System steady-state analysis of a low-voltage microgrid with various distributed energy resources

2010 ◽  
Author(s):  
Wei-Tzer Huang ◽  
Wen-Chih Yang
Keyword(s):  
Steady State ◽  
Low Voltage ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Steady State Analysis ◽  
State Analysis

scholarly journals Voltage Estimation in Low-Voltage Distribution Grids with Distributed Energy Resources

2021 ◽  
pp. 1-1
Author(s):  
Marija Markovic ◽  
Amirhossein Sajadi ◽  
Anthony Florita ◽  
Robert Cruickshank III ◽  
Bri-Mathias Hodge
Keyword(s):  
Low Voltage ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Voltage Distribution ◽  
Distributed Energy ◽  
Distribution Grids

scholarly journals A Horizon Optimization Control Framework for the Coordinated Operation of Multiple Distributed Energy Resources in Low Voltage Distribution Networks

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1182 ◽  
Author(s):  
Konstantinos Kotsalos ◽  
Ismael Miranda ◽  
Nuno Silva ◽  
Helder Leite
Keyword(s):  
Optimal Power Flow ◽  
Low Voltage ◽  
Distribution Networks ◽  
Heat Pumps ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distribution Grid ◽  
Distributed Energy ◽  
Control Framework ◽  
Optimization Control

In recent years, the installation of residential Distributed Energy Resources (DER) that produce (mainly rooftop photovoltaics usually bundled with battery system) or consume (electric heat pumps, controllable loads, electric vehicles) electric power is continuously increasing in Low Voltage (LV) distribution networks. Several technical challenges may arise through the massive integration of DER, which have to be addressed by the distribution grid operator. However, DER can provide certain degree of flexibility to the operation of distribution grids, which is generally performed with temporal shifting of energy to be consumed or injected. This work advances a horizon optimization control framework which aims to efficiently schedule the LV network’s operation in day-ahead scale coordinating multiple DER. The main objectives of the proposed control is to ensure secure LV grid operation in the sense of admissible voltage bounds and rated loading conditions for the secondary transformer. The proposed methodology leans on a multi-period three-phase Optimal Power Flow (OPF) addressed as a nonlinear optimization problem. The resulting horizon control scheme is validated within an LV distribution network through multiple case scenarios with high microgeneration and electric vehicle integration providing admissible voltage limits and avoiding unnecessary active power curtailments.

scholarly journals Harmony Search Algorithm Based Management of Distributed Energy Resources and Storage Systems in Microgrids

2020 ◽  
Vol 10 (9) ◽  
pp. 3252 ◽  
Author(s):  
Oğuzhan Ceylan ◽  
Mustafa Erdem Sezgin ◽  
Murat Göl ◽  
Maurizio Verga ◽  
Riccardo Lazzari ◽  
...  
Keyword(s):  
Low Voltage ◽  
Search Algorithm ◽  
Renewable Energy Sources ◽  
Harmony Search ◽  
Energy Resources ◽  
Test Facility ◽  
Distributed Energy Resources ◽  
Optimization Approach ◽  
Distributed Energy ◽  
Islanded Operation

Microgrids are composed of distributed energy resources (DERs), storage devices, electric vehicles, flexible loads and so on. They may either operate connected to the main electricity grid (on-grid operation) or separated from the grid (islanded operation). The outputs of the renewable energy sources may fluctuate and thus can cause deviations in the voltage magnitudes especially at islanded mode. This may affect the stability of the microgrids. This paper proposes an optimization model to efficiently manage controllable devices in microgrids aiming to minimize the voltage deviations both in on-grid and islanded operation modes. RSE Distributed Energy Resources Test Facility (DER-TF), which is a low voltage microgrid system in Italy, is used to verify the algorithm. The test system’s data is taken through an online software system (REDIS) and a harmony search based optimization algorithm is applied to control the device parameters. The experimental results show that the harmony search based optimization approach successfully finds the control parameters, and can help the system to obtain a better voltage profile.

Improving Power Quality in Low-Voltage Networks Containing Distributed Energy Resources

2013 ◽  
Vol 14 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Sumit Mazumder ◽  
Arindam Ghosh ◽  
Firuz Zare
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Power Distribution System ◽  
Computer Simulation Studies ◽  
Excess Power

Abstract Severe power quality problems can arise when a large number of single-phase distributed energy resources (DERs) are connected to a low-voltage power distribution system. Due to the random location and size of DERs, it may so happen that a particular phase generates excess power than its load demand. In such an event, the excess power will be fed back to the distribution substation and will eventually find its way to the transmission network, causing undesirable voltage–current unbalance. As a solution to this problem, the article proposes the use of a distribution static compensator (DSTATCOM), which regulates voltage at the point of common coupling (PCC), thereby ensuring balanced current flow from and to the distribution substation. Additionally, this device can also support the distribution network in the absence of the utility connection, making the distribution system work as a microgrid. The proposals are validated through extensive digital computer simulation studies using PSCADTM.

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