【摘要】 首先介绍了转子变频的主电路和工作原理,并指出其优点。由于引入了PWM整流技术,使得串级调速系统的功率因数得到提高,谐波含量也大大减少。其次采用状态空间平均法建立了斩波器的小信号模型,从而得到了斩波器的传递函数,此外还对基于PWM整流技术的有源逆变功率因数补偿原理进行了分析。最后给出了实验波形,验证了数学模型和控制策略的可行性。更多还原

【Abstract】 The main circuit and principle of rotor-side variable frequency driving system were proposed firstly.At the same time,its advantage was given.The PWM converter is adopted,so the power factor is increased and the harmonic is decreased.Then the small signal model of chopper by using the state-space averaging approach is presented and the transform function is got.Furthermore,active inverter power factor compensate principle based on the PWM converter is analyzed.Finally,the experiment results demonstrate the feasibility of the mathematics model and control strategy.更多还原