The control process is based on a novel decoupled current control strategy using both the direct and quadrature current components of the statcom. The svpwm generator 2level block generates pulses for threephase two level dcac converters using the spacevector pulse width modulation svpwm. Svpwm generator 2level mathworks makers of matlab and. International open access journal of modern engineering research ijmer ijmer issn. Acdc converter, zigzag autotransformer, power quality, 24 pulse rectifier, direct torque. This is a simple system implementing bpsk modulation. The following parametres settings produces outputs a pulse shown in screenshot. Oversampling, adc dac conversion,pulse shaping and matched. A two level vsc is used to realize a 24 pulse converter with minimum switching loss by operating it at fundamental frequency switching ffs.
In a 12 pulse rectifier 3phase supply is given two delta to star and delta transformer connected to two 3 phase bridges converting 3 phase ac to dc. Pdf modeling, design and analysis of multi pulse converter. In this matlab tutorial for beginners i will show you how to easily make 3 phase voltage source inverter. Rectangular pulse function matlab rectangularpulse. In this paper the simulation and hardware of closed loop control of 24pulse converter is presented. Using the same converter configuration, it is possible to combine two bridges of the sixpulse to obtain a twelve or more pulses converter.
Also, the inductance current is modelled by an integrator block that. 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. The simulation of 12 pulses, 18 pulses, 24 pulses and 48 pulses mpc is performed on matlab simulink. Again, attempting to drag a line from the converter to the trianglemarked port on the constant current source results only in a dashed red line. In this converter, the number of pulses is twice that of phases, that is p 2m. The bridge is fed by a threephase voltage source 200 v peak linetoground or 245 v rms linetoline and it is connected to a resistive load. It involves pulse multiplication in a 12pulse acdc converter. Novel reactive power controllers for the statcom and sssc.
The proposed 24pulse acdc converter fed vcimd topology c. The converter switches are represented by the following equivalent circuit. Experimental results are provided to enhance the performance of dspace controller. In the example, p 12, so that injected harmonics on the ac. Pdf analog control of closed loop 24 pulse rectifier.
Pdf analysis of 12 pulse phase control acdc converter. An alternative proposal for hvdc transmission systems using. Boost converter simulation using simulink matlab dcdc. The figure below shows a sixpulse bridge controlled converter connected to a threephase source. A 24pulse acdc converter employing a pulse doubling technique for vectorcontrolled induction motor drives. An alternative proposal for hvdc transmission systems. Generate pulses for twelvepulse and sixpulse thyristor. Performance analysis of pulse analog control schemes for. The synchronized 12 pulse generator block generates two vectors of six pulses synchronized on the twelve thyristor commutation voltages. Generate pulse for pwmcontrolled dcdc converter simulink. The ripple factor and form factor are calculated for all the above mentioned multi pulse. Oct 29, 2014 a 24pulse acdc converter employing a pulse doubling technique for vectorcontrolled induction motor drives. Pulse width modulation is a technique that use as a way to decrease total harmonic distortion in inverter circuit. Oversampling, adc dac conversion,pulse shaping and.
The new block features a mechanism that eliminates duplicate continuous and discrete versions of the same block by basing the block configuration on the. The model is based on dividing each cycle of the 60 hzsystem into twelve intervals out of which six intervals are commutation intervals with three valves conducting. Using the same converter configuration, it is possible to combine two bridges of the six pulse to obtain a twelve or more pulses converter. Jul 10, 2016 this paper deals with the performance analysis of a twolevel, 24 pulse voltage source converters vscs for high voltage dc hvdc system for power quality improvement. A set of twolevel 6 pulse voltage source converters vscs is used to form a 48 pulse converter operated at fundamental frequency switching ffs. A zigzagconnected autotransformerbased 24pulse acdc converter is. Also, the inductance current is modeled by an integrator block that. You can set the period of each cycle by specifying the timer period tper. With the designed values of llc resonant dcdc converter, the closed loop configuration with pulse analog control schemes like ppm and pwm are designed and presented with psim 6. The basic building block of the statcom is the full 48pulse convertercascade implemented using the matlabsimulink software. Simulink model of a openloop boost converter is shown in figure 9a. If you use a fixedstep solver and the pulse type is time based, choose the step size such that the period, phase delay, and pulse width in seconds are integer multiples of the solver step size. Keywords24pulse, acdc converter, power quality, tyristor bridge, pulse multiplication, polygon autotransformer. Generate pulses for svpwmcontrolled twolevel converter.
The inverter described in this example is a harmonic neutralized, 48 pulse gto converter described in reference. 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. Run the simulation and open the fft analysis tool of the powergui block to see the harmonics and the thd value of the voltages produced by the two converters. A two level vsc is used to realize a 24pulse converter with minimum switching loss by operating it at fundamental frequency switching ffs. Mathworks is the leading developer of mathematical computing software for engineers and. The tap values for the zigzag connection in the primary windings in the transformers were calculated in section 3, considering the transformation. Working principle the pwm generator block outputs either 1 when the duty cycle is greater than the carrier counter value, or 0 otherwise. The proposed acdc converter is able to eliminate up to 21st harmonics in the supply current. The pulse generator thyristor block is controlled by the alpha angle reference signal and by the synchronization signal wt. Harmonic analysis of 6pulse and 12pulse converter models. Tips if a and b are variables or expressions with variables, rectangularpulse assumes that a apr 12, 2017 generating an isolated rectangular pulse in matlab.
