Power Quality Control Research Articles

A Hybrid Gallium-Nitride–Silicon Direct-Injection Universal Power Flow and Quality Control Circuit With Reduced Magnetics

A Hybrid Gallium-Nitride–Silicon Direct-Injection Universal Power Flow and Quality Control Circuit With Reduced Magnetics

Reactive Power Compensation for Standalone Hybrid Power System Using Facts Devices

Reactive power compensation is essential in hybrid grid-connected systems because power electronic inverters utilized for supplying DC energy into the grid causes a reduction in the overall power factor of the power systems. Due to the ability to provide a reliable and efficient power supply to remote and off-grid areas, hybrid power systems are growing in popularity. It can provide greater opportunities for operational growth by combining economic and technology advancement. To meet the demand for electrical energy in both regular and critical situations, operators must be in charge of the power systems reliable and secure operation. The primary objective of the work is to control the reactive power flow in a grid-connected hybrid renewable energy system (PV-wind-battery). The power quality problems that these systems frequently experience include voltage sags, harmonics, and flicker. A FACTS device Unified Power Quality controller (UPQC) with a Genetic Algorithm based PI controller is suggested to handle these power quality issues. In order to improve the performance of the power system, the proposed optimization approaches are used to tune the UPQC in a multiline transmission system. The model was developed with the help of the MATLAB/Simulink work framework.

Enhanced power quality control of a photo voltaic power plant integrated with multiple electric vehicle

Enhanced power quality control of a photo voltaic power plant integrated with multiple electric vehicle

PlugGuard: A Neural Network-Based Power Quality Control System for Plug Loads

PlugGuard: A Neural Network-Based Power Quality Control System for Plug Loads

PREVALENCE AND PATTERN OF WORK-RELATED DISORDER AMONG OIL AND GAS WORKERS IN KADUNA REFINERY, NIGERIA

This study examined the frequency and distribution of musculoskeletal problems among Kaduna Refining and Petrochemicals Company Limited (KRPC) engineers, desk workers, security. Data for the study were gathered using a modified online version of the Nordic musculoskeletal questionnaire. The prevalence and patterns of musculoskeletal disorder (MSD) were assessed and data from a survey given to KRPC employees was analyzed using SPSS. According to the survey, there were 62.4% of MSD cases among KRPC employees overall over 12 months. The prevalence of MSD was highest for lower back (%), followed by upper back (%) and the wrist (%). Years of experience and MSD were significantly associated (P >0.05). Employees with 16 to 25 years of work experience had a very high prevalence of MSD (84.9%). The power plant and quality control (PPQ and C) departments as well as the maintenance department had the highest rates of MSD. The findings can be used by KRPC management and any other refinery to address MSD problems among its employees and to close a gap in the body of knowledge regarding how MSD affects refinery workers in general.

Voltage Compensation Method for Multi-feeder Distribution Networks Based on a UPQC with PV Injection

Abstract In response to the problem of prolonged low voltage at the end of distribution grids, a voltage compensation method for multi-feeder distribution networks based on a unified power quality controller (UPQC) with PV injection is proposed in this paper. In the proposed scheme, two series inverters, a single parallel rectifier and photovoltaic (PV) system are flexibly interconnected via DC bus. The voltage attenuation can be compensated by the two series inverter, and the parallel rectifier is capable of supplying energy to the DC side of the two series inverters on adjacent AC feeders. Meanwhile, active power can also be supplied by the PV panel through a DC/DC converter. The operation modes and control strategies of the proposed method are analyzed in-depth. Finally, a MATLAB/Simulink model is shown to verify the effectiveness of the method proposed in this paper.

