scholarly journals A New and Efficient Nonlinear Solver for Load Flow Problems

2020 ◽  
Vol 10 (3) ◽  
pp. 5851-5856
Author(s):  
A. H. Khoso ◽  
M. M. Shaikh ◽  
A. A. Hashmani
Keyword(s):  
Power Systems ◽  
Electric Power Systems ◽  
Load Flow ◽  
Significant Issue ◽  
Order Accuracy ◽  
Flow Problems ◽  
Nonlinear Solver ◽  
Nonlinear Solvers ◽  
Simulation Results ◽  
Number Of Iterations

Load Flow (LF) analysis is a fundamental and significant issue in electric power systems. Because of the nonlinearity of the power mismatch equations, the accuracy of the nonlinear solvers is important. In this study, a novel and efficient nonlinear solver is proposed with active applications to LF problems. The formulation of the Proposed Method (PM) and its workflow and mathematical modeling for its application in LF problems have been discussed. The performance of the PM has been validated on the IEEE 14-bus and 30-bus test systems against several existing methods. The simulation results show that the PM exhibits higher order accuracy, faster convergence characteristics, smaller number of iterations, and lesser computation times in comparison with the other benchmark methods.

Research of Compensated AC Regulated Power Supply in Electric Power Systems Based on a High-Frequency Isolated Transformer

2013 ◽  
Vol 676 ◽  
pp. 227-230
Author(s):  
Qi Liang Zhang ◽  
Ping Wang ◽  
Liu Yang
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Power Supply ◽  
High Frequency ◽  
Output Voltage ◽  
Closed Loop ◽  
Electric Power Systems ◽  
Slow Response ◽  
Voltage Fluctuation ◽  
Simulation Results

In this paper, a new topology of compensated AC regulated power supply (ACRPS) in electric power systems based on a high-frequency isolated transformer (HFIT) is proposed. In order to overcome the slow response and low accuracy of the existing ACRPS, the phase shift regulating control (PSRC) based on instantaneous value of voltage single closed loop is applied as well as the software phase locked loop (SPLL). The proposed ACRPS has been simulated in the case of the voltage fluctuation, harmonics and frequency shift with Matlab. The simulation results show that output voltage precision is controlled within 0.5% and total harmonic distribution (THD) can be limited to less than 1%. In a word, the feasibility of the proposed ACRPS is effectively verified.

A method to find multisolutions of load flow in electric power systems

1983 ◽  
Vol 103 (5) ◽  
pp. 71-80
Author(s):  
Katsuyuki Ishihara ◽  
Ken-Ichi Nishiya ◽  
Jun Hasegawa ◽  
Hajime Fujiwara
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Electric Power Systems ◽  
Load Flow

A Fault Phase Selection Method Based on Arc Voltages for High-Voltage Line Protections in Electric Power Systems

2013 ◽  
Vol 676 ◽  
pp. 218-221
Author(s):  
Xiao Hui Zeng ◽  
Yong Hui Chen ◽  
Gong Quan Tan
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
High Voltage ◽  
Single Phase ◽  
Electric Power Systems ◽  
Selection Method ◽  
Phase Selection ◽  
Arc Voltage ◽  
Sequence Components ◽  
Simulation Results

A fault phase selection method is proposed based on arc voltage after analysis of inadequate of fault phase selector existed in the paper. A precise fault phase selection can be achieved by using arc voltages in conjunction with phase current differences and sequence components of currents. The method proposed can solve false tripping problems in transmission line protections when single phase to ground faults occur with great reliabilities. Simulation results show that the method can identify faulted phase or phases correctly and effectively.

Asynchronous Method for Frequency Regulation by Dispersed Plug-in Electric Vehicles

2018 ◽  
Vol 19 (3) ◽  
Author(s):  
Yonghong Kuang ◽  
Canbing Li ◽  
Bin Zhou ◽  
Yijia Cao ◽  
Hanyu Yang ◽  
...  
Keyword(s):  
Power Systems ◽  
Electric Vehicles ◽  
Electric Power Systems ◽  
Frequency Regulation ◽  
Vehicle To Grid ◽  
Electrical Vehicles ◽  
Asynchronous Method ◽  
Control Centre ◽  
Electrical Vehicle ◽  
Simulation Results

Abstract:Plug-in electrical vehicles (PEVs) can participate in frequency regulation (FR) in electric power systems under the framework of vehicle-to-grid (V2G) technology. With a growing number of electrical vehicles (EVs), a greater number of distributed electrical vehicle (EV) chargers may change charge or discharge power simultaneously to participate in FR, resulting in over response. In this paper, considering the over-response and equality issues, an asynchronous method for dispersed PEVs participation in FR is proposed. PEVs participate in FR with the same set of parameters. Over-response can be avoided during the process of FR. Equality enables the dispersed PEVs to participate in FR with the same probability. The presented method empowers PEVs to actively participate in FR without a control centre or a communication network. Simulation results demonstrate the validity of the presented method in different operational scenarios.

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