直流微网谐振模态分析及有源阻尼抑制方法
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摘要
谐振可能引起直流微网的谐波不稳定,是导致电压崩溃的潜在原因。利用频域分析法确定直流微网的谐振频率需要建立复杂的高阶传递函数,且不能提供谐振影响范围等信息。提出了分布式控制下直流微网的谐振模态分析方法,通过分析系统的节点导纳矩阵确定系统的谐振频率,并利用频域分析验证该方法的有效性;根据参与因子确定谐振的影响范围,进一步地研究了线路参数对系统模式和谐振频率的影响;提出了有源阻尼抑制方法,通过在电流内环注入阻尼信号降低线路调节变流器(LRC)输出阻抗的谐振峰值,提高系统的稳定性;基于PSCAD/EMTDC平台对所提分析方法和有源阻尼控制进行仿真验证。
Resonance could cause harmonic instability in DC microgrid,and represents a potential cause of voltage collapse. To determine the resonance frequency of DC microgrid,the traditional frequency domain analysis requires the establishment of complicated high-order transfer function and cannot provide the information such as influence range of resonance. A resonance modal analysis method of DC microgrid under distributed control is proposed,and the resonance frequency of the system is obtained by analyzing its node admittance matrix. The effectiveness of the method is verified using the frequency domain analysis. The influence range of the resonance can be determined according to the participation factors. Besides,the influence of line parameters on system mode and resonance frequency is analyzed. Furthermore,an active damping controller is proposed,which reduces the resonance peak value of LRC(Line Regulating Converter) output impedance by injecting damping signal into the inner current loop,and improves the stability of system. Finally,the proposed method and the active damping control are verified by simulative results on PSCAD/EMTDC.
Resonance could cause harmonic instability in DC microgrid,and represents a potential cause of voltage collapse. To determine the resonance frequency of DC microgrid,the traditional frequency domain analysis requires the establishment of complicated high-order transfer function and cannot provide the information such as influence range of resonance. A resonance modal analysis method of DC microgrid under distributed control is proposed,and the resonance frequency of the system is obtained by analyzing its node admittance matrix. The effectiveness of the method is verified using the frequency domain analysis. The influence range of the resonance can be determined according to the participation factors. Besides,the influence of line parameters on system mode and resonance frequency is analyzed. Furthermore,an active damping controller is proposed,which reduces the resonance peak value of LRC(Line Regulating Converter) output impedance by injecting damping signal into the inner current loop,and improves the stability of system. Finally,the proposed method and the active damping control are verified by simulative results on PSCAD/EMTDC.
引文
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[16] 肖华锋,许津铭,谢少军. LCL型进网滤波器的有源阻尼技术分析与比较[J]. 电力自动化设备,2013,33(5):55-59.XIAO Huafeng,XU Jinming,XIE Shaojun. Analysis and comparison of active damping technologies for LCL filter[J]. Electric Power Automation Equipment,2013,35(5):55-59.
[17] 雷一,赵争鸣,鲁思兆. LCL滤波的光伏并网逆变器有源阻尼与无源阻尼混合控制[J]. 电力自动化设备,2012,32(11):23-27.LEI Yi,ZHAO Zhengming,LU Sizhao. Hybrid control of active and passive damping for grid-connected PV invert with LCL filter[J]. Electric Power Automation Equipment,2012,32(11):23-27.
[2] 胡辉勇,王晓明,于淼,等. 主从控制下直流微电网稳定性分析及有源阻尼控制方法[J]. 电网技术,2017,41(8):2664-2673.HU Huiyong,WANG Xiaoming,YU Miao,et al. Stability analysis and active damping control for master-slave controlled DC microgrid[J]. Power System Technology,2017,41(8):2664-2673.
[3] 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.
[4] LIU Y,RAZA A,ROUZBEHI K,et al. Dynamic resonance analysis and oscillation damping of multiterminal DC grids[J]. IEEE Access,2017,5:16974-16984.
