通用电能质量控制器直流侧电压控制建模与分析

为了对通用电能质量控制器直流侧电压进行更为有效的控制,提出一种用于三相三线通用电能质量控制器(UPQC)直流侧电压控制的外环模型。在所得模型的基础上利用经典控制理论分析了实际UPQC的补偿能力;并通过分析抗扰动性能,采用比例积分调节器时电压环稳定性以及采用比例调节器时电压环稳定性,详细比较了直流侧电压的两种控制方法——反馈控制和复合控制(反馈加前馈控制)。仿真和实验结果验证了UPQC的最大补偿能力,同时表明复合控制具有较好的抗扰性能,以及在比例调节器下具有较好的相对稳定性。

Modeling and Analysis of DC Link Voltage Control for Universal Power Quality Controllers

In order to make more effective control of universal power quality controllers (UPQC), an outer loop model for the voltage loop in a three-phase three-wire UPQC is proposed in the paper. The compensation capability of a practical UPQC is then analyzed based on the deduced model. Subsequently, two kinds of methods named feedback control and composite control for DC link voltage control are compared in detail. The covered comparative aspects include the performance in disturbance suppression, stability of the voltage loop with a PI controller and stability of the voltage loop with only a P controller. Computer simulations and hardware prototype experiments are done to verify the validity of the model and analysis in this paper. The corresponding control methods are also proved to be effective.