A Novel Method of Load Compensation Under Unbalanced and Distorted Voltages (original) (raw)

Load Balancing and Harmonic Elimination Using Distribution Static Synchronous Compensator (DSTATCOM)

2016

Distribution Static Synchronous Compensator (DSTATCOM) is a shunt compensating device which is used to improve current profile by exchanging of reactive power with unbalanced and nonlinear load. DSTATCOM is a shunt compensating device used for power quality improvement in distribution systems. Relevant solutions are applied for harmonics, fluctuation of voltage, voltage deviation, unbalance of three phase voltage and current and frequency deviation. Different controlling schemes such as Phase Control Method (PCM), Fryze Power Theory (FPT), Synchronous Reference Frame Theory (SRFT) and Instantaneous Reactive Power Theory (IRPT) are used for reactive power compensation with the help of Voltage source Inverter (VSI). In this project we are going to balance the source current using different control schemes. The results of different source currents are compared with a different control schemes in terms of active and reactive power and in terms of Total Harmonic Distortion (THD) for nonl...

IJERT-Control Algorithms of Distribution Static Compensator for Power Quality Improvement

International Journal of Engineering Research and Technology (IJERT), 2016

https://www.ijert.org/control-algorithms-of-distribution-static-compensator-for-power-quality-improvement https://www.ijert.org/research/control-algorithms-of-distribution-static-compensator-for-power-quality-improvement-IJERTV5IS010423.pdf This Paper presents power quality improvement using distribution static compensator (DSTATCOM) based on simple peak detection control algorithm for balanced source conditions and a non-iterative optimized algorithm for unbalanced and distorted supply conditions. This topology contains two control methods. In Simple peak detection control algorithm a three-phase, four-wire distribution static compensator (DSTATCOM) based on the peak detection of load currents for power quality improvement under linear/non-linear loads is considered. In this control algorithm, an extraction of active and reactive power components of load currents is based on a low-pass filter and the voltage unit vector in time domain. It is based on the mathematical formulations for fast and accurate estimation of reference supply currents. A four-wire DSTATCOM is modeled and simulated for linear and non-linear loads and results are presented. Performance of DSTATCOM is found quite satisfactory under balanced and unbalanced loads in three-phase, four-wire distribution system. In Non-iterative Optimized Algorithm a single-step non-iterative optimized algorithm for a three-phase four-wire shunt active power filter under distorted and unbalanced supply conditions is simulated. The main objective of the proposed algorithm is to optimally determine the conductance factors to maximize the supply-side power factor subject to predefined source current total harmonic distortion (THD) limits and average power balance constraint. The proposed algorithm is simple and fast as it does not incorporate complex iterative optimization techniques, hence making it more effective under dynamic load conditions. Moreover, separate limits on odd and even THDs have been considered. A mathematical expression for determining the optimal conductance factors is derived using the Lagrangian formulation. Performance of DSTATCOM is found quite satisfactory and is capable of providing load compensation under steady-state and dynamic load conditions

Mitigation of Voltage Unbalance by DSTATCOM in a Three Phase Four Wire System

Journal of Power of Technologies, 2020

This paper presents a Distribution Static Compensator (DSTATCOM) that uses a traditional Synchronous Reference Frame (SRF) to make source current in phase and sinusoidal in shape w.r.t source voltage, so that unity power factor is achieved at source side. In addition to this, a new concept of single phase synchronous d-q reference frame theory is used for generation of reference signals in a three phase distribution system for compensation of voltage unbalances at the load side. Further, this paper uses a traditional hysteresis controller for generation of switching signals for the Voltage Source Converter (VSC). Moreover, switching of DSTATCOM between Current Controlled Mode(CCM) and Voltage Controlled Mode(VCM) is carried out so that only single DSTATCOM serves the problem for current and voltage related Power Quality problems. Simulations are carried out in MATLAB/Simulink environment to validate the proposed scheme and results indicate that the unity power factor is achieved dur...