多端柔性直流配电系统主从控制模式下的稳定性与优化控制
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摘要
多端柔性直流配电系统是配电系统的一个重要发展趋势,其可有效提升城市配电系统的电能质量、可靠性与运行效率。主要研究了主从控制模式下多端柔性直流配电系统运行时的稳定性问题。建立了基于动态导纳的小扰动稳定分析模型,研究了直流负荷、直流线路参数和多端互联等影响因素变化时系统出现的不稳定现象,提出了基于带通滤波的前馈补偿定直流电压控制方法,并对补偿前、后的系统稳定性进行了分析比较,通过改进的IEEE 33节点配电系统进行时域仿真测试,仿真结果表明了所提方法能够有效地提高系统阻尼与稳定性。
Multi-terminal flexible DC distribution system is an important development trend of distribution system,which can effectively improve the power quality,reliability and operational efficiency of urban distribution system.The research mainly focuses on the stability problems of multi-terminal flexible DC distribution system under masterslave control mode. A small signal stability analysis model based on the dynamic admittance is established. The instability phenomenons,which are caused by the changes of influencing factors such as DC load,DC line parameters,terminal number and so on,are analyzed. Then a feedforward compensation constant DC bus voltage control method based on band-pass filter is put forward,and system stability before and after compensation is compared. A time-domain simulation test is carried out in the modified IEEE 33-bus distribution system,and the simulative results show that the proposed method can improve the damping and stability of the system effectively.
Multi-terminal flexible DC distribution system is an important development trend of distribution system,which can effectively improve the power quality,reliability and operational efficiency of urban distribution system.The research mainly focuses on the stability problems of multi-terminal flexible DC distribution system under masterslave control mode. A small signal stability analysis model based on the dynamic admittance is established. The instability phenomenons,which are caused by the changes of influencing factors such as DC load,DC line parameters,terminal number and so on,are analyzed. Then a feedforward compensation constant DC bus voltage control method based on band-pass filter is put forward,and system stability before and after compensation is compared. A time-domain simulation test is carried out in the modified IEEE 33-bus distribution system,and the simulative results show that the proposed method can improve the damping and stability of the system effectively.
引文
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[9]张学,裴玮,邓卫,等.含恒功率负载的交直流混联配电系统稳定性分析[J].中国电机工程学报,2017,37(19):5572-5582,5834.ZHANG Xue,PEI Wei,DENG Wei,et al. Stability analysis of AC/DC hybrid distribution system with constant power loads[J]. Proceedings of the CSEE,2017,37(19):5572-5582,5834.
[10]朱晓荣,谢志云,荆树志.直流微电网虚拟惯性控制及其稳定性分析[J].电网技术,2017,41(12):3884-3893.ZHU Xiaorong,XIE Zhiyun,JING Shuzhi. Virtual inertia control and stability analysis of DC micro-grid[J]. Power System Technology,2017,41(12):3884-3893.
[11]郭力,冯怿彬,李霞林,等.直流微电网稳定性分析及阻尼控制方法研究[J].中国电机工程学报,2016,36(4):927-936.GUO Li,FENG Yibin,LI Xialin,et al. Stability analysis and research of active damping method for DC microgrids[J]. Proceedings of the CSEE,2016,36(4):927-936.
[12]彭克,咸日常,张新慧,等.多端互联交直流配电网的潮流分层控制策略及算法[J].电力系统自动化,2016,40(14):72-77.PENG Ke,XIAN Richang,ZHANG Xinhui,et al. Hierarchical power flow control strategy and algorithm for multi-terminal interconnected AC/DC distribution network[J]. Automation of Electric Power Systems,2016,40(14):72-77.
[13]彭克,张新慧,陈羽.适用于多端柔性互联的交直流配电网潮流计算方法[J].电力自动化设备,2017,37(1):22-27.PENG Ke,ZHANG Xinhui,CHEN Yu. Power flow calculation algorithm for AC-DC hybrid distribution network with multi-terminal flexible interconnection[J]. Electric Power Automation Equipment,2017,37(1):22-27.
[2]杜翼,江道灼,尹瑞,等.直流配电网拓扑结构及控制策略[J].电力自动化设备,2015,35(1):139-145.DU Yi,JIANG Daozhuo,YIN Rui,et al. Topological structure and control strategy of DC distribution nework[J]. Electric Power Automation Equipment,2015,35(1):139-145.
[3]和敬涵,周琳,罗国敏,等.基于单端电气量的多端柔性直流配电系统暂态保护[J].电力自动化设备,2017,37(8):158-165.HE Jinghan,ZHOU Lin,LUO Guomin,et al. Transient protection based on single-end electrical signals for multi-terminal flexible DC distribution system[J]. Electric Power Automation Equipment,2017,37(8):158-165.
[4]孙谦浩,王裕,宋强,等.应用于直流配电网的双向全桥直流变换器比较分析[J].电力自动化设备,2017,37(10):49-56.SUN Qianhao,WANG Yu,SONG Qiang,et al. Analysis and comparison of dual-active-bridge DC/DC converters in DC distribution network[J]. Electric Power Automation Equipment,2017,37(10):49-56.
[5]李斌,邱宏,洪潮,等.基于电压源型换流器的柔性直流系统快速方向保护[J].电力自动化设备,2018,38(2):1-8.LI Bin,QIU Hong,HONG Chao,et al. High-speed direction protection of flexible DC system based on voltage source converter[J].Electric Power Automation Equipment,2018,38(2):1-8.
[6]高仁栋,吴在军,范文超,等.基于电流微分初始值的VSC直流配电系统线路故障定位方法[J].电力自动化设备,2018,38(2):27-33.GAO Rendong,WU Zaijun,FAN Wenchao,et al. Line fault location method of VSC-based DC distribution system based on initial current differential value[J]. Electric Power Automation Equipment,2018,38(2):27-33.
[7]RADWAN A A,MOHAMED Y A R I. Assessment and mitigation of interaction dynamics in hybrid AC/DC distribution generation systems[J]. IEEE Transactions on Smart Grid,2012,3(3):1382-1393.
[8]李霞林,郭力,王成山.微网主从控制模式下的稳定性分析[J].电工技术学报,2014,29(2):24-34.LI Xialin,GUO Li,WANG Chengshan. Stability analysis in a masterslave control based microgrid[J]. Transactions of China Electrotechnical Society,2014,29(2):24-34.
[9]张学,裴玮,邓卫,等.含恒功率负载的交直流混联配电系统稳定性分析[J].中国电机工程学报,2017,37(19):5572-5582,5834.ZHANG Xue,PEI Wei,DENG Wei,et al. Stability analysis of AC/DC hybrid distribution system with constant power loads[J]. Proceedings of the CSEE,2017,37(19):5572-5582,5834.
[10]朱晓荣,谢志云,荆树志.直流微电网虚拟惯性控制及其稳定性分析[J].电网技术,2017,41(12):3884-3893.ZHU Xiaorong,XIE Zhiyun,JING Shuzhi. Virtual inertia control and stability analysis of DC micro-grid[J]. Power System Technology,2017,41(12):3884-3893.
[11]郭力,冯怿彬,李霞林,等.直流微电网稳定性分析及阻尼控制方法研究[J].中国电机工程学报,2016,36(4):927-936.GUO Li,FENG Yibin,LI Xialin,et al. Stability analysis and research of active damping method for DC microgrids[J]. Proceedings of the CSEE,2016,36(4):927-936.
[12]彭克,咸日常,张新慧,等.多端互联交直流配电网的潮流分层控制策略及算法[J].电力系统自动化,2016,40(14):72-77.PENG Ke,XIAN Richang,ZHANG Xinhui,et al. Hierarchical power flow control strategy and algorithm for multi-terminal interconnected AC/DC distribution network[J]. Automation of Electric Power Systems,2016,40(14):72-77.
[13]彭克,张新慧,陈羽.适用于多端柔性互联的交直流配电网潮流计算方法[J].电力自动化设备,2017,37(1):22-27.PENG Ke,ZHANG Xinhui,CHEN Yu. Power flow calculation algorithm for AC-DC hybrid distribution network with multi-terminal flexible interconnection[J]. Electric Power Automation Equipment,2017,37(1):22-27.