【摘要】 研究了基于两相静止坐标系中的脉宽调制整流器数学模型。针对电网电压畸变需要捕获电压频率和相位的问题,提出了一种基于坐标变换理论的新型数字锁相环,介绍了锁相环的基本构成以及系统的工作原理。仿真结果表明:三相电压型脉宽调制控制系统,可实现单位功率因数运行,锁相环能够很好地跟踪系统频率的变化,从而实现相位的锁定。解决了传统锁相环因三相电网电压频率漂移而引起的相位不同步问题,对工程实际有指导意义。更多还原

【Abstract】 The mathematical model of three-phase PWM rectifier based on two-phase stationary frame was re-searched.In order to trap voltage frequency and phase in allusion to the distortion of network voltage,a new digital phase-locked loop on frame transformation theory had been put forward,in which basic construction and implemen-tation principle were introduced.The results of simulation showed that the control system of three-phase voltage PWM could realize the operation of unity-power factor.Phase-locked loop could track changes of system frequency so well that it could realize phase locking,solving the phase out-sync problem because of frequency jitter.So it had the supervised meaning on engineering.更多还原