【摘要】 由于传统三相空间矢量脉冲宽度调制(SVPWM)并网逆变器的电网电流解耦控制方法,是通过电网电流负的交轴分量和正的直轴分量分别乘以总滤波电感感抗后加到直轴和交轴电流控制器的输出上实现的,因此,电网电流的直轴和交轴脉动分量会影响电网电流的波形质量;同时,三相桥臂直轴和交轴参考电压无法直接反映电网参考电流的变化,从而导致系统动态响应速度慢。为了解决上述问题,可将参考电流的直轴和交轴分量分别代替电网电流控制器解耦分量中的电网电流直轴和交轴分量。详细阐述了传统和改进解耦控制方法的工作原理,并以一台15kVA的三相SVPWM并网逆变器为例进行了实验验证。与传统解耦控制方法相比,改进解耦控制方法具有电网电流波形质量高、功率脉动小、动态响应速度快等优点。更多还原

【Abstract】 As the traditional decoupling control method of d-and q-axis components of the grid current is realized by adding the minus q-axis and positive d-axis components of the grid current multiplying inductive reactance of the total filter inductance into the output of the grid current controller,respectively,the grid-connected inverter has poor waveform quality of the grid current.As the three-phase-leg voltage cannot directly reflect the change of the reference grid current with the traditional decoupling control method,the grid-connected inverter has slow dynamic response.In order to solve the problems,the d-and q-axis components of the grid current in the decoupling components of the grid current controller is substituted by that of the reference grid current.The operating principle of the traditional and improved decoupling control methods is illustrated.Experimental results on a 15 kVA three-phase grid-connected inverter with SVPWM verify the theoretical analysis.Compared with the traditional decoupling control method,the grid-connected inverter with the improved decoupling control method has high waveform quality of the grid current,small ripple power and fast dynamic response.更多还原