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针对现有无功补偿装置动态性能差、结构复杂等缺点,提出一种新的无功补偿方法。将固定电容器与逆变器串联,根据相关经验公式及实际运行条件来确定元件参数,同时通过对连接电抗器的设计滤除输出电压中开关次谐波,达到动态调节的目的。仿真实验证实该装置无需外加滤波器即可具有注入系统的谐波含量小、动态性能好等特点。20kVar样机挂网运行后可将补偿支路的功率因数提高到0.95左右,能达到无功补偿的目的。
In view of the shortcomings of the existing reactive power compensation device such as poor dynamic performance and complicated structure, a new reactive power compensation method is proposed. The fixed capacitor and inverter in series, according to the relevant empirical formula and the actual operating conditions to determine the component parameters, and by connecting the reactor design filter output voltage switching sub-harmonics, to achieve the purpose of dynamic regulation. The simulation results show that the device has the advantages of small harmonic content and good dynamic performance without the need of an external filter. 20kVar prototype hanging network operation compensation branch can be increased power factor of about 0.95, to achieve the purpose of reactive power compensation.