Island Configuration for Service Restoration of the Smart Distribution System

2013 ◽  
Vol 325-326 ◽  
pp. 586-589
Author(s):  
Xu Dong Wang ◽  
Wei Liang
Keyword(s):  
Distributed Generation ◽  
Knapsack Problem ◽  
Power Supply ◽  
Distribution System ◽  
Operation Mode ◽  
Total Power ◽  
Power Balance ◽  
Service Restoration ◽  
Configuration Problem

sland operation is a special operation mode for service restoration for the smart distribution system with distributed generation. In this paper, a model of island reconfiguration of the smart distribution system is proposed. The objection of this model is maximizing the total power supply profit. Meanwhile, load priority, controllable and uncontrollable load, and the restrictions of power balance, voltage and equipment capability are all taken into account. The island configuration problem is first simplified as a special knapsack problem, and based on the solution of this knapsack problem an initial island scheme is gained. By feasibility checking and adjusting, a island configuration is finally proposed. The results of the samples demonstrate that the model and method presented in this paper is feasible and valid.

Reliability Analysis of Distribution Network with Integrated Photovoltaic Power Generation

2014 ◽  
Vol 672-674 ◽  
pp. 956-960
Author(s):  
Ke Huang ◽  
Xin Wang ◽  
Yi Hui Zheng ◽  
Li Xue Li ◽  
Yan Ling Liu
Keyword(s):  
Power Generation ◽  
Power Supply ◽  
Distribution System ◽  
Operation Mode ◽  
Distribution Network ◽  
Photovoltaic Power ◽  
Reliability Calculation ◽  
Set Up ◽  
Pv Generation ◽  
Equivalent Method

To analyze the influence of distribution network with grid-connected photovoltaic (PV) generation on the power supply reliability, in this paper it firstly regards interconnected PV generation as an equivalent generator with rated capacity as well as the island operation mode of PV to set up a model for reliability calculation and analysis. Based on the network equivalent method, the structure of distribution system with PV is simplified and then the reliability indexes of distribution system are worked out based on Failure Mode and Effects Analysis (FMEA). At last, a comparative calculation between the distribution network with incorporated PV generations and that without PV generations is made. After analyzing a real example, the results suggest that integrating PV power generations reasonably into the distribution network can enhance the reliability of whole distribution system.

Modeling and Simulation of Microgrid with Small Hydropower and Wind Generator on Island Operation Mode

2012 ◽  
Vol 614-615 ◽  
pp. 1841-1845
Author(s):  
Yong Wei Zheng ◽  
Min You Chen ◽  
Chuang Li ◽  
Rui Lin Xu ◽  
Xin Xu
Keyword(s):  
Modeling And Simulation ◽  
Distributed Generation ◽  
Power Supply ◽  
Control Strategies ◽  
Operation Mode ◽  
Wind Generation ◽  
Small Hydropower ◽  
Simulation Experiments ◽  
Load Power ◽  
Simulation Results

A microgrid model with distributed generation including small hydropower source and wind generation source is presented in this paper. The corresponding control strategies for this microgrid are developed. Simulation experiments on island operation mode using Matlab/Simulink software program have been conducted. The simulation results show that the microgrid can operate stably and reliably for load power supply.

scholarly journals AACO technique for solving multiobjectives in electrical distribution system

2019 ◽  
Vol 14 (3) ◽  
pp. 1076
Author(s):  
P. Ravi Babu ◽  
Srivani Molughu
Keyword(s):  
Power Supply ◽  
Distribution System ◽  
Reactive Power ◽  
Flow Analysis ◽  
Test System ◽  
Load Flow ◽  
Critical Parameters ◽  
Electrical Distribution ◽  
Ohmic Losses ◽  
Service Restoration

