scholarly journals Maximization of Distribution Network Hosting Capacity through Optimal Grid Reconfiguration and Distributed Generation Capacity Allocation/Control

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5315
Author(s):  
Rade Čađenović ◽  
Damir Jakus
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Capacity Allocation ◽  
Operating Conditions ◽  
Small Scale ◽  
Grid Connection ◽  
Second Order Cone ◽  
Generation Capacity ◽  
Negative Impacts ◽  
And Control

High penetration of small-scale distributed energy sources into the distribution network increase negative impacts related to power quality causing adverse conditions. This paper presents a mathematical model that maximizes distribution network hosting capacity through optimal distributed generation capacity allocation and control and grid reconfiguration. In addition to this, the model includes on-load tap changer control for stabilization of grid voltage conditions primarily in grid operating conditions related to voltage rise problems, which can limit grid hosting capacity. Moreover, the objective function allows the possibility of energy transfer between distribution and transmission grids. The proposed model considers alternative grid connection points for distributed generation and determines optimal connection points as well as install capacity while considering network operating limits. The model is cast as a multiperiod second-order cone linear program and involves aspects of active power management. The model is tested on a modified IEEE 33 bus test network.

Optimal placement of distributed generation based on DISCO’s additional benefit using self adaptive levy flight based black widow optimization

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Naga Lakshmi Gubbala Venkata ◽  
Jaya Laxmi Askani ◽  
Venkataramana Veeramsetty
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Additional Benefit ◽  
Operating Conditions ◽  
Optimal Placement ◽  
Lévy Flight ◽  
Black Widow ◽  
Levy Flight ◽  
Simulation Performance ◽  
Self Adaptive

Abstract Optimal placement of Distributed Generation (DG) is a crucial challenge for Distribution Companies (DISCO’s) to run the distribution network in good operating conditions. Optimal positioning of DG units is an optimization issue where maximization of DISCO’s additional benefit due to the installation of DG units in the network is considered to be an objective function. In this article, the self adaptive levy flight based black widow optimization algorithm is used as an optimization strategy to find the optimum position and size of the DG units. The proposed algorithm is implemented in the IEEE 15 and PG & E 69 bus management systems in the MATLAB environment. Based on the simulation performance, it has been found that with the correct location and size of the DG modules, the distribution network can be run with maximum DISCO’s additional benefit.

Protection of Active Distribution Systems with DGs

2015 ◽  
Vol 16 (5) ◽  
pp. 399-411 ◽  
Author(s):  
Abdelrahman Ahmed Akila ◽  
Ahmed Helal ◽  
Hussein Eldesouki
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Distribution Systems ◽  
Distribution Network ◽  
Single Source ◽  
Passive Systems ◽  
Coordination Problem ◽  
Distributed Generators ◽  
Fault Currents ◽  
Negative Impacts

Abstract Distribution systems are traditionally designed as radial passive systems fed from a single source. Protection coordination of such systems has been easily established assuming the system radiality. Insertion of distributed generators (DGs) into distribution systems makes the distribution system to be more active which causes redistribution of fault currents magnitudes and directions. This causes negative impacts on the original protection system coordination, since the distribution system losses its radiality and passiveness. Recently protection coordination in the presence of distributed generation has been paid a great attention. Researchers proposed various solutions to solve the protection coordination problem caused by adding DG into the distribution network. In this paper, the proposed solutions for the protection coordination problem considering the DG insertion will be illustrated, classified, and criticized.

Design and operating experiences of municipal MBRs in Europe

2008 ◽  
Vol 58 (12) ◽  
pp. 2319-2327 ◽  
Author(s):  
H. Itokawa ◽  
C. Thiemig ◽  
J. Pinnekamp
Keyword(s):  
Membrane Bioreactor ◽  
Membrane Damage ◽  
Full Scale ◽  
Operating Conditions ◽  
Small Scale ◽  
Membrane Unit ◽  
Effluent Quality ◽  
Membrane Flux ◽  
The Moment ◽  
And Control

