A Power Flow Generating Method for Power System Day-Ahead Operation Schedule Validation

This paper investigates the maximum photovoltaic (PV) penetration limits on both overhead lines and underground cables medium voltage radial distribution system. The maximum PV penetration limit is estimated considering both bus voltage limit (1.05 p.u.) and feeder current ampacity (1 p.u.). All factors affect the max PV penetration limit are investigated in detail. Substation voltage, load percentage, load power factor, and power system frequency (50 Hz or 60 Hz) are analyzed. The maximum PV penetration limit associated with overhead lines is usually higher than the value associated with the underground cables for high substation voltage (substation voltage = 1.05 and 1.04 p.u.). The maximum PV penetration limit decreases dramatically with low load percentage for both feeder types but still the overhead lines accept PV plant higher than the underground cables. Conversely, the maximum PV penetration increases with load power factor decreasing and the overhead lines capability for hosting PV plant remains higher than the capability of the underground cables. This paper proved that the capability of the 60-Hz power system for hosting the PV plant is higher than the capability of 50 Hz power system. MATLAB software has been employed to obtain all results in this paper. The Newton-Raphson iterative method was the used method to solve the power flow of the investigated systems.

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A Solution of Optimal Power Flow Problem in Power System Based on Multi Objective Particle Swarm Algorithm

2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus) ◽

10.1109/elconrus51938.2021.9396117 ◽

2021 ◽

Author(s):

Mamdouh K. Ahmed ◽

Mohamed H. Osman ◽

Ahmed A. Shehata ◽

Nikolay V. Korovkin

Keyword(s):

Power System ◽

Power Flow ◽

Optimal Power Flow ◽

Flow Problem ◽

Particle Swarm ◽

Particle Swarm Algorithm ◽

Multi Objective ◽

Optimal Power ◽

Swarm Algorithm ◽

Power Flow Problem

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Online Steady-State Security Awareness Using Cellular Computation Networks and Fuzzy Techniques

Energies ◽

10.3390/en14010148 ◽

2020 ◽

Vol 14 (1) ◽

pp. 148

Author(s):

Lili Wu ◽

Ganesh K. Venayagamoorthy ◽

Jinfeng Gao

Keyword(s):

Steady State ◽

Power System ◽

Customer Service ◽

Situation Awareness ◽

Power Flow ◽

Load Flow ◽

Security Level ◽

Small Disturbance ◽

State Security ◽

Cellular Computation

Power system steady-state security relates to its robustness under a normal state as well as to withstanding foreseeable contingencies without interruption to customer service. In this study, a novel cellular computation network (CCN) and hierarchical cellular rule-based fuzzy system (HCRFS) based online situation awareness method regarding steady-state security was proposed. A CCN-based two-layer mechanism was applied for voltage and active power flow prediction. HCRFS block was applied after the CCN prediction block to generate the security level of the power system. The security status of the power system was visualized online through a geographic two-dimensional visualization mechanism for voltage magnitude and load flow. In order to test the performance of the proposed method, three types of neural networks were embedded in CCN cells successively to analyze the characteristics of the proposed methodology under white noise simulated small disturbance and single contingency. Results show that the proposed CCN and HCRFS combined situation awareness method could predict the system security of the power system with high accuracy under both small disturbance and contingencies.

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Enhancing Oscillation Damping in an Interconnected Power System with Integrated Wind Farms Using Unified Power Flow Controller

Energies ◽

10.3390/en12020322 ◽

2019 ◽

Vol 12 (2) ◽

pp. 322 ◽

Cited By ~ 10

Author(s):

Ping He ◽

Seyed Arefifar ◽

Congshan Li ◽

Fushuan Wen ◽

Yuqi Ji ◽

...

Keyword(s):

Power Systems ◽

Power System ◽

Time Domain ◽

Power Flow ◽

Unified Power Flow Controller ◽

Time Domain Simulation ◽

Interconnected Power System ◽

Dynamic Time ◽

Oscillation Damping ◽

Power Flow Controller

The well-developed unified power flow controller (UPFC) has demonstrated its capability in providing voltage support and improving power system stability. The objective of this paper is to demonstrate the capability of the UPFC in mitigating oscillations in a wind farm integrated power system by employing eigenvalue analysis and dynamic time-domain simulation approaches. For this purpose, a power oscillation damping controller (PODC) of the UPFC is designed for damping oscillations caused by disturbances in a given interconnected power system, including the change in tie-line power, the changes of wind power outputs, and others. Simulations are carried out for two sample power systems, i.e., a four-machine system and an eight-machine system, for demonstration. Numerous eigenvalue analysis and dynamic time-domain simulation results confirm that the UPFC equipped with the designed PODC can effectively suppress oscillations of power systems under various disturbance scenarios.

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Research on Power Flow Control of UPFC Based on PSASP/UPI

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.385-386.1078 ◽

2013 ◽

Vol 385-386 ◽

pp. 1078-1081 ◽

Cited By ~ 1

Author(s):

Fang Zhang ◽

Jian Ping Chen ◽

Chuan Dong Li ◽

Yan Juan Wu

Keyword(s):

Power System ◽

Flow Control ◽

Power Flow ◽

System Analysis ◽

Unified Power Flow Controller ◽

Power Flow Control ◽

Engineering Research ◽

Good Convergence ◽

Practical Engineering ◽

Bus Voltage

The main objective of power flow control for unified power flow controller (UPFC) is to increase the transmission capacity over the existing transmission corridor or line. This paper presents a practical engineering methodology of embedding the power flow control model of UPFC into the commercial software -- power system analysis software package (PSASP) based on its user program interface (UPI) function. In the proposed methodology, the interface currents of UPFC series side and UPFC shunt side between the UPFC device and the network are used to control the transmission line power flow and UPFC bus voltage, respectively. In UPFC series side, the current of UPFC series branch is calculated from the power target equation of the controlled line. In UPFC shunt side, the shunt reactive current of UPFC is used to control the bus voltage. Simulation results on a practical power system show that the proposed methodology can be efficiently applied to the engineering research and analysis of the real power grid with UPFC with good convergence and only one control parameter needed to be prescribed.

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