ENHANCEMENT OF POWER QUALITY BY USING D-STATCOM

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NOVATEUR PUBLICATIONS International Journal of Research Publications in Engineering and Technology [IJRPET] ISSN: 2454-7875 VOLUME 3, ISSUE 4, April-2017

ENHANCEMENT OF POWER QUALITY BY USING D-STATCOM PRERANA TODKAR Student, Electrical Dept. SETI, Panhala, India YOGITA LOHAR Student, Electrical Dept. SETI, Panhala, India ASHISH TAWADE Student, Electrical Dept. SETI, Panhala, India SUPRIYA POWAR Student, Electrical Dept. SETI, Panhala, India V. T. METKARI Assistant Professor, Electrical Engineering, Dept. SETI, Panhala, India ABSTRACT: The main concern of consumer in power system is the reliability of supply that is, the continuity of electricity. Now a day, quality of electricity supply is very important for consumers. At the generating plant it generates voltages almost perfectly sinusoidal at rated magnitude and at rated frequency. The power quality problems starts from transmission system and stay at the end of distribution system. And these power quality problems faced the consumers. The electrical and electronic equipments are failure when faced one or more power quality problems. Hence, now a day power quality is serious problem in power network. To overcome this problem the device D-STATCOM is used. These power quality problems are overcomes by using various FACTS devices. KEYWORDS: Voltage source converter (VSC), PWM generator, Microcontroller, MATLAB Simulation. I. INTRODUCTION: Power quality is more serious problem in power network system. To overcome this problem many FACTS devices are used such as DVR, D-STATCOM and UPFC etc. DVR is related with the voltage and which is connected in series with the system. D-STATCOM is related with the current and which is connected in shunt to the system. And UPFC is the combination of both DVR and D-STATCOM devices [4]. So that to improve the power quality D-STATCOM is used. It reduces the effect of load on the magnitude of bus voltage and it keeps the voltage at desired level. D-STATCOM is the FACTS device which is used to overcome the power quality problems and it is connected in parallel to the system. D-STATCOM is the shunt device and which is based on the voltage source converter (VSC). The main advantage of D-STATCOM is that it can generate or absorbs the reactive power required to the distribution

system. D-STATCOM is used to minimize the harmonics present in the system. Also it minimizes the voltage sag and voltage swell problems. It also used to overcome the effect of poor power factor. II. POWER QUALITY PROBLEMS: Due to inherent non- linearity of power electronic devices, they draw harmonics and reactive power from the supply. In multiple phase systems such as 3 phase system they could also cause unbalance and draw excess neutral currents. Due to these reactive power loads, unbalance, harmonics and excess neutral currents it leads to low efficiency of system and poor power factor. Apart from this, power system also confronts transients like voltage sags, swells, and flickers etc. [5]. These transient problems impact voltage at distribution level. Various Power Quality Problems are as listed below-. • Voltage swell / over voltage • Voltage dip / under voltage • Harmonic distortion in Voltage and current signals • Voltage and current transients • Voltage flicker A. VOLTAGE SWELL / OVER VOLTAGE: The instantaneous increase in rms voltage supplied by mains beyond normal tolerance for the duration more than one cycle up to few seconds [6].

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Figure 1 .Voltage swell / over voltage


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