Control and Improvement of Power Quality in Hybrid Three-Terminal AC/DC Microgrids

Control and Improvement of Power Quality in Hybrid Three-Terminal AC/DC Microgrids

Fuzzy Control Systems for Power Quality Improvement—A Systematic Review Exploring Their Efficacy and Efficiency

Fuzzy-based control systems have demonstrated a remarkable ability to control nonlinear processes, a characteristic commonly observed in power systems, particularly in the context of power quality enhancement. Despite this, an updated and comprehensive literature review on the applications of fuzzy logic in the domain of power quality control has been lacking. To address this gap, this study critically examines published research on the effective and efficient use of fuzzy logic in resolving quality issues within power systems. Data sources included the Web of Science and academic journal databases, followed by an evaluation of target articles based on predefined criteria. The information was then classified into seven categories, including control system type, features of the fuzzy logic controller, fuzzy logic inference strategy, power quality issue, control device, implementation methodology (efficacy testing), and efficiency improvement. Our study revealed that fuzzy-based control systems have evolved from simple type-1 fuzzy controllers to advanced control systems (type-2 fuzzy and hybrid) capable of effectively addressing complex power quality issues. We believe that the insights gained from this study will be useful to both experienced and inexperienced researchers and industry engineers seeking to leverage fuzzy logic to enhance power quality control.

International Cooperation as a Component of Japan's Energy Security

The importance of international cooperation is considered in the context of ensuring Japan's energy security. The concept of energy security and its importance for the sovereignty of the state is analyzed. The role of international energy relations in the modern world is analyzed, and the strategic partnerships that Japan is developing to ensure sustainable access to resources are highlighted. Special attention is paid to Japan's diplomatic efforts aimed at diversifying energy sources, ensuring technological exchange and promoting the development of energy-efficient solutions. Japan has historically considered international cooperation as one of the ways to solve its energy problems. The country is a member of many international organizations and actively participates in international conferences and initiatives. Japan is not only a stable importer of resources, but also an exporter of various energy technologies. Japanese electric power companies operate all over the world. Each of Japan's electric power companies has individual agreements with foreign companies to share a wide range of information including that on power generation, distribution and quality control. Due to the fact that Japan does not have a significant raw material base for the development of industry and meeting energy needs, the main tool for solving the country's resource problems is to build active long-term relationships with resource-rich countries. The conducted research shows that ensuring stable supplies of energy resources has been the cornerstone of Japan's economic diplomacy for many decades. The article emphasizes the importance of global cooperation in the field of energy for ensuring sustainable development and ensuring national energy security in the face of modern challenges and changes in the global energy paradigm.

Dual-layer loss reduction strategy for virtual distribution transformer integrating energy storage converter

To solve the problem that power quality disturbance aggravates the loss of distribution network in new power systems, this paper proposes a loss reduction strategy for virtual distribution transformer with integrated energy storage converter. Firstly, the concept of the virtual distribution transformer is defined through the analysis of the impact of complex power quality disturbances on distribution network losses. Secondly, a dual-layer control strategy for loss reduction based on the virtual distribution transformer is proposed. In the outer control layer, power quality control considering the load rate of the distribution transformer is achieved by extracting the integrated command signal that incorporates load fluctuations and using the improved quasi-proportional resonance controller. In the inner control layer, a grid-connected power stabilization strategy based on an adaptive double-window moving average filter is proposed, which adjusts the sliding window length in real-time according to the amplitude of fluctuation and state of charge, ensuring power meets the grid-connected standard while improving energy storage charge and discharge margins. Finally, simulation results validate that the proposed strategy enables the rapid realization of functions such as virtual capacity enhancement for distribution transformers, power flow control, and integration of new energy sources within short time scales while effectively reducing operating losses in low-voltage distribution networks.