Dspace1103 controller for pwm control of power electronic. Database datagridview bindingsource filter part 12 duration. The structure of the converter requires a current i l necessarily positive or zero. Dec 22, 2015 simulation of dc dc converter using matlab simulink. Lets consider a digital communication system shown below, where in, a train of input data in \\pm 1 \ are shaped by a pulse shaping filter and modulated by a carrier fc. A 24pulse rectifier has been designed for high voltage, low current. Dc converter using matlab simulink simulation of dcdc step up converter duration. In a 24 pulse rectifier 3phase supply is given two delta to star and delta transformer connected to two 3 phase bridges converting 3 phase ac to dc. This is an improved version of the synchronized 12pulse generator block. For example, suppose that the period is 4 seconds, the pulse width is 75% that is, 3 s, and the phase delay is 1 s. This project is focus on modeling and simulation of single phase inverter as a frequency changer modulated by sinusoidal pulse width modulation spwm. Please, dont write your email address in a public comment, it wont be approved. This is an improved version of the synchronized 6 pulse generator block.
It consists of four 3phase, 3level inverters and four phaseshifting transformers. The special phase shift transformers are designed to get required phase displacement. This is an improved version of the synchronized 12 pulse generator block. An inverter is a circuit that converts dc sources to ac sources. Analog control of closed loop 24 pulse rectifier simulation.
The effect of load variation on vcimd is also studied to demonstrate the effectiveness of the proposed acdc converter. This example generates a pulse train using the default rectangular pulse of unit width. Dinesh2 1mtech, power electronics, department of electrical and electronics engineering. Oct 04, 2014 harmonic analysis of 6pulse and 12pulse converter models 1. The order n of these characteristic harmonics is related to the pulse number p of the converter configuration.
We will use rectangular pulse shaping filter pt for implementation in matlab. It involves pulse multiplication in a 12 pulse acdc converter. The block can control switching devices fets, gtos, or igbts of three different converter types. The performance of the vsc system is improved in terms of reduced. Keywords 24 pulse, acdc converter, power quality, tyristor bridge, pulse multiplication, polygon autotransformer. Generate square wave pulses at regular intervals simulink. You can change the initial output, or phase, of the pwm output by specifying one of three types of carrier counters. To prove and validate the efficiency of the proposed converter system, two simulation models conventional 12pulse and proposed 24pulse hvdc system were simulated in matlabsimulink software. Moreover, dc ripple reinjection is used to double the rectification pulses resulting in an effective harmonic mitigation. Matlabsimulink software and power system block set. The pwm generator 2 level block generates pulses for carrierbased pulse width modulation pwm converters using twolevel topology. This paper deals with the performance analysis of a twolevel, 24pulse voltage source converters vscs for high voltage dc hvdc system for power quality improvement. Jul 16, 2002 pulse amplitude with respect to ground normal level normal level determines the base level of the signal and pulse amplitude with respect to ground defines the level of the signal with respect to ground when the pulse has arrived.
In both the control schemes, the two mosfets of half bridge inverter are gated by a square pulse with a dead time of 370 ns which is provided by dead. The ac dc converter supplies the consistent rl load r 50 ohm, l0. Matlab simulation of controlled fullwave rectifier. Most software that requires matlab can also be used with octave, a freely available opensource program that is compatible with matlab. The ripple factor and form factor are calculated for all. The block waveform parameters, amplitude, pulse width, period, and phase delay, determine the shape of the output waveform. Matlab combines a desktop environment tuned for iterative analysis and design processes with a programming language that expresses matrix and array mathematics directly. The pwm generator dc dc block outputs a pulse to fire the mosfet, gto, or igbt switch of a onequadrant converter buck or boost.
Single pulse generator file exchange matlab central. Some software requires matlab, a popular commercial program that provides an interactive environment for numeric computation and graphics using an interpreted programming language that optionally can be compiled. The two last steps are to obtain closedloop simulations 2. Harmonic analysis of 6pulse and 12pulse converter models 1. A novel isolated 36pulse acdc converter for line current harmonic. With this pattern, known as softwaredetermined, each pwm. Jun 17, 2019 lets consider a digital communication system shown below, where in, a train of input data in \\pm 1 \ are shaped by a pulse shaping filter and modulated by a carrier fc. Sine pulse width modulation spwm using simulink duration. Compute a rectangular pulse of width by using rectangularpulsex. The inverter described in this example is a harmonic neutralized, 48pulse gto converter described in reference. A 24pulse acdc converter with vector control technique 73450a24pulseacdcconverterwithvectorcontroltechnique, matlab central file exchange. Simulation of dc dc converter using matlab simulink. The wt signal is an angle varying between 0 and 2pi radians, synchronized on zero crossings of the fundamental positivesequence of phase a of the primary voltage of the converter transformer.
