采用CDSC滤波实现网侧有功电流前馈的APF无谐波检测控制
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摘要
用无谐波检测法控制有源电力滤波器(active power filter,APF)省去了谐波检测环节,减少了计算量,但传统的无谐波检测法存在APF直流电压随负荷变化而波动严重的缺点。为此,该文基于对传统无谐波检测法直流电压波动机理的分析,提出利用网侧正序有功电流前馈来提高无谐波检测法下APF直流电压的动态响应特性,从而抑制直流电压波动的改进方案。为简化该方案在静止坐标系下的实现,选用并设计了级联延迟信号对消(cascaded delayed signal cancellation,CDSC)滤波器来获取基波正序电流信号。由于稳态的网侧电流与电压相位相同,据此设计了有功逼近算法代替传统有功电流计算方法。仿真和实验验证了改进方案的有效性。与传统无谐波检测法相比,改进方案加快了直流电压恢复速度,提高了负荷电流波动时直流电压稳定性,降低了APF损耗和网侧电流不平衡度。
Non-harmonic detection control method applied to active power filter(APF) has advantages of elimination of harmonic detection link and reduction of computation burden, but it brings disadvantage of DC voltage fluctuations with load changes. In this paper, based on fluctuation mechanism analysis of APF DC-link voltage under conventional scheme, a modified scheme of improving dynamic response characteristics is proposed to suppress DC-link voltage fluctuations by adding forward-feed of grid fundamental positive sequence current to original control loop. In order to simplify implementation of the proposed scheme in α-β frame, a cascaded delayed signal cancellation(CDSC) filter is designed to obtain fundamental positive sequence current signals. In addition, as steady-state grid currents and voltages share the same phase signal, active power current calculations are replaced with an approximation algorithm. Validity of the proposed scheme is verified via simulations and experiments. Compared with conventional non-harmonic detection control method, DC-link voltage restoration is accelerated and its stability is enhanced in the proposed scheme, and power consumptions of APF and source current unbalance factor are reduced as well.
Non-harmonic detection control method applied to active power filter(APF) has advantages of elimination of harmonic detection link and reduction of computation burden, but it brings disadvantage of DC voltage fluctuations with load changes. In this paper, based on fluctuation mechanism analysis of APF DC-link voltage under conventional scheme, a modified scheme of improving dynamic response characteristics is proposed to suppress DC-link voltage fluctuations by adding forward-feed of grid fundamental positive sequence current to original control loop. In order to simplify implementation of the proposed scheme in α-β frame, a cascaded delayed signal cancellation(CDSC) filter is designed to obtain fundamental positive sequence current signals. In addition, as steady-state grid currents and voltages share the same phase signal, active power current calculations are replaced with an approximation algorithm. Validity of the proposed scheme is verified via simulations and experiments. Compared with conventional non-harmonic detection control method, DC-link voltage restoration is accelerated and its stability is enhanced in the proposed scheme, and power consumptions of APF and source current unbalance factor are reduced as well.
引文
[1]王广柱.有源电力滤波器谐波及无功电流检测的不必要性(一)[J].电工技术学报,2007,22(1):137-141,148.Wang Guangzhu.The unnecessaries of harmonic and reactive current detection for active power filters:Part I[J].Transactions of China Electrotechnical Society,2007,22(1):137-141,148(in Chinese).
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[4]Ribeiro R L,Rocha T O,De-Sousa R M,et al.A robust DC-link voltage control strategy to enhance the performance of shunt active power filters without harmonic detection schemes[J].IEEE Transactions on Industrial Electronics,2015,62(2):803-813.
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[6]钟庆,黄凯,王钢,等.不对称三相电压下电压源型换流器谐波分析与抑制策略[J].电力系统自动化,2014,38(4):79-85.Zhong Qing,Huang Kai,Wang Gang,et a1.Harmonic analysis and elimination strategy for voltage source converter under unbalanced three-phase voltage[J].Automation of Electric Power Systems,2014,38(4):79-85(in Chinese).
[7]Wang Z,Xie C,Zhang J,et a1.Dynamic DC-bus voltage control strategies for a three-phase high power shunt active power filter[C]//Applied Power Electronics Conference and Exposition(APEC),2010 Twenty-Fifth Annual IEEE.Palm Springs,CA:IEEE,2010:1514-1520.
[8]Karuppanan P,Kamala K M.PI and fuzzy logic controllers for shunt active power filter—A report[J].ISA Transactions,2012,51(1):163-169.
