抗IPS频率波动的两种改进重复控制方法
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摘要
独立电力系统惯性系数小、源载耦合度高,系统频率极易产生较大的波动,因此,接入系统的并联有源滤波器SAPF的电流控制器必须基于电网频率波动而设计。对传统重复控制方法进行改进,提出了2种快速重复控制方法(fast repetitive control,FRC),通过缩小重复环节延迟时间来提高响应的快速性,其中,自抗频扰FRC从结构的改进获得较宽的谐振频宽,基于内模Q的FRC通过内模系数Q的引入使重复谐振项呈现为准谐振特性。基于幅频特性比较分析了两者的控制性能,讨论其适用范围,并结合零极点分析,进一步讨论2种控制器参数与SAPF系统稳定性之间的关系。仿真与试验结果表明,与传统重复控制方法相比,文中提出的2种快速重复控制方法均体现出动态响应速度高、静态误差小和抗电网频率波动的特点。
Isolated power system has small inertia and close source-load coupling, and the system frequency is prone to bigger fluctuation, so current controller in shunt active power filter(SAPF) access system must be designed based on concern of frequency fluctuation in the grid. The traditional repetitive control method is improved, and a self-frequency-disturbance-rejection and a internal-model-parameter Q based fast repetitive control(FRC) methods are proposed in this paper. Based on amplitude-frequency characteristic analysis, control performance and application range of the two methods are compared. Furthermore, with pole-zero analysis, the relation between controller parameters and SAPF stability is discussed. Simulation and experiment results imply that, compared with traditional repetitive method, the two proposed methods both have higher speed of dynamic response, smaller steady-state error and better ability against grid frequency fluctuation.
Isolated power system has small inertia and close source-load coupling, and the system frequency is prone to bigger fluctuation, so current controller in shunt active power filter(SAPF) access system must be designed based on concern of frequency fluctuation in the grid. The traditional repetitive control method is improved, and a self-frequency-disturbance-rejection and a internal-model-parameter Q based fast repetitive control(FRC) methods are proposed in this paper. Based on amplitude-frequency characteristic analysis, control performance and application range of the two methods are compared. Furthermore, with pole-zero analysis, the relation between controller parameters and SAPF stability is discussed. Simulation and experiment results imply that, compared with traditional repetitive method, the two proposed methods both have higher speed of dynamic response, smaller steady-state error and better ability against grid frequency fluctuation.
引文
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[20]GB/T 15945—2008.电能质量电力系统频率偏差[S].北京:2008.
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[23]王勇,刘金宁,刘正春,等.有限容量系统感应电动机暂态特性研究[J].华北电力大学学报,2016,43(4):42-46.Wang Yong,Liu Jinning,Liu Zhengchun,et al.Transient characteristics of inductive motor in limited capacity power system[J].Journal of North China Electric Power University,2016,43(4):42-46(in Chinese).
[2]Feng X Y,Purry B,Zourntos T.A multi-agent system framework for real-time electric load management on MVAC all-electric ship power systems[J].IEEE Transactions on Power Systems,2015,30(3):1327-1335.
[3]陈来军,梅生伟,许寅,等.未来电网中的独立电力系统模式[J].电力科学与技术学报,2011,26(4):30-36.Chen Laijun,Mei Shengwei,Xu Yin,et al.A new pattern of future power grids:isolated power system[J].Journal of Electric Power Science and Technology,2011,26(4):30-36(in Chinese).
[4]刘正春,朱长青,赵锦成.独立电力系统非线性负荷暂态特性仿真[J].高电压技术,2017,43(1):329-336.Liu Zhengchun,Zhu Changqing,Zhao Jincheng.Simulations on transient characteristics of non-linear load in isolated power system[J].High Voltage Engineering,2017,43(1):329-336(in Chinese).
[5]刘正春,朱长青,王勇,等.负荷冲击性对独立电力系统暂态特性的影响[J].高电压技术,2017,43(10):3443-3453.Liu Zhengchun,Zhu Changqing,Wang Yong,et al.Influence of impact load on transient characteristics of isolated power system[J].High Voltage Engineering,2017,43(10):3443-3453(in Chinese).
[6]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):113-121.Zhou Juan,Zhang Yong,Geng Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):113-121(in Chinese).
[7]操丰梅,朱喆,张效宇,等.VSC-HVDC中直流换流器的比例积分-准谐振-重复控制策略[J].电网技术,2015,39(4):968-977.Cao Fengmei,Zhu Zhe,Zhang Xiaoyu,et al.Proportional integralquasi-resonant-repetitive control strategy for VSC of VSC-HVDC[J].Power System Technology,2015,39(4):968-977(in Chinese).
[8]杨秋霞,梁雄国,郭小强,等.准谐振控制器在有源电力滤波器中的应用[J].电工技术学报,2009,24(7):171-177.Yang Qiuxia,Liang Xiongguo,Guo Xiaoqiang,et al.Application of quasi resonant controller for active power filter[J].Transactions Of China Electrotechnical Society,2009,24(7):171-177(in Chinese).
