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电动汽车大功率快速充电采用直流供电方式,前级整流器产生的电压纹波不仅使蓄电池中出现过电压和过电流,降低电池寿命,还会降低后级DC-DC斩波器运行的稳定性,影响充电质量。因而,将整流器输出的电压纹波限制到规定的水平至关重要。以非线性、强耦合的三相桥式PWM整流器为研究对象,将自抗扰控制技术引入整流器控制中。对系统在两相同步旋转d-q坐标系下进行建模,并采用电压电流双闭环控制,根据直流侧输出电压与d轴电流的关系,将自抗扰控制器应用于电压外环控制中,利用PSCAD对系统进行仿真,与传统PI控制器的仿真对比表明,自抗扰控制器能够快速、准确地跟踪输出指令,降低输出电压纹波,提高系统的动态特性,且具有较好的抗负载扰动能力。
Rapid charging of electric vehicles with high-speed DC power supply, pre-rectifier voltage ripple generated not only in the battery over-voltage and over-current, reducing battery life, but also reduce the stability of DC-DC chopper operation, Affect the charging quality. Therefore, it is important to limit the voltage ripple output by the rectifier to the specified level. Taking the nonlinear and strongly coupled three-phase bridge PWM rectifier as the research object, the ADRC technology is introduced into the rectifier control. The system is modeled in a two-phase synchronous rotating dq coordinate system, and the voltage-current double closed-loop control is adopted. Based on the relationship between the DC output voltage and the d-axis current, the ADRC controller is applied to the voltage outer loop control. PSCAD simulation of the system, compared with the traditional PI controller simulation shows that the ADRC controller can quickly and accurately track the output command to reduce the output voltage ripple, improve the dynamic characteristics of the system, and has good anti-load disturbance ability.