[9]朱宁辉,白晓民,董伟杰,等.空间矢量脉宽调制下有源电力滤波器直流侧电压设定值研究[J].电网技术,2013,37(2):568-574.Zhu Ninghui,Bai Xiaomin,Dong Weijie,et al.Research on setting value of DC-side voltage for active power filter under space vector pulse width modulation control[J].Power System Technology,2013,37(2):568-574(in Chinese).
[10]李红雨,吴隆辉,卓放,等.一种适用于独立小电网有源电力滤波器研究[J].电力电子技术,2005,39(2):15-17,55.Li Hongyu,Wu Longhui,Zhuo Fang,et a1.Study of active power filter for independent small rating power system[J].Power Elactronics,2005,39(2):15-17,55(in Chinese).
[11]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et a1.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):113-120(in Chinese).
[12]Demirkutlu E,Hava A M.A scalar resonant-filter-bank-based output-voltage control method and a scalar minimum-switching-loss discontinuous PWM method for the four-leg-inverter-based threephase four-wire power supply[J].IEEE Transactions on Industry Applications,2009,45(3):982-991.
[13]徐榕,于泳,杨荣峰,等.基于单相级联延时信号消除法的三相基波正序有功电流检测方法[J].电网技术,2014,38(8):2231-2236.Xu Rong,Yu Yong,Yang Rongfeng,et a1.A method to detect three-phase fundamental positive-sequence active current based on single-phase cascaded delayed signal cancellation[J].Power System Technology,2014,38(8):2231-2236(in Chinese).
[14]姜子健,杨欢,沈建辉,等.基于级联延时信号消除-锁相环算法的配电网静止同步补偿器控制策略[J].电网技术,2015,39(7):1989-1994.Jiang Zijian,Yang Huan,Shen Jianhui,et a1.DSTATCOM control strategy based on cascaded delayed signal cancellation-phase locked loop algorithm[J].Power System Technology,2015,39(7):1989-1994(in Chinese).
[15]De-Souza H E,Neves F A,Cavalcanti M C,et a1.Frequency adaptive phase-sequence separation method based on a generalized delayed signal cancelation method[C]//European Conference on Cognitive Ergonomics.San Jose,CA:IEEE,2009:568-572.
[16]吴恒,杨东升,阮新波.基于串联信号延迟对消法的三相非理想电网锁相控制策略[J].电工技术学报,2014,29(8):255-264.Wu Heng,Yang Dongsheng,Ruan Xinbo.Phase-locked loop based on cascaded delayed signal cancellation for distorted grid[J].Transactions of China Electrotechnical Society,2014,29(8):255-264(in Chinese).
[17]Wang Y F,Li Y W.Analysis and digital implementation of cascaded delayed-signal-cancellation PLL[J].IEEE Transactions on Power Electronics,2011,26(4):1067-1080.
[18]Alfonsogil J C,Vaguecardona J J,Ortsgrau S,et al.Enhanced grid fundamental positive-sequence digital synchronization structure[J].IEEE Transactions on Power Delivery,2013,28(1):226-234.
[19]Mannen T,Fujita H.Dynamic control and analysis of DC-capacitor voltage fluctuations in three-phase active power filters[J].IEEE Transactions on Power Electronics,2016,31(9):6710-6718.
[20]Wu W,Sun Y,Lin Z,et al.A modified LLCL filter with the reduced conducted EMI noise[J].IEEE Transactions on Power Electronics,2014,29(7):3393-3402.
[2]王广柱.并联型有源电力滤波器电流控制的等效原理[J].中国电机工程学报,2006,26(15):40-45.Wang Guangzhu.Equivalence principle of current control for shunt active power filters[J].Proceedings of the CSEE,2006,26(15):40-45(in Chinese).
[3]李志勇,沈玲菲,徐保友,等.基于无谐波检测的LCL-APF直接功率控制[J].电网技术,2012,36(12):217-221.Li Zhiyong,Shen Lingfei,Xu Baoyou,et a1.An LCL-APF direct power control approach based on non-harmonic detection technology[J].Power System Technology,2012,36(12):217-221(in Chinese).
[4]Ribeiro R L,Rocha T O,De-Sousa R M,et al.A robust DC-link voltage control strategy to enhance the performance of shunt active power filters without harmonic detection schemes[J].IEEE Transactions on Industrial Electronics,2015,62(2):803-813.