The multi objectives in electrical distribution system are service restoration and minimization of Ohmic losses. These objectives can be achieved by artificial ant colony optimization through reconfiguration. Service restoration is also a major aspect for reliable service. If any fault occurs in the system, faulted zone is isolated from healthy system. This originates discontinuity in power supply. To maintain the continuity in power supply there is a necessity to provide service to these loads from adjacent healthy feeders through reconfiguration without infringement of radiality, load balance and critical parameters. In distribution system Ohmic losses are 30 to 40 percent. In order to minimize these losses, there is a need for reconfiguration of the system and perform the power flow analysis to get bus voltages, branch currents and power losses (i.e. real or Ohmic or copper loss and reactive power loss). A direct load flow analysis is adopted in the proposed work. In this paper four feeder test system used for service restoration and IEEE 33 bus, IEEE 69 bus test systems for minimization of Ohmic losses have been obtained.

scholarly journals Optimal sizing and location of multiple distributed generation for power loss minimization using genetic algorithm

2019 ◽  
Vol 16 (2) ◽  
pp. 956
Author(s):  
Abdulhamid Musa ◽  
Tengku Juhana Tengku Hashim
Keyword(s):  
Genetic Algorithm ◽  
Distributed Generation ◽  
Distribution System ◽  
Power Loss ◽  
Total Power ◽  
Power Losses ◽  
Loss Minimization ◽  
Power Constraints ◽  
Voltage Deviation ◽  
Power Limits

This paper presents a Genetic Algorithm (GA) for optimal location and sizing of multiple distributed generation (DG) for loss minimization. The study is implemented on a 33-bus radial distribution system to optimally allocate different numbers of DGs through the minimization of total active power losses and voltage deviation at power constraints of 0 – 2 MW and 0 – 3 MW respectively. The study proposed a PQ model of DG and Direct Load Flow (DLF) technique that uses Bus Incidence to Branch current (BIBC) and Branch Current to Bus Voltage (BCBV) matrices. The result obtained a minimum base case voltage level of 0.9898 p.u at bus 18 with variations of voltage improvements at other buses after single and multiple DG allocations in the system. Besides, the total power loss before DG allocation is observed as 0.2243 MW, and total power loss after DG allocation was determined based on the power constraints. Various optimal locations were seen depending on the power limits of different DG sizes. The results have shown that the impact of optimal allocation and sizing of three DG is more advantageous concerning voltage improvement, reduction of the voltage deviation and also total power loss in the distribution system. The results obtained in the 0 – 2 MW power limit is consistent to the 0 – 3 MW power limits regarding the influence of allocating DG to the network and minimization of total power losses.

The Service Restoration in the Distribution System with Distributed Generators Based on the Heuristic Multi-Agent Evolutionary Algorithm

2011 ◽  
Vol 354-355 ◽  
pp. 1027-1030
Author(s):  
Li Jun Yang ◽  
Wei Li Wang
Keyword(s):  
Evolutionary Algorithm ◽  
Power Supply ◽  
Distribution System ◽  
Optimization Problem ◽  
Distribution Network ◽  
Multi Objective Optimization ◽  
Distributed Generators ◽  
Service Restoration ◽  
Multi Agent ◽  
Restoration Problem

In view of a large number of distributed generators penetrated into distribution network, an improved hierarchical island operation was proposed to make the DG play the role as backup power supply in the service restoration of the distribution network; As the renewable distributed generators was strongly advocated, A new mathematical model was proposed to make full use of them. The service restoration problem is a constrained multi-objective optimization problem, a new algorithm which was the combination the heuristic algorithm and multi-agent evolutionary algorithm was proposed, it improved the multi-agent evolutionary algorithm with the Niche technologies to ensure the variety of the populations in the post-optimization and used the adaptive updating strategy to improve the convergence speed. The results of a case show feasibility and correctness of the model and the algorithm.