The number of membrane bioreactor (MBR) installations is increasing worldwide, not only for small-scale industrial WWTPs but also for larger-scale municipal WWTPs. In Europe, MBR has been installed in municipal WWTPs since late 1990s, and more than 100 full-scale plants are operated at the moment. In this paper, present state of European municipal MBRs is described in terms of design and operating conditions, as well as operating problems and their solutions, based on the information collected from 17 full-scale WWTPs by interview and questionnaire survey. Decisive factors of MBR installation at these plants were footprint and effluent quality. Full-aerobic and pre-denitrification were the most common reactor configurations, nearly half of them being equipped with independent filtration tanks. Operating conditions of bioreactor and filtration, including membrane flux and cleaning strategy, were different from plant to plant, as a result of plant-specific optimization experiences, even among the similar type of membrane. Operating problems specific for MBR were reported, including blocking/failure of pre-screen, sludging/hair-clogging of membrane, damage on membrane unit, air in permeate pipes, as well as conventional troubles including occurrence of scum and initial trouble in instrumentation and control systems. Aspects for further optimization of MBR design were also pointed out by the operators.

scholarly journals Evaluation of 20 kV Distribution Network Losses In Radial Distribution Systems Due to Distributed Generation Penetration

2021 ◽  
Vol 2129 (1) ◽  
pp. 012085
Author(s):  
H Arnawan ◽  
I Muzamir ◽  
I Y Mohd ◽  
R A R Siti ◽  
S Hadi
Keyword(s):  
Distributed Generation ◽  
Power Flow ◽  
Distribution Systems ◽  
Reactive Power ◽  
Negative Impact ◽  
Distribution Network ◽  
Before And After ◽  
Generation Capacity ◽  
Network Losses ◽  
Increasing Demand

Abstract The installation of distributed generation with renewable energy becomes a solution when the demand for electricity is increasing and electricity generation with fossil energy is increasingly limited. There has been a change in power flow before and after the installation of distributed generation. However there can be a negative impact on the distribution network losses applicable to reactive power flows. There are cases where the distributed generation capacity is greater than the supplied load, resulting in distributed generation operating as a system voltage regulator and requiring reactive power, so that DG will absorb the reactive power from the system. The increasing demand for reactive power in DG also causes an increase in the current flowing in the network, and causes an increase in losses in the network, especially for the losses in reactive power.

scholarly journals Optimal Placement and Sizing of Distributed Generation in Distribution System using Analytical Method

2019 ◽  
Vol 8 (4) ◽  
pp. 6357-6363
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Power Loss ◽  
Distribution Network ◽  
Optimal Placement ◽  
Small Scale ◽  
Voltage Profile ◽  
Distribution Grid ◽  
Step Size ◽  
System Power

The reliability of distribution network can be improved with the penetration of small scale distributed generation (DG) unit to the distribution grid. Nevertheless, the location and sizing of the DG in the distribution network have always become a topic of debate. This problem arises as different capacity of DG at various location can affect the performance of the entire system. The main objective of this study is to recommend a suitable size of DG to be placed at the most appropriate location for better voltage profile and minimum power loss. Therefore, this paper presents an analytical approach with a fixed DG step size of 500 kW up to 4500 kW DG to analyses the effect of a single P-type DG in IEEE 33 bus system with consideration of system power loss and voltage profile. Four scenarios have been selected for discussions where Scenario 1: 3500 kW DG placed at node 3; Scenario 2: 2500 kW DG placed at node 6; Scenario 3: 1000 kW DG placed at node 18 and Scenario 4: 3000 kW DG placed at node 7. Results show that all the four scenarios are able to reduce the power loss and improve the voltage profile however Scenario 4 has better performance where it complies with minimum voltage requirement and minimizing the system power loss.

