UPQC Control Research Articles

Optimizing Renewable Energy Integration in Weak Grids with UPQC Controller

Optimizing Renewable Energy Integration in Weak Grids with UPQC Controller

Optimized PI Gain in UPQC Control Based on Improved Zero Attracting Normalized LMS

Optimized PI Gain in UPQC Control Based on Improved Zero Attracting Normalized LMS

Enhanced UPQC Control Scheme for Power Quality Improvement in Wave Energy Driven PMSG System

Enhanced UPQC Control Scheme for Power Quality Improvement in Wave Energy Driven PMSG System

A Novel Sliding Mode Based UPQC Controller for Power Quality Improvement in Micro-Grids

A Novel Sliding Mode Based UPQC Controller for Power Quality Improvement in Micro-Grids

Power Quality Analysis and Voltage Sag Indices Using Fuzzy Based Dual UPQC Under Unsymmetrical Fault Condition

Power quality is the major problem in the fast growing electical systems. Persistent increase in non linear loads have caused distortions in the distribution system leading to becoming unbalanced in the current and voltage waveforms which affect the quality of the power.The major power quality issues analyzed in this paper relate to voltage sag, reactive power, voltage harmonics, current harmonics, interharmonics, subharmonics, unbalanced voltage, unbalanced current, and inrush current of Induction motor.Also the line to ground fualt is created in the distribution system and analysed the power quality issues with conventional and Dual UPQC. The performance analysis of various power quality issues are compared with four different casessuch as conventional UPQC with SRF-PI controller, conventional UPQC with fuzzy controller, Dual UPQC with SRF-PI controller and Dual UPQC with fuzzy controller and the results are tabulated. The simulation results show that the performance of the fuzzy based dual UPQC controller is better than the conventional PI controller.

An Integration of dual UPQC controller for power quality compensation by extending its voltage regulation at grid side as a STATCOM IOP: Conference Series

This paper presents a modified controller by integrating dual unified power quality conditioners: iUPQC controller with its utilization in microgrid and power-quality applications. By utilizing this controller it extends the power quality characteristics just like the UPQC controller it offers reactive power regulation both at load-side bus voltage and at grid-side bus voltage, which also compensates voltage swell & sag. At grid-side iUPQC controller will work as a STATCOM, by providing all the conventional UPQC applications both at the grid-side and load-side. Simulink results are providing to validate the latest functionality of the apparatus.

Application of Fuzzy Controller for Improvement of Power Quality using UPQC

Generally, one of the custom power device in FACTS called unified power quality conditioner, which is used to compensate the voltage and current-related Power Quality issues in the distribution systems. The proposed UPQC technology have an advantage of reduced dc-link voltage without compromising its compensation capability. This new method also helps to meet the requirement of dc-link voltage for the shunt and series active filters of the UPQC. This type of topology has a capacitor in series with the interfacing inductor across the shunt active filter for filtering purpose, and the system neutral is also considered and directly connected to neutral of distribution system avoid the requirement of the fourth leg in the voltage source inverter. This paper also presents a concept for improving power quality of a power distribution system such as an FUZZY logic controller along with the UPQC control strategy. The simulation results are compared for both conventional PI controller and FUZZY controller.

Esa Based Upqc Controller to Improve Power Quality in Microgrid System

Generally, Power Quality is the main concern parameter in present power system scenario, the main causes for effecting the power quality is due to either harmonic distortion, voltage imbalances, reactive power variations. There are many techniques applied to maintain this power quality in literature. In Facts family, the UPQC controller plays a key role, because it uniquely controls all the transmission parameters. The UPQC controller is combination of series-shunt converters with common dc link. The signals required for these converters are generated by reference and actual signals of bus and dc link capacitor. Phase locked loop helps to provide the phase angle sequence required to improve power factor. In addition with, this paper is implemented with extended search algorithm to better control the dc link voltage for improving power quality. Mat lab/Simulink is used to test the system conditions and performance.

ENHANCING POWER QUALITY IN DC SYSTEMS WITH UPFC-BASED MULTILEVEL CASCADE CONVERTER

Mixture Although renewable energy is a good substitute for conventional energy, connecting it to the grid can provide new difficulties. Similarly, for wind turbines to keep the grid stable and reliable, they need to provide high-quality electricity. To reduce the harmful environmental effects of conventional energy generation, more wind turbines are being connected to the electrical grid. Understanding how disturbances impact the quality of the energy is important in order to connect a wind turbine to the grid. The voltage and frequency must be as stable as feasible. This stability may be obtained using FACTS devices. Inverters that are either voltage-source or current-source have been used recently to reduce oscillation in the power supply. Moreover, several of them are used to improve the transient and dynamic stability of wind power generating systems (WPGS). When a wind turbine is linked to the grid, it produces electrical switching behaviour, voltage sag and swell, flashing and harmonic emissions, and active and reactive energy. A three-phase grid-linked wind-driven induction generator's reactive power need may be adjusted in a number of methods, such as by applying instantaneous pq theory and UPQC to adjust for harmonics produced by a non-linear load connected to the PCC. MATLAB/SIMULINK is used to simulate the FACTS Device UPQC control mechanism in order to improve power quality.

