Abstract: Presented paper shows a three phase four wire system followed by balanced/unbalanced non-linear load which further connected with the DSTATCOM for which gating signals are provided by the influence of pulse generator; it consist a control algorithm for achieving the required reference current for Voltage Source converter of DSTATCOM using Synchronous reference frame (SRF) method. The modeling of system is depending upon the a-b-c stationary frame to 0-d-q rotating frame transformation of the ac system variables. The currents injected by the DSTATCOM are controlled in the synchronous 0-d-q frame using a hysteresis based current control (HBCC) strategy. By using the Synchronous reference frame (SRF) method the undesired harmonic components are separated from the sensed nonlinear load currents. To improvise the output of the controller PI, the feedback loop to the integral term is taken into account. For the synchronization of desired output voltage Phase Locked Loop (PLL) with PI filter is used. The results confirm the performances considered theoretically for the DSTATCOM topology in MATLAB/Simulink. Keywords: DSTATCOM, Hysteresis band current controller (HBCC), Proportional integral controller (PI), Power Quality (PQ), Synchronous reference frame (SRF) theory. INTRODUCTION In power system, frequency fluctuation problem is a worldwide problem and dealt globally. Power quality is a concern that becomes gradually important to electricity customers in all respective stages of usage. The increasing number of power electronics based equipment has dangerously impacted the quality of electric power supply. With every non-linear load in system, harmonics are produced which reduces power quality. The occurrence of harmonics in power supply system offers a severe power quality issues that results in greater power losses in the distribution system and responsible for operation failures of electronic equipment. As in three phases the 5th, 7th and 11th order harmonics are more dominating so the current wave is not pure sin wave. To introduce dynamic and adaptable solutions of such power quality disturbances, efforts are continue by the influence of power electronic devices, FACTS, filters and different type of control technique to mitigate the power quality problems. Various reserches presenting a comprehensive review on compensating gadgets for improvement of power quality from the system. By using * Shivani Patel Shivani Patel*, Dept. of Electrical and Electronics Engineering, Oriental Institute Of Science and technology, Bhopal, India. Email: [email protected]Dr. Monika Jain, Dept. of Electrical and Electronics Engineering, Oriental Institute Of Science and technology, Bhopal, India. Email:[email protected]active power filters, synchronous condensers, passive filters, compensating devices such as shunt compensating device (DSTATCOM) series compensating device (DVR) and hybrid of shunt and series compensating device (UPQC).[1,2] The proper solution for all that above discussed problems can be solved in proposed system using Distribution Static Compensation (DSTATCOM) for grabbing this benefit [3]. Control techniques for DSTATCOM used for determining the reference current generation to maintain sinusoidal source currents applied to nonlinear loads. These techniques are used for the calculation of compensating current. Paper presents control technique of generating the compensating supply current using, the Synchronous reference frame (SRF) Theory [4, 5]. The proposed system was studied, designed and modelled in MATLAB/Simulink package with a DSTATCOM to to simulate its behavior and compensate the harmonics current inject by the loads. The results obtained showed that the proposed SRF control algorithm for four-leg VSC based DSTATCOM has been designed to provide the desired waveforms as a results for load balancing, reactive power control, neutral current compensation and compensation of current harmonics, under three phase four wire nonlinear balanced and unbalanced nonlinear system [6,7,8]. SYSTEM DESCRIPTION The system represents a three phase four wire system main components of system are Source followed by a VI measurement, nonlinear load for balance and unbalanced system and there is a DSTATCOM connected in parallel for which gating signals are provided by the pulse generator also including subcomponents as, Voltage source inverter, Capacitor at dc link, Reference current generator and Current Controller shown in Fig1. Three phase source Three phase balanced/ unbalanced Linear/non-linear load Three phase V-I measurement Pulse generator DSTATCOM gn gabc Vsxa Vsxb Vsxc Isxc Isxb ILxa ILxb Neutral ISN Isxa ILN Gate pulse for DSTATCOM ILxc Fig.1. Block diagram of proposed system Power Quality Enhancement and Designing of DSTATCOM Using SRF Theory Shivani Patel, Dr. Monika Jain Oriental Institute of Science and Technology [email protected][email protected]Journal of Information and Computational Science Volume 9 Issue 9 - 2019 ISSN: 1548-7741 www.joics.org 858
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Abstract: Presented paper shows a three phase four wire system
followed by balanced/unbalanced non-linear load which further
connected with the DSTATCOM for which gating signals are
provided by the influence of pulse generator; it consist a control
algorithm for achieving the required reference current for Voltage
Source converter of DSTATCOM using Synchronous reference
frame (SRF) method. The modeling of system is depending upon
the a-b-c stationary frame to 0-d-q rotating frame transformation
of the ac system variables. The currents injected by the
DSTATCOM are controlled in the synchronous 0-d-q frame using
a hysteresis based current control (HBCC) strategy. By using the
Synchronous reference frame (SRF) method the undesired
harmonic components are separated from the sensed nonlinear
load currents. To improvise the output of the controller PI, the
feedback loop to the integral term is taken into account. For the
synchronization of desired output voltage Phase Locked Loop
(PLL) with PI filter is used. The results confirm the performances
considered theoretically for the DSTATCOM topology in
MATLAB/Simulink.
Keywords: DSTATCOM, Hysteresis band current controller
(HBCC), Proportional integral controller (PI), Power Quality
(PQ), Synchronous reference frame (SRF) theory.
INTRODUCTION
In power system, frequency fluctuation problem is a
worldwide problem and dealt globally. Power quality is a
concern that becomes gradually important to electricity
customers in all respective stages of usage. The increasing
number of power electronics based equipment has
dangerously impacted the quality of electric power supply.
With every non-linear load in system, harmonics are
produced which reduces power quality. The occurrence of
harmonics in power supply system offers a severe power
quality issues that results in greater power losses in the
distribution system and responsible for operation failures of
electronic equipment. As in three phases the 5th, 7th and 11th
order harmonics are more dominating so the current wave is
not pure sin wave. To introduce dynamic and adaptable
solutions of such power quality disturbances, efforts are
continue by the influence of power electronic devices,
FACTS, filters and different type of control technique to
mitigate the power quality problems. Various reserches
presenting a comprehensive review on compensating gadgets
for improvement of power quality from the system. By using
* Shivani Patel Shivani Patel*, Dept. of Electrical and Electronics Engineering, Oriental
Institute Of Science and technology, Bhopal, India. Email: