APF basic principle of active power filter harmonic control, is the use of modern power electronics and electric power based on a new harmonic control equipment speed DSP digital signal processing technology, the device is made of. 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, separation of the harmonics of the fundamental harmonic control equipment manufacturers, and pulse-width modulation (PWM) signal in the form of compensation current generation circuit to send the drive pulse, the drive IGBT or IPM power modules, generates harmonic currents equal in magnitude, opposite polarity compensation harmonic current injection control equipment, Harmonic current compensation or offset, the initiative to eliminate power harmonics. Active power filter connected to the grid in parallel independently controlled in parallel, will not happen because of mechanical failure caused the grid power outage. YW-APF multiple parallel active power filter harmonic control system technology, if a quit running due to malfunction, the remaining machines still work to achieve filtering. Independent control of three-phase current independent control of each phase current, single-phase injection current, regardless of system phase current imbalance affect the neutral filtering capacity of triple-phase lines. IP protection rating IP protection and lightning protection class IP20; lightning protection capability 20kA. Harmonic governance programs, Guancheng harmonic control, electrical and mechanical learning Connaught Connaught study by Henan Mechanical and Electrical Equipment Co., Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) strong, credible, in Zhengzhou, Henan electronics, electrical products processing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Connaught Electrical and Mechanical study into the brilliant and you work for a better future!