International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
Implementation of Space Vector PWM for Hybrid DSTATCOM Mr. Deepak G. Pagar1, Prof. S. S. Khule2 1PG
Student, Dept. of EE, MCOERC College, India of Dept. of EE, MCOERC College, India ---------------------------------------------------------------------***--------------------------------------------------------------------2Head
Abstract - The inverters are used to converts dc power into
four wire, two level, and neutral point clamped VSI. Proposed scheme connects an LCL filter at the front end of VSI, which is followed by a series capacitor Cse. In traditional DSTATCOM topology considered in this paper, the same VSI is connected to the PCC through an inductor Lf. In LCL filter based DSTATCOM topology, an LCL filter is connected between the VSI and the PCC. The Proposed DSTATCOM compensates the current harmonics and reactive power required by the nonlinear load [7].
ac power at desired output voltage and frequency. The waveform of the output voltage depends on the switching states of the switches used in the inverter. The most commonly used techniques are Sine PWM and Space vector plus width modulation (SVPWM). SVPWM is considered to be superior performance than other PWM technics for Distribution static compensator (DSTATCOM) with better DC bus utilization. This paper focuses on a three-phase VSI using Space vector modulation for Hybrid DSTATCOM. Finally the simulation results of SVPWM are compared with un-compensated system. Key Words: Distribution static compensator (DSTATCOM), Pulse-width modulation (PWM), space-vector PWM (SVPWM), space-vector PWM (SVPWM), Voltage source inverter (VSI).
1. INTRODUCTION The increased use of power electronics based converters causes harmonics and unbalanced in distribution system; which results in poor power quality [1, 2]. In order to improve waveforms of voltage and current; active power filters have been proposed in literature [7]. The shunt active power filter is also known as Distribution static compensator (DSTATCOM); which injects equivalent compensating currents into the grid to compensate phase current harmonics; reactive power and load balancing. Space-vector modulation has become one of the most important PWM methods for three-phase converters [3]. There is various pulse-width modulation (PWM) techniques have been developed for DSTATCOM. The most popularly used PWM schemes for three-phase voltage source inverters are sinusoidal PWM and space vector PWM (SVPWM) [4]. The output voltage per phase for a sinusoidal PWM based three phase converter is restricted to 0.5Vdc (pinnacle esteem) and the line-to-line RMS voltage is 0.612Vdc. SVPWM is another direct advanced PWM procedure proposed in 1982. SVPWM based converter can have a higher output voltage at 0.707Vdc (Line-to-line, RMS).Reviewing the literature it can be concluded that SVPWM has certain advantages over SPWM [3]. The performance of the proposed topology is validated through the MATLAB 2013a simulation results.
Fig.1. Proposed DSTATCOM topology
3. SPACE VECTOR PWM (SV-PWM) TECHNIQUE The circuit model of a typical three-phase voltage source PWM inverter is shown in Fig. 2. The space-vector PWM technique aims to realize this slowly rotating voltage space vector (corresponding to fundamental component of output voltage) from the six active state voltage vectors and two null state vectors. The active state voltage vectors have a magnitude Vdc and they point along fixed directions whereas null state vectors have zero magnitude [2].
2. PROPOSED DSTATCOM TOPOLOGY Fig. 2 Three-phase PWM Inverter
The hybrid three Phase four Wire DSTATCOM is shown in Fig. 1. It is acknowledged utilizing a three phase,
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