Improve Power Stability Research Articles

Improving Power Quality Using D-STATCOM with Capacitor as Energy Storage System

Power electronics are used more frequently to raise awareness of power quality which must be considered when designing modern power systems for effective operation and continuous power supply to various load centers. Otherwise, it will be hazardous for residential and commercial customers, reducing the production of their work due to faults and equipment damage. Electronic technology known as Flexible AC Transmission System (FACTS) may improve power stability to make the electric power system efficient. Oscillation damping in the Power system is still a big concern for operating a safe and dependable power system. The static synchronous compressor (STATCOM) is connected to assist power networks with poor power quality and voltage regulation. Although there are several uses, voltage stability is the most frequently used. An average model of the D-STATCOM control approach is presented in this work to improve the transmission of power quality flow and voltage stability in electric power systems. An increase in system voltage stability, reactive power flow control for different loads, and dynamic response of STATCOM are the primary goals of this research work.

Optimized robust control for improving frequency response of delay dependent AC microgrid with uncertainties

Converter-interface-based renewable energy incorporated into modern power systems causes deterioration in power system stability and it is proving to be a main challenge for operators using sluggish traditional generation with a growing share of converter-interface generation, and there is a need for an alternative means to deliver rapid frequency control. This paper proposes two control loops as secondary frequency control, first is an improved optimized delay-dependent frequency control to ensure robust frequency control under daily changes in system parameters that may occur in prospective, renewable-rich future AC microgrids. For a variety of operating conditions, the design process employs a mixed H2/H∞ robust control based on linear matrix inequality (LMI). In second, a speedy-acting improved power stability control loop is utilized as the proposed secondary frequency control, because demand response aggregators can be beneficial for frequency control. Robustness is evaluated against several perturbations and communication delay attacks through dynamic simulation and stability is evaluated by small-signal analysis. Different case studies subject to generation\\load loss, multiple time delay and parameter uncertainties are demonstrated on an interconnected AC microgrid system to verify the performance of the proposed control technique.

A multi objective feeder optimization model for Improved Power Stability Performance in Grid Networks

A multi objective feeder optimization model for Improved Power Stability Performance in Grid Networks

Real time Electric Pattern Based Voltage Regulation Model for Improved Power Stability

Real time Electric Pattern Based Voltage Regulation Model for Improved Power Stability

Digitalizing Nigerian University Learning System: How Ready Are the Students?

The Nigerian higher education has been plugged into a huge gap between the demand for higher education and the shortage in supply as a result of its inability to absorb the increasing number of students which has been exasperated by the persisted industrial actions by the university lecturers, insecurity, associated effects of post Covid 19 pandemic, among others, thereby hindering access to the teeming population of admission seeking individuals to universities. To this end, the study investigated the online readiness of students towards digitalization of university learning system with 333 out of 2000 undergraduate students in public universities. Three research questions guided while Students’ Readiness for Online University Learning Scale (SROULS) instrument was developed for this study. The results indicate high level of readiness of students towards digitalization of university learning with overall mean of the construct at 3.73. Also, the percentage level of online readiness of female student insignificantly differs from the male students. Challenges affecting digitization of university learning system were identified. Therefore, it recommended legalization of online university system and provision of enabling environment for its successful implementation in Nigerian education; improved power stability, internet connectivity among others.

Modelling of Electrical Spring for Voltage, Power Factor Correction and Improving Power Stability

Modelling of Electrical Spring for Voltage, Power Factor Correction and Improving Power Stability

Improving Power Stability of Energy Harvesting Devices With Edge Computing-Assisted Time Fair Energy Allocation

Due to the time-varying characteristics of energy harvesting sources, it is a challenge for energy harvesting to provide stable energy output. In this article, the time fair energy allocation (TFEA) problem is investigated, and an utility maximization framework is proposed to guarantee both time fairness and energy efficiency of energy allocation. Then we propose a prediction based energy allocation scheme. First, a deep learning predictor is used to predict the harvested energy. Second, we transform the TFEA problem into an Euclidean shortest path problem and propose a fast time fair energy allocation algorithm (FTF) based on inflection points search. Our algorithm can significantly decrease the iteration number of the shortest path search and reduce the computation time. In addition, we propose an edge computing assisted energy allocation framework, in which the computing tasks are offloaded to edge gateways. The proposed scheme is evaluated in the scenario of metro vehicles health monitoring. Experiment results show that the time consumption of FTF is at least 92.2% lower than traditional algorithms, while the time fairness of FTF is the best. The total time cost and energy cost of our edge computing scheme is also competitive compared with traditional local computing schemes.

