Control Strategies for Load Compensation Using Instantaneous Symmetrical Component Theory Under Different Supply Voltages

2008 ◽  
Vol 23 (4) ◽  
pp. 2310-2317 ◽  
Author(s):  
U.K. Rao ◽  
M.K. Mishra ◽  
A. Ghosh
Keyword(s):  
Control Strategies ◽  
Load Compensation ◽  
Component Theory ◽  
Symmetrical Component ◽  
Supply Voltages

scholarly journals Review of three-phase inverters control for unbalanced load compensation

2019 ◽  
Vol 10 (1) ◽  
pp. 242 ◽  
Author(s):  
Raef Aboelsaud ◽  
A. Ibrahim ◽  
Alexander G. Garganeev
Keyword(s):  
Power Quality ◽  
Control Strategies ◽  
Power Electronic ◽  
Distributed Energy ◽  
Nonlinear Loads ◽  
Load Compensation ◽  
Research Areas ◽  
Three Phase ◽  
Unbalanced Load ◽  
Three Phase Inverter

<span>In the microgrid systems, three-phase inverter becomes the main power electronic interface for renewable distributed energy resources (DERs), especially for the islanded microgrids in which the power quality is easily affected by unbalanced and nonlinear loads, this is due to the fact that the voltage and frequency of the microgrid are not supported by the main power grid but determined only by the inverters. Therefore, the compensation of the load unbalances and harmonics in autonomous microgrid inverters are getting more attention in power quality research areas. The main purpose of this paper is to represent an overview of the control strategies of various inverters for unbalanced load compensation</span>

scholarly journals Power Quality Improvement using D-STATCOM with Instantaneous Symmetrical Component Theory

2020 ◽  
Vol 9 (4) ◽  
pp. 1263-1266
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Control Technique ◽  
Voltage Sag ◽  
Matlab Simulink ◽  
Voltage Dip ◽  
Component Theory ◽  
Symmetrical Component ◽  
Power Quality Improvement ◽  
Static Compensator

A technique is introduced to improve the voltage sag under sudden changes in load. The proposed technique is implemented by D-STATCOM (Distribution static compensator) and it is controlled by ISCT (Instantaneous Symmetrical Component Theory). Due to sudden changes in load, the voltage dip occurs at the time of switching of loads. At this time, the control technique generates reference currents and hysteresis block compares these currents with the reference currents and generates the pulses to D-STATCOM. Implementation of system along with compensation is carried out in MATLAB/SIMULINK

scholarly journals Simulation and RTDS Hardware Implementation of SHAF for Mitigation of Current Harmonics with p-q and Id-Iq Control Strategies Using PI Controller

2011 ◽  
Vol 1 (3) ◽  
pp. 54-62 ◽  
Author(s):  
S. Mikkili ◽  
A. K. Panda
Keyword(s):  
Hardware Implementation ◽  
Control Strategies ◽  
Pi Controller ◽  
Current Harmonics ◽  
Active Power Filters ◽  
Power Filters ◽  
Three Phase ◽  
Detailed Simulation ◽  
Supply Voltages ◽  
Real Time Digital Simulator

Control strategies for extracting the three-phase reference currents for shunt active power filters are compared, evaluating their performance under different source conditions in MATLAB/Simulink environment and also with Real Time Digital Simulator (RTDS) Hardware. When the supply voltages are balanced and sinusoidal, the two control strategies are converging to the same compensation characteristics but when the supply voltages are distorted and/or un-balanced sinusoidal, these control strategies result in different degrees of compensation in harmonics. The p-q control strategy is unable to yield an adequate solution when source voltages are not ideal.  Extensive Simulations are carried out with PI controller for both p-q and Id-Iq control strategies for different voltage conditions and adequate results were presented. The 3-ph 4-wire SHAF system is also implemented on RTDS Hardware to further verify its effectiveness. The detailed simulation and RTDS Hardware results are included.

scholarly journals A Novel Load-Balancing Method and Device by Intelligent Grouping Compound Switches-Based Capacitor Banks Shunt Compensation

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Qiuye Sun ◽  
Jianguo Zhou ◽  
Xinrui Liu ◽  
Jun Yang
Keyword(s):  
Load Balancing ◽  
Reactive Power ◽  
Distribution Networks ◽  
Compensation Method ◽  
Positive Sequence ◽  
Capacitor Banks ◽  
Component Theory ◽  
Symmetrical Component ◽  
Unbalanced Load ◽  
Zero Sequence

A novel compensator topology is proposed for three-phase unbalanced loads in the distribution networks. The negative and zero sequence compensation networks are proposed using delta-connected and star-connected capacitor banks. The compensation networks are paralleled with the unbalanced load to achieve a perfect balancing of active power and a complete compensation of reactive power of the unbalanced load. Intelligent grouping compound switches are implemented to control the capacitors, where, therefore, each capacitor can be switched between phases or phase and ground. Wireless sensors are also applied to acquire the load quantities. The compensation method proposed is based on symmetrical component theory. In addition, the load compensation based on instantaneous symmetrical component theory with positive sequence online extraction is proposed under unbalanced and distorted source voltages. The proposed load-balancing method and device are applied to Liaoning, Neimenggu, and Jilin provinces. The application results are provided to validate the performance of the proposed compensator topology and compensation method.

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