电压源型电能质量控制技术研究

STUDY ON THE POWER QUALITY CONTROL TECHNIQUE OF SYNCHRONOUS VOLTAGE SOURCES

设计了应用于配电网的电压源型电能质量控制系统,该系统主要包括整流器、三相逆变器、控制器、电压电流检测电路等。研究了提高用户电压质量的电压无功控制规律,设计了抑制电压波动和闪变的控制系统,并分析了控制系统的稳定性以及控制作用与网侧阻抗的关系。给出了谐波电压模拟检测电路并对其幅频特性和相频特性进行了仿真计算。通过电能质量控制系统与电网间同步运行试验和谐波电压抑制试验,实现了逆变器与电网的同步运行控制以及负载谐波抑制控制。

This paper presents the design of a synchronous voltage source system to improve the power quality of the distribution network. The proposed system is composed of a rectifier, a three phase inverter, a controller and the voltage/ currents detection circuits. Control strategy and control methods stabilizing the voltage of power network are proposed. Stability and control effect associated with the node impedance are analyzed in details. A 50 Hz notch filter is designed to detect the harmonic voltage and the response plot for this circuit is simulated in the paper. The experimental results of proposed power quality control system in restraining harmonic voltage and of its synchronous operation with a power system are presented.