基于微分几何理论的直流微电网控制策略研究
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摘要
目前微电网逆变器控制采用最多的是非线性下垂控制,下垂控制使微电网具有调频功能,但是这种调频是一次调频,不能做到无差调频,在微电网运行中也有不足,不利于电力系统稳定运行。针对非线性控制的缺点,以直流微电网的简化等效模型为研究对象,将传统的微电网非线性控制系统转化为线性控制系统,利用微分几何原理建立等效模型的仿射非线性系统,采取基于鲁棒控制的μ综合方法,建立合理的控制器K,得到系统的非线性鲁棒控制器,Simulink仿真结果表明,当系统的外界参数发生改变时,系统动态稳定性能良好。
The nonlinear droop control is mostly used in microgrid inverter,which makes the microgrid have the function of frequency modulation. However, this kind of frequency modulation as primary frequency modulation can ′ t modulate the frequency without difference,has the disadvantages in the operation of microgrid system,and is harmful to the stable operation of electric power system. Aiming at the shortcomings of nonlinear control,a simplified equivalent model of DC microgrid is taken as the research object,the traditional microgrid nonlinear control system is transformed into a linear control system,and the differential geometry principle is used to establish the affine nonlinear system of the equivalent model. The μ-synthesis method based on robust control is adopted to establish the rational controller K,and obtain the nonlinear robust controller of the system.The Simulink simulation results show that the dynamic stability of the system is perfect when the external parameters of the system are changed.
The nonlinear droop control is mostly used in microgrid inverter,which makes the microgrid have the function of frequency modulation. However, this kind of frequency modulation as primary frequency modulation can ′ t modulate the frequency without difference,has the disadvantages in the operation of microgrid system,and is harmful to the stable operation of electric power system. Aiming at the shortcomings of nonlinear control,a simplified equivalent model of DC microgrid is taken as the research object,the traditional microgrid nonlinear control system is transformed into a linear control system,and the differential geometry principle is used to establish the affine nonlinear system of the equivalent model. The μ-synthesis method based on robust control is adopted to establish the rational controller K,and obtain the nonlinear robust controller of the system.The Simulink simulation results show that the dynamic stability of the system is perfect when the external parameters of the system are changed.
引文
[1]王成山,李微,王议锋,等.直流微电网母线电压波动分类及抑制方法综述[J].中国电机工程学报,2017,37(1):84-96.WANG Chengshan,LI Wei,WANG Yifeng,et al. Overview of classification and suppression methods for DC voltage grid bus voltage fluctuations[J]. Proceedings of the CSEE,2017,37(1):84-96.
[2]李霞林,郭立,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-15.LI Xialin,GUO Li,WANG Chengshan,et al. Summary of key technologies for DC microgrid[J]. Proceedings of the CSEE,2016,36(1):2-15.
[3]李玉梅,査晓明,刘飞,等.带恒功率负荷的直流微电网母线电压稳定控制策略[J].电力自动化设备,2014,34(8):57-64.LI Yumei,ZHA Xiaoming,LIU Fei,et al. Voltage stability control strategy of DC microgrid with constant power load[J].Electric power automation equipment,2014,34(8):57-64.
[4]杨新法,苏剑,吕志鹏,等.微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.YANG Xinfa,SU Jian,LüZhipeng,et al. Overview of microgrid technology[J]. Proceedings of the CSEE, 2014, 34(1):57-70.
[5]马艺玮,杨苹,吴捷.含多分布式电源独立微电网的混合控制策略[J].电力系统自动化,2015,39(11):103-109.MA Yiwei,YANG Ping,WU Jie. Hybrid control strategy for multi-distributed power independent microgrid[J]. Automation of electric power systems,2015,39(11):103-109.
[6]谢林,谢开贵,何坚,等.计及控制策略的并网型微电网可靠性评估[J].电力系统保护与控制,2013,41(15):102-109.XIE Lin,XIE Kaigui,HE Jian,et al. Reliability assessment of grid-connected microgrid with control strategy[J]. Power system protection and control,2013,41(15):102-109.
[7]赵兴勇,杨涛,王灵梅.基于复合储能的微电网运行方式切换控制策略[J].高电压技术,2015(7):2142-2147.ZHAO Xingyong,YANG Tao,WANG Lingmei. Switching control strategy of microgrid operation mode based on composite energy storage[J]. High voltage engineering,2015(7):2142-2147.