[9]高峰,林辉.基于通用内模的变频电网有源电力滤波器自适应重复控制[J].控制理论与应用,2014,31(6):725-735.Gao Feng,Lin Hui.An adaptive repetitive controller based on generic internal model for active power filter in variable-frequency power system[J].Control Theory&Applications,2014,31(6):725-735(in Chinese).
[10]Zou Z,Zhou K,Wang Z,et al.Frequency adaptive fractional order repetitive control of shunt active power filters[J].IEEE Transactions on Industrial Electronics,2015,62(3):1659-1668.
[11]周娟,郑婉玉,刘刚,等.一种具有频率适应性的nk±m次谐波重复控制策略及其在四桥臂APF中的应用[J].电源学报,2017,15(4):10-17.Zhou Juan,Zheng Wanyu,Liu Gang,et al.Frequency adaptive nk±m order harmonic repetitive controller and its application in four-leg APF[J].Journal of Power Supply,2017,15(4):10-17(in Chinese).
[12]宫金武,查晓明,陈佰锋.一种快速重复控制策略在APF中的实现和分析[J].电工技术学报,2011,26(10):110-118.Gong Jinwu,Zha Xiaoming,Chen Baifeng.Analysis and realization of a fast repetitive controller in active power filter system[J].Transactions of China Electro-Technical Society,2011,26(10):110-118(in Chinese).
[13]Herran M A,Fischer J R,Gonzalez S A,et al.Repetitive control with adaptive sampling frequency for wind power generation systems[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(1):58-69.
[14]竺明哲,叶永强,赵强松,等.抗电网频率波动的重复控制参数设计方法[J].中国电机工程学报,2016,36(14):3857-3869.Zhu Mingzhe,Ye Yongqiang,Zhao Qiangsong,et al.A design method of repetitive controller against variation of grid frequency[J].Proceedings of the CSEE,2016,36(14):3857-3869(in Chinese).
[15]卢闻州,周克亮,程明,等.PWM并网变换器多内模并联结构重复控制策略[J].电力系统保护与控制,2016,44(15):39-48.Lu Wenzhou,Zhou Keliang,Cheng Ming,et al.Parallel structure repetitive controller for PWM grid-connected converters[J].Power System Protection and Control,2016,44(15):39-48(in Chinese).
[16]张国月,钟皖生,吴越,等.多内模技术在光伏并网发电系统电流波形质量改善中的应用[J].中国电机工程学报,2014,34(1):22-32.Zhang Guoyue,Zhong Wansheng,Wu Yue,et al.Multi-internal model technique applied in the improving of current wave quality in PV grid-connected power systems[J].Proceedings of the CSEE,2014,34(1):22-32(in Chinese).
[17]姜一鸣,姚俊涛,刘飞,等.考虑电网频率偏差的并网逆变器多内模重复控制[J].电力系统保护与控制,2016,44(21):144-150.Jiang Yiming,Yao Juntao,Liu Fei,et al.A multi-internal-model repetitive control for grid-connected inverter considering grid-frequency deviation[J].Power System Protection and Control,2016,44(21):144-150(in Chinese).
[18]屈艾文,陈道炼.重复控制三相电压型准Z源光伏并网逆变系统[J].电网技术,2017,41(6):1998-2008.Qu Aiwen,Chen Daolian.Three-phase voltage-fed quasi-z-source photovoltaic grid-connected inverter system with repetitive control[J].Power System Technology,2017,41(6):1998-2008(in Chinese).
[19]张兴,汪杨俊,余畅舟,等.采用PI+重复控制的并网逆变器控制耦合机理及其抑制策略[J].中国电机工程学报,2014,34(30):5287-5292.Zhang Xing,Wang Yangjun,Yu Changzhou,et al.Mechanism of the control coupling and suppression strategy using pi and repetitive control in grid-connected inverters[J].Proceedings of the CSEE,2014,34(30):5287-5292(in Chinese).
[20]GB/T 15945—2008.电能质量电力系统频率偏差[S].北京:2008.
[21]刘正春,王勇,尹志勇,等.有限容量系统脉冲性负荷建模与仿真[J].华北电力大学学报,2014,41(1):33-37.Liu Zhengchun,Wang Yong,Yin Zhiyong,et al.Modeling and simulation of pulsed power load in limited capacity system[J].Journal of North China Electric Power University,2014,41(1):33-37(in Chinese).
[22]刘正春,朱长青,王勇,等.脉冲负载下电力系统暂稳态功率特性研究[J].电网技术,2017,41(9):3018-3026.Liu Zhengchun,Zhu Changqing,Wang Yong,et al.Transient and steady-state power characteristics of power system with pulsed load[J].Power System Technology,2017,41(9):3018-3026(in Chinese).
[23]王勇,刘金宁,刘正春,等.有限容量系统感应电动机暂态特性研究[J].华北电力大学学报,2016,43(4):42-46.Wang Yong,Liu Jinning,Liu Zhengchun,et al.Transient characteristics of inductive motor in limited capacity power system[J].Journal of North China Electric Power University,2016,43(4):42-46(in Chinese).