scholarly journals The behaviour of a low voltage distribution network with crescent presence of photovoltaic generation and energy storage elements

2021 ◽  
Vol 19 ◽  
pp. 423-428
Author(s):  
Rafael Martins Leite ◽  
◽  
Jonas Villela de Souza ◽  
Eduardo Nobuhiro Asada ◽  
Mário Oleskovicz
Keyword(s):  
Energy Storage ◽  
Power Quality ◽  
Low Voltage ◽  
Voltage Drop ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Energy Storage Devices ◽  
Photovoltaic Generation ◽  
Electricity Grid ◽  
Voltage Unbalance

This paper aims to examine the increasing integration of distributed energy resources in the low voltage distribution grid. Considering the current increasing of distributed photovoltaic generation in Brazil, there is a deterioration of specific indices related to power quality, such as overvoltage and voltage unbalance. In this sense, a survey of these problems, the severity assessment via simulation of a real system and the proposal of improvement in the associated indexes using energy storage devices are made. The resulting analyses contemplate both the current reality of growth in the distributed photovoltaic generation and the joint integration of these generators with energy storage systems, thus enabling a comparison of results focusing on the electricity grid impacts. The study has improved the network's operation, reducing the power quality aggravating factors and increasing the local consumption of the energy generated locally. The total losses on the original network were reduced by up to 52.6%, the voltage drop to 74.7% and the voltage rise was completely eliminated.

Impact of Utilizing PV Surplus Electricity on CO2 Emissions From the Residential Energy Systems

2017 ◽  
Author(s):  
Toshiyuki Nagai ◽  
Akira Yoshida ◽  
Yoshiharu Amano
Keyword(s):  
Co2 Emissions ◽  
Low Voltage ◽  
Energy Systems ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Residential Energy ◽  
Energy Storage Devices ◽  
Water Heater ◽  
Storage Devices ◽  
Residential Sector

In order to reduce CO2 emissions in the residential sector, the installation of photovoltaics (PV) has been increasing extensively. However, such large-scale PV installations cause problems in the low-voltage distribution grid of the residential sector, such as PV related voltage surges. In this study, the utilization of suppressed PV output through energy storage devices was proposed. Using demand side energy storage devices reduces voltage surge, transmission loss, and CO2 emissions from the residential buildings. The objective of this study was to add voltage constraints of the low-voltage distribution grid to an operational planning problem that we developed for the residential energy systems, and to quantitatively evaluate the potential of heat pump water heater (HP) to utilize the PV surplus electricity, while considering the electrical grid constraints based on the minimization of CO2 emissions. We found that when a 4.5 kW HP with 370 L storage, which utilizes PV output, was added to the system, the reduction in CO2 emissions was more than twice compared with that in the case of adding 4 kWh battery (BT) to a PV and gas fired water heater configuration. Further, the effect of utilizing the suppressed PV electricity by HP was almost equivalent to that by the BT. Therefore, the potential of HP in utilizing PV surplus electricity is higher than that of the BT in terms of CO2 emissions reduction in the residential sector.

Investigation of Voltage Unbalance Profile in Low Voltage Electrical Distribution Network with Normal Mode Operation Using MATLAB

2018 ◽  
Vol 35 ◽  
pp. 60-76 ◽  
Author(s):  
Patrick Taiwo Ogunboyo ◽  
Remy Tiako ◽  
Innocent E. Davidson
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Voltage Drop ◽  
Distribution Network ◽  
Voltage Profile ◽  
Voltage Unbalance ◽  
Voltage Quality ◽  
Distribution Line ◽  
Electrical Distribution Network ◽  
Statutory Limit

With ever increasing use of semiconductor devices and information technology (ICT) equipment in the industry, homes and offices, power quality is gaining attention to both industry and the electric utility. Power voltage quality cause huge economic losses to businesses all over the world. It is estimated to cost industry and commerce about €100 billion per annum in European Union, since voltage quality problem is one of the major power quality disturbances. This paper presents an investigative a study of the 11/0.4 kV, low voltage electrical distribution network and analyzes voltage unbalance. It recommends an effective method of improving the voltage profile and reducing the voltage unbalance to acceptable standard. The network was modelled using distribution network standard parameters for low voltage distribution network using MATLAB/Simulink sim power system tool box. The simulation results show that the percentage voltage unbalance, correct voltage profile and minimum voltage drop of 0.5 km distribution feeder line is of standard acceptable statutory limit, hence the distribution line operates at optimum performance. However, it is also established that the voltage profile for distribution network feeder lengths of 0.8 km to 5 km for balanced and unbalanced distribution lines from the beginning to the customer terminal of the distribution lengths are less than the acceptable allowable limit of – 5 %, of the nominal voltage value, hence voltages are inadmissible for customers use. Moreso, the percentage voltage unbalance, voltage profile and voltage drop on 0.8 km to 5 km distribution feeder line are all less than standard acceptable statutory limit, hence the distribution line operates below optimum performance. It was established that mitigating these problems require the electricity distribution company to install an effective voltage boosting devices along the network lengths in order provide admissible, permissible and normalize end users standard acceptable voltage.

Reduction of the Low Voltage Substation Constraints by Inserting Photovoltaic Systems in Underserved Areas

2019 ◽  
Vol 12 (2) ◽  
pp. 105-112
Author(s):  
Benbouza Naima ◽  
Benfarhi Louiza ◽  
Azoui Boubekeur
Keyword(s):  
Low Voltage ◽  
Voltage Drop ◽  
Electrical Energy ◽  
Utilization Rate ◽  
Photovoltaic Systems ◽  
Voltage Distribution ◽  
Medium Voltage ◽  
Pv Systems ◽  
Transformer Substation ◽  
Load Pattern

Background: The improvement of the voltage in power lines and the respect of the low voltage distribution transformer substations constraints (Transformer utilization rate and Voltage drop) are possible by several means: reinforcement of conductor sections, installation of new MV / LV substations (Medium Voltage (MV), Low Voltage (LV)), etc. Methods: Connection of mini-photovoltaic systems (PV) to the network, or to consumers