Informatics Publishing Limited

C. Prabhakar ¹, T. S. Prasanna ²

Affiliations
1 High Voltage Division, Central Power Research Institute, Bangalore 560080, IN
2 Associate Professor, Department of Electrical Engg., University Visveswaraya College of Engineering, Bangalore-560001, IN

Abstract

With the advent of Thyristor technologies, High Voltage Direct Current (HVDC) transmission system is used for transmitting large amount of power over long distance. It is a mature technology and has been playing a vital role in both long distance transmission and in the asynchronous interconnections. VSC-HVDC systems represent recent technology in the area of DC power transmission. One of the limitations in using conventional HVDC system is that it is difficult to connect to a weak network with no local generations nearby. VSCs are based on IGBTs that can be switched on and off by control signals and can be operated at high frequencies. Since VSC, has the capability to control both active and reactive power, it has become a widespread applications in power system. In this paper, the behavior of a VSC-HVDC system when connected to a passive network is studied under the steady state and transient conditions. The simulations are carried out using Real Time Digital Simulator (RTDS) available at CPRI, Bangalore. Simulation results proved that the modeled controller has good steady state and transient response during the faults. Performance of VSC-HVDC is also studied when feeding the loads like motors and found that the system response is satisfactory.

Keywords

VSC-HVDC, PWM, HVDC, RTDSTM, PI Controller

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C. Prabhakar ¹, T. S. Prasanna ², R. A. Deshpande ¹

Affiliations
1 Distribution Systems Division, Central Power Research Institute, Bangalore - 560080, IN
2 Associate Professor, Department of Electrical Engineering,University Visveswaraya College of Engineering, Bangalore - 560001, IN

Abstract

During earlier days, due to conventional loads power quality did not cause any problem as there was no effect on majority of the loads connected to the electrical distribution system. But in modern power systems, power quality is certainly a major concern. With the use of sophisticated devices, the performance is very sensitive to the quality of power supply. The most common type of power quality disturbance in the present days are voltage sags and swells. Among various devices proposed for this purpose for mitigation, VSC technology was considered as it has fast responses. This paper is intended to mitigate voltage sag using Distribution Static Compensator (D-STATCOM) for a test system. The simulation is carried out for a 9 bus test system using PSCAD^TM/EMTDC^TM to illustrate the use of D-STATCOM in mitigating the voltage sag in a distribution system.

Keywords

D-STATCOM, voltage sag, power quality, PSCADTM/EMTDCTM

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