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Comparative Study of PI and Fuzzy DC Voltage Control for a DPC- PWM Rectifier

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This paper treats control strategies of a pulse width modulation (PWM) rectifier to eliminate harmonics currents and consequently to reduce total harmonic distortion of the line current and improve power factor. It is about the use of direct control principle to control instantaneous active and reactive powers. Such a technique is called direct power control (DPC). The principal idea of DPC was suggested initially by Ohnishi (1991) and developed then by Noguchi and Takahachi in 1998. This concept is similar to DTC applied to induction motors. A comparative study, concerning the DC voltage control, will be given in this study. It is about the use of a PI controller and a fuzzy logic one to ensure a stable active power exchange. A digital simulation, in Matlab/Simulink/SimPowerSystems and Fuzzy Logic Toolbox, was carried out and given in the end of this paper. The simulation results show clearly the supremacy of the technique adopted to control the DC voltage. Streszczenie. Analizowano różne strategie przekształtnika PWM umożliwiające eliminację prądów harmonicznych a w konsekcencjio poprawę współczynnika THD. Zastosowano technikę SPC - direct power control. Wykorzystano kontrolery PI i logiki rozmytej. Metody oceniono przeprowadzając symulacje. (Analiza porównawcza sterownika napięcia DC w przekształtniku DPC-PWM) Keywords: PWM rectifier, direct power control, voltage estimation, instantaneous active and reactive powers, fuzzy control. Słowa kluczowe: przekształtnik PWM, DPC - direct power control Introduction Development in power electronics and the increase in power consumption as well as the flexibility in the use of semiconductors encouraged electro technologists to undertake significant associations of power static inverters to electric machines. Generally, these devices represent nonlinear loads, which absorb a no sinusoidal current and behave like harmonics generators. Moreover, they consume sometimes reactive energy. Consequentl[...]

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