Investigation Of Dual Space Vector Modulation On Matrix Converter

MC (Matrix Converter) as one type of general power converter, can realize n phase to m phase voltage conversion。It can provide sinusoidal output voltages with varying amplitude and frequency, at the same time, drawing sinusoidal input currents with unity power factor. Moreover, it can render bi-directional power flow without energy storage components except small AC filters for elimination of switching ripples By means of changing the control algorithm, the MC functions as rectifier, inverter, converter, etc. Moreover, according to the research achievement of electronics, computer science and Control Theory,high quality of four-quadrant operation of Variable Frequency Power without power grid pollution will probably be achieved. As a result, due to above mentioned characteristics, MC attracts many researchers'interests to investigate on power conversion by means of different new technical issues.First, The equivalent structure of the AC-DC-AC conversion is analyzed. Then the AC-AC direct transformation control rule of matrix converter is deduced by adopting the dual space vector control strategy of MC, which is combined output line voltage space vector modulation and input phase current space vector modulation. This method meets the demand of input sinusoidal current and output sinusoidal voltages. The input side positive and negative power factor angle are adjusted arbitrary. low harmonic is suppressed in a degree. The strategy is advanced in the future.The hardware experiment plat of matrix converter control system is build based on DSP. The main circuit consists of nine bi-directional switches, There are two IGBTs and two diodes in every bi-directional switch. The four-step commutation is introduced to achieve security commutation between switches. This strategy can be carried out with CPLD to prevent the source short and the load open.The reactive power transferring, controlling and bi-directional power flowing of matrix converter is also discussed in this thesis. It indicates that input reactive power has a variable range. The energy transforming mechanics of...