Pan H B. Voltage-sharing control of singlephase cascaded PWM rectifier without phase-lock loop under unbalanced DC voltage condition[J].Power System Technology, 2015, 39(4):1167-1172.(in Chinese)
[5]田铭兴,阎宏,赵雨欣.基于无锁相环的电气化铁道功率平衡装置电流检测方法的研究[J].电力系统保护与控制,2013, 41(16):78-84.Tian M X, Yan H, Zhao Y X. Current detection method based on no phase-locked loop for electrified railway power balance device[J]. Power System Protection and Control, 2013, 41(16):78-84.(in Chinese)
[6]吴丽然,吴命利.单相无锁相环单次谐波电流检测方法[J].北京交通大学学报,2015, 39(5):32-38.Wu L R,Wu M L. Single phase non-phase locked loop single harmonic current detection method[J]. Journal of Beijing Jiaotong University, 2015, 39(5):32-38.(in Chinese)
[7]周福林,李群湛,解绍峰,郭成.无锁相环单相无功谐波电流实时检测方法[J].电工技术学报,2010,25(1):178-182.Zhou F L, Li Q Z, Xie S F, Guo C. Real time detecting method of single-phase reactive harmonic current without phase locked loop[J]. Transactions of China Electrotechnical Society,2010, 25(1):178-182.(in Chinese)
[8]苏刘军,鲁宝春,李昌超,李兴进,刘飞.一种改进的无锁相环三相电压波动检测方法[J].电力系统保护与控制,2014, 42(8):121-126.Su L J, Lu B C, Li C C, Li X J, Liu F. An improved method for detecting three-phase voltage fluctuation without phase locked loop[J]. Power System Protection and Control, 2014,42(8):121-126.(in Chinese)
[9]李文娟,吴天强,绳燕.有源滤波器单次谐波正负序统一检测法[J].哈尔滨理工大学学报,2016,21(3):13-18.Li W J, Wu T Q, Sheng Y. Single harmonic positive and negative sequence unified detection method for active filter[J]. Journal of Harbin University of Science and Technology, 2016, 21(3):13-18.(in Chinese)
[10]张树全,戴珂,谢斌,余蜜,康勇.多同步旋转坐标系下指定次谐波电流控制[J].中国电机工程学报,2010, 30(3):55-62.Zhang S Q, Dai K, Xie B, Yu M, Kang Y. Subharmonic current control in a multisynchronous rotating coordinate system[J]. Proceedings of the CSEE, 2010, 30(3):55-62.(in Chinese)
[11]杨柳,刘会金,陈允平.三相四线制系统任意次谐波电流的检测新方法[J].中国电机工程学报,2005,25(13):41-44.Yang L, Liu H J, Chen Y P. A new algorithm for random harmonic current detection in three phase four wire system[J]. Proceedings of the CSEE, 2005, 25(13):41-44.(in Chinese)
[12]雷芸,肖岚,郑昕昕.不平衡电网下无锁相环三相并网逆变器控制策略[J].中国电机工程学报,2015,35(18):4744-4752.Lei Y, Xiao L, Zheng X X. Control strategies of three-phase grid-connected inverters without phase-lock loop under unbalanced grids[J]. Proceedings of the CSEE, 2015, 35(18):4744-4752.(in Chinese)
[13]吕晓琴,张秀峰,章春军.无锁相环单相电路谐波及无功电流综合检测新方法[J].电力系统保护与控制,2010, 38(6):45-48.LüX Q, Zhang X F, Zhang C J. New detecting method of harmonics and reactive currents in single circuit without phase lock loop[J]. Power System Protection and Control, 2010, 38(6):45-48.(in Chinese)
[14]周林,张凤,栗秋华,徐明.三相四线制任意次谐波电流的无锁相环ip-iq检测新方法[J].继电器,2006, 34(20):57-62.Zhou L, Zhang F, Shu Q H, Xu M. A new method without phase locked loop ip-iq for detecting arbitrary harmonic currents in three-phase four wire system[J]. Relay, 2006, 34(20):57-62.(in Chinese)
[15]戴列峰,蒋平,田大强.无锁相环d-q谐波电流检测法的实现[J].电网技术,2003, 27(8):46-49.Dai L F, Jiang P, Tian D Q. Realization harmonic current detection of d-q method without phase-locked loop[J]. Power System Technology, 2003, 27(8):46-49.(in Chinese)