International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 1 | Jan -2017
p-ISSN: 2395-0072
www.irjet.net
SIMULATION AND MODELING OF DYNAMIC VOLTAGE RESTORER FOR COMPENSATION OF VOLTAGE SAG AND VOLTAGE SWELL Sangita R. Kamble1, Khusbhu Patil2 M-Tech Student, Power Electronics and Power System, W.C.E.M, Nagpur (M.H), India 1 Asst. Professor, Power Electronics and Power System, W.C.E.M, Nagpur (M.H), India2
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract: Power Quality problem in a system leads to various disturbances such as voltage fluctuations, transients and waveform distortions that results in a mis-operation or a failure of end user equipment. There are different types of custom power devices like Distribution Static Compensator (DSTATCOM) and Dynamic Voltage Restorer (DVR) which can effectively use for mitigation of different type of power quality problems. This paper describes the technique of correcting the supply voltage sag and swell distributed system. DVR based on VSI principle. A DVR is a series compensation device which injects a voltage in series with which injects a current into the system to correct the power quality problems. This paper presents a power system operation with PI controller with abc to dq0 convertor approach. Results are presented to assess the performance of devices as a potential custom power solution. Improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of DVR in MATLAB/Simulink.
devices causes voltage reduction at load end leading to frequency deviations which results in interrupted power flow, scrambled data, unexpected plant shutdowns and equipment failure. Voltage lift up at a load can be achieved by reactive power injection at the load point of common coupling (PCC). The common method for this is to install mechanically switched shunt capacitors in the primary terminal of the distribution transformer. The mechanical switching may be on a schedule, via signals from a supervisory control and data acquisition (SCADA) system, with some timing schedule, or with no switching at all. The disadvantage is that, high speed transients cannot be compensated. Some sag is not corrected within the limited time frame of mechanical switching devices. Transformer taps may be used, but tap changing under load is costly.
Another power electronic solution to the voltage regulation is the use of a dynamic voltage restorer (DVR). DVR’s are a class of custom power devices for providing reliable distribution power quality. They employ a series of voltage boost technology using solid state switches for compensating voltage sags. The DVR applications are mainly for sensitive loads that may be drastically affected by fluctuations in system voltage.
Key Words: Voltage sag, Voltage swells, Park transformation, DVR, MATLAB/Simulink. 1. INTRODUCTION The electric power system is considered to be composed of three functional blocks - generation, transmission and distribution. For a reliable power system, the generation unit must produce adequate power to meet customer’s demand, transmission systems must transport bulk power over long distances without overloading and distribution systems must deliver electric power to each customer’s premises from bulk power systems. Distribution system locates the end of power system and is connected to the customer directly, so the power quality mainly depends on distribution system. With the advent of myriad sophisticated electrical and electronic equipment, such as computers, programmable logic controllers and variable speed drives which are very sensitive to disturbances and non-linear loads at distribution systems produces many power quality problems like voltage sags, swells and harmonics and the purity of sine waveform is lost. [1][2] Voltage sags are considered to be one of the most severe disturbances to the industrial equipment’s. Power distribution systems, ideally, should provide their customer with an uninterrupted power flow at smooth sinusoidal voltage at the contracted magnitude level and frequency .A momentary disturbance for sensitive electronic
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2. CONVENTIONAL SYSTEM CONFIGURATION OF DVR Dynamic Voltage Restorer is a series connected device designed to maintain a constant RMS voltage value across a sensitive load. The DVR considered consists of: a. an injection / series transformer b. a harmonic filter, c. a Voltage Source Converter (VSC) d. an energy storage and e. a control system , as shown in Figure
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