The Study Of Singal PWM Rectifier Based On DSP Control Technology

In the electrical power system, The voltage and the electric current should be complete sine waves. But in the actual electrical power system. As a result of misalignment load influence, the actual network voltage and the current waveform always have the varying degree distortion which bring many questions for the electric power distribution system and the neighbor other electrical equipment. Therefore has the necessity to take the measure to. limit it to the electrical network and other equipment's influence.The high power factor electrical energy transformation and load electrical energy back coupling electrical network's realization is key question of the electric power energy conservation.. In order to cause the voltage PWM rectifier net side to present the current supply characteristic, Its net side current control appears very important. In PWM rectification technological development process, The voltage PWM rectifier net side current control strategy mainly divides into two kinds: One kind is "the indirect current control" strategy, Another kind is "the direct current control" strategy which occupies the main status at present. "the direct current control" is opposite in "the indirect current control" has the fast electric current effect and the good robustness. This article uses the fixed turn-on frequency triangular wave comparison direct current control method.This article has carried on the analysis to the single-phase PWM rectifier and Inferred the corresponding mathematical model and the control structure diagram. In view of the difficulty of single-phase PWM rectifier modelling and the difficulty of the electric current and voltage control link's PI regulator designs, proposing one kind of single-phase PWM rectifier's PI regulator's design method which based on the classical linear control to the misalignment linearized and the input output energy conservation unifies. To the electric current, the voltage control link's regulator has carried on the shaping and the parameter design separately and has carried on the design confirmation to the advanced version PR regulator. In order to suppress the system output DC voltage depreciation and eliminate the voltage harmonics, voltage compensation control based on the system mathematical model used to carried on effective suppression and obtain stably, and few harmonic content output DC voltage.This article has carried on the choice to the single-phase PWM rectifier's topology, to system main circuit, IGBT rectification bridge's driving circuit, DC voltage, alternating current and network voltage synchronized signal sampling circuit, the DSP control circuit and as well as software design. And confirmed the system through the simulation to be able very good to realize the high power factor electrical energy transformation and the electrical energy two-way flow. Carries on part experimental verification PWM pulse control rationality and accuracy, having certain theory value and the application value.