Energy Power Quality Research Articles

Reimagining Teaching Style Through Renewable Energy Quality Assessment—A Focus on Power Technology and Equipment

This article delves into teaching style translation strategies from the perspective of power energy quality assessment, using power technology and equipment as specific cases, with the aim of enhancing the international dissemination efficiency of power energy professional knowledge in the education field. Through detailed data analysis, this article reveals the rapid pace of technological updates and equipment upgrades in the power energy industry, especially in the fields of smart grids and renewable energy. As of 2023, the proportion of non fossil energy generation installed capacity worldwide has approached 50%, indicating that the power industry is accelerating its transition to green and low-carbon. This article pays special attention to the complex terms and concepts involved in the teaching of power technology and equipment. Using the principle of adaptability in translation theory, it analyzes how to accurately convey the precise meanings of these terms in the translation process, ensuring that international students can accurately understand and master key knowledge points. By comparing traditional teaching methods with a new teaching model that incorporates elements of power energy quality assessment, the study found that the latter performs more outstandingly in improving students' practical and problem-solving abilities. Specifically, the accuracy of students in simulating power system fault handling has increased by about 30%. In addition, this article also utilizes big data analysis technology to comprehensively sort out and evaluate teaching resources in the field of power energy, and finds that high-quality teaching materials and case sharing are crucial for improving teaching effectiveness. Based on the above analysis, this article proposes a series of optimization suggestions for teaching style translation, in order to provide strong support for the international education of power energy majors and promote the exchange and progress of global power energy technology.

Quality of power energy from wind power plant

The aim of this paper is to measure the quality of power coming from the wind power plant to the electrical distribution network. The quality of electrical energy includes many parameters but the main thesis target is to measure a harmonic frequency of current. I used the program Matlab for the simulation of the connection between the wind power plant and the electrical network. I simulated startup of the wind turbine and changes of wind flowing. Obtained data were plotted on graphs which show harmonic frequencies of current based on these changes.

YATAĞAN-MUĞLA TÜRKİYE’ DE KURULU OLAN 1 MW ŞEBEKE BAĞLANTILI BİR PV GÜÇ SANTRALİNDE MATLAB-SIMULINK PORTALINDA STATCOM YOLUYLA PERFORMANS İYİLEŞTİRİLMESİ

A grid-connected power system's performance depends on the produced energy's power quality and power coefficient. The higher the power quality of the energy transferred to the grid, the more critical it is for power plants, energy distribution systems and end-users. This study investigated the optimisation possibilities obtained by applying STATCOM (Static VAR Compensation) for a 1 MW PV-based Solar Power Plant (PV-SPP) in the Muğla-Türkiye province. First, the data of components such as the inverter and PV panel that make up the plant were obtained, and the raw MATLAB-Simulink modelling of the plant was carried out. System performance outputs were obtained by adding STATCOM modelling to the obtained modelling. The scientific results of the optimisation would be obtained if this technique was applied to the existing power plant. Since STATCOM also performs the RPC (Reactive Power Compensation) process, it is an up-to-date and effective technique that improves system energy power quality. According to the simulation results, this system with STATCOM draws 24,043% and 11,671% less reactive power and current than the non-STATCOM system.

A Review on Renewable Energy Sources in Microgrid

The utilization of RES to address electrical energy requirements is gaining traction as a potential solution to this issue of electrical energy shortages. The use of renewable energy sources in electrical generation systems is done in a variety of ways, including in microgrid systems. Microgrid technologies have massive benefits for both the user as well as the electric utility provider. There has been a lot of microgrid development in numerous nations since micro grids have a lot of benefits, such as higher power quality and being more ecologically friendly. Power generation, microgrid architecture, power electronics, control systems, and security devices are all areas of microgrid innovation. In this paper, it is demonstrated that persistence as well as artificial neural networks have certain qualities that make them useful to investigators of controllers at various levels of control that micro grids must have in order to be cost-effective, productive, as well as capable of meeting energy power quality and quantity requirements. Keywords: Renewable energy sources, Microgrid, persistence, Artificial Neural Network

Combined Method of Flow-Reduced Dump Load for Frequency Control of an Autonomous Micro-Hydropower in AC Microgrids

Nowadays, microgrids (MGs) play a crucial role in modern power systems due to possibility of integrating renewable energies into grid-connected or islanded power systems. The Load Frequency Control (LFC) is an issue of paramount importance to ensure MGs reliable and safe operation. Specifically, in AC MGs, primary frequency control of each energy source can be guaranteed in order to integrate other energy sources. This paper proposes a micro-hydro frequency control scheme, combining the control of a reduced dump load and the nozzle flow control of Pelton turbines operating in autonomous regime. Some works have reported the integration of dump load and flow control methods, but they did not reduce the dump load value and adjust the nozzle flow linearly to the power value demanded by users, causing the inefficient use of water. Simulation results were obtained in Matlab®/Simulink® using models obtained from previous research and proven by means of experimental studies. The simulation of the proposed scheme shows that the frequency control in this plant is done in correspondence with the Cuban NC62-04 norm of power energy quality. In addition, it is possible to increase energy efficiency by reducing the value of the resistive dump load by up to 7.5% in a case study. The validation result shows a 60% reduction of overshoot and settling time of frequency temporal behavior of the autonomous micro-hydro.