[8]何婷,杨苹,许志荣,等.离网情况下微电网频率控制策略[J].现代电力,2017(6):28-32.HE Ting,YANG Ping,XU Zhirong,et al. Microgrid frequency control strategy under off-grid conditions[J]. Modern electric power,2017(6):28-32.
[9]曾君,王侨侨,刘俊峰,等.一种基于势博弈的微电网分布式运行优化算法[J].中国电机工程学报,2017,37(24):7195-7204.ZENG Jun,WANG Qiaoqiao,LIU Junfeng,et al. A distributed game optimization algorithm for microgrid based on potential game[J]. Proceedings of the CSEE,2017,37(24):7195-7204.
[10]蔡高原,吴红斌,季宇,等.基于多代理系统的自治微电网有功协调控制[J].太阳能学报,2017(3):781-788.CAI Gaoyuan,WU Hongbin,JI Yu,et al. Active coordination control of autonomous microgrid based on multi-agent system[J]. Journal of solar energy,2017(3):781-788.
[11]贾磊磊.微网中可维持母线电压恒定的下垂控制[J].中国新技术新产品,2017,20(24):42-44.JIA Leilei. Droop control that maintains constant bus voltage in microgrid[J]. China new technology and new products,2017,20(24):42-44.
[2]李霞林,郭立,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-15.LI Xialin,GUO Li,WANG Chengshan,et al. Summary of key technologies for DC microgrid[J]. Proceedings of the CSEE,2016,36(1):2-15.
[3]李玉梅,査晓明,刘飞,等.带恒功率负荷的直流微电网母线电压稳定控制策略[J].电力自动化设备,2014,34(8):57-64.LI Yumei,ZHA Xiaoming,LIU Fei,et al. Voltage stability control strategy of DC microgrid with constant power load[J].Electric power automation equipment,2014,34(8):57-64.
[4]杨新法,苏剑,吕志鹏,等.微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.YANG Xinfa,SU Jian,LüZhipeng,et al. Overview of microgrid technology[J]. Proceedings of the CSEE, 2014, 34(1):57-70.
[5]马艺玮,杨苹,吴捷.含多分布式电源独立微电网的混合控制策略[J].电力系统自动化,2015,39(11):103-109.MA Yiwei,YANG Ping,WU Jie. Hybrid control strategy for multi-distributed power independent microgrid[J]. Automation of electric power systems,2015,39(11):103-109.
[6]谢林,谢开贵,何坚,等.计及控制策略的并网型微电网可靠性评估[J].电力系统保护与控制,2013,41(15):102-109.XIE Lin,XIE Kaigui,HE Jian,et al. Reliability assessment of grid-connected microgrid with control strategy[J]. Power system protection and control,2013,41(15):102-109.
[7]赵兴勇,杨涛,王灵梅.基于复合储能的微电网运行方式切换控制策略[J].高电压技术,2015(7):2142-2147.ZHAO Xingyong,YANG Tao,WANG Lingmei. Switching control strategy of microgrid operation mode based on composite energy storage[J]. High voltage engineering,2015(7):2142-2147.
[8]何婷,杨苹,许志荣,等.离网情况下微电网频率控制策略[J].现代电力,2017(6):28-32.HE Ting,YANG Ping,XU Zhirong,et al. Microgrid frequency control strategy under off-grid conditions[J]. Modern electric power,2017(6):28-32.
[9]曾君,王侨侨,刘俊峰,等.一种基于势博弈的微电网分布式运行优化算法[J].中国电机工程学报,2017,37(24):7195-7204.ZENG Jun,WANG Qiaoqiao,LIU Junfeng,et al. A distributed game optimization algorithm for microgrid based on potential game[J]. Proceedings of the CSEE,2017,37(24):7195-7204.
[10]蔡高原,吴红斌,季宇,等.基于多代理系统的自治微电网有功协调控制[J].太阳能学报,2017(3):781-788.CAI Gaoyuan,WU Hongbin,JI Yu,et al. Active coordination control of autonomous microgrid based on multi-agent system[J]. Journal of solar energy,2017(3):781-788.
[11]贾磊磊.微网中可维持母线电压恒定的下垂控制[J].中国新技术新产品,2017,20(24):42-44.JIA Leilei. Droop control that maintains constant bus voltage in microgrid[J]. China new technology and new products,2017,20(24):42-44.