Voltage and Reactive Power-Optimization Model for Active Distribution Networks Based on Second-Order Cone Algorithm

To address the challenges associated with wind power integration, this paper analyzes the impact of distributed renewable energy on the voltage of the distribution network. Taking into account the fast control of photovoltaic inverters and the unique characteristics of photovoltaic arrays, we establish an active distribution network voltage reactive power-optimization model for planning the active distribution network. The model involves solving the original non-convex and non-linear power-flow-optimization problem. By introducing the second-order cone relaxation algorithm, we transform the model into a second-order cone programming model, making it easier to solve and yielding good results. The optimized parameters are then applied to the IEEE 33-node distribution system, where the phase angle of the node voltage is adjusted to optimize the reactive power of the entire power system, thereby demonstrating the effectiveness of utilizing a second-order cone programming algorithm for reactive power optimization in a comprehensive manner. Subsequently, active distribution network power quality control is implemented, resulting in a reduction in network loss from 0.41 MW to 0.02 MW. This reduces power loss rates, increases utilization efficiency by approximately 94%, optimizes power quality management, and ensures that users receive high-quality electrical energy.

Analysis of arm, back and leg strength on the quality of power control in billiard sports

Background and Study Aim. This study aims to analyze the strength of the arms, back and legs on the quality of power control in billiards.
 Material and Methods. This research belongs to the type of quantitative research with a correlational design that aims to analyze the magnitude of the influence exerted by the physical components on the quality of its power control. A total of 43 male pool athletes aged 14 to 20 years participated in this study. The instruments used in the study were a 30-second push-up test to measure arm strength, as well as a back and leg dynamometer to measure back and leg strength. Measurement of power control test by means of a cue ball is placed in the place of the chocolate to start. Players must hit the cue ball to the front of the table, aiming for the cue ball to stop as close to the table cushion in front of it as possible. Data analysis was carried out to produce data according to the research objective, namely to calculate the correlation between the independent and dependent variables. The value above will appear as a table that displays the sig. value and the correlation value that can be converted to a percentage. The calculation used SPSS version 23.
 Results. The results of the multiple correlation analysis in this study reported no significant relationship between arm, back, and leg strength with power control (sig. 0.517).
 Conclusions. It can be concluded that there is no correlation between leg strength, back strength, and arm muscle strength on the quality of power control of billiard players, and the correlation given by the variable leg strength, back strength, and arm muscle strength on the quality of power control is 5%.

Research on Building Power Quality Assessment and Control Technology Based on Online Monitoring

This study is to improve the assessment accuracy and control efficiency of building power quality by adopting online monitoring and integrating multiple technical indicators and control methods. A whole set of power quality technical index system is developed in the study, involving voltage deviation, harmonic voltage/current limit, and so on. The power quality indicators are quantitatively evaluated through standardization and weight determination. The assessment results show that the measured power quality indicators vary within the interval of 0 to 9, which verifies the effectiveness of the assessment system. In terms of control technology, this paper discusses in depth the static reactive power compensation (SVC) device and its role in improving building power quality, and confirms its efficacy in optimizing power quality through simulation experiments. This work not only successfully evaluates the building power quality, but also proposes practical control strategies, which provide theoretical and practical guidance for the stable operation of power systems and the further improvement of power quality.

Si/WBG Hybrid Half-Bridge Converter Using Coupled Inductors for Power Quality Improvement and Control Simplification

Si/WBG Hybrid Half-Bridge Converter Using Coupled Inductors for Power Quality Improvement and Control Simplification

An adaptive controller for power quality control in high speed railway with electric locomotives with asynchronous traction motors

Introduction. Power quality in an electric railway system pertains to the dependability, consistency, and purity of the electrical power provided to different components and systems within the railway infrastructure. Assessing power quality offers considerable opportunities to improve the efficiency of railway systems. Problem. Managing the flow of active and reactive power effectively, decreasing harmonic currents, and addressing the negative sequence component are all critical parts of improving power quality for electrified rail systems. As a result, flexible AC transmission systems are the major means of minimizing or decreasing these difficulties. Purpose. This study describes a half-bridge reactive power railway power conditioner (HB-RPC) with a novel Ynev balancing transformer. HB-RPC is made up of four switching devices and two DC capacitors and the compensator’s stability is determined by the operating voltage of the DC-link. Any variations or imbalances in the DC voltage might cause the compensator to operate in an unstable manner. Novelty. Of a novel balanced transformer with HB-RPC in a high-speed railway system with two scenarios. Methods. The study utilized MATLAB/Simulink software for simulation purposes. The system integrates a fuzzy logic controller (FLC) and a PI controller to optimize DC voltage, ensuring its constancy and balance, with the objective of improving the overall stability of the system. Results. The simulation outcomes illustrate the efficacy of the control approach. Through a comparison of results between scenarios (two and four trains) with the PI-based-HB-RPC and the FLC-based-HB-RPC, the system exhibits enhanced stability for the proposed railway system when employing the FLC-based-HB-RPC, compared to a controller based on PI. Practical value. The proposed configuration elucidates its role in enhancing both the dynamic performance of the system and the power quality of the three-phase rail traction chain.

