Voltage regulation in the medium voltage distribution grid in the presence of renewable energy sources

2019 ◽  
Vol 13 ◽  
pp. 739-745
Author(s):  
M. Dib ◽  
M. Ramzi ◽  
A. Nejmi
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Voltage Regulation ◽  
Energy Sources ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Medium Voltage

scholarly journals Ancillary Services Offered by Distributed Renewable Energy Sources at the Distribution Grid Level: An Attempt at Proper Definition and Quantification

2020 ◽  
Vol 10 (20) ◽  
pp. 7106
Author(s):  
Charis S. Demoulias ◽  
Kyriaki-Nefeli D. Malamaki ◽  
Spyros Gkavanoudis ◽  
Juan Manuel Mauricio ◽  
Georgios C. Kryonidis ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power Plants ◽  
Business Models ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Voltage Regulation ◽  
Ancillary Services ◽  
Energy Sources ◽  
Distribution Grid ◽  
Support Functions

The gradual displacement of synchronous generators driven by conventional power plants, due to the increasing penetration of distributed renewable energy sources (DRES) in distribution grids, is creating a shortage of crucial ancillary services (AS) which are vital for the frequency and voltage stability of the grid. These AS, and some new ones, could now be offered by the DRES, particularly those that are converter interfaced, in a coordinated way in order to preserve the grid stability and resilience. Although recent standards and grid codes specify that the DRES exhibit some system support functions, there are no specifications on how to measure and quantify (M & Q) them both at DRES level and in aggregated form. The M & Q of AS is crucial, since it would allow the AS to be treated as tradable AS in the current and future AS markets. This paper attempts to define a number of AS that can be offered by converter-interfaced DRES and suggests methods for their M & Q. The new AS addressed are: (1) inertial response; (2) primary frequency response; (3) active power smoothing (ramp-rate limitation); (4) exchange of reactive power for voltage regulation; (5) fault-ride-through (FRT) and contribution to fault clearing; (6) voltage harmonic mitigation. Additionally, a rough estimation of the additional investment and operational cost, as well as the financial benefits associated with each AS is provided in order to form the basis for the development of business models around each AS in the near future.

scholarly journals A Study on the V2G Technology Incorporation in a DC Nanogrid and on the Provision of Voltage Regulation to the Power Grid

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2655
Author(s):  
Ioannis Skouros ◽  
Athanasios Karlis
Keyword(s):  
Renewable Energy ◽  
High Efficiency ◽  
Reactive Power ◽  
Power Grid ◽  
Renewable Energy Sources ◽  
Voltage Regulation ◽  
Energy Sources ◽  
Distribution Grid ◽  
Energy Storage Devices ◽  
The Impact

Currently, environmental and climate change issues raise a lot of concerns related to conventional vehicles and renewable energy generation methods. Thus, more and more researchers around the world focus on the development and deployment of Renewable Energy Sources (RES). Additionally, due to the technological advancements in power electronics and electrical batteries, Electrical Vehicles (EVs) are becoming more and more popular. In addition, according to the Vehicle-to-Grid (V2G) operation, the EV batteries can provide electrical energy to the power grid. In this way, many ancillary services can be provided. A Direct Current (DC) nanogrid can be composed by combining the aforementioned technologies. Nanogrids present high efficiency and provide a simple interaction with renewable energy sources and energy storage devices. Firstly, the present study describes the design considerations of a DC nanogrid as well as the control strategies that have to be applied in order to make the V2G operation feasible. Furthermore, the provision of voltage regulation toward the power grid is investigated though the bidirectional transfer of active and reactive power between the DC nanogrid and the power grid. Afterwards, the voltage regulation techniques are applied in an Alternating Current (AC) radial distribution grid are investigated. The proposed system is simulated in Matlab/Simulink software and though the simulation scenarios the impact of the voltage regulation provided by the DC nanogrid is investigated.

scholarly journals Voltage regulation and minimization of loses in the presence of renewable energy sources on the medium voltage network

2020 ◽  
Vol 9 (1) ◽  
pp. 202
Author(s):  
M. Dib ◽  
A. Nejmi ◽  
M. Ramzi ◽  
M. Elhafyani
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Voltage Regulation ◽  
Energy Sources ◽  
Optimization Approach ◽  
Transmission Network ◽  
Medium Voltage ◽  
Electricity Network

The Moroccan electricity network has been designed and sized to work with high power outputs connected to the transmission network. This it delivers a unidirectional power flow from production to consumption. In this configuration, the electricity network carries electricity from production plants mainly connected to the transmission network to customers through the distribution network. Therefore, voltage-setting devices on the distribution network such as load-adjustable power transformers and medium voltage MV capacitor banks are set and operated. The inclusion of the Decentralized Generation (DG) based on renewable energies can induce a reversal of the power flow on the distribution network. This raises problems of voltage regulation in the presence of renewable energy sources. This article shows the limit of the current voltage regulation deployed solutions and exposes a solution for adjusting the voltage on the distribution grid in the presence of renewable energy sources connected to medium voltage MV. We will apply ETAP software to a real network located in the eastern zone for the conducted investigation. Later, an optimization approach aiming to minimize losses and improve the voltage plan will be presented at the end.  

scholarly journals Progresses in Analytical Design of Distribution Grids and Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4270
Author(s):  
Gianpiero Colangelo ◽  
Gianluigi Spirto ◽  
Marco Milanese ◽  
Arturo de Risi
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
State Of The Art ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Distribution Grid ◽  
Mathematical Methods ◽  
Power Generators ◽  
Bidirectional Power Flow ◽  
Distribution Grids

In the last years, a change in the power generation paradigm has been promoted by the increasing use of renewable energy sources combined with the need to reduce CO2 emissions. Small and distributed power generators are preferred to the classical centralized and sizeable ones. Accordingly, this fact led to a new way to think and design distributions grids. One of the challenges is to handle bidirectional power flow at the distribution substations transformer from and to the national transportation grid. The aim of this paper is to review and analyze the different mathematical methods to design the architecture of a distribution grid and the state of the art of the technologies used to produce and eventually store or convert, in different energy carriers, electricity produced by renewable energy sources, coping with the aleatory of these sources.

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