The three-phase inverter current decoupled synchronous rotating coordinate transformation control method based on the invention, for the grid connected inverter with LCL filter, using coordinate transformation to inverter three-phase output current signal and the grid side current signal is converted to three-phase synchronous rotating coordinate system in two orthogonal current signal, and the two group of orthogonal weighted current signal the average value as feedback signal and control signal of the inverter current decoupling in the rotating coordinate system, compares the feedback signal and the control signal given, the error signal obtained by proportional integral control, do a combination of computing and signal decoupling, get coordinate pulse duty ratio signal control operation of three-phase inverter switch, thereby the output current waveform and amplitude control of grid connected inverter. The method of the invention can effectively solve the problems of signal coupling control LCL filter inverter three-phase current, enhance the independent control of each phase of output current, the output current waveform of grid connected system get good.
【技术实现步骤摘要】
本专利技术涉及三相并网逆变器控制方法,尤其是基于旋转坐标变换的三相并网逆变 器电流解耦控制方法。
技术介绍
具有LCL滤波的三相并网逆变电源,其主电路和控制框图参见附图说明图1所示,通常包 括基于高频开关的三桥臂三相逆变电路、用于逆变并网连接的三相LCL低通滤波器(三相 对称)、三相电流变送器与电流检测电路以及逆变控制器,其中逆变控制器包含了电流控制 环和PWM脉冲发生器,在并网运行时为输出电流控制,以保证并网发电的电能质量。由于 三相电流相互关联,可以将三相电压和电流通过同步旋转坐标变换从ABC三相静止坐标 系转换到dq两相同步旋转坐标系内,以便于对基波信号做更好的控制。经过同步旋转坐 标变换后,LCL滤波三相并网逆变输出电路模型如图2所示。其中,L1为逆变侧电感L1A、 Lib> Lic的电感量,L2为电网侧电感L2A、L2B、L2C的电感量,C为滤波电容Ca、Cb、Cc的电容量, 正交信号(ild,ilq)和(i2d,i2q)分别为逆变侧三相电感电流(i1A,i1B,ilc)和电网侧电感电 流(i2A,i2B,i2C)经同步旋转坐标变换后在dq两相坐 ...
【技术保护点】
1. 基于同步旋转坐标变换的三相并网逆变器电流解耦控制方法,包括三相并网逆变器主电路、三相电流检测电路(4)和逆变控制器,其中三相并网逆变器主电路包含了基于高频开关的三桥臂三相逆变电路(1)和用于逆变并网连接的三相LCL低通滤波器(2)两部分,三相电流检测电路(4)包含了用于三相LCL低通滤波器逆变侧电感电流检测和电网侧电感电流检测的两组电流变送器(3),逆变控制器包含了从ABC三相静止坐标系到dq两相同步旋转坐标系的变换、信号误差计算和比例积分调节、去耦运算的电流控制环(5)和PWM脉冲发生器(6),其特征在于由电流控制环(5)对三相LCL低通滤波器逆变侧电感电流信号和电 ...
【技术特征摘要】
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