The currents in the secondary windings present a dc component, but the magnetic flux is compensated by the double star. Network harmonics analysis installation with 6pulse. The nonlinear load is a threephase diode rectifier. Important applications for linecommutated threephase controlled rectifiers are found in machine drives. A basic tutorial on computer simulation of phase controlled rectifiers using psim. Single phase half wave controlled rectifier with r load fig 19.
The use of passive filters to reduce the harmonic content ripple of the. Psim model of three phase six pulse diode bridge rectifier with r load fig 21. As can be observed, only one valve is fired at a time, and then this connection in no way corresponds to a parallel connection. For very large installations it is quite common to have a combination of a 12 pulse rectifier with extra input filtering, to dramatically reduce harmonics. Thd mitigation in line currents of 6pulse diode bridge. The difference in the thd of line current can be as much as. Schematic of sixpulse, controlled bridge rectifier with commutating inductance fig. Three phase six pulse diode bridge rectifier with r load fig 17. Sixpulse diode rectifiers work fine when you want a fixed dc voltage. Jeraldine viji associate professor, eee department, mailam engineering college, tamil nadu. In this converter, the number of pulses is twice that of phases, that is p 2m. Wartsila jovyrec thyridin 6 pulse 12 pulse thyristor rectifier. As an example the 6 pulse controlled rectifier model is.
Below are descriptions of selected examples in psim there are more examples than listed below, located in the examples subfolder of the psim installation directory. Special attention has been given to the methods for reducing harmonics with ac drives. Based on the psim software to build the circuit, this paper analyzed the working condition of the rectifier circuit under various common fire angles by taking the twelvepulse rectifier circuit as. A simple 6step or 6pulse voltagesource inverter 7, 8. It uses the time function to improve the physical and chemical properties of the plating coating film by changing the pulse parameters, to achieve savings in precious metals and obtain a functional electroplating coating film purposes. As an example the 6 pulse controlled rectifier model is shown. Generate pulses for twelvepulse and sixpulse thyristor. The case study of simulation of power converter circuits using. Passive input filters added to 6 pulse designs are usually cost effective and improve the input power factor, but often only effective at higher load levels of the load, typically above 50%. Whereas in 6 pulse rectifiers, we use 6 diodes or 6 scrs, all to be used for controlling purpose same as full wave rectifier. Oil and water cooled, present rating 110 ka and below per each 6 pulse, up to 2500 vdc. Torque and speed are controlled through the armature current i d and excitation current i exc. A brief summary of the advantages and disadvantages of. This isnt useful in a dc drive, but works fine for ac variable frequency drive vfd.
The following exercises require psim professional because they have a circuit with more than 60 elements. Thyristor voltage regulator with different fireing angle. A zener diode in psim is modelled by a circuit as shown below. This paper provides a case study of power electronics circuits in psim software. Modeling and simulation of 6pulse and 12pulse rectifiers. A 6pulse rectifier is the most robust and cost effective solution in the vfd industry as of today, even though input current contains some.
Psim europe website will not be updated anymore powersys is the exclusive distributor of psim software for europe, africa, and israel powersys us subsidiary is also an authorized rep of psim in the united states. The case study of simulation of power converter circuits. 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. Pulse rectifier plating is a powerful tool to control metal outer tank electrodeposition. A number of prebuilt examples are provided together with psim. Different models have been developed for this circuit operating under balanced 1 6 or unbalanced 79 supply conditions. It allows fast simulation and it has a friendly user interface. Involvement of software in teaching is provide a batter support, more clear and visual operation of complex circuits and waveforms to the faculty of power electronics in classroom teaching. Three phase fully contolled bridge rectifier file exchange. Multi pulse converters are converters providing more than six pulses of dc voltage per cycle or the converter is having more steps in ac input current than that of six pulse rectifier supply current.
