Abstract. In the paper, the possibilities of application of switched reluctance generators in modern variable-speed drives were discussed. The process of mechanical energy conversion into electric energy was discussed. Based on simulation and laboratory tests, output power profiles, efficiency profiles and profiles of ratio of output power to phase current were determined in the single-pulse mode. The authors showed that proper selection of control parameters allows the operation of the SRG with maximum power, maximum efficiency or maximum ratio of output power to phase current. Finally, conclusions concerning advantages of using SRGs in variable-speed applications were drawn.
The paper presents results of simulation studies of four-phase 8/6 Switched Reluctance Machine working in steady-state. Simulation model of the machine was developed in Matlab/Simulink based on mathematical model. Simulation model was realized based on SimPowerSystems library, which contains for example models of semiconductor elements or power supplies. Controllable current sources and voltage measurement blocks were also used. Mathematical description of the machine is difficult to obtain in nonlinear circuit simulation models. Nonlinear flux characteristics ψ(θ, i) were obtained by field calculations and then were tabulated and used in circuit model of the machine. Studies were concerned the change of working point influence of motor on basic parameters especially on electromagnetic torque with various basic control methods (current control: soft-chopping and hard-chopping, voltage control: soft and hard, and one-pulse control). In current control was only used hysteresis regulator which held phase current at a certain level. Current control is possible to base speed, voltage control with its particular case called single-pulse control has wider use because it can be used above base speed, but for high-speed operation single-pulse control is used.
MODEL SYMULACYJNY MASZYNY RELUKTANCYJNEJ PRZEŁĄCZALNEJW artykule przedstawiono statyczny model symulacyjny czteropasmowej maszyny reluktancyjnej przełączalnej SRM 8/6 (ang. Switched Reluctance Machine) w systemie Matlab/Simulink, z uwzględnieniem zjawiska nieliniowości obwodu magnetycznego. Na podstawie opracowanego modelu przeprowadzono badania symulacyjne dla róŜnych punktów pracy silnika przy sterowaniu jednopulsowym. Dokonano analizy wpływu zmiany punktu pracy silnika na przebieg momentu elektromagnetycznego.
The paper presents an FPGA-based output voltage control system of a fourphase switched reluctance generator above base speed. The presented control strategy uses a digital PI controller to vary turn-off angle at fixed turn-on angle under single-pulse mode. Simulation tests were conducted based on the simulation model built in the Matlab/Simulink environment. The results of the simulation and laboratory tests as waveforms of voltages and currents are presented. Based on the presented control system, the dependencies of overall efficiency in the function of turn-on angle and ratio of output power to rms phase current (P out av /I ph rms ) in the function of turn-on angle were determined. They allow for the selection of a proper value of turn-on angle for the optimal performance of the generator during the output voltage control. The results obtained from laboratory and simulation tests are discussed in the conclusions.
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