Research On Static Inverter And Series Hybrid Active Power Filter Based On Dual-BUCK Topology

Along with the constant development of the aviation industry, the requirements of aircraft and electrical equipment to power system performance are higher and higher, mainly reflected in two aspects: 1,Power must have high reliability, high efficiency of transformation, the light weight and small size. 2,the power quality must be good.Firstly this paper introduces a Single-phase Half-Bridge Dual Buck Inverter,Analyzes its continuous current mode and discontinuous current mode,and gives the critical continuous conditions. A single current detection method of SPHBDBI was researched. This mothod could save the cost of the inverters,without affecting other performance of the inverters. A load current feedback control method was researched. In the high-power inverter the method could effectively improve static characteristics of the inverters. the design principles and optimum design methods of the SPHBDBI output filter was pointed out,the filter which was designed increased electrical performance of the inverters, reduced the size and weight of the inverters.Then a Three-phase Half-Bridge Dual Buck Inverter was introduced. The topology and the control method of TPHBDBI were clarified. The degree of output voltage imbalance was researched on phase unbalanced load and line unbalanced load. A maximum unbalanced condition of three-phase output voltage is given. The requirements of the balance of the three-phase output voltage to a three-phase reference were analyzed. The method which how to increase the accuracy of the amplitude and phase of three-phase reference was pointed out. The influence of control parameter to three-phase output voltage imbalance was researched. Through adjusting the control parameters,the balance of three-phase output voltage could be improved.In addition,the applications of more and more airborne electronic equipment made the harmonic pollution of aeropower becoming increasingly serious. If these harmonic problem is not solved,great dangers would be brought to the safe operation of aircraft. Most of the current researches on Hybrid Active Power Filter are designed for the power grid of 50Hz constant frequency, but variable frequency AC power now is the development trends of main aeropower supply. Therefore this paper introduces an Aeronautic Series Hybrid Active Power Filter which fit for varity-frequency power supply , and expounds ASHAPF's System Components, control strategies and harmonic suppression principle. The relationship of Active rating whith power frequency,the capacitor of PPF,loads was researched. Based on analyzing the load characteristics,the main design principles of filter parameters are given. The differences between the inverter used in ASHAPF and used in sourse were analyzed. How to improve the current control inverter's capability of anti-disturbance with harmonic voltage was proposed. A current detection method based on the principle of distinguish phase was adopted. The use of DSP realized real-time detection of fundamental current.