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Power Quality Issues and Solutions in Renewable Energy Systems
Published in L. Ashok Kumar, S. Albert Alexander, Computational Paradigm Techniques for Enhancing Electric Power Quality, 2018
L. Ashok Kumar, S. Albert Alexander
Any power problem manifested in voltage, current, or frequency deviations that result in failure or misoperation of customer equipment is termed as power quality. The issue of electric power quality is gaining importance because of several reasons. Some of them are: (1) Modern society is becoming increasingly dependent on the electrical supply. A small power outage has a great economic impact on the industrial consumers; (2) the advent of new power electronic equipment; (3) the deregulated environment, which reduces the maintenance and investments into the power system and hence reduces the margins in the system; and (4) emerging distributed power generation. The key problems associated with the power quality are: damage to sensitive equipment, interference, malfunction, extra losses, personnel safety issues, poor utilization, and poor power factor.
Three-Phase Power Flow and Harmonic Analysis
Published in Antonio Gómez-Expósito, Antonio J. Conejo, Claudio A. Cañizares, Electric Energy Systems, 2018
Wilsun Xu, Julio García-Mayordomo
The proliferation of power quality-sensitive loads in recent years has made power quality one of the major concerns for utility companies, manufacturers, and customers. Power quality refers to the characteristics of the power supply required to make electrical equipment work properly. Two of the important power quality issues are the imbalance of three-phase voltages and the distortion of sinusoidal voltage waveforms in the form of harmonics. In recent years, considerable efforts have been made to improve the management of power quality in power systems. The area of power quality analysis, especially that of three-phase and harmonic power flow algorithms, has experienced significant development. Well-accepted component models, solution techniques, and analysis procedures have been established. TPLF study and network harmonic analysis are becoming an important component of power system analysis and design.
Three-Phase Power Flow and Harmonic Analysis
Published in Antonio Gómez-Expósito, Antonio J. Conejo, Claudio Cañizares, Electric Energy Systems, 2017
Wilsun Xu, Julio García-Mayordomo
The proliferation of power quality-sensitive loads in recent years has made power quality one of the major concerns for utility companies, manufacturers, and customers. Power quality refers to the characteristics of the power supply required to make electrical equipment work properly. Two of the important power quality issues are the imbalance of three-phase voltages and the distortion of sinusoidal voltage waveforms in the form of harmonics. In recent years, considerable efforts have been made to improve the management of power quality in power systems. The area of power quality analysis, especially that of three-phase and harmonic power flow algorithms, has experienced significant development. Well-accepted component models, solution techniques, and analysis procedures have been established. Three-phase power flow study and network harmonic analysis are becoming an important component of power system analysis and design.
A novel hybrid Chi-Mo optimisation algorithm-based PV-fed STATCOM for performance improvement of power distribution system
Published in International Journal of Ambient Energy, 2022
Suraj Deelip Pawar, Diwakar R. Joshi, Rutuja L. Patil
The connection between solar PV to the grid results in an effect on the power quality of the distribution system. The major factors influencing power quality problems are harmonics, voltage flickers, frequency imbalances, slow change voltage variations, rapid voltage changes, and voltage collapses. One of the essential factors which create noticeable issues in integration with solar PV systems is voltage fluctuations. The said issue is minimised by using an optimised PV-STATCOM control scheme and enhancing the voltage profile, and obtaining compensation in reactive power. A 100 KW grid-connected PV-STATCOM is simulated in a MATLAB Simulink environment by setting temperature 30°C and irradiance is 1000 W/m2. The finest optimised gains of PI-controller settings and through comparisons of outcomes achieved with and without optimisation are the key highlights of this study.
A Critical Review on Hybrid-Topologies, Modulation Techniques, and Controlling Approaches of Modular Multilevel Converter for Grid Integration
Published in IETE Journal of Research, 2022
Raghu Vamsi Krishna Challa, Suresh Mikkili, Praveen Kumar Bonthagorla
When applied to three-phase power networks, this can cause large voltage variations and imbalance. Power quality issues can be resolved by either upgrading the power source or installing mitigation circuits. In Figure 14: (a), we see the MMC in a variety of configurations for specific uses. Figure 14 depicts the MMC-based DC automobile. Figure 14:(f) depicts the 3-port DC-to-AC-to-DC converter with MMCs. The DC Auto, depicted in and Figure 14:(d), might have been a less risky option to disrupt the ultra-high voltage three-port. Frequencies used by train power systems (ac catenary) are not always compatible with those used by residential and business areas (often 50 or 60 hertz). Additional requirements for train interties (static frequency converters) include reactive compensation, high reliability, superior efficiency, and minimal maintenance. High abrupt over voltages, huge harmonic currents, and overloads are all potential threats to the reliability of rail ac power, which must be mitigated. Direct MMC, from 1-phase to 3-phase ac (ac-ac) Figure 14: (g), and indirect MMC, from ac to dc to ac Figure 14: (h) Mono-polar cells have been utilized in indirect MMCs, while bipolar cells have been employed in direct MMCs. Since the SM capacitors may cancel out the effects of 1-phase power variations, these topologies don't require a bulky second harmonic LC filter.
Least Mean Fourth Theory-based Dynamic Voltage Restorer for the Mitigation of Voltage Sag and Harmonics
Published in IETE Journal of Research, 2022
Shubhendra Pratap Singh, Anupam Kumar, Arun Rathore
For the smooth operation of load centers for various consumers, the first basic requirement is clean and reliable power. Various power quality issues lead to unreliable and distorted power [1] supply from generating stations. Various voltage and current disturbances, such as sag, swell, harmonics, interruption, poor power factor, fluctuations, etc. are collectively called power quality problems. Power quality issues generally occur at the point of common coupling (PCC) where the voltage/current sensitive loads are connected [2]. For the mitigation of power quality issues various custom power devices, such as Dynamic Voltage Restorer (DVR), Unified Power Quality Conditioner (UPQC), etc. were earlier studied. Devices, plants, and microgrids [3,4] (chemical plants, computer loads, financial transaction systems) prone to voltage-related power quality issues are protected with the help of a DVR. A DVR is located between the voltage-sensitive load (to be protected) and the source side containing distortions. For providing adequate compensation for disturbances various compensation techniques had been reported in the literature [5]. A very prominent point of discussion is that the topology of DVR and the rating of switching devices used in DVR are governed by the compensation techniques adopted for the DVR.