scholarly journals Fuzzy with Hysteresis Controller for Power-Quality Improvement of Grid Interconnected System

2020 ◽  
Vol 9 (3) ◽  
pp. 4059-4062
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Distribution Systems ◽  
Harmonic Distortion ◽  
Voltage Sag ◽  
Interconnected System ◽  
Logic Control ◽  
Unbalanced Voltage ◽  
Hysteresis Controller ◽  
Power Quality Improvement

The grid connected distribution systems are providing the energy to the load from the grid. During the period of energy transmission, the issues are occurred on the power quality in transmission line. In the power system, the power quality issues are occurred due to the following issues as instability of the system, voltage sag, harmonic distortion, over voltage, unbalanced voltage etc. In this paper, the power quality improvement is designed using the inverter which compensates the voltage and current when the fault occurred. This inverter is used to inject the power using a DC source. This improvement of power quality is controlled by the hysteresis controller with fuzzy logic control. The feedback is given to the controller which reduces the error from the system and provides the control variables to the inverter terms of switching gate signals.

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 Parallel Connected Multi-DSTATCOM for Power Quality Improvement in Distribution System

2019 ◽  
Vol 8 (9S3) ◽  
pp. 359-364
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Distribution System ◽  
Distribution Systems ◽  
Reactive Power ◽  
Control Logic ◽  
Electrical Transmission ◽  
Linear Type ◽  
Non Linear ◽  
Power Quality Improvement

Sending power with good quality is the main objective of electrical transmission system. The load nature, in particular non-linear loads, makes the current at the point of common coupling (PCC) to include harmonics which further affects the other loads connected at PCC. Power quality improvement and management is an important study for the enhancement of electrical transmission and distribution systems to enrich the quality of power delivered at the utilization point. DSTATCOM is one among the FACTS controllers to improve the power quality by nullifying the effect of harmonics at PCC. This paper presents the analysis of dual DSTATCOM topology. In this each DSTATCOM is burdened such that the total compensating currents is shared between the two. Dual STATCOM topology is tested and the result analysis is shown with varying non-linear type loading conditions. Dual DSTATCOM is controlled using Instantaneous Reactive Power theory control logic. Parallel DSTATCOM has the advantage of reduction of switch rating and switching losses. The simulation work is carried out using Matlab/Simulink software

scholarly journals UPQC Based Power Quality Improvement

2020 ◽  
Author(s):  
iftikhar manzoor
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Power Factor ◽  
Power Factor Correction ◽  
Voltage Sag ◽  
Power Quality Improvement ◽  
Voltage Swell ◽  
Power Quality Conditioner

UPQC Based power quality conditioner covers all power quality problems. Problems covers by UPQC are Voltage Sag, Voltage Swell, voltage imbalance, Power factor correction, harmonics mitigation.

scholarly journals Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6938
Author(s):  
Holman Bueno-Contreras ◽  
Germán Andrés Ramos ◽  
Ramon Costa-Castelló
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Control Strategy ◽  
Closed Loop ◽  
Mimo Systems ◽  
Control Strategies ◽  
Harmonic Distortion ◽  
Phase System ◽  
Coupling Effects ◽  
Power Quality Improvement

Performance degradation is, in general, regarded as a power quality problem. One solution to recover grid performance is through the application of a unified power quality conditioner (UPQC). Although these devices are multi-input/multi-output (MIMO) systems, the most common control strategies consist of two decoupled controllers, which neglect the coupling effects and add uncertainty to the system. For this reason, this paper proposes a multivariable resonant observer-based control strategy of a UPQC system. This method includes all significant coupling effects between this system and the grid. This strategy results in a stability-based compensator, which differs from recently proposed strategies that are based on signal calculation and cannot assure closed-loop stability. In addition, this paper introduces a simplified controller tuning strategy based on optimal conventional methods without losing closed-loop performance. It implies that the controller can be easily tuned, despite the complexity of the MIMO dynamic model. The UPQC with the resonant observer is verified on an experimental setup for a single-phase system, obtaining three relevant results for power quality improvement: (1) harmonics compensation tested with a total harmonic distortion limit of 5%; (2) sags and swells mitigation; and (3) power factor correction, achieving a unitary value on the grid side.

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