[5] RASHIDIRAD N,HAMZEH M,SHESHYEKANI K,et al. High-frequency oscillations and their leading causes in DC microgrids[J]. IEEE Transactions on Energy Conversion,2017,32(4):1479-1491.
[6] RASHIDIRAD N,HAMZEH M,SHESHYEKANI K,et al. A simplified equivalent model for the analysis of low-frequency stability of multi-bus DC microgrids[J]. IEEE Transactions on Smart Grid,2018,9(6):6170-6182.
[7] RASHIDIRAD N,HAMZEH M,SHESHYEKANI K,et al. An effective method for low-frequency oscillations damping in multibus DC microgrids[J]. IEEE Journal on Emerging & Selected Topics in Circuits & Systems,2017,7(3):403-412.
[8] 林刚,李勇,王姿雅,等. 低压直流配电系统谐振机理分析与有源抑制方法[J]. 电网技术,2017,41(10):3358-3364.LIN Gang,LI Yong,WANG Ziya,et al. Resonance mechanism ana-lysis and its active damping suppression of LVDC distribution system[J]. Power System Technology,2017,41(10):3358-3364.
[9] YE Q,MO R,LI H. Low-frequency resonance suppression of a dual-active-bridge DC/DC converter enabled DC microgrid[J]. IEEE Journal of Emerging & Selected Topics in Power Electronics,2017,5(3):982-994.
[10] SU M,LIU Z,SUN Y,et al. Stability analysis and stabilization me-thods of DC Microgrid with multiple parallel-connected DC-DC converters loaded by CPLs[J]. IEEE Transactions on Smart Grid,2018,9(1):132-142.
[11] SULLIGOI G,BOSICH D,GIADROSSI G,et al. Multiconverter medium voltage DC power systems on ships:constant-power loads instability solution using linearization via state feedback control[J]. IEEE Transactions on Smart Grid,2014,5(5):2543-2552.
[12] LU X,SUN K,GUERRERO J M,et al. Stability enhancement based on virtual impedance for DC microgrids with constant power loads[J]. IEEE Transactions on Smart Grid,2017,6(6):2770-2783.
[13] MO R,YE Q,LI H. DC impedance modeling and stability analysis of modular multilevel converter for MVDC application [C]//Energy Conversion Congress and Exposition. Cincinnati,Ohio,USA:IEEE,2017:1-5.
[14] 刘洋,帅智康,李杨,等. 多逆变器并网系统谐波谐振模态分析[J]. 中国电机工程学报,2017,37(14):4156-4164.LIU Yang,SHUAI Zhikang,LI Yang,et al. Harmonic resonance modal analysis of multi-inverter grid-connected systems[J]. Procee-dings of the CSEE,2017,37(14):4156-4164.
[15] 方刚,杨勇,卢进军,等. 三相光伏并网逆变器电网高阻抗谐振抑制方法[J]. 电力自动化设备,2018,38(2):109-116.FANG Gang,YANG Yong,LU Jinjun,et al. Resonance suppression method of high impedance power grid for three-phase photovoltaic grid-connected inverters[J]. Electric Power Automation Equip-ment,2018,38(2):109-116.
[16] 肖华锋,许津铭,谢少军. LCL型进网滤波器的有源阻尼技术分析与比较[J]. 电力自动化设备,2013,33(5):55-59.XIAO Huafeng,XU Jinming,XIE Shaojun. Analysis and comparison of active damping technologies for LCL filter[J]. Electric Power Automation Equipment,2013,35(5):55-59.
[17] 雷一,赵争鸣,鲁思兆. LCL滤波的光伏并网逆变器有源阻尼与无源阻尼混合控制[J]. 电力自动化设备,2012,32(11):23-27.LEI Yi,ZHAO Zhengming,LU Sizhao. Hybrid control of active and passive damping for grid-connected PV invert with LCL filter[J]. Electric Power Automation Equipment,2012,32(11):23-27.