基于Park变换的单相逆变器静态前馈补偿控制策略
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摘要
针对单相光伏逆变器在双闭环控制系统中电流环采用典型Ⅰ型系统时存在抗干扰性能差的缺点,提出了一种新的电流内环静态前馈补偿控制策略。通过改进的Park变换,获得单相逆变器的等效模型,在等效逆变器模型中利用前馈解耦控制的方法得到电流的控制方程,在典型Ⅰ型电流内环控制系统中加入具有静态前馈补偿控制环节的方法抑制电流内环的干扰信号。通过SIMULINK仿真可以得出,具有静态前馈控制的电流内环控制器对比采用典型Ⅰ型系统控制器的静态性能和动态性能均良好,有效提高了电流环的抗干扰性能。
Aiming at the existing disadvantages of inferior anti-interference ability when the current loop of single-phase photovoltaic inverter adopts the typical I-type system in double closed-loop control system, this paper proposed a kind of new static feed-forward compensation control strategy for current loop. Through the improved Park transformation, the equivalent model of the single-phase inverter was obtained. In the equivalent inverter model the feed-forward decoupling control method was used to get the control equation of the currents. For the interference signal in the current control equation, the static feed-forward compensation control method was used to eliminate the interference signal present in the inner loop of the current. The SIMULINK simulation shows that for the current loop with the static feedforward control,the static property of typical I-type system controller was the same as that of dynamic property, which effectively improves the anti-interference ability of the current loop.
Aiming at the existing disadvantages of inferior anti-interference ability when the current loop of single-phase photovoltaic inverter adopts the typical I-type system in double closed-loop control system, this paper proposed a kind of new static feed-forward compensation control strategy for current loop. Through the improved Park transformation, the equivalent model of the single-phase inverter was obtained. In the equivalent inverter model the feed-forward decoupling control method was used to get the control equation of the currents. For the interference signal in the current control equation, the static feed-forward compensation control method was used to eliminate the interference signal present in the inner loop of the current. The SIMULINK simulation shows that for the current loop with the static feedforward control,the static property of typical I-type system controller was the same as that of dynamic property, which effectively improves the anti-interference ability of the current loop.
引文
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[9]杜强,高锋阳,乔垚,等.功率前馈的准Z源光伏并网逆变器Quasi-PR控制[J].高电压技术,2017,43(10):3322-3329.
[2]王恒利,付立军,揭贵生,等.采用比例谐振和状态反馈的三相逆变器最优控制[J].西安交通大学学报,2013,47(8):127-132.
[3]李浩然,杨旭红,薛阳,等.基于模糊PI参数自整定和重复控制的三相逆变器并网研究[J].电机与控制应用,2015,42(2):31-36.
[4]沈定坤,王卫星,徐军,等.基于坐标变换的单相光伏并网逆变器研制[J].电力电子技术,2013,47(1):55-57.
[5]YE Y,KAZERANI M,QUINTANA V H.A Novel Modeling and Control Method for ThreePhase PWM Converters[C]//IEEE Annual Power Electronics Specialists Conference,2001.
[6]杨旭红,王毅舟,王创典,等.基于重复控制和模糊PI控制的Z源逆变器并网研究[J].电机与控制应用,2016,43(5):22-27.
[7]吴浩伟,段善旭,徐正喜.一种新颖的电压控制型逆变器并网控制方案[J].中国电机工程学报,2008,28(33):19-24.
[8]游洵,刘芙蓉.带升压变压器的光伏并网逆变器控制与实现[J].可再生能源,2017,35(2):259-263.
[9]杜强,高锋阳,乔垚,等.功率前馈的准Z源光伏并网逆变器Quasi-PR控制[J].高电压技术,2017,43(10):3322-3329.