基于改进型双闭环控制的并网逆变器惯性模拟方法及其物理机制研究
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摘要
针对分布式电源大规模接入导致电力系统转动惯量减少的问题,基于静止同步发电机模型,在常规电压电流双闭环控制的基础上,通过在电压外环上并联惯性控制器的方法,使得内环电流指令中增加大小可调的惯性电流成分,以实现逆变器惯性特性的等效模拟。此外,还从电路模型的角度研究了并网逆变器惯性模拟方法的物理机制,揭示了逆变器惯性模拟方法的物理本质。实验结果表明:该方法能有效实现对并网逆变器惯性水平的灵活调控,增强并网逆变器的稳定运行能力。
A large amount of distributed generation is connected to the grid,thus reducing the rotational inertia of the power system. Based on the static synchronous generator model,this paper introduces an inertia controller on the outer voltage control loop to enhance the grid inertia. The developed inertia controller can generate the inertial current superposed in the conventional current reference. The inertial current can be adjusted arbitrarily,consequently realizing the equivalent simulation of inverter inertia on the basis of the conventional double-loop control. In addition,the physical mechanism of the inertia simulation method for the grid-connected inverters is investigated from the point of circuit model,meanwhile,its physical essence is revealed. The experimental results show that the presented method can adjust the inertia of grid-connected inverters flexibly and can enhance the stable operation of system.
A large amount of distributed generation is connected to the grid,thus reducing the rotational inertia of the power system. Based on the static synchronous generator model,this paper introduces an inertia controller on the outer voltage control loop to enhance the grid inertia. The developed inertia controller can generate the inertial current superposed in the conventional current reference. The inertial current can be adjusted arbitrarily,consequently realizing the equivalent simulation of inverter inertia on the basis of the conventional double-loop control. In addition,the physical mechanism of the inertia simulation method for the grid-connected inverters is investigated from the point of circuit model,meanwhile,its physical essence is revealed. The experimental results show that the presented method can adjust the inertia of grid-connected inverters flexibly and can enhance the stable operation of system.
引文
[1]Liansong Xiong,Fang Zhuo,Feng Wang.Static synchronous generator model:a new perspective to investigate dynamic characteristicsand stability issues of grid-tied PWM inverter[J].IEEE Transactions on power electronics,2016,31(9):6264-6280.
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[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.
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[12]张兴,朱德斌,徐海珍.分布式发电中的虚拟同步发电机技术[J].电源学报,2012,(3):1-6.
[13]Alipoor J,Miura Y,Ise T.Power system stabilization using virtual synchronous generator with alternating moment of inertia[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2015,3(2):451-458.
[14]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,(16):2591-2603.
[15]Bevrani H,Ise T,Miura Y.Virtual synchronous generators:a survey and new perspectives[J].International Journal of Electrical Power&Energy Systems,2014,54(1):244-254.
[16]熊连松,刘小康,卓放,等.光伏发电系统的小信号建模及其控制器参数的全局优化设计方法[J].电网技术,2014,(5):1234-1241.
[17]熊连松.静止同步发电机理论及其在并网逆变器稳定性分析中的应用[D].西安:西安交通大学,2016.
[18]曾正,邵伟华,宋春伟,等.电压源逆变器典型控制方法的电路本质分析[J].电机工程学报,2016,(36):4980-4984.
[2]侍乔明,王刚,马伟明,等.直驱永磁风电机组虚拟惯量控制的实验方法研究[J].中国电机工程学报,2015,35(8):2033-2042.
[3]王刚,侍乔明,崔志勇,等.一种风力机虚拟惯量控制与传统发电机调速控制的协调方法[J].电网技术,2015,39(10):2033-2042.
[4]陈宇航,王刚,侍乔明,等.一种新型风电场虚拟惯量协同控制策略[J].电力系统自动化,2015,39(5):27-33.
[5]De Almeida RG,Peas Lopes JA.Participation of doubly fed induction wind generators in system frequency regulation[J].IEEE Transactions on Power Systems,2007,22(3):944-950.
[6]Mauricio JM,Marano A,Gomez-Exposito A,et al.Frequency regulation contribution through variable-speed wind energy conversion systems[J].IEEE Transactions on Power Systems,2009,24(1):173-180.
[7]田新首,王伟胜,迟永宁,等.基于双馈风电机组有效储能的变参数虚拟惯量控制[J].电力系统自动化,2015,39(5):20-26.
[8]张祥宇,付媛,王毅,等.含虚拟惯性与阻尼控制的变速风电机组综合PSS控制器[J].电工技术学报,2015,30(1):159-169.
[9]杜威,姜齐荣,陈蛟瑞.微电网电源的虚拟惯性频率控制策略[J].电力系统自动化,2011,35(23):26-31.
[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.
[11]Shintai T,Miura Y,Ise T.Oscillation damping of a distributed generator using a virtual synchronous generator[J].IEEE Transactions on Power Delivery,2014,29(2):668-676.
[12]张兴,朱德斌,徐海珍.分布式发电中的虚拟同步发电机技术[J].电源学报,2012,(3):1-6.
[13]Alipoor J,Miura Y,Ise T.Power system stabilization using virtual synchronous generator with alternating moment of inertia[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2015,3(2):451-458.
[14]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,(16):2591-2603.
[15]Bevrani H,Ise T,Miura Y.Virtual synchronous generators:a survey and new perspectives[J].International Journal of Electrical Power&Energy Systems,2014,54(1):244-254.
[16]熊连松,刘小康,卓放,等.光伏发电系统的小信号建模及其控制器参数的全局优化设计方法[J].电网技术,2014,(5):1234-1241.
[17]熊连松.静止同步发电机理论及其在并网逆变器稳定性分析中的应用[D].西安:西安交通大学,2016.
[18]曾正,邵伟华,宋春伟,等.电压源逆变器典型控制方法的电路本质分析[J].电机工程学报,2016,(36):4980-4984.
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