Power quality and custom power improvement using UPQC

The Series and Shunt units don’t have a typical dc link. So their control systems not exactly as same as the traditional UPQC control strategies.This device can improve power quality and composes power electronic series which was in MV/LV Substation, alongside a few electronic-shunt units associated near the end users.Additionally, the increment in power quality can be given to the users we require the shunt units.It reduces the disturbances for all customers that supply main series unit. It provides the customerwith the shunt units. A proposed solution model of LV grid is 400-KVA is considered as steady-state performance and functionalizing units. Outcomes acquired under enduring state conditions justify the design picked and great gadget execution.

Improvement of Power Quality for Microgrid using Fuzzy based UPQC Controller

The main aim of this paper is to enhance the power quality problems in a micro grid system. A flexible ac distribution system is presented in this paper for improving the reliability and power quality of the distributed system to which the microgrid is connected. In order to improve the system computational time and response a new control algorithm is designed for controlling the Facts devices. The Fuzzy Controller is also employed in this paper for frequency tracking and for extracting the harmonic spectra of the grid voltages and load currents in a micro grid. The design concept is tested in different cases using MATLAB/SIMULINK.

Improvement of Power Quality for Microgrid using Fuzzy Based UPQC Controller

<p>Generally, the power systems are mainly effected by the continuous changes in operational requirement and increasing amount of distributed energy systems. This paper proposes a new concept of power-control strategies for a micro grid generation system for better transfer of power. The micro grids are obtained with the general renewable energy sources and this concept provides the maximum utilization of power at environmental free conditions with low losses; then the system efficiency is also improved. This paper proposes a single stage converter based micro grid to reduce the number of converters in an individual ac or dc grid. The proposed micro grid concept can work in both stand-alone mode and also in grid interfaced mode. The distortions that occur in power system due to changes in load or because of usage of non-linear loads, can be eliminated by using control strategies designed for shunt active hybrid filters such as series and shunt converters. A conventional Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality enhancement by reducing the distortions in the output power. The simulation results are compared among the two control strategies, that fuzzy logic controller and pi controller.</p>

Compensating PQ problem using ANFIS-based unified power quality conditioner

In this paper, an ANFIS-based UPQC controller is proposed for compensating the PQ problem. ANFIS is the combination of fuzzy inference system (FIS) and neural network which improves the performance of UPQC. In order to generate the discharging dc link voltage via bias voltage generator, ANFIS is used which allows the amalgamation of numerical and linguistic data. Subsequently, the neural network is trained by using the generated fuzzy rules and thus a desired output from the interference system is obtained. The output of ANFIS is injected to the line by the proposed UPQC system. Then, assessment is carried out to analyse the power quality problem by the compensating performance of proposed ANFIS-based UPQC. The assessment results are judged against those of neuro fuzzy controller (NFC), artificial neural network (ANN), and fuzzy logic controller (FLC)-based UPQC system.

A Novel Control Strategy of Three-phase, Four-wire UPQC for Power Quality Improvement

The current paper presents a novel control strategy of a three-phase, four-wire Unified Power Quality (UPQC) to improve power quality. The UPQC is realized by the integration of series and shunt active power filters (APF) sharing a common dc bus capacitor. The realization of shunt APF is carried out using a three-phase, four-leg Voltage Source Inverter (VSI), and the series APF is realized using a three-phase, three-leg VSI. To extract the fundamental source voltages as reference signals for series APF, a zero-crossing detector and sample-and-hold circuits are used. For the control of shunt APF, a simple scheme based on the real component of fundamental load current (I CosΦ) with reduced numbers of current sensors is applied. The performance of the applied control algorithm is evaluated in terms of power-factor correction, source neutral current mitigation, load balancing, and mitigation of voltage and current harmonics in a three-phase, four-wire distribution system for different combinations of linear and non-linear loads. The reference signals and sensed signals are used in a hysteresis controller to generate switching signals for shunt and series APFs. In this proposed UPQC control scheme, the current/voltage control is applied to the fundamental supply currents/voltages instead of fast-changing APF currents/voltages, thus reducing the computational delay and the required sensors. MATLAB/Simulink-based simulations that support the functionality of the UPQC are obtained.