MODELING AND SIMULATION USING MATLAB SIMULINK SHAILENDRA JAIN PDF
Dr. Shailendra Kumar Jain is a Professor in Department of Electrical Engineering. Table of Contents. Preface. 1 Simulation Mechanism and Simulation Tools. Modeling and Simulation using Matlab Simulink eBook: Dr. Shailendra Jain: ppti.info: Kindle Store. Modeling and Simulation using Matlab Simulink - Kindle edition by Dr. Shailendra Jain. Download it once and read it on your Kindle device, PC, phones or.
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Figure 1: Short circuit alternator with the connected system. While rotation, shaft of a high speed large machine is normally charged with certain amount of voltage with respect to earth.
International Journal of Advanced Computer Research
This unwanted voltage is known as shaft voltage. It is a very old and common phenomenon in any electrical machine. Shaft voltage was noticed in the beginning of the 20th century by the engineers while studying different motor failure cases.
Shaft voltage in those days was based only on sinusoidal power sources. It was noticed mainly due to unbalance in magnetic fluxes because of various reasons. Application of nonsinusoidal or static sources came into practice many years after the invention of semiconductor devices. With this some new types of shaft voltages appeared [ 9 ]. It is proven that shaft voltage under static power source is more predominant due to electrostatic phenomenon rather than pure sine wave operation [ 10 ].
Static excitation system has also added a new type of shaft voltage on the basic shaft voltages [ 11 ]. Bearing currents are the outcome of presence of shaft voltages.
There are three major types of bearing currents: circulating current, current, and discharge current [ 12 — 14 ]. Each of these currents flows under different conditions.
Other than the mechanical reasons, majority of the premature bearing failures are due to the flow of these bearing currents. Common mode voltage CMV [ 15 ] is also responsible to flow current through machine bearings to ground. Many authors [ 16 — 18 ] presented different inverters topologies to eliminate CMV.
Various filtering techniques e. Most of the shaft voltage and bearing current problems and solutions related to work were carried out on induction motor [ 22 , 23 ].
This paper creates a different approach by taking a high power short circuit alternator for the study. SES has great operation flexibilities compared to the other methods of excitation. It is also cheaper than the old conventional motor-generator set.
Fast response characteristic, easy monitoring control, and troubleshooting are some other advantages of SES. In spite of several benefits, generation of shaft voltage is the major concern among the machines with static sources.
The shaft voltage problem in the short circuit alternator has already been reported earlier [ 24 — 26 ].
This paper begins with the description of SES. Waveforms at various key points are recorded with the high speed recorder and stored for further analysis. A Simulink model has been prepared with the help of different parameters from converter bridge. The model is run and the results are compared with the actual waveforms recorded from the system.
A discussion on the shaft voltage is brought out with these results. Excitation level in a machine is needed to vary according to the different modes of the machine. This is only possible with a phase controlled rectifier. Now, to improve the power factor and to reduce the harmonic level of the system, a poly-pulse AC-DC power conversion [ 27 ] is required.
To maintain this theory a pulse converter configuration is adopted for SES in short circuit alternator. It is formed by a series combination of two 6-pulse thyristor based silicon-controlled rectifier SCR. Rotor current is very high value in alternator mode. To cope with this current two thyristors are put in parallel in each leg of the bridge. Detailed drawing is depicted in Figure 2. Figure 2: Circuit diagram of static excitation system. The circuit begins with a specially designed converter transformer at the bridge input.
It is a step down transformer with one primary and two secondary windings.
Rectified six-pulse outputs of each converter bridge are connected in series to form a pulse output. This current is controlled by changing the thyristor gate pulses from the control cubicle.
A dc circuit breaker does the switching action between SES and rotor circuit. SES panel is divided into two main parts see Figure 3. One is power cubicle, consisting of thyristors and snubber circuits. The second part is the CPU with other electronic control circuitry and feedback loops. Figure 3: Static excitation system for MVA short circuit alternator. Figure 4 depicts the star and delta input voltages of the converter bridge.
Simulink model analysis writing
Converter output applied on the alternator field winding and current flowing through it are shown in Figure 5. This is for a 3 kV alternator output see Figure 6. Figure 4: Converter input voltages from transformer top: star winding Vrms, bottom: delta winding Vrms.
Figure 5: Rotor supply for a 3 kV stator output top: field voltage 30 V, bottom: field current A. Figure 6: Generator output 3 kVrms, 50 Hz. It has already been mentioned that SES is a combination of two thyristor bridges in series connection.
The same has been modelled in Simulink [ 29 ] platform see Figure 7 with one supply source, input transformer, two thyristor converters, pulse generators, and other circuitries. The model is formed with the variables listed in Table 1. All these parameters are taken from the actual converter.
Table 1: SES model parameter values. Figure 7: Simulink model of SES. Simulation Results and Discussion on Shaft Voltage After running simulation the scope window displays different waveforms see Figure 8.
The simulated traces and actual waveforms from the measurements points of SES are compared which show similarities. Rotor voltage and current are pulsating in nature. It contains numbers of low and high order harmonics. This is confirmed by Fourier transform. Similarly FFT for rotor current waveforms are depicted in Figures 12 and I recently did projects on Simulink related to modeling of quarter vehicle suspension system to find response of suspension system to bump More.
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Set your budget and timeframe. Outline your proposal. Basavaraja, D. Harsha Vardhan Reddy, V. Aware, Dr. Tarnekar, Jagdish G. Yuvarajan, Bellamkonda Ram swami, And V. Ieci No. Chhaya and Bimal K. Klima, M. IEEE Int.
Semiconductor Power Conversion Conf. Holmes and T.Presence of harmonics and other high frequency signals causes the capacitive and inductive couplings in the complete alternator system. Therefore, it is appropriate to transform the rotor position angle coming When the motor has equal rotor and stator pole arcs, from the mechanical equation so that it is modulo Figure 8: Scope view of simulation run a star voltage, b delta voltage, c gate pulses, d dc voltage, and e dc current and ref.
Related Papers. Username Valid username. View at Scopus S. The advent of low-cost computer power and the availability of numerical software tools provide the opportunity to fundamentally reorient the in-depth understanding of theoretical concepts of electrical and electronics engineering in an interesting and attractive manner, through computer simulation.
Perform Sumpners test on two 1-phase transformer and determine its efficiency at various load. Sparking on the grounding brushes is the evidence of presence of shaft voltages.
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