A Case Study on Self Healing of Smart Grid With Islanding and Inverter Volt–VAR Function

Increased variability, and uncertainty getting induced in the power system with the growing penetration of renewable resources necessitates the need for power flow stability studies, analysis, and contingency responses to address various operational concerns. Utilization of Volt–VAR (VV) functions of inverters to mitigate voltage violations have been introduced in recent grid integration standards. All the new grid connected nonsynchronous generators are expected to provide a composite power delivery at continuous rated output power as well as they should participate in dynamic reactive power injection while maintaining the power factor within an acceptable range. The present case study is based on a voltage instability incident which led to partial blackout in state grid, which is also identified as one of the root causes of power system blackouts worldwide. The state power grid case study has been simulated using real-time power grid data collected from PMUs/SCADA system for all 400 and 220 kV nodes. The location for integrating solar PV renewable energy in state grid is identified using an analytical methodology, by deriving an evaluation index represented as improved power stability index. An approach for employing VV functionality of inverter based grid connected solar photovoltaic system, as a solution to address the voltage instability issue that occurred in the conventional grid, is elaborated. The article also illustrates islanding using generator coherency identification.

Transient Stability Improvement on Jos – Gombe 330kV Line Using Static Var Compensator

In this paper, the result of a study carried out to determine the impact of static VAr compensator on voltage profiles and reactive power flow in the Nigerian 330kV transmission grid network is presented. The research seeks to mitigate the challenge of high reactive power on Jos – Gombe 330kV single circuit transmission line. The high reactive power is produced in that axis as a result of low industrial demand in the North-Eastern region of Nigeria which results in low-inductive loading of the long transmission line that spans from Jos to Gombe and its extension to Yola, Damaturu and Maiduguri. The study also performed optimal placement of the static VAr compensator in the area where it can influence the voltage at the static VAr compensator device connection point by controlling the reactive power flow through the grid. This was accomplished by modeling the existing 330kV Nigerian network in DIgSILENT PowerFactory. The result is an improved power stability on the line between Jos and Gombe. The voltage tolerance with the approved Nigerian Grid Code and compliance was ensured. Also, the static VAr compensator was proposed over reactors due to the fact that it is dynamically switched.

Stable and High-Efficiency Wireless Power Transfer System for Robotic Capsule Using a Modified Helmholtz Coil

Magnetic resonance-based wireless power transfer system offers a promising solution to overcome power limitations typically encountered by capsule endoscopy. Despite of much attention in this area, aspects such as power stability and power transfer efficiency remain suboptimal and therefore investigation for further improvement is still required. This paper presents a method to improve power stability as well as power transfer efficiency for wireless capsule endoscopy. A new power transmission coil capable of producing uniform magnetic field is proposed to improve power stability through uniform field that at the same time minimizes the unnecessary peak electromagnetic exposure. To improve power transfer efficiency, a mixed resonance scheme is employed. Our experimental results show improvement over existing methods where the proposed system attained power stability of 94.62% and power transfer efficiency of 4.9% under worst position of the receiving coil. Furthermore, the proposed transmitting coil provides additional advantage, where it minimized the unnecessary peak electromagnetic exposure by 26% as compared to the conventional Helmholtz coil-based system. We believe the proposed system will open new direction for future wireless capsule endoscopy and can also be useful in other industrial applications.