An intelligent protection scheme to mitigate the impact of integrating large share wind energy resources in a weak distribution network

2017 ◽  
Vol 41 (6) ◽  
pp. 383-396 ◽  
Author(s):  
Naser El Naily ◽  
Saad M Saad ◽  
Zakariya Rajab ◽  
Faisal Mohamed
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Operating Conditions ◽  
Protection System ◽  
System Stability ◽  
Protection Scheme ◽  
System Protection ◽  
Renewable Distributed Generation ◽  
Medium Level ◽  
The Impact

Although integration of wind distributed generation directly into the distribution level has considerable advantages, increased penetration of wind distributed generation (renewable distributed generation) alters the network configuration and jeopardizes the protection system operation and system stability; for this reason, necessary changes in power system protection philosophy must be achieved. Modern numerical relays offer extraordinary features and fast and accurate methods for spotting and detecting different unbalanced operating conditions and can be used to mitigate the influence of integrating wind distributed generation into distribution network. In this study, an adaptive directional negative protective scheme was implemented in the medium-level distribution network to investigate and evaluate the performance of protection system and introduce new adaptive protective scheme based on negative overcurrent protection to increase the selectivity and sensitivity of the protection system in case of unbalanced faulty conditions. The medium-level distribution network of Libya Eastern electric network had been implemented in ETAP software to address and evaluate the efficiency of the proposed approach.

Study on the Optimal Allocation Method of Distributed Generation Capacity

2012 ◽  
Vol 516-517 ◽  
pp. 1443-1447
Author(s):  
Rui Xiang Fan ◽  
Hong Xia Xiao ◽  
Hong Chen
Keyword(s):  
Distributed Generation ◽  
Capacity Planning ◽  
Power Flow ◽  
Optimal Allocation ◽  
Supply Voltage ◽  
Distribution Network ◽  
Capacity Allocation ◽  
Flow Diagram ◽  
Constraint Condition ◽  
Optimal Node

In distribution network, there are multiple constraint condition on the capacity allocation of distributed generation, this text takes the maximization of power generation benefit as the premise, and adopts genetic algorithm to implement the optimal allocation of distributed generation’s capacity. The algorithm uses the minimum distribution network power consumption as objective function, the admissible deviation of supply voltage and capacity accessed to common point not more than 10MVA are taken as the constraint condition, and the Newton-Raphson method is adopted to carry out power flow calculation. Based on the algorithm, the specific planning program flow diagram is given, and combining Jiangxi Gongqing city distribution case, capacity planning design is carried out to conclude the optimal node access capacity. The conclusion of the study can play a better guiding role for the planning and design of distribution network including distributed generation.

scholarly journals Reliability factor in the design of a distribution network

2021 ◽  
Vol 22 (6) ◽  
pp. 43-54
Author(s):  
F. L. Byk ◽  
Yu. V. Kakosha ◽  
L. S. Myshkina
Keyword(s):  
Power Systems ◽  
Distributed Generation ◽  
Power Supply ◽  
Distribution Network ◽  
Operating Conditions ◽  
Design Stage ◽  
Local Power ◽  
Reliability Factor ◽  
Residential Neighborhood ◽  
Predicted Values

Decision-making at the design stage of the distribution network significantly affects the change in the indices of uninterrupted power supply to consumers. The main ones are SAIDI and SAIFI. There is no methodological support for determining the predicted values of the power supply continuity indices. The purpose of the study is to develop a methodology for calculating the predicted values of indicators of uninterrupted supply during design. A feature of the technique is the account of the circuit-mode changes in the 0.4-10 kV distribution network section. The introduction of the developed methodology into project practice is relevant and expedient. An important point is the accounting of distributed generation, which has a significant impact on the operating conditions of power supply systems. Local power systems based on distribution generation and networks 0,4-10 kv are becoming widespread, which can serve as the basis for distributed energy and energy transition in Russia. Their appearance increases the efficiency of the energy sector, including increasing the power supply reliability. However, difficulties arise in justifying distributed generation power distribution schemes, the feasibility of measures to create local power systems and the effectiveness of their integration without appropriate research and methodological support. The developed methodology is based on the use of statistical processing methods, expert systems, the SAIDI method. It is aimed at medium and low voltage distribution networks. The methodology makes it possible to compare measures taking into account changes in the structural and functional reliability of the distribution network and regime restrictions. Verification of the methodology was carried out on the example of a section of the distribution network of a residential neighborhood. Comparison of the results obtained by the methodology and in the software ETAP, proved the adequacy of the proposed methodology and the reliability of the predicted values obtained SAIDI and SAIFI.

Sign in / Sign up

Export Citation Format

Share Document