抽水蓄能电站发电机静态启动变频直接谐振控制方法

Frequency Conversion Direct Resonance Control Method for Static Starting of Generator in Pumped Storage Power Station

电机静态启动时,低次谐波向高次谐波的转换的正负分量对立且不同步,容易造成运行参数判定失误,机体运行不稳,谐振问题严重等后果。由此,提出一种直接谐振控制方法。抽水蓄能电站发电机启动时,低次谐波向高次谐波转换,据此建立静态启动模型,分析每次启动时电机基础波、负序谐波以及负序谐波的变化,确定内部转子和定子运作频次,即谐振的运作频次,根据相对运动关系,获取实时的谐振变化参数,求解与其存在正相关的电流和电压变化值,采用解耦控制器对电流电压实行上调和下调,完成自动控制。实验证明,在感性、容性以及阻性负载下,控制精准度高。恒定输出各项正负分,优化运行参数,保证抽水蓄能电站发电机运行稳定。

When the motor is started statically,the positive and negative components of the conversion from low order harmonics to high order harmonics are opposite and not synchronized,which is easy to cause errors in the judgment of operating parameters,unstable operation of the machine body,serious resonance problems and other consequences.Therefore,a direct resonance control method is proposed.When the generator of the pumped storage power station starts,the low order harmonic is converted to the high order harmonic.Based on this,a static starting model is established to analyze the changes of the basic wave,negative sequence harmonic and negative sequence harmonic of the motor at each start,determine the operating frequency of the internal rotor and stator,that is,the operating frequency of the resonance.According to the relative motion relationship,obtain the real-time resonance change parameters,and solve the current and voltage changes that are positively related to them.The decoupling controller is used to adjust the current and voltage up and down to complete automatic control.Experiments show that the control accuracy is high under inductive,capacitive and resistive loads.Constant output of positive and negative points,optimization of operating parameters,ensure the stable operation of pumped storage power station generator.