The Research Of Soft-switching Technology For Active Harmonic Compensator

Active harmonic compensator is advanced power electronics equipment, which can be used for integrated compensating equal-vdtoge and equal-currents. Compared with some conventional measures, active harmonic, compensator has many advantages and favorable prospects. The soft-switching actine harmonic compensator have excellent performances in respect in respect of reliability and the waste of power.The paper analyses the principle of the work, action mode and performance about quasi-res-onant converters, ZCS-PWM converters, ZVS-PWM converters, ZCT-PWM converters are used of the high-paver of active harmonic compensator.The principles of active harmonic compensator, especially the component of the control system circuit and work mode, have been introdwced in this paper.Studies on the main circuit and control scheme of ZVT soft-switch three-phase converter are introduced in this thesis. The topology of soft-switching, use a converting current switch, which have the characteristics of simple structure, low cost, easy control. A topology and its control strategy of soft-switch are discussed. Using positire-negative negative sequece sawtooth scarier wave with alternate slope is convenient for the realizatine of soft-switching. The operation patlerns of the proposed soft-switching topology are analyzed in detail, and the control strategy of this system are given. The paper provides the determining rule of the active harmonic compensator's frequency, as well as parameter computational method of alternative side reactor and direct current side capacitor. Also the text carries on the discussion for the design method of the actuate circuit, the cushion circuit and the protection circuit.