光伏并网逆变器自抗扰二自由度内模控制策略
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摘要
针对逆变器内环采用传统的一自由度内模控制无法兼顾系统跟随性和抗干扰的局限性,同时由于系统在同步旋转坐标系下不能实现彻底解耦、控制器设计依赖系统参数过强的问题,提出一种新型双闭环控制策略。其中,内环采用基于合成矢量的二自由度内模控制,既解决了系统因输入电感值不能实现彻底解耦的问题,又能保证并网电流同时具有较强的跟随性和抗干扰性;外环在基于瞬时功率平衡的思想上采用不依赖精确模型且强鲁棒性的自抗扰控制技术来保持直流侧电压的稳定,二者结合实现对并网逆变器的综合控制。仿真结果表明,所提控制策略比基于自抗扰的传统内模控制具有更好的动态、静态性能和抗干扰能力,以及更低的并网电流谐波含量。
The traditional internal model control (IMC) for the inner loop of the inverter cannot consider the limitations of system following and anti-interference. At the same time,a new double closed-loop control strategy is proposed because the system cannot achieve complete decoupling under the synchronous rotating coordinate system and the controller design relies on excessive system parameters. Meanwhile,the inner loop adopts two-degree-of-freedom IMC (2DOF-IMC) based on synthetic vector,which not only solves the problem that the system cannot be completely decoupled due to the input inductance value,but also ensures that the grid-connected current has strong following and anti-interference at the same time. The outer loop adopts the active disturbances rejection controller (ADRC) that does not rely on an accurate model and has strong robustness to maintain the stability of the DC side voltage based on the idea of instantaneous power balance,and the combination of the two realizes the integrated control of the grid-connected inverter. The simulation results show that the proposed control strategy has better dynamic,static performance and anti-interference ability than the traditional IMC based on active disturbances rejection controller,and lower grid-connected current harmonic content.
The traditional internal model control (IMC) for the inner loop of the inverter cannot consider the limitations of system following and anti-interference. At the same time,a new double closed-loop control strategy is proposed because the system cannot achieve complete decoupling under the synchronous rotating coordinate system and the controller design relies on excessive system parameters. Meanwhile,the inner loop adopts two-degree-of-freedom IMC (2DOF-IMC) based on synthetic vector,which not only solves the problem that the system cannot be completely decoupled due to the input inductance value,but also ensures that the grid-connected current has strong following and anti-interference at the same time. The outer loop adopts the active disturbances rejection controller (ADRC) that does not rely on an accurate model and has strong robustness to maintain the stability of the DC side voltage based on the idea of instantaneous power balance,and the combination of the two realizes the integrated control of the grid-connected inverter. The simulation results show that the proposed control strategy has better dynamic,static performance and anti-interference ability than the traditional IMC based on active disturbances rejection controller,and lower grid-connected current harmonic content.
引文
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[2]曾正,李辉,冉立.交流微电网逆变器控制策略述评[J].电力系统自动化,2016,40(9):142-151.Zeng Zheng,Li Hui,Ran Li.Comparison on Control Strategies of Inverters in AC Microgrids[J].Automation of Electric Power Systems,2016,40(9):142-151.
[3]Giampaolo Buticchi,Giovanni De Carne,Davide Barater,et al.Analysis of the frequency-based control of a master/slave micro-grid[J].Power E-lectronics Iet,2017,10(10):1570-1576.
[4]彭俊臻.超导磁储能在微电网中的应用研究[D].昆明:昆明理工大学,2014.
[5]张蕊萍,陈志强.电压型PWM整流器PI参数整定[J].电源技术,2014,38(5):941-942.Zhang Ruiping,Chen Zhiqiang.PI parameter setting of voltage type PWM rectifier[J].Chinese Journal of Power Sources,2014,38(5):941-942.
[6]周京华,刘劲东,陈亚爱,等.大功率光伏逆变器的低电压穿越控制[J].电网技术,2013,37(7):1799-1807.Zhou Jinghua,Liu Jindong,Chen Yaai,et al.Low voltage ride-through control of high power inverter for grid-connection of photovoltaic generation[J].Power System Technology,2013,37(7):1799-1807.
[7]倪福银,李正明.一种基于内模控制的光伏逆变器功率控制策略[J].电测与仪表,2015,52(20):76-80.Ni Fuyin,Li Zhengming.A power control strategy of photovoltaic inverter based on internal model control[J].Electrical Measurement&Instrumentation,2015,52(20):76-80.
[8]袁晓冬,楼冠男,陈亮,等.基于线性自抗扰的微电网平滑切换控制策略[J].电网技术,2017,41(12):3824-3831.Yuan Xiaodong,Lou Guannan,Chen Liang,et al.Control Strategy for Micro-grid Seamless Switching via Linear Active Disturbance Rejection[J].Power System Technology,2017,41(12):3824-3831.
[9]赵志诚,文新宇.内模控制及其应用[M].北京:电子工业出版社,2012.Zhao Zhicheng,Wen Xinyu.Internal Model Control and its Application[M].Peking:Publishing House of Electronics Industry,2012.
[10]褚衍超,黄守道,孔凡蓬,等.基于内模控制器的MMC-HVDC稳态控制[J].电网技术,2015,39(8):2223-2229.Chu Yanchao,Huang Shoudao,Kong Fanpeng,et al.Steady State Controlof MMC-HVDC System Based on Internal Model Controller[J].Power System Technology,2015,39(8):2223-2229.
[11]夏运霞,包启亮,李锦英.光电跟踪系统视轴稳定的鲁棒内模控制器设计[J].控制与决策,2013,28(7):1117-1120.Xia Yunxia,Bao Qiliang,Li Jinying.Design of robustness internal model controller for line of sight of photoelectric tracking system[J].Control and Decision,2013,28(7):1117-1120.
[12]陈高华,闫献国,赵志诚.位置伺服系统的分数阶二自由度内模控制[J].控制工程,2018,25(2):329-334.Chen Gaohua,Yan Xianguo,Zhao Zhicheng.Fractional Order Two Degree of Freedom Internal Model Control of Position Servo System[J].Control Engineering of China,2018,25(2):329-334.
[13]陈耀军,钟炎平.基于合成矢量的电压型PWM整流器电流控制研究[J].中国电机工程学报,2006,26(2):143-148.Chen Yaojun,Zhong Yanping.Study on the current control for voltagesource PWM rectifier using complex vectors[J].Proceedings of the CSEE,2006,26(2):143-148.
[14]韩京清.自抗扰控制技术:估计补偿不确定因素的控制技术[M].北京:国防工业出版社,2008.Han Jingqing.Active Disturbance Rejection Control Technique-the technique for estimating and compensating t-he uncertainties[M].Bejing:National Defence Industry Press,2008.