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Power Flow Analysis of Longitudinal Electrical Power System Incorporating Generalized Unified Power Flow Controller (GUPFC)
Adepoju Gafari Abiola,
Akangbe Samson Ayorinde,
Oni Joe Oladosu
Issue:
Volume 5, Issue 6, November 2016
Pages:
59-66
Received:
22 July 2016
Accepted:
2 August 2016
Published:
18 October 2016
DOI:
10.11648/j.epes.20160506.11
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Abstract: Generalized Unified Power Flow Controller (GUPFC) is a voltage source converter (VSC) based Flexible AC Transmission System (FACTS) controller for shunt and series compensation among the multiline transmission systems of a substation. This research presents the result of the power flow analysis of Nigerian power system incorporating GUPFC modeled in rectangular form to control active and reactive power in transmission lines and reduce the system active power loss without violation of the bus voltage profile. The steady state modeling of GUPFC combined with power system network equations were solved using Newton-Raphson solution method. A MATLAB based program for steady state power flow analysis was developed to solve the resulting equation using Newton-Raphson method. The result of the power flow analysis of Nigerian transmission system indicates disproportionate power flow and high power losses. Application of GUPFC resulted in enhancing active power flow control, reduced system losses and improvement of the system voltage profile.
Abstract: Generalized Unified Power Flow Controller (GUPFC) is a voltage source converter (VSC) based Flexible AC Transmission System (FACTS) controller for shunt and series compensation among the multiline transmission systems of a substation. This research presents the result of the power flow analysis of Nigerian power system incorporating GUPFC modeled i...
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Technique of Optimal Placement of SVC for Voltage Collapse Mitigation
Md. Khurram Monir Rabby,
Abdul Hasib Chowdhury
Issue:
Volume 5, Issue 6, November 2016
Pages:
67-75
Received:
21 October 2016
Accepted:
29 October 2016
Published:
23 November 2016
DOI:
10.11648/j.epes.20160506.12
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Abstract: Every transmission system has voltage stability limit which may lead to voltage collapse if an undetected bulk transmission network is operated close to its operating limit. This research work uses continuation power flow method to identify voltage collapse point for Bangladesh Power System Network (BPSN). For the identification of weak buses, an analytical based technique of tangent factor has been presented. The risk of voltage collapse has been mitigated by placing SVCs at the weak buses of the system using load flow analysis. Moreover, sensitivity based approach has been introduced to determine optimal location of Static VAR Compensator (SVC) for the voltage security enhancement. A comparative analysis has been documented considering the size of reactive power to improve the loading factor of the overall network at the end of this work.
Abstract: Every transmission system has voltage stability limit which may lead to voltage collapse if an undetected bulk transmission network is operated close to its operating limit. This research work uses continuation power flow method to identify voltage collapse point for Bangladesh Power System Network (BPSN). For the identification of weak buses, an a...
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Power System Distortions Mitigation Using Switched Filter Compensator
Sahar Gamaa,
Abdelazeem Abdelsalam,
Almoataz Abdelaziz
Issue:
Volume 5, Issue 6, November 2016
Pages:
76-80
Received:
14 November 2016
Accepted:
26 November 2016
Published:
4 January 2017
DOI:
10.11648/j.epes.20160506.13
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Abstract: This paper proposes a novel low-cost switched power filter compensator (SFC). This proposed SFC is considered as a new topology of distribution FACTS. The proposed SFC scheme is based on a switching on/off process for connecting /disconnecting double tuned arm filters intermittently with two parallel capacitor-banks. The parallel capacitor-banks are connected at the two sides of series capacitor bank. When the switch is on, the SFC works as a double tuned filter while when the switch is off, the SFC works as series/shunt compensator. The switching process is controlled by a pulsing signal generated from PWM circuit. The modulation control signal of PWM is generated from a multi-loop traditional control. The Matlab Simulink environment is used to validate the ability of SFC to mitigate power quality problems, stabilize the system voltage and enhance the system power factor. The results show that the effectiveness of SFC to solve the system quality problems. This novel topology might be extended to be used with renewable energy resources interconnection and microgrids performance applications.
Abstract: This paper proposes a novel low-cost switched power filter compensator (SFC). This proposed SFC is considered as a new topology of distribution FACTS. The proposed SFC scheme is based on a switching on/off process for connecting /disconnecting double tuned arm filters intermittently with two parallel capacitor-banks. The parallel capacitor-banks ar...
