Sliding Mode Variable Structure Control Of Matrix Converter And Application

Wind energy is a new energy which is green non-polluting and has the development utilization of relatively high value.Recently,the mainly form of using wind energy is wind power,Great efforts to develop wind power technology is of great significance to the sustainable economic development. Matrix converter(MC) is a new kind of AC-AC power converter, it’s topology is simple, it can achieve AC/AC, DC/DC and other transformation, it’s able to obtain a sinusoidal output voltage and input current, input power factor is adjustable, no middle storage link, energy can flow in both directions,and it also can achieve a true four-quadrant operation and other a number of advantages.Study the topology of Matrix Converter,mathematical mechanism, basic working principle, converter technology, structure of two-way switch,power transfer etc. Instantaneous dual voltage synthesis method and space vector modulation were analyzed, by each of the modeling and simulation, summary the advantages and disadvantages.To suppress the distortion of the output voltage and input current waveform of matrix converter (MC),proposed a space vector modulation sliding mode variable structure closed-loop control method.Establish and simplify the state space model of the MC, design the sliding surface based of switching rules and the controlled output voltage, ensure that the system can quickly reach the sliding mode motion stage.Select the space vector form, calculate the amplitude deviation after correction of the voltage space and pieces of angular deviation after correction in the angle of the vector sector. According to the size of the actual output voltage and the desired output voltage of the MC,calculate the corresponding deviation between the rotating voltage space vector, after dealing with this deviation by the sliding mode controller, added it to the switch modulation matrix of the next sampling period as a negative feedback, achieve the closed-loop control of the system. The correctness of the control system is analyzed by using the Simulink of the Matlab software simulation.This chapter analyzed the feature of reactive power and active power energy transfer of MC and its control principle.Use the brushless doubly-fed wind power generation control system of excited by Matrix Converter.Analyzed the Working principle of BDFM and Variable speed constant frequency generation of the basic principles of BDFWG. Constructed the brushless doubly-fed wind power generation system experimental platform of the MC excitation.Separate power generation experiments in sub-synchronous and super-synchronous,experimental results demonstrate the effectiveness and feasibility of the system. Designed to produce a matrix converter prototype of a5KW, Prototype, including hardware part and software part:hardware part is composed of the main circuit, snubber circuit, drive circuit,detection circuit, the controller circuit of variable vtructure controller and digital signal processor.The software part includes the converter program and the DSP control algorithm.Through the prototype test, the experimental results verify the correctness and feasibility of the system design, provided the experimental basis for the matrix converter as soon as possible to enter the field of practical application.