scholarly journals Ideal Time-Based Voltage Control using Evolutionary Algorithm in Distributed Generator Centered Networks

2021 ◽  
Vol 2 (4) ◽  
pp. 233-238
Author(s):  
Vivekanadam B
Keyword(s):  
Evolutionary Algorithm ◽  
Low Voltage ◽  
Distribution Networks ◽  
The Novel ◽  
Network Decomposition ◽  
Control Plan ◽  
Distributed Generator ◽  
Distributed Generators ◽  
Node Network ◽  
Tap Changer

The distributed generators (DGs) consists of radial rural distribution networks that makes use of off-voltage tap changing transformers. Ideal tap changer positions for these transformers can be determined using the novel estimation technique proposed in this paper. A branchy low-voltage network is brought down to its equivalent line along with the utilization of spatial network decomposition in this technique. Evolutionary algorithm is used for determining the PV nodes ideal voltage module values in ideal seasonal control plan. A PQ node with 3 DGs incorporated in a radial 40-node network and a PQ node with 10 DGs are incorporated in a radial 33-node network are the distribution networks used for modelling the proposed system.

scholarly journals Optimal Seasonal Voltage Control in Rural Distribution Networks with Distributed Generators

2010 ◽  
Vol 61 (6) ◽  
pp. 321-331 ◽  
Author(s):  
Jordan Radosavljević ◽  
Miroljub Jevtić ◽  
Dardan Klimenta
Keyword(s):  
Genetic Algorithm ◽  
Voltage Control ◽  
Distribution Networks ◽  
Spatial Network ◽  
Network Decomposition ◽  
Control Plan ◽  
Distributed Generators ◽  
Real Distribution ◽  
Node Network ◽  
Tap Changer

Optimal Seasonal Voltage Control in Rural Distribution Networks with Distributed Generators This paper proposes a procedure for determining the optimal tap changer positions of off-voltage tap changing transformers in radial rural distribution networks in presence of distributed generators (DGs). The procedure is based on spatial network decomposition and as well as bringing down a branchy LV network to an equivalent line. Optimal voltage module values of PV nodes in the optimal seasonal control plan are determined by the application of a genetic algorithm. The proposed procedure is examined in two real distribution networks: a radial 33-node network with 11 DGs modelled as PQ nodes and a radial 40-node network with three DGs in total, two of which are modelled as PV nodes and one modelled as a PQ node.

scholarly journals Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2173
Author(s):  
Álvaro Rodríguez del Nozal ◽  
Esther Romero-Ramos ◽  
Ángel Luis Trigo-García
Keyword(s):  
Distributed Generation ◽  
Optimization Problem ◽  
Low Voltage ◽  
Optimal Solution ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Rigorous Approach ◽  
Tap Changer ◽  
Load Tap Changer ◽  
Active Distribution Networks

Voltage control in active distribution networks must adapt to the unbalanced nature of most of these systems, and this requirement becomes even more apparent at low voltage levels. The use of transformers with on-load tap changers is gaining popularity, and those that allow different tap positions for each of the three phases of the transformer are the most promising. This work tackles the exact approach to the voltage optimization problem of active low-voltage networks when transformers with on-load tap changers are available. A very rigorous approach to the electrical model of all the involved components is used, and common approaches proposed in the literature are avoided. The main aim of the paper is twofold: to demonstrate the importance of being very rigorous in the electrical modeling of all the components to operate in a secure and effective way and to show the greater effectiveness of the decoupled on-load tap changer over the usual on-load tap changer in the voltage regulation problem. A low-voltage benchmark network under different load and distributed generation scenarios is tested with the proposed exact optimal solution to demonstrate its feasibility.

scholarly journals Application of Frequency Response Analysis Technique to Detect Transformer Tap Changer Faults

2021 ◽  
Vol 11 (7) ◽  
pp. 3128
Author(s):  
Salem Mgammal Al-Ameri ◽  
Abdulaziz Almutairi ◽  
Muhammad Saufi Kamarudin ◽  
Mohd Fairouz Mohd Yousof ◽  
Ahmed Abu-Siada ◽  
...  
Keyword(s):  
Frequency Response ◽  
Low Voltage ◽  
Experimental Testing ◽  
Equivalent Circuit Model ◽  
Distribution Networks ◽  
Diagnostic Tools ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Electrical Transmission ◽  
Tap Changer

