谐振阻抗型混合有源滤波器的原理及其补偿特性

Principle and Compensation Characteristics of Resonant Impedance Type Hybrid Active Power Filter

针对变电站在谐波治理的同时需要具备一定的无功静补能力的特点和要求,在分析传统谐波治理方法特点和不足的基础上,提出一种新型拓扑结构——谐振阻抗型混合有源滤波器(resonant impedance type hybrid active power filter,RITHAF)。在对RITHAF基本工作原理进行分析的基础上,深入研究其控制为电压源和电流源的不同策略,指出将RITHAF控制为电流源时具有更加优良的性能。为对RITHAF性能进行分析,定义谐波源谐波抑制函数和电网谐波抑制函数,并以此为指标研究电网阻抗变化、无源滤波器失谐对RITHAF补偿特性的影响。仿真及实验结果表明,RITHAF具有良好的谐波治理和无功补偿能力,适用于中高压系统的应用。

According to the demands in both var compensation and harmonic suppression, a novel power filter topology named resonant impedance type hybrid active power filter （RITHAF） is proposed in this paper, based on the deficiency analysis of traditional methods. With the basic principle analysis of RITHAF, strategies for controlled voltage source and controlled current source are deeply studied. RITHAF has a better performance when controlled as a current source. Furthermore, harmonic suppression functions are defined in order to study the characteristics of RITHAF, with which the influences of power grid impedance changes and passive power filter detuning are analyzed. Finally, the simulation and experimental results show that RITHAF has excellent properties in harmonic suppression and var compensation, and is suitable for applications in medium and high voltage systems.