APF basic principle of active power filter harmonic treatment method is the use of new power harmonic control equipment of modern power electronics and high-speed DSP devices are based on digital signal processing technology made. It is composed of two major parts of the circuit generated by the command current computing circuit and compensation current. Command current computing circuit current in the line real-time monitoring, and analog current signals into digital signals into high-speed digital signal processor (DSP) for signal processing, the harmonics of the fundamental separation and pulse width modulation ( PWM) signal in the form of compensation current circuit occurs to send drive pulses to drive IGBT or IPM power modules generate harmonic currents with equal amplitude, polarity opposite compensation current into the power grid, the harmonic current compensation or offset initiative to eliminate Power harmonics. BDKJ-FC type II compensation device main purpose and scope of application of high voltage shunt filter compensation package (hereinafter referred to as the device) it is mainly used for frequency 6kV, 10kV, three-phase power system harmonic treatment offer 20KV, 35kV, and to suppress the harmonic grids wave harmonic control devices production, adjustment, balance the grid voltage, improve power factor, reduce losses and improve power quality. Harmonic control theory, learning Connaught Electrical and Mechanical (certification), the Yellow River Road harmonic control is provided by conventional Connaught Mechanical and Electrical Equipment Co., Ltd., Henan. Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) is Zhengzhou, electronics, electrical products processing leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In practice Connaught Electrical and Mechanical leadership with the staff warmly welcome all inquiries negotiations to create learning Connaught Electrical and Mechanical better future.