One diode from each group is conducting at all times. The software packages available for simulation of power electronic circuits are matlab, pspice and psim and many more. E house power supply for high power rectifiers multipulse systems are available. Jul 23, 2012 three phase fully contolled bridge rectifier 6 thyristors change the firing angle using 6 pulse generator. The operation modes and main waveforms are shown for a firing angle of 60. The pulse generator thyristor block is controlled by the alpha angle reference signal and by the synchronization signal wt. A basic tutorial on computer simulation of phase controlled. As can be seen from figure 6, the 12 pulse rectifier clearly outperforms the 6 pulse in all four case examples. The figure below shows a sixpulse bridge controlled converter connected to a threephase source. A simple 6step or 6 pulse voltagesource inverter 7, 8 posted on october, 01 in power conversion of renewable energy systems a major concern is the provision of threephase power at variable induced voltage e and frequency f to supply induction and synchronouspermanent magnet motors maintaining the ratio.
Thus, the 3 pulse converter acts as an inverter and a rectifier. Different power electronics converters model are prepared on psim software and. Comparison of these waveforms with those pertaining to resistive load in fig. Solved full bridge phase shift psim simulation problem. Br2 shows the waveforms of the six lineline voltages that are available from the threephase source. Resultant thd for both the cases will be calculated and waveforms for line currents will be obtained.
Six step voltage source inverter part iii psim simulation. Six step voltage source inverter part iii psim simulation youtube. The difference in the thd of line current can be as much as 17%. For example, x1 and x5 fire together whenever the voltage va vb is greater than any other linetoline voltage. Twelvepulse rectifier circuit based on the psim simulation software. Likewise, for 18 pulse, three 6 pulse rectifiers, and for 24 pulse, four 6 pulse.
A 12pulse rectifier is formed by combing two 6pulse rectifiers fed from two 3phase systems dislodged by 30 the 24pulse rectifier topology is gotten by combining two 12pulse rectifier systems which mean combining of four 6pulse rectifiers fed from four 3phase systems relocated by both 30. Sep 22, 2014 this video lecture contains psim simulation that was done for the six step inverter and you may get some ideas for gate pulse supplying procedure as well as the switching techniques that is. Standard industrial drives both ac and dc use six rectifier devices to form a threephase fullwave bridge. Use of the software in classroom teaching is provide an additional support to the faculty and its better then the time consuming black board practice. Wartsila jovyatlas supplies thyristor rectifiers for diverse requirements and applications. This paper will discuss the simulation of phase controlled converters which include single phase uncontrolled, semi controlled and fully controlled rectifiers with r,rl load and rl load with freewheeling diode, three phase uncontrolled, fully. The 3phase, 6pulse, full bridge diode rectifier is commonly used circuit. User manual 5sya 211001 semis simulation tool for 6 pulse. This video shows the operation of the 6 phase threephase rectifier controlled with resistive load. Onequadrant chopper circuit with current feedback, with the power circuit implemented in psim and the control implemented in simulink. Waveforms of three phase six pulse diode bridge rectifier with r load i. The figure below shows a six pulse bridge controlled converter connected to a threephase source.
This surely justifies the higher cost of the 12pulse as compared to the 6pulse. There are six waveforms because polarity must be considered. The ac currents of the sixpulse rectifier are shown in fig. Different models have been developed for this circuit operating under balanced 16 or unbalanced 79 supply conditions. This video lecture contains psim simulation that was done for the six step inverter and you may get some ideas for gate pulse supplying. Aug 15, 2018 this video shows the operation of the 6phase threephase rectifier controlled with resistive load. Multimeter1 is used for measuring voltages across all the 6 thyristors. Twelvepulse rectifier circuit based on the psim simulation. A 6pulse rectifier is the most robust and cost effective solution in the vfd industry as of today, even though input current contains some amount of low order harmonics. The software packages available to simulate power electronic circuits are matlab, pspice and psim.