A Study for Control Power System Load Flow by Shield Control of High-TC Superconducting Cable

Objectives: HTS cable was shown high temperature characteristic of the superconducting tape by sharp increase resistance on fault state. This paper proposes by controlling the HTS shield part to stable transmission in power system. Methods/Statistical Analysis: HTS cable was divided mainly three parts that was former, conductor, and shield part. To be performance the HTS cable designed by comparison low error value with real HTS cable property and, developed by controlling shield parts by using mutual inductance change. Findings: The HTS power cable was controlled load flow by adjusting the shield part. Improved the HTS cable was limited current above 64% better than HTS cable in installed the fault current limiter. Therefore, HTS cable could be improved power stability in the power system. Improvements/Applications: The HTS shield control might be controlled power flow and limited fault current. It wasn’t necessary for installing other device by controlling HTS cable shield part. So, proposed the HTS cable model was applied in economic and effective device in power system.

Improve Power Stability & Damping Oscillation In Multi Machine System Using (SSSC) with POD controller

Improve Power Stability & Damping Oscillation In Multi Machine System Using (SSSC) with POD controller

Wind Speed Prediction Based on Improved Grey Neural Network Model

Wind speed forecasting is an effective method to improve power stability of wind farm. Grey system theory have certain advantages in the study of poor information and uncertainty problems, it is suitable for the system with limited computing power and data storage capacity, such as wind turbine control system. In order to further improve the prediction accuracy of grey model, we combined GM (1, 1) model and BP neural network prediction model in this paper, and improved the combined model by background value optimizing and introducing genetic algorithm. Through analyzing the simulation results and comparing the forecasting results with the actual wind speed, it is clear that the improved combined prediction model is superior to pure grey forecasting model and it meets the needs of the wind power control.

Numerical model of dual-wavelength erbium-doped fiber ring laser based on gain-equilibrium method

A novel numerical model of the dual-wavelength fiber ring lasers utilizing gain-equilibrium method is presented by developing the two level, homogeneous Giles model. To obtain the simulation method, the gain equilibrium condition is derived and modified to adapt to the iterative procedure in simulations. This condition is confirmed by both the numerical and experimental results, which indicate that the cavity losses of both wavelength channels play important roles in maintaining stable dual-wavelength emitting. The tolerant loss-bias is 0.05 dB in simulations and 0.4 dB in experiments, respectively. The difference between numerical and experimental results reveals that the inhomogeneous linewidth broadening of EDF contributes mostly to the improved power stability, but the loss vibrations play an important role in this effect.

Tunable single- and dual-wavelength erbium-doped fiber laser based on Sagnac filter with a high-birefringence photonic crystal fiber

In this paper, we observed and experimentally investigated a high-performance single- and dual-wavelength erbium-doped fiber ring laser based on a Sagnac filter which contains a section of high-birefringence photonic crystal fiber (HB-PCF) and a polarization controller. Incorporation of the high-birefringence photonic crystal fiber can suppress multimode oscillation, improve power stability and increase the optical signal-to-noise ratio (SNR). Wavelength tunable was achieved by using a polarization controller in the Sagnac filter. Highly stable single-, dual-wavelength oscillations are tunable within a wavelength range from 1550 to 1562 nm and SNR as high as 57 dB with narrow line width about 0.011 nm, is experimentally demonstrated.

An investigation on the improved performance of shared cavity optical parametric oscillators

It has been demonstrated that shared cavity optical parametric oscillator (OPO) could improve power stability in comparison with that of coupled cavity OPO. By theoretically calculating the spectral transmissions induced by the etalon effect, it has been found that the shared cavity OPO had much wider transmission bandwidth than that of coupled OPO. The corresponding experimental results agreed with the theoretical analysis. Furthermore, the OPO and fundamental laser resonator have nearly the same longitudinal mode spacing in the shared cavity configuration. The above two factors can account for the improved performance of the shared OPO operation.

A Wavelength-Tunable Single-Longitudinal-Mode Fiber Ring Laser With a Large Sidemode Suppression and Improved Stability

A high-performance single-longitudinal-mode (SLM) fiber ring laser incorporating a high finesse ring filter that contains a section of weakly pumped erbium-doped fiber is proposed and experimentally demonstrated. The incorporation of the high finesse ring filter can suppress multimode oscillation, improve power stability, and increase sidemode suppression ratio (SMSR). A stable SLM oscillation with a tunable range from 1522 to 1573 nm and an SMSR as high as 68 dB is experimentally demonstrated.