基于虚拟同步发电机控制并网逆变器的研究与设计
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摘要
针对高比例可再生能源接入电网,无法主动提供频率调节和惯量响应的问题,给出一种新能源并网逆变器的虚拟同步发电机控制策略。在建立有功控制环小信号模型的基础上,遵从"最优二阶系统"的方法设计了有功环虚拟惯量和阻尼系数;再按照控制带宽1∶10∶100的关系,分别设计无功、电压、电流环的控制参数。最后搭建了基于MATLAB/Simulink的仿真模型,验证了虚拟同步发电机控制策略的可行性和所设计控制参数的合理性。
On account of issues that high-penetration renewable energy can not provide frequency regulation and inertia response to the grid,this paper presented a virtual synchronous generator( VSG) control strategy. On the basis of building the small-signal model of the active power loop,coefficients of the virtual inertia and damping were designed according to the "optimal second order system"method. Next,based on the bandwith distribution ratio in1∶ 10∶ 100,the control parameters of the reactive power,voltage and current loop were designed respectively. Finally,in the MATLAB/Simulink platform,the feasibility of the VSG control strategy and the reasonablity of the control parameters were verified.
On account of issues that high-penetration renewable energy can not provide frequency regulation and inertia response to the grid,this paper presented a virtual synchronous generator( VSG) control strategy. On the basis of building the small-signal model of the active power loop,coefficients of the virtual inertia and damping were designed according to the "optimal second order system"method. Next,based on the bandwith distribution ratio in1∶ 10∶ 100,the control parameters of the reactive power,voltage and current loop were designed respectively. Finally,in the MATLAB/Simulink platform,the feasibility of the VSG control strategy and the reasonablity of the control parameters were verified.
引文
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[2]李会利,顾礼峰,秦超.基于状态空间法的三相并网逆变器建模与仿真[J].电气自动化,2016,38(1):31-33.
[3]刘巨,姚伟,文劲宇,等.大规模风电参与系统频率调整的技术展望[J].电网技术,2014,38(3):638-646.
[4]MULLANE A,O'MALLEY M.The inertial response of induction-machine-based wind turbines[J].IEEE Transactions on Power Systems,2005,20(3):1496-1503.
[5]KAYIKCI M,MILANOVIC J V.Dynamic contribution of DFIG-based wind plants to system frequency disturbances[J].IEEE Transactions on Power Systems,2009,24(2):859-867.
[6]ANAYA-LARA O,HUGHES F M,JENKINS N,et al.Contribution of DFIG-based wind farms to power system short-term frequency regulation[J].IEEE Proceedings-Generation,Transmission and Distribution,2006,153(2):164-170.
[7]MORREN J,DE HAAN S W H,KLING W L,et al.Wind turbines emulating inertia and supporting primary frequency control[J].IEEE Transactions on Power Systems,2006,21(1):433-434.
[8]ZHONG Q C,NGUYEN P L,MA Z,et al.Selfsynchronized synchronverters:inverters without a dedicated synchronization unit[J].Power Electronics,IEEE Transactions on,2014,29(2):617-630.
[9]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.