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Probabilistic Voltage Stability Analysis Based on Unscented Transformation and Maximum Entropy Principle
Zhang Jianfen,
Tse Chitong,
Liu Yi,
Wang Kewen
Issue:
Volume 5, Issue 6, November 2016
Pages:
81-90
Received:
11 November 2016
Accepted:
28 November 2016
Published:
6 January 2017
DOI:
10.11648/j.epes.20160506.14
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Abstract: Considering the uncertainty of load and the random variation of wind farm output power in power system, a probabilistic voltage stability analysis method is proposed based on unscented transformation technique. According to the statistical characteristics of random variables in power system, the statistical characteristics of voltage stability margins, such as mean, standard deviation and moments, can be calculated by using a small number of samples and the conventional method. The maximum entropy method is applied to determine the probability distribution of voltage stability margin. In compared with Monte Carlo method, the effectiveness of the proposed method is verified on 39-bus and IEEE 57-bus system. The results show that the proposed method can accurately compute the statistical characteristics and the probability distribution of the voltage stability margin, and the computational efficiency is improved.
Abstract: Considering the uncertainty of load and the random variation of wind farm output power in power system, a probabilistic voltage stability analysis method is proposed based on unscented transformation technique. According to the statistical characteristics of random variables in power system, the statistical characteristics of voltage stability marg...
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Design and Modelling of Hybrid PV-Micro Hydro Power Generation Case Study Jimma Zone
Getnet Zewde Somano,
Getachew Shunki
Issue:
Volume 5, Issue 6, November 2016
Pages:
91-98
Received:
31 October 2016
Accepted:
26 November 2016
Published:
10 January 2017
DOI:
10.11648/j.epes.20160506.15
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Abstract: Renewable energy technologies offer clean abundant energy gathered from self-renewing resources such as the sun, micro hydro, etc. Nowadays, due to the ever increasing demand of electricity, renewable energies are becoming the best option for electrification especially for remote area and to meet relatively small load. The standard empirical formula, the collected sunshine hour data have been changed to solar radiation. The results obtained in the proposed work based on empirical formulas were compared with expand these words NASA and SWERA data. The selected area has 5.13kWh/m2/d amount of annual average solar radiation, which shows the area is rich of solar energy. Primary river flow data had been taken for modeling the existing micro-hydro power at MenkoToli River in Ethiopia. The river has an annual average flow rate of 1.131m2/s. HOMER software had been used for modeling optimized result of the hybrid power generation system. 500 households are considered under studied with a total annual consumption of 31,911 kWh per year. The study included the electrical load of primary school and clinic. From the HOMER software optimization result, 10KW PV, 14KW hydro, 14KW converter and 32 battery string had been selected as an optimized option for electrifying MenkoToli in Ethiopia., with an initial capital cost $55,200, total net present cost of $76,128 and unit cost of $0.045. In the study all combinations of hybrid sources for the HOMER software have been observed for cost effective design.
Abstract: Renewable energy technologies offer clean abundant energy gathered from self-renewing resources such as the sun, micro hydro, etc. Nowadays, due to the ever increasing demand of electricity, renewable energies are becoming the best option for electrification especially for remote area and to meet relatively small load. The standard empirical formul...
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Feasibility Analysis of Solar-Biomass Based Standalone Hybrid System for Remote Area
Priyanka Anand,
Sarbjeet Kaur Bath,
Mohammad Rizwan
Issue:
Volume 5, Issue 6, November 2016
Pages:
99-108
Received:
1 December 2016
Accepted:
21 December 2016
Published:
10 January 2017
DOI:
10.11648/j.epes.20160506.16
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Abstract: In India, around 70% of the population is living in remote areas and is not able to get proper electricity from utility grid. Around 20% of the total population has no access of electricity at all, which is not commendable for any developing country like India. Most of the electricity requirement is fulfilled by diesel generator only which is not a feasible solution because of fuel cost, greenhouse gas emission etc. Therefore, there is a need of an alternative solution for power generation in such remote areas. In view of the above, the feasibility analysis of renewable energy based hybrid system has been carried out for a remote area of district Sonipat, Haryana, India. In this study, major renewable energy sources including solar, wind, biomass and small hydro are considered to perform the feasibility analysis. A standalone hybrid model based on solar-biomass is found the feasible and viable option. The cost of power generated from proposed hybrid model is $ 0.086 per unit and is almost free from greenhouse gas emission which is at par in cost with the conventional supply and better in terms of clean production. Such hybrid systems can be very useful for electrification of other similar remote areas.
Abstract: In India, around 70% of the population is living in remote areas and is not able to get proper electricity from utility grid. Around 20% of the total population has no access of electricity at all, which is not commendable for any developing country like India. Most of the electricity requirement is fulfilled by diesel generator only which is not a...
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