As home assigment we have to design thyristor voltage regulator in simulink. Psim is a simulation package specifically designed for power electronics and control circuits. It should run for 5 periods with different thyristor fireing angle for each period 30, 60, 90, 120, 150. Three phase active shunt power filter with simple control. Power factor, shape distortion and voltage can be increased as much as seen through two types of this topology if it is connected to the nonlinear loads in power systems. The common cathode group consists of x1, x2, and x3, and the common anode group consists of x4, x5, and x6. The effects on the rectifier behaviour of the inductive components of the load and of the ac line will be investigated. In order to trigger thyristors we have to give proper triggering pulses to it using a pulse generator. We can enter values in the box which is obtained by double clicking pulse generator. As can be seen from figure 6, the 12pulse rectifier clearly outperforms the 6pulse in all four case examples. The diagram in figure 1 represents a simplified network comprising a 2,000 kva six pulse rectifier, injecting a harmonic current spectrum, and the following equipment which will be considered consecutively in three different calculations. In this paper multipulse converter with 6, 12, 18, 24 and 36 pulse rectifier are designed using different topologies of three. To achieve 12 pulse rectifier two 6 pulse rectifiers are used in parallel. Thyristor voltage regulator with different fireing angle for.
The rectifier has six diodes arranged in two groups. Twelve pulse rectifiers can improve upon more standard 6 pulse systems and offer the ability to correct the problem across the whole load range. Based on the psim software to build the circuit, this paper analyzed the working condition of the rectifier circuit under various common fire angles by taking the twelve pulse rectifier circuit as. This video shows the operation of the 6phase threephase rectifier controlled with resistive load. Three phase fully contolled bridge rectifier 6 thyristors change the firing angle using 6pulse generator. Br1 shows the schematic of a six pulse, controlled bridge rectifier connected to an ideal threephase source with commutating inductances included in each phase. Psim model of three phase sixpulse diode bridge rectifier with r load. Designing and harmonic analysis of a new 24pulse rectifier. Thus, the 3pulse converter acts as an inverter and a rectifier.
When a controlled voltage is needed, a thyristorfired phasecontrolled rectifier may be preferred. Different power electronics converters model are prepared on psim software. Scalar control all pages have more than 60 elements except page 4 and 5. Nov 09, 2014 the simplest converter is a fullwave diode bridge, which converts the incoming ac to a fixed dc voltage.
The earliest analysis 1 presents an investigation onto the performance characteristics of mercuryarc rectifier allowing for the. This video lecture contains psim simulation that was done for the six step inverter and you may get some ideas for gate pulse supplying procedure as well as the switching techniques that is. The rectifiers can be configured as 12, 18, and 24 pulse rectifiers powered by a transformer with a number of secondary windings. My problem is that i have a very large voltage drop after the zvs inductor and my square wave shape changes after this inductor. First of all im really low with ee so please, go easy on me. In each graph, the top waveform is the utility voltage and the bottom waveform is the input current of the ssfc.
Whether it is a matter of high environmental temperatures or shock and vibration, we can adapt to your specific requirements. Well start by first considering the operation of an uncontrolled rectifier without commutating inductances. High power transformer rectifier systems 6 pulse, up to 2500 vdc. The three graphs below are taken from a 6 pulse rectifier, 12 pulse rectifier and igbt rectifier at full load figure 8 to 10. Using the same converter configuration, it is possible to combine two bridges of. This surely justifies the higher cost of the 12 pulse as compared to the 6 pulse. Use of the software in classroom teaching is provide an additional. Psim is indicated for systemlevel simulation, control loop design and motor drive system studies. But the 24pulse system consists of nine wound components, 24 diodes and a high components count, which were. Six pulse diode rectifiers summer 2002 spectrum software. The diagram in figure 1 represents a simplified network comprising a 2,000 kva sixpulse rectifier, injecting a harmonic current spectrum, and the following equipment which will be considered consecutively in three different calculations.
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