Research on power quality control method for island microgrid based on event-triggered consensus algorithm

Research on power quality control method for island microgrid based on event-triggered consensus algorithm

Power Quality Control of Micro Hydro Power Plant Based-ELC and VSI Using Fuzzy-PI Controller

Stability of frequency and voltage of micro hydro power plant (MHPP) are influenced by sufficiency of active power and reactive power respectively in handling load power. These powers are normally controlled by Electronic Load Controller (ELC) and Voltage Source Inverter (VSI), respectively. VSI is specifically added to compensate reactive power caused by inductive load. The objective of the study is to control active power and reactive power in MHPP system against the changes in load power through the improvement of ELC and VSI output responses by applying Fuzzy-PI controller. ELC applied Fuzzy-PI controller to obtain more precise TRIAC ignition angle to meet a suitable active power to balance the load power. While VSI implemented Fuzzy-PI controller to meet a precise reactive power needed to oppose inductive load power. Capability of Fuzzy-PI controller in improving ELC and VSI performance were assessed by using Matlab in complete MHPP model. Assessments on the proposed controller indicate that it was effective in improving the performance of both ELC and VSI. By applying Fuzzy-PI controller on ELC, a precise ignition angle of TRIAC stimulated a more precise ballast load to balance active power against the load power. While the addition of Fuzzy-PI controller on VSI produced more suitable reactive power to compensate for the inductive load presence. With a more stable frequency and voltage against changes in load power, the power quality of the MHPP also improve.

Control Approach of Grid-Connected PV Inverter under Unbalanced Grid Conditions

In grid-connected photovoltaic (PV) systems, power quality and voltage control are necessary, particularly under unbalanced grid conditions. These conditions frequently lead to double-line frequency power oscillations, which worsen Direct Current (DC)-link voltage ripples and stress DC-link capacitors. The well-known dq frame vector control technique, which is effective under normal conditions, struggles with oscillatory component management in unbalanced grid conditions. To address this issue, this paper presents an advanced control approach designed for grid-connected PV inverters. The proposed approach is effective at reducing oscillations in the DC-link voltage at double the grid frequency, thereby enhancing system stability and component longevity. This method introduces a feedback control method designed to regulate oscillatory components that appeared within the dq frame and suppress the DC-link voltage oscillations under imbalance conditions, including single line-to-ground (SLG) faults. Additionally, the control scheme incorporates a maximum power point tracking (MPPT) controller to optimize PV efficiency. Comprehensive simulations demonstrate the effectiveness of this method in maintaining sinusoidal current injections and stabilizing DC-link voltage during unbalanced grid conditions. Simulation results show that the control scheme effectively stabilizes DC-link voltage, maintains balanced grid current, and ensures constant active power under various conditions, including SLG faults and solar irradiance changes.

Safety-Constrained Multi-Agent Reinforcement Learning for Power Quality Control in Distributed Renewable Energy Networks

Safety-Constrained Multi-Agent Reinforcement Learning for Power Quality Control in Distributed Renewable Energy Networks

Enhanced Power Quality Control in Microgrid-Assisted Electric Vehicle Charging Systems Using ATOGI and CIDPC

Enhanced Power Quality Control in Microgrid-Assisted Electric Vehicle Charging Systems Using ATOGI and CIDPC