基于灵活虚拟惯性控制的直流微网小信号建模及参数分析
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摘要
直流微电网是小惯性系统,负荷突变和新能源出力波动等因素都会影响直流母线电压的稳定,针对此问题,首先类比交流系统中的虚拟同步发电机(VSG)技术,根据交、直流系统间各变量的对应关系,提出一种应用于直流微电网的灵活虚拟惯性(FVI)控制策略,为受到扰动时的直流微网提供灵活可调的惯性支持,以提高系统的电压稳定性;其次,构建基于FVI控制的六端直流微网小信号模型,并通过灵敏度计算及根轨迹分析揭示了主要控制参数变化对系统虚拟惯性及直流电压稳定性的影响规律,为参数的选择提供了依据;最后,通过实时仿真证明所提控制方法的优越性及理论分析的正确性。
DC microgrid is a system with small inertia. The disturbance of load and the fluctuation of renewable energy will affect the stability of DC bus voltage. Aiming at the problem, a flexible virtual inertia(FVI) control strategy of DC microgrid is proposed firstly by analogy with the virtual synchronous generator(VSG) technology according to the correspondence relationship between the variables of AC and DC system in order to supply the adjustable inertia support for the DC microgrid and improve the voltage stability of the system. Then, the small-signal model of the six-terminal microgrid based on FVI control is constructed, and the influence law of the main control parameters on the virtual inertia and DC voltage stability of the system is revealed by the sensitivity calculation and root locus analysis, which provides the basis for the selection of the control parameters.Finally, the superiority of the proposed control method and the correctness of the theoretical analysis are verified by the real-time simulation.
DC microgrid is a system with small inertia. The disturbance of load and the fluctuation of renewable energy will affect the stability of DC bus voltage. Aiming at the problem, a flexible virtual inertia(FVI) control strategy of DC microgrid is proposed firstly by analogy with the virtual synchronous generator(VSG) technology according to the correspondence relationship between the variables of AC and DC system in order to supply the adjustable inertia support for the DC microgrid and improve the voltage stability of the system. Then, the small-signal model of the six-terminal microgrid based on FVI control is constructed, and the influence law of the main control parameters on the virtual inertia and DC voltage stability of the system is revealed by the sensitivity calculation and root locus analysis, which provides the basis for the selection of the control parameters.Finally, the superiority of the proposed control method and the correctness of the theoretical analysis are verified by the real-time simulation.
引文
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[13]Alipoor J,Miura Y,Ise T.Power system stabilization using virtual synchronous generator with alternating moment of inertia[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(2):451-458.
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[15]Fan Wei,Yan Xiangwu,Hua Tianqi.Adaptive parameter control strategy of VSG for improving system transient stability[C]//IEEE 3rd International Future Energy Electronics Conference and ECCEAsia,Taiwan,2017:2053-2058.
[16]孟建辉.分布式电源的虚拟同步发电机控制技术研究[D].保定:华北电力大学,2015.
[17]宋琼,张辉,孙凯,等.多微源独立微网中虚拟同步发电机的改进型转动惯量自适应控制[J].中国电机工程学报,2017,37(2):412-424.Song Qiong,Zhang Hui,Sun Kai,et al.Improved adaptive control of inertia for virtual synchronous generators in islanding micro-grid with multiple distributed generation units[J].Proceedings of the CSEE,2017,37(2):412-424.
[18]伍文华,陈燕东,罗安,等.一种直流微网双向并网变换器虚拟惯性控制策略[J].中国电机工程学报,2017,37(2):360-372.Wu Wenhua,Chen Yandong,Luo An,et al.A virtual inertia control Strategy for bidirectional gridconnected converters in DC micro-grids[J].Proceedings of the CSEE,2017,37(2):360-372
[2]贺悝,李勇,曹一家,等.考虑分布式储能参与的直流配电网电压柔性控制策略[J].电工技术学报,2017,32(10):101-110.He Li,Li Yong,Cao Yijia,et al.Flexible voltage control strategy of DC distribution network considering distributed energy storage[J].Transactions of China Electrotechnical Society,2017,32(10):101-110.
[3]陈美福,赵新,金新民,等.直流微网中复合储能装置的并联技术研究[J].电工技术学报,2016,31(增刊2):142-149.Chen Meifu,Zhao Xin,Jin Xinmin,et al.Research on parallel control strategy of hybrid energy storage units in DC microgrid[J].Transactions of China Electrotechnical Society,2016,31(S2):142-149.
