【摘要】 针对电网不平衡情况下的功率波动和三相功率分配不均造成的电流畸变,提出一种电流内环、功率外环的恒频直接功率控制方法。首先检测电网电压和电流,并分离出正负序分量;然后在正负序旋转坐标下,算出瞬时功率及瞬时电流与给定值的误差,根据误差得到空间矢量控制的参考电压。通过Matlab仿真和实验证明,该方法能有效抑制电网不平衡带来的功率波动和电流畸变。更多还原

【Abstract】 Constant frequency control method for current inner loop and power outer loop is proposed to address the current distortion caused by the power fluctuation and uneven distribution of three-phase power caused by unbalanced grid. The steps are as follows: detect grid voltage and current and separate positive and negative sequence components; calculate the deviations of instantaneous power and instantaneous current from the given values in rotating coordinates;calculate the reference voltage of space vector control according to deviations. According to Matlab simulation and experiment, this method can effectively suppress the power fluctuation and current distortion caused by unbalanced grid.更多还原