感应发电机全功率风电变换器的改进PR控制

AN IMPROVED PROPORTIONAL RESONANT CONTROL STRATEGY FOR FULL-SCALE WIND POWER CONVERTER WITH INDUCTION GENERATOR

在两相静止坐标系下采用改进的PR控制器实现对并网逆变器的控制,同时引入电容电流反馈实现了对LCL滤波器存在的固有电流谐振进行抑制控制,大大简化了并网逆变器控制算法的复杂性。通过实验对所提出的控制策略进行验证,实验结果表明,所提出的控制策略能控制感应全功率风电机组平稳发电运行,具有功率因数调节方便、无冲击并网等优点。

An improved proportional resonant （PR） control strategy was introduced to control the grid connection inverter and the current resonant problem brought by the LCL filter of grid inverter was solved by using the capacitor current feedback in the static coordinate. Since the extra coordinate transformation from the static coordinate to the rotation coordinate was not necessary, so the digital realization process become very easy. The experiment was performed to verify the correction of the presented control strategy and the experimental results showed that the whole system has merits of easy adjustment of grid power factor and none flashing current to the grid.