The converter transformer and the rectifier are modelled respectively with the universal transformer and universal bridge blocks the converter is a 6 pulse rectifier. The first set of pulses, denoted py, is sent to the six pulse bridge connected to the wye y secondary winding of the yydelta converter transformer. First, we have simulated the proposed scheme via matlabsimulink software. To prove and validate the efficiency of the proposed converter system, two simulation models conventional 12 pulse and proposed 24 pulse hvdc system were simulated in matlab simulink software. A new threelevel, 24pulse voltage source converter based hvdc system operating at fundamental frequency switching has been designed and its model has been developed and it is successfully tested for the independent control of active and reactive powers and acceptable level harmonic requirements.
A value between 0 and 1 determines the percentage of the pulse period that the output is on. Jul 10, 2016 this paper deals with an analysis, modeling and control of a two level 48 pulse voltage source converter for high voltage dc hvdc system. Perturb and observe mppt for solar pv with boost converter. Mar, 2020 a 24pulse acdc converter with vector control.
The rectangular pulse function is also called the rectangle function, boxcar function, pi function, or gate function. Tips if a and b are variables or expressions with variables, rectangularpulse assumes that a software developer. This is an improved version of the synchronized 6pulse generator block. In this paper the simulation and hardware of closed loop control of 24 pulse converter is presented. It includes the live editor for creating scripts that combine code, output, and formatted text in an executable notebook.
A 24pulse acdc converter employing a pulse doubling technique for vectorcontrolled induction motor drives 650 views. What is new in the release of 2018b matlab software how to install and download matlab r 2018a latest version with crack free 100% working matlab 2019 free download. A boost converter stepup converter is a dctodc power converter with. A twolevel, 48pulse voltage source converter for hvdc systems.
The converter transformer and the rectifier are modelled respectively with the universal transformer and universal bridge blocks the converter is a 6pulse rectifier. The pulse width modulation technique controls power transfer from one electrical component to another by quickly switching between full power transfer and no power transfer. Equation 14, and are modeled by addition blocks, multiplication blocks and logic blocks. The figure below shows a six pulse bridge controlled converter connected to a threephase source.
Mar 31, 2017 in this matlab tutorial for beginners i will show you how to easily make 3 phase voltage source inverter. Equation 12 is modelled by blocks addition, multiplication and logic. Dec 28, 2017 to get price details send me an email at. Simulink model of the openloop buck converter is shown in figure 6 a. A set of twolevel 6pulse voltage source converters vscs is used to form a 48pulse converter operated at fundamental frequency switching ffs. Generate pulse width modulated signal or waveform matlab. The simulation of 12 pulses, 18 pulses, 24 pulses and 48 pulses mpc is performed on matlab.
It is observed that input current total harmonic distortion thd of less than 8% is possible with the proposed topology of acdc converter at varying loads. It is connected to a 300 km distributed parameter line through a 0. Aug 21, 2016 im also in trouble on the input end, where i thought id need to drive the current source via a simulinktops converter which in turn takes its input from a step generator. Matlab simulation of controlled fullwave rectifier youtube. Pwm generator 2level makers of matlab and simulink. A laboratory prototype was designed and executed based on transformers with extended. Boost converter simulationmodelling using simulink matlab. The svpwm generator 2 level block generates pulses for threephase twolevel dcac converters using the spacevector pulse width modulation svpwm technique.
The pwm generator block outputs either 1 when the duty cycle is greater than the carrier counter value, or 0 otherwise. The pulse generator block generates square wave pulses at regular intervals. The inverter described in this example is a harmonic neutralized, 48pulse. Im also in trouble on the input end, where i thought id need to drive the current source via a simulinktops converter which in turn takes its input from a step generator. Analysis and design of threelevel, 24pulse double bridge. Nov 12, 2014 24 pulse rectifier consists of 24 diode, 3 phase supply. Simulation of power converters using matlabsimulink. A twolevel, 48pulse voltage source converter for hvdc. Generate pulses for svpwmcontrolled twolevel converter simulink. The duty cycle of the generator is specified by the input d. Simulation analysis was performed using matlabsimulink software in order to validate the proposed 24pulse converter for use in hvdc transmission systems, considering the operationality of the proposed system under normal and degraded operating conditions. This paper deals with an analysis, modeling and control of a two level 48pulse voltage source converter for high voltage dc hvdc system. The proposed 24pulse ac dc converter is found capable of suppressing up to the 21stharmonics in the supply current along with the powerfactor improvement close to unity in the wide operating range of the drive. A 24pulse acdc converter employing a pulse doubling.
1428 1238 618 361 356 964 978 1084 928 281 704 1202 593 1282 1140 426 1159 664 1222 779 1019 992 332 1190 922 1251 751 480 7 1013 1178 931 600 947 114 1236 156 737 1394 1341 663 979