Power transformers are located in the electrical transmission and distribution networks where different voltage levels are needed. The turn ratio of the low voltage and high voltage windings is mechanically controlled by an on-load tap changer or de-energized tap changer. As the tap changer is the transformer’s only moving part, it is highly susceptible to mechanical failure and aging degradation. While some diagnostic tools have been used to determine the mechanical condition of tap changer contacts, not much attention was given to use the frequency response analysis to diagnose the transformer’s tap changers’ mechanical integrity. This paper is taking one step forward into maturing the application of the frequency response analysis (FRA) technique to detect transformer tap changer faults. In this regard, two common tap changer faults are created, and experimental testing for four FRA test configurations is conducted. For a better understanding of the tap changer fault mechanism, an electrical equivalent circuit model is proposed and designed using Simulink. The simulation and implementation of the equivalent circuits using MATLAB\R2018a.

scholarly journals Comparison of the Location and Rating of Energy Storage for Renewables Integration in Residential Low Voltage Networks with Overvoltage Constraints

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2041 ◽  
Author(s):  
Andrew F. Crossland ◽  
Darren Jones ◽  
Neal S. Wade ◽  
Sara L. Walker
Keyword(s):  
Energy Storage ◽  
Low Voltage ◽  
Distribution Networks ◽  
Network Operator ◽  
Mitigation Measure ◽  
Work Location ◽  
Distributed Generators ◽  
Large Numbers ◽  
Pv Generation ◽  
The Impact

Expansion of photovoltaic (PV) generation is increasing the challenge for network operators to keep voltages within operational limits. Voltage rise occurs in low voltage (LV) networks when distributed generators export, particularly at times of low demand. However, there is little work quantifying the scale of voltage issues and subsequently potential solutions across large numbers of real networks. In this paper, a method is presented to analyse a large quantity of geographically and topographically varying distribution networks. The impact of PV on voltages in 9163 real LV distribution networks is then quantified. One potential mitigation measure is increased network demand to reduce voltages. In this work, location algorithms are used to identify where increased demand, through energy storage, has the greatest effect on overvoltage. The study explores the impact on overvoltage of two modes of storage installation reflecting differing routes to adoption: purchase of storage by homeowners and purchase by network operators. These scenarios are compared with traditional re-conductoring in the 9163 networks. It is shown that to avoid violation of absolute voltage limits, storage should be installed at strategically important locations. Storage in homes reduces overvoltage, offering clear benefits to the network operator, but very wide deployment is required to completely remove the need for reinforcement.

A Relay Scheme for Distribution Networks Considering the Control Mode of Inverter-Based Distributed Generator

2013 ◽  
Vol 805-806 ◽  
pp. 801-804
Author(s):  
Yan Xia Zhang ◽  
Yan Li
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Current Source ◽  
Distribution Networks ◽  
Control Mode ◽  
Equivalent Model ◽  
Positive Sequence ◽  
Distributed Generator ◽  
Protection Scheme ◽  
Distributed Generators

In the distribution system including distributed generators, it is difficult to meet the requirements of selectivity and sensitivity for traditional current protection. Currently, inverter-based distributed generators (IBDG) are widely used in distribution systems. The transient process of IBDG is rapid, and its transient characteristics are influenced by the control strategy. The controlled current source equivalent model of IBDG with positive-sequence P-Q control is put forward. After analyzing the fault characteristics, the protection scheme using negative sequence current is proposed, which can be used in the distribution systems including IBDG under positive-sequence P-Q control. The simulation results on a 10kV distribution system have verified the correctness of faults characteristics and the effectiveness of protection scheme.

Economic Dispatch of the Microgrid with Electric Vehicles

2012 ◽  
Vol 614-615 ◽  
pp. 1876-1880
Author(s):  
Zan Yang ◽  
You Bing Zhang ◽  
Su Fen Tong ◽  
Guo Qing Weng
Keyword(s):  
Particle Swarm Optimization ◽  
Power System ◽  
Electric Vehicles ◽  
Low Voltage ◽  
Economic Dispatch ◽  
Distribution Networks ◽  
Voltage Distribution ◽  
Swarm Optimization ◽  
Storage Devices ◽  
Distributed Generators

Microgrids (MGs), which can operate either interconnected or isolated from the bulk grid as one controlled entity, are low voltage distribution networks comprising various distributed generators (DGs), storage devices and loads. This paper proposes a particle swarm optimization (PSO) method for solving the economic dispatch (ED) problem of a MG power system. Vehicles plugged into the MG can be used as mobile storage devices, which supply power to the MG system when the load is in the peak. The experimental results show that the plug-in electric vehicles (EVs) can improve the economic of the MG system.

Dynamic Improvement of Distributed Generators Connected To Distribution Networks Using DSTATCOM

2012 ◽  
Vol 5 (3) ◽  
pp. 16-22
Author(s):  
P. Harshavardhan Reddy ◽  
◽  
J.N. Chandra Sekhar ◽  
M. Padma Lalitha ◽  
◽  
...  
Keyword(s):  
Distribution Networks ◽  
Distributed Generators
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