Pdf matlab simulink of three phase sixpulse thyristorrectifier. Phase controlled rectifier 3phase supply matlab simulation. Simulation of three phase rectifier in simulink matlab in this tutorial, i will explain the working and implementation of a three phase rectifier. The second set of pulses pd is sent to the sixpulse bridge connected to the delta secondary winding of the converter transformer. These control a twelvepulse thyristor converter made of two threephase fullwave thyristor bridges also called graetz bridges. Index terms bridge converter, three phase multipulse rectifier circuit, low. A thyristor 12pulse generator block generates the gate signals for the two converters. Schematic of sixpulse, controlled bridge rectifier with commutating inductance fig. The effects on the rectifier behaviour of the inductive components of the load and of the ac line will be investigated. Modeling and simulation of 6pulse and 12pulse rectifiers. Br2 shows the waveforms of the six lineline voltages that are available from the threephase source. Singh2 1, 2 electrical and electronics department, manipal institute of technology, manipal, india abstract. If my understanding of the system ive devised is correct, i thought the output voltage would decrease as the firing angle increased. The thyristor 6pulse generator block implements a thyristor 6pulse waveform generator in singlepulsing mode.
Matlab simulink of three phase sixpulse thyristor rectifier converter. Two thyristor converters are connected to a wyedeltawye transformer on the input. 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. It is connected to a 300 km distributed parameter line through a 0. Input voltage is 400v pp, rms and output voltage is variable from 80v to 342v. The time domain model takes full account of system losses and supply impedance on circuit current and voltage waveforms, allowing for dc current ripple and the changing states of conduction of the converter devices. Create a new blank model and save it in the first hand so you can access it in future. Figure 4a shows the simulation results of r phase voltage and current. This surely justifies the higher cost of the 12pulse as compared to the 6pulse.
A 10 ohm load is fed in dc through a threephase rectifier from an inductive source 5 mh. The transformer has a turns ratio of 14, stepping the supply down to 8. A 12pulse rectifier uses two 6pulse rectifiers in parallel 12 diodes to feed a common dc bus. Design of dc output voltage inside onetime period of the ac source 6pulse, 12 pulse. Choose a web site to get translated content where available and see local events and offers. Generate pulses for twelvepulse and sixpulse thyristor. The figure shows the equivalent circuit for the thyristor 6pulse generator. Simulation and design of three phase rectifier in simulink. Single phase half wave controlled rectifier with r load fig 19. Design and simulation of three phase controlled rectifier. The source of the rectifiers is a rectified three phase input current, which is having six pulse ripples. The pulse generator thyristor block generates two pulse trains. Im trying to model a 6 pulse rectifier in matlab simulink but coming across some errors in the output voltage when the firing angle into the pulse generator exceeds 90 degrees. These control a twelve pulse thyristor converter made of two threephase fullwave thyristor bridges also called graetz bridges.
The rectified current is filtered by a 200mh inductance. Learn more about rectifier, rectifiers, ac, dc, conversion, simulink, thyristor, 6 pulse, pulse generator, firing angle. Pdf matlab simulink of three phase sixpulse thyristor rectifier. Voltage notch and harmonic caused by 6pulse three phase. Open matlab and then open simulink using the simulink icon on matlab as we have been doing in previous tutorials. Based on your location, we recommend that you select. Simulation of threephase bridge rectifier using matlab. In a large number of power electronics applications, including ac motor variable speed derives, static frequency converters, dc servo drives and so on, the ac power supply, in the form of the 50 or 60 hz sine wave.
Lab manual power electronics ee460 page 5 of 80 lab 1. Notably, it is a referred, highly indexed, online international journal with high impact factor. The direct voltage is higher than that from the half. Know the operation of a singlephase diode rectifier with resistive and inductive loads and their performance parameters. Measuring the synchronization angle of the ac signal with a phaselocked loop. Disregarding commutation overlap, each valve only conducts during 60 per period.