[5]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012:301-304,20-37,88-99.
[6]钟庆,黄凯,王钢,等.不对称三相电压下电压源型换流器谐波分析与抑制策略[J].电力系统自动化,2014,38(4):79-85.Zhong Qing,Huang Kai,Wang Gang,et a1.Harmonic analysis and elimination strategy for voltage source converter under unbalanced three-phase voltage[J].Automation of Electric Power Systems,2014,38(4):79-85(in Chinese).
[7]Wang Z,Xie C,Zhang J,et a1.Dynamic DC-bus voltage control strategies for a three-phase high power shunt active power filter[C]//Applied Power Electronics Conference and Exposition(APEC),2010 Twenty-Fifth Annual IEEE.Palm Springs,CA:IEEE,2010:1514-1520.
[8]Karuppanan P,Kamala K M.PI and fuzzy logic controllers for shunt active power filter—A report[J].ISA Transactions,2012,51(1):163-169.
[9]朱宁辉,白晓民,董伟杰,等.空间矢量脉宽调制下有源电力滤波器直流侧电压设定值研究[J].电网技术,2013,37(2):568-574.Zhu Ninghui,Bai Xiaomin,Dong Weijie,et al.Research on setting value of DC-side voltage for active power filter under space vector pulse width modulation control[J].Power System Technology,2013,37(2):568-574(in Chinese).
[10]李红雨,吴隆辉,卓放,等.一种适用于独立小电网有源电力滤波器研究[J].电力电子技术,2005,39(2):15-17,55.Li Hongyu,Wu Longhui,Zhuo Fang,et a1.Study of active power filter for independent small rating power system[J].Power Elactronics,2005,39(2):15-17,55(in Chinese).
[11]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et a1.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):113-120(in Chinese).
[12]Demirkutlu E,Hava A M.A scalar resonant-filter-bank-based output-voltage control method and a scalar minimum-switching-loss discontinuous PWM method for the four-leg-inverter-based threephase four-wire power supply[J].IEEE Transactions on Industry Applications,2009,45(3):982-991.
[13]徐榕,于泳,杨荣峰,等.基于单相级联延时信号消除法的三相基波正序有功电流检测方法[J].电网技术,2014,38(8):2231-2236.Xu Rong,Yu Yong,Yang Rongfeng,et a1.A method to detect three-phase fundamental positive-sequence active current based on single-phase cascaded delayed signal cancellation[J].Power System Technology,2014,38(8):2231-2236(in Chinese).
[14]姜子健,杨欢,沈建辉,等.基于级联延时信号消除-锁相环算法的配电网静止同步补偿器控制策略[J].电网技术,2015,39(7):1989-1994.Jiang Zijian,Yang Huan,Shen Jianhui,et a1.DSTATCOM control strategy based on cascaded delayed signal cancellation-phase locked loop algorithm[J].Power System Technology,2015,39(7):1989-1994(in Chinese).
[15]De-Souza H E,Neves F A,Cavalcanti M C,et a1.Frequency adaptive phase-sequence separation method based on a generalized delayed signal cancelation method[C]//European Conference on Cognitive Ergonomics.San Jose,CA:IEEE,2009:568-572.
[16]吴恒,杨东升,阮新波.基于串联信号延迟对消法的三相非理想电网锁相控制策略[J].电工技术学报,2014,29(8):255-264.Wu Heng,Yang Dongsheng,Ruan Xinbo.Phase-locked loop based on cascaded delayed signal cancellation for distorted grid[J].Transactions of China Electrotechnical Society,2014,29(8):255-264(in Chinese).
[17]Wang Y F,Li Y W.Analysis and digital implementation of cascaded delayed-signal-cancellation PLL[J].IEEE Transactions on Power Electronics,2011,26(4):1067-1080.
[18]Alfonsogil J C,Vaguecardona J J,Ortsgrau S,et al.Enhanced grid fundamental positive-sequence digital synchronization structure[J].IEEE Transactions on Power Delivery,2013,28(1):226-234.
[19]Mannen T,Fujita H.Dynamic control and analysis of DC-capacitor voltage fluctuations in three-phase active power filters[J].IEEE Transactions on Power Electronics,2016,31(9):6710-6718.
[20]Wu W,Sun Y,Lin Z,et al.A modified LLCL filter with the reduced conducted EMI noise[J].IEEE Transactions on Power Electronics,2014,29(7):3393-3402.
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