Note that Simulink selected the FixedStepDiscrete solver to simulate the model.Ĭompare waveforms with those obtained with the continuous integration algorithm. Note that the Simulation type parameter of the Powergui is automatically changed to Discrete, with a sample time of 50e-6 usec. Open the Configuration parameters of the model and select the Fixed-step auto (Automatic solver selection) solver. The voltage magnitude is the sum of the specified forward voltage (0.8 V) and the voltage developed across the diode resistance (0.01 ohm). Zoom on the Diode3 voltage (trace 4) during the conduction period. The 3.3 degrees overlap is clearly seen on trace 3 of the scope showing currents in diodes 2 and 3. Note that most of the third harmonic which can be seen in the rectified voltage Vd (mean value 127 V) is filtered out by the smoothing reactor.Īlso observe the commutation period due to the source inductances. Note that Simulink® selected the Ode23tb solver to simulate the model.Īfter a transient period, the load current Id stabilizes at 12.7 A. Start the simulation and observe waveforms on the four-trace Scope block. the below one is a part of slip power recovery scheme: I have made a 3 phase bridge rectifier to convert 3 phase input voltage to a dc.the output of the rectifier is then connected to 3 phase inverter along with 3 phase filter.I am not able to design a filter to get voltage output of 50 hz with total harmonic distortion less than 5 at the three phases. After that proper implementation of three phase rectifiers on MATLAB’s simulink is explained along with the working of each step and purpose of each block used and parameters settings of each block. At the start a brief and concise introduction of rectifiers and three phase rectifiers is provided along with its types. Note that the Simulation type parameter of the Powergui block is not accessible, and it is set to Continuous. As we have implemented a single phase rectifier in previous tutorials it will be really easy for you to understand the working of a three phase rectifier. The Variable-step auto (Automatic solver selection) solver is selected. Simulation with continuous integration methodĬheck the simulation parameters in the Simulation -> Configuration Parameters menu. The rectified current is filtered by a 200mH inductance.ĭiodes are connected in parallel with RC snubbers (1000 ohms-0.1 uF) The measurement output of Diode2 and Diode3 is used to observe the diode voltage and current. A 10 ohm load is fed in DC through a three-phase rectifier from an inductive source (5 mH 120 V rms).
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