A Comprehensive Review of Fault Location Methods for Distribution Power System

2017 ◽  
Vol 6 (1) ◽  
pp. 185 ◽  
Author(s):  
N Gana ◽  
NF Ab Aziz ◽  
Z Ali ◽  
H Hashim ◽  
Bahisham Yunus
Keyword(s):  
Distributed Generation ◽  
Power Supply ◽  
Field Measurement ◽  
Distribution System ◽  
Fault Location ◽  
Field Measurements ◽  
Maintenance Cost ◽  
Comprehensive Review ◽  
Capacitance Effects ◽  
Location Methods

Fault on distribution system does not only affect the reliability of power supply, but also contribute to increasing operational and maintenance cost borne by the utilities. Throughout the years, various methods have been studied and practiced to solve problems related to the fault location in the distribution system. In this paper, the fault location methods are reviewed and summarised according to their categories. The fault location methods discussed in this paper are based on literature studies of outage mapping and field measurement for the distribution system. Furthermore, the component which influences the fault location methods such as unbalanced system, capacitance effects, distributed generation, and distribution topology are related to the explanation of the method. Finally, the field measurements are presented as in comparison which will clarify the effectiveness and the establishment of each method.

An Engineering Service Restoration Method after a 35kV Substation Outage

2014 ◽  
Vol 701-702 ◽  
pp. 1148-1152
Author(s):  
Jun Qian ◽  
Zhen Ping Yan ◽  
Qi Wei Qiu ◽  
Mei Wang ◽  
Jia Qing Zhou ◽  
...  
Keyword(s):  
Power System ◽  
Shortest Path ◽  
Power Supply ◽  
Distribution System ◽  
Shortest Path Algorithm ◽  
Real Distribution ◽  
Service Restoration ◽  
Restoration Method ◽  
Restoration Measures ◽  
Poor Stability

The distribution system is at the end of the power system and is directly connected to the energy consumers, which makes the distribution network a vital part of the power system. When a substation suffers an outage, electricity service restoration measures must be taken as soon as possible to reduce the loss. Traditional restoration methods have disadvantages such as poor stability and bad convergence. This paper proposed an approach to resume the power supply after a 35kV substation outage with the help of Dijkstra’s shortest path algorithm. The proposed method is tested on a real distribution system. The result shows that the method is effective to solve the problem of electricity service restoration.

scholarly journals Optimal Siting of Distributed Generation Unit in Power Distribution System considering Voltage Profile and Power Losses

2022 ◽  
Vol 2022 ◽  
pp. 1-14
Author(s):  
Muhammad Aamir Aman ◽  
Xin Cheng Ren ◽  
Wajahat Ullah Khan Tareen ◽  
Muhammad Abbas Khan ◽  
Muhammad Rizwan Anjum ◽  
...  
Keyword(s):  
Power System ◽  
Electric Power ◽  
Distributed Generation ◽  
Power Distribution ◽  
Distribution System ◽  
Total Power ◽  
Test Case ◽  
Voltage Profile ◽  
Power Losses ◽  
Power Distribution System

Many underdeveloped countries are facing acute shortage of electric power and short term measures are important to consider to address the problems of power outage, power plant failures, and disaster areas. Distributed generation (DG) is a promising approach for such cases as it allows quick on-site installation and generation of electric power. Injection of DG can improve the system voltage profile and also reduce the system's total power losses. However, the placement and sizing of the DG unit is an optimization problem in the radial distribution system. As a test case, this study examines voltage profile improvement and system power losses for an 11 KV residential feeder at the Abdul Rehman Baba grid station in Pakistan, which is modelled using the Electrical Transient Analyzer Program (ETAP). For various scenarios, several tests are conducted to assess the effects of DG on the distribution system. The results show that proper design considerations of size and location of a DG, to be inserted in to the system, lead to significant reduction in power losses and improvement in voltage profile and thus improvement in the overall efficiency of the power system. The projections of this work can be used to optimize the expansion of a power system and tackling different issues related to voltage profile in distribution sector worldwide.

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