hl2a装置水平场电源有源滤波器研究-study on active filter of horizontal field power supply in hl2a device.docx

AbstractHL-2A device radial field coil is supply by the 125MVA generator, and its effect is to control the vertical position of the plasma. Power supply of the radial field should provide DC voltage for the radial field coil; the AC voltage must be converted into a DC voltage through rectifier. Phase-controlled rectifier device will produce large amounts of harmonic currents in the system AC side; harmonic currents will bring larger line losses, accelerate aging of equipment, affect the stability of the system and cause a series of hazards. Therefore a filter is needed to be designed to control harmonic current of the radial field coil power supply.According to the characteristics of the power supply system of the HL-2A device，specific analysis should be done about the filtering device in different environment. According to the basic system and experimental data of the system, a detailed analysis should be done about the radial field power system, which is about frequency of power system, voltage harmonic and current harmonic. And a decision is made by the result of analyses; in this decision the appropriate filtering system should be selected. Finally it’s decided the parallel active filter will be used.In order to have a better understanding and design of parallel active filter, many works should be done. Based on principle of active filter, the mathematical model of the parallel active filter can be built in time-domain and dq0 rotating system. The design of active filter system can be carried out based on the analyses of the system, the parameters of the APF can also be calculated; such as the filter capacity, the DC-side for energy storage capacitor. This article describes several common harmonic detection methods and analyzes the advantages and disadvantages of the various methods, and ultimately determines the harmonic detection method based on instantaneous reactive power theory. Control strategy plays a decisive role in the actual effect of the active filte