[4]王毅,于明,李永刚.基于改进微分进化算法的风电直流微网能量管理[J].电网技术,2015,39(9):2392-2397.Wang Yi,Yu Ming,Li Yonggang.Energy management of wind turbine-based DC microgrid using improved differential algorithm[J].Power System Technology,2015,39(9):2392-2397.
[5]王琛,孟建辉,王毅,等.考虑蓄电池荷电状态的孤岛直流微网多源协调控制策略[J].高电压技术,2018,44(1):160-168.Wang Chen,Meng Jianhui,Wang Yi,et al.Multisource coordinated control strategy considering battery’s SOC for islanded DC microgrid[J].High Voltage Engineering,2018,44(1):160-168.
[6]张曦,张宁,龙飞,等.分布式电源接入配网对其静态电压稳定性影响多角度研究[J].电力系统保护与控制,2017,45(6):120-125.Zhang Xi,Zhang Ning,Long Fei,et al.Research of the impacts on static voltage stability of distribution networks with distributed generation from different aspects[J].Power System Protection and Control,2017,45(6):120-125.
[7]Dragicevic T,Guerrero J M,Vasquez J C,et al.Supervisory control of an adaptive-droop regulated DC microgrid with battery management capability[J].IEEE Transactions on Power Electronics,2014,29(2):695-706.
[8]Wu T F,Chang C H,Lin L C,et al.DC-bus voltage control with a three-phase bidirectional inverter for DC distribution systems[J].IEEE Transactions on Power Electronics,2013,28(4):1890-1899.
[9]Zhao Hailin,Yang Qiang,Zeng Hongmei.Multi-loop virtual synchronous generator control of inverterbased DGs under microgrid dynamics[J].IET Generation,Transmission&Distribution,2017,11(3):795-803.
[10]孟建辉,石新春,王毅,等.改善微电网频率稳定性的分布式逆变电源控制策略[J].电工技术学报,2015,30(4):70-79.Meng Jianhui,Shi Xinchun,Wang Yi,et al.Control strategy of DER inverter for improving frequency stability of microgrid[J].Transactions of China Electrotechnical Society,2015,30(4):70-79.
[11]石荣亮,张兴,刘芳,等.虚拟同步发电机及其在多能互补微电网中的运行控制策略[J].电工技术学报,2016,31(20):170-180.Shi Rongliang,Zhang Xing,Liu Fang,et al.Control technologies of multi-energy complementary microgrid operation based on virtual synchronous generator[J].Transactions of China Electrotechnical Society,2016,31(20):170-180.
[12]吕志鹏,盛万兴,刘海涛,等.虚拟同步机技术在电力系统中的应用与挑战[J].中国电机工程学报,2017,37(2):349-360.LüZhipeng,Sheng Wanxing,Liu Haitao,et al.Application and challenge of virtual synchronous machine technology in power system[J].Proceedings of the CSEE,2017,37(2):349-360.
[13]Alipoor J,Miura Y,Ise T.Power system stabilization using virtual synchronous generator with alternating moment of inertia[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(2):451-458.
[14]陈来军,王任,郑天文,等.基于参数自适应调节的虚拟同步发电机暂态响应优化控制[J].中国电机工程学报,2016,36(21):5724-5731.Chen Laijun,Wang Ren,Zheng Tianwen,et al.Optimal control of transient response of virtual synchronous generator based on adaptive parameter adjustment[J].Proceedings of the CSEE,2016,36(21):5724-5731.
[15]Fan Wei,Yan Xiangwu,Hua Tianqi.Adaptive parameter control strategy of VSG for improving system transient stability[C]//IEEE 3rd International Future Energy Electronics Conference and ECCEAsia,Taiwan,2017:2053-2058.
[16]孟建辉.分布式电源的虚拟同步发电机控制技术研究[D].保定:华北电力大学,2015.
[17]宋琼,张辉,孙凯,等.多微源独立微网中虚拟同步发电机的改进型转动惯量自适应控制[J].中国电机工程学报,2017,37(2):412-424.Song Qiong,Zhang Hui,Sun Kai,et al.Improved adaptive control of inertia for virtual synchronous generators in islanding micro-grid with multiple distributed generation units[J].Proceedings of the CSEE,2017,37(2):412-424.
[18]伍文华,陈燕东,罗安,等.一种直流微网双向并网变换器虚拟惯性控制策略[J].中国电机工程学报,2017,37(2):360-372.Wu Wenhua,Chen Yandong,Luo An,et al.A virtual inertia control Strategy for bidirectional gridconnected converters in DC micro-grids[J].Proceedings of the CSEE,2017,37(2):360-372
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