Category: Electronics Abstracts

Enhancement of Voltage Quality in Isolated Power Systems Project explains about increasing voltage quality in power systems. Compensators are used for maintaing voltage variations and to control the distortions caused by voltage in the network.Voltage adjustment is one of the most used methods for controlling voltage variations. Simulators are used for validation on voltage levels. Voltage variations are mainly seen in rural and remote areas of the country. Mainly grid connections are used for solving this problem but in order to establish this system it requires more money.

When coming to power systems used in ships, oil explorations limited power is used for filling the needs. So in these systems motor drives and power converters are used. Even in these systems power systems are not accurate when comparing to grid.

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Stability In Power Systems is one of the most widely used secured system from past 80 years. Because of many issues caused from power blackouts, importance of this system had increased. In present situations usage of power systems interconnection had increased  use of new technologies and controls, and the increased its usage in highly demanding situations, different forms of system instability have emerged.

Though the usage of power systems is increasing there are few areas where voltage frequency stability is still a issue. So in order to maximize the system stability research on power system stability should be carried out. In order to design perfect system to solve this problem a detailed study on  design should be performed. Power stability means maintaining equalibrium on all parameters of power systems even when there is physical disturbances.

This paper will explain in detail about how this system is developed and requirements for this project.

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  Design, Modeling and Simulation of Fuzzy Controlled Svc for 750km (Λ/8) Transmission Line project is mainly concentrated on the importance of SVC in achieving continuous and automatic reactive power control using fuzzy logic controller. From the previously obtained values of voltage, currents and alpha values, fuzzy rules were set in order to obtain the desired firing angles of SVC so as to obtain a flat voltage profile in transmission network. The standard test system is simulated in MATLAB along with fuzzy logic controller. The results obtained were found to be proving trustworthy and can be implemented for the real time control of reactive power in any power system. 

Flexible AC transmission system (FACTS) is a technology, which is based on power electronic devices, used to enhance the existing transmission capabilities in order to make the transmission system flexible and independent operation. The FACTS technology is a promising technology to achieve complete deregulation of Power System i.e. Generation, Transmission and Distribution as complete individual units. The loading capability of transmission system can also be enhanced nearer to the thermal limits without affecting the stability. Complete close-loop smooth control of reactive power can be achieved using shunt connected FACTS devices. 

Intelligent FACTS devices make them adaptable and hence it is emerging in the present state of art.

The design, modeling and simulations are carried out for λ /8 Transmission line and the compensation is placed at the receiving end (load end).

            In ac power system, the generation and load must be balance at all times. To some extent, electrical system is self regulating. Beyond that when propped up with reactive power support load will go up, frequency keeps dropping and system will collapse. Alternatively, if there is inadequate reactive power, system can have voltage collapse. Thus reactive power control is an important control objective of any power system as its unbalance causes voltage variation at the load end. If the voltage variation is more than the   pre specified valve the performance of equipment suffers and life of most of equipment is sacrificed. Hence maintaining   voltage within reasonable limits is an important objective of power system control.

The conventional methods available for reactive power control are shunt capacitor, series capacitor, tap changing transformers and synchronous modifier. But these are operated by mechanical switches; hence do not offer fast and continuous control. 

FACTS controllers can enable alien to carry power closer to its thermal rating. According to IEEE terms FACTS means-alternating current transmission system incorporation power electronics-based and other static controllers to enhance controllability and increase power transfer capability.

               The various types of FACT controllers include the shunt connected, series connected controllers and a combination of these two. Of these we have used the shunt connected controller.

TCR-FC is an SVC device which offers fast, effective and continuous control of voltage which compensates both for over voltage and under voltage.    

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 Reactive Power Compensation in railways using active Impedance concept projects explains about using impendance topolgy in AC choppers for efficient power compenstion at a range of 25 kV/50Hz railways. By using AC-AC converters in railway networks causes power losses so there are VSI based STATCOM methods are used to solve this losses which make concept more interesting in handling power consumption in high voltage railway networks.

This method is already implemented in Frech railways which is a big success. This paper explains a new method with detailed design with circuit diagram for providing solution for this problem. This method can be implemented with low budget and minimal power losses in the network. 

In present system railway networks works on old models like locomotives in which thyristor rectifiers are used. In this method powe consumption is high so compensators are used as a alternate method.

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This New Technology for High Voltage Direct current using VSC-HVDC System project explains about opeation of HVDC using VSC-HVDC system. This new technology can be mostly  useful in the situvations where there is low power on receiving side in a passive network. In order to provide the solution this paper explans how VSC-HVDC is used in passive networks. This project uses dq frame in side a control system.

Initially a full fledged testing is performed about the perfromence of HVDC using VSC-HVDC. PSCAD/EMTDC simulators are used for generating results of the performance. Based on this test results it states that using VSD-HVDC can succesfully provide required amount of power to passive network. 

This paper explains advantages of new technology and the power  supply ratio to passive network. This paper contains circuit diagrams and equations for futher analysis for developing this project.

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Unified power flow paper explains about how to control changes in transmission line by injecting required voltage to the transmitting line. Transmission control on power flow is a important issue that to be controlled to save power. So this paper explains in detail about new method called Unified power flow controller which is implemented at transmission line.

The main features of this method are it will control transmission line in power system and manged bus voltage in transmission line. This method is initialized between two transmission lines and this method of connection is called as interline unified power flow controller. This application uses FACTS technology. This paper covers details of this method with block diagrams introduction and 48 Pulse VSI, IUPFC Model, Main functionalities of IUPFC and Analysis.

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