【摘要】 针对三相电网存在三相电压不平衡,造成电机的电流畸变,影响异步电机的磁链形成和转矩性能,提出了基于正序d-q坐标系抑制电机逆变器网侧负序电流的不平衡控制策略。在分析异步电机直接转矩控制的基础上,详细推导出三相不平衡电网的控制算法;提出了采用前馈解耦的电压空间矢量控制(SVPWM)算法,抑制电网负序的引起的电流畸变,克服了对感应电机的转矩脉动影响。给出了一个1 kW感应电机直接转矩控制试验结果,证明了该策略能有效地抑制电网电压不平衡运行时对异步电机逆变器的网侧电流畸变影响,提高了系统运行性能。更多还原

【Abstract】 Three-phase power for the existence of three-phase voltage imbalance,resulting in distortion of motor currents,affecting the formation of induction motor flux and torque performance is proposed based on positive sequence coordinates inhibit motor inverter network side of the negative sequence current imbalance in control strategy.By analyzing the direct torque control of induction motors based on the three-phase unbalanced power is derived in detail the control algorithms;Made use of feed-forward decoupling of voltage space vector control(SVPWM) algorithm,suppression of the power grid caused by the negative sequence current distortion,to overcome the torque pulsation of induction motor effects.Gives a 1kW induction motor direct torque control test results show that the strategy can effectively inhibit the run-time power grid voltage unbalance on induction motor inverter-side current distortion of the net impact of enhancing the system performance.更多还原