Analysis on the development of micro gas turbine generation technology

Similar to the structure of small aero engines, the existing micro gas turbines generally apply radial impeller machinery and regenerative cycles to improve efficiency. This paper analyzes the development of micro gas turbine generation technology. After making breakthroughs in basic research fields such as combustion, structural materials and coatings, additive manufacturing, thermal management, and comprehensive simulation and verification experiments, the next-generation micro cogeneration system composed of micro gas turbine and renewable energy power generation equipment will effectively obtain stable power output, improve power energy quality, and overcome difficulty in technology, economy, and application scenarios.

A Memory-Efficient True-RMS Estimator in a Limited-Resources Hardware

More and more human activities are increasingly dependent on the power quality energy they are supplied. In particular, those loads that have an electronic switching mode power supply (SMPS) and microcontrollers or microprocessors are very susceptible to de-energization of the AC line as voltage monitoring takes place on the DC end and may not have enough time to cope with a voltage event involving energy loss. There have been many proposals that analyze power quality or current consumption, even those using limited resources hardware or the classic formulas of discrete root mean square (RMS). In this proposal, an approximation to the problem by means of an RMS value estimator that uses as a base a microcontroller of basic range and low economic cost and algorithms of calculation of very low computational cost that elude complex arithmetic operation to controllers, such as powers or roots, is presented. The results of the experiments to which the proposal was subjected show its ability to provide an estimation of the RMS value of voltage with sufficient precision or an event alarm in less time than the options analyzed. The validation tests and functional comparison of the prototype which were carried out support its viability.

Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems

The development in distributed energy resources technology has led to a significant amount of non-linear power electronics converters to be integrated in the power system. Although this leads to a more sustainable system, it also can have adverse impacts on system stability and energy power quality. More importantly, the majority of the distribution power systems currently are unbalanced (with asymmetrical voltages) due to load unbalance, while the most common fault types are unbalanced grid faults that can have many adverse effects on distributed resource operations. In that regard, proper control of the grid connected converters in active unbalanced distribution systems will become very important. This paper aims to present the behavior of the advanced grid connected converter control technique under different voltage states at the point of common coupling (according to the ABC classification). The main insufficiencies of the classical control technique will be highlighted, while the paper will propose an appropriate solution for mitigation of negative sequence currents under asymmetrical voltages at the point of common coupling. An extensive experimental verification of the proposed techniques is performed using an advanced laboratory prototype for research in grid integration of distributed resources. The experimental verification clearly demonstrates the benefits offered by the advanced control strategy.

Unified power quality conditioner based on a three-level NPC inverter using fuzzy control techniques for all voltage disturbances compensation

This paper presents a novel and efficient control scheme for unified power quality conditioner (UPQC) based on three-level neutral point clamped (NPC) inverter using fuzzy logic techniques. The proposed UPQC is capable of mitigating source current harmonics and compensate all voltage disturbances such as voltage sags, swells, unbalances and harmonics. It is designed by the integration of series and shunt active filters (AFs) sharing a common DC bus capacitor. The DC voltage is maintained constant using proportional integral voltage controller. The synchronous reference frame (SRF) theory is used to get the reference signals for shunt active power filters (APFs) and the power reactive theory (p-q theory) for series APFs. The shunt and series APF reference signals derived from the control algorithm and sensed signals are injected in two controllers to generate switching signals. To improve the UPQC capability, fuzzy logic techniques are introduced to control the series APF. The performances of the proposed UPQC system are evaluated in terms of power factor correction, mitigation of voltage or current harmonics and all other voltage disturbances compensation using Matlab-Simulink software and SimPowerSystem toolbox. The simulation results illustrate the performance of the proposed UPQC at the common connection point of the nonlinear load to improve the power energy quality.

Inter-Harmonics Analysis Based on the STFT Applied to the Power System

This paper introduces a method of analyzing the time-frequency characteristics for inter-harmonics by Short Time Fourier Transform (STFT). Compared with the traditional arithmetic, the STFT can acquire more precise results and provides theoretical base for inter-harmonic detection. The STFT is used to analyze the inter-harmonics by selecting proper window slides function in Matlab which can acquire more precise resolution for the time-frequency characteristics. This method is useful to eliminate the inter-harmonics in power system. So the quality of power energy can be further improved.

Study on the Harmonics of Switching Power Supply

In order to improve the electric energy quality of switching power supply, through the theoretical analysis on the high frequency large-power rectification and the reverse switch supply theory, we conclude that the switch supply is the main polluting source of affecting the power energy quality. At the same time, we obtain that the contents of 3, 5, 7th-fold harmonic components in the switching supply is highest through the measurement of special harmonics test instrument. Other high-frequency harmonics also exist, but their proportions are rather low, as can be neglected. Therefore, the 3, 5, 7th-fold harmonic components of the switching supply are the major reasons leading to the system polluted. In order to eliminating the pollution of the harmonics produced by the switching supply to power grid and the side-effect to its own control system, this paper designs a general 3-phase passive filter instrument which can not only restrict harmonics, but also improve the power factor of the supply system. The test shows that the method can make the supply system to ideal effect, the contents of all kinds of harmonics become rather lower than the standard constituted by our country, and it also degrades the power harmonics and decreases the alternating current ripples greatly.