摘要:采用一种改进型直接功率控制方法用于三相电压型双PWM整流侧,用以解决传统直接功率控制所用开关矢量表无功功率脉动较大的问题,并且将其用于双PWM变频调速系统,逆变侧采用基于SVPWM的矢量控制策略,控制对象为永磁同步电机,整流侧与逆变侧采用负载功率前馈的协调控制策略,避免了传统独立控制策略动态响应慢的缺点。最后,通过Matlab/Simulink仿真,结果表明,电机的稳态响应和动态响应良好,直流母线电压可调,网侧电流谐波小,功率因数接近于1,并且无功功率的脉动较传统直接功率控制有了明显的改进。 关键词:双PWM;直接功率控制;负载功率前馈;变频调速系统;无功功率脉动
Abstract: Using a modified direct power control method for threephase voltage dual PWM rectifier side to solve the problem that switching table in traditional direct power control has large reactive power fluctuation, and it is also used for variablefrequency speed control system.Adopting vector control strategy based on SVPWM in inverter side and permanent magnet synchronous motor for control object. rectifier and inverter side adopted the control strategy of load power feedforward,which avoided the shortcoming of slow dynamic response of traditional independent control strategy.Finally,though the Matlab/Simulink,the results show that good steadystate and dynamic response of the motor, adjustable DC bus voltage,small grid current harmonic ,unit power factor closely.In addition,reactive power impulse has obvious improvement compared with traditional direct power control. Key words:dual PWM;direct power control;load power feedforward;variablefrequency speed control system;reactive power fluctuation
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