Structure of the singlephase, doubleway, fullwave bridge rectifier. Waveforms of three phase sixpulse diode bridge rectifier with r load i. The same three phase voltages are connected at the input of both rectifiers. Pdf matlab simulink of three phase sixpulse thyristorrectifier converter. What is a pulse rectifier and what kinds are there. If this cut off frequency is much lower than the ripple frequency i. Modeling of sixpulse rectifier operating under unbalanced. However, as shown in figure 2, the first rectifier is fed from a y. Disadvantages of a 12pulse rectifier are costdue to the special.
Three phase sixpulse diode bridge rectifier with r load fig 17. Simulink model, ideal voltage source, 6pulse thyristor, sawtooth function, matlab. For instance, the routine 12pulse diode rectifier consolidates two sixpulse diode connects through phase shifting. The figure shows the equivalent circuit for the rectifier as a fullwave, sixpulse rectifier. A dynamic modeling of thyristor rectifier which is useful for the study of power electronics controlled rectifiers with the help. Simulation of voltage notches and harmonic caused by 6pulse three phase rectifier. In particle accelerators, rectifiers are used to convert the ac voltage into dc.
The 6pulse and 12pulse rectifier can regularly found in adjustable speed drives. Dynamic modeling of six pulse rectifier using matlab vikas m1, b. Diodes are connected in parallel with rc snubbers ohms0. Modeling of the sixpulse rectifier bridge circuit, operating under practical operating conditions, when connected to an unbalanced threephase supply is presented in this paper. There are six waveforms because polarity must be considered. Simulation of threephase bridge rectifier using matlab simulink for harmonic mitigation. Type simulink on matlab command window selecting new file file new model selecting source libraries simpowersystems electrical sources selecting thyristor. The 12pulse topology is known to be more expensive, but produce the.
The new block features a mechanism that eliminates duplicate continuous and discrete versions of the same block by basing the block configuration on the simulation mode. As can be seen from figure 6, the 12pulse rectifier clearly outperforms the 6pulse in all four case examples. This paper discusses the impact of using 6pulse and 12pulse rectifier circuit commonly found in adjustable speed drives. International journal of science and research ijsr is published as a monthly journal with 12 issues per year. International journal of modern engineering research ijmer. Based on the synchronization angle, theta, and the firing angle, alpha, the block internally generates six ramps, one for each of the pulse elements in its output vector. You can use this block to perform phasecontrolled actodc conversion by. This is an improved version of the synchronized 6pulse generator block. The averagevalue rectifier three phase block does not yield the harmonics that are typically associated with the detailed representation, however, because it performs an averagevalue power conversion. Modeling and simulation of 6pulse and 12pulse rectifiers under balanced and unbalanced conditions with impacts to input current harmonics. Matlab simulink model of two 6pulse acdc converter with current injection. This example shows an ideal ac transformer plus fullwave bridge rectifier.
Generate thyristor 6pulse waveform in singlepulsing mode. Three phase two 6pulse acdc converter with current injection and line side transformer 173 current having frequency about six times of the supply frequency between the filter and the rectifier currents. Modeling of sixpulse rectifier operating under unbalanced supply conditions article pdf available in journal of engineering and applied sciences 4 january 2009 with 681 reads. The use of passive filters to reduce the harmonic content ripple of the. The thyristor 12pulse generator outputs six pulses for a delta gate driver and six pulses for a wye gate driver. The converter transformer and the rectifier are modelled respectively with the universal transformer and universal bridge blocks the converter is a 6 pulse rectifier. Pdf modeling of sixpulse rectifier operating under. Generate pulses for twelvepulse and sixpulse thyristor converters.
Now, click on the library browser icon on simulink recently created model. In steadystate condition, each pulse train consists of six equidistant square pulses with 60 degrees shift between them. For information on the control model, see the thyristor 6pulse generator block. A transformer with one primary and two secondary windings creates a 30 degree phase shift between the two current waveforms, which eliminates the 5 th and 7 th harmonics and reduces current thd to between 10 and 15 percent. Dynamic modeling of six pulse rectifier using matlab.
498 28 920 1239 1126 121 383 914 500 1007 1471 1339 1119 1517 111 22 1486 1613 1399 713 44 1573 1091 1299 1226 255 1161 217 1434 426 974 830 352 1163 1334 614 899 1279 696 1239 419 888 692 527 176 1322