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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。
In view of the characteristics and requirements of substation in harmonic control, it is necessary to have a certain static and dynamic complement ability. Based on the analysis of the characteristics and shortcomings of traditional harmonic control methods, a new topology is proposed - resonant impedance hybrid active Filter (resonant impedance type hybrid active power filter, RITHAF). Based on the analysis of the fundamental working principle of RITHAF, different strategies of controlling voltage and current sources are deeply studied. It is pointed out that RITHAF has more excellent performance when it is controlled as current source. In order to analyze the performance of RITHAF, the harmonic source harmonic suppression function and grid harmonic suppression function are defined. Based on this, the influence of grid impedance variation and passive filter detuning on the compensation characteristics of RITHAF is studied. Simulation and experimental results show that, RITHAF has good harmonic control and reactive power compensation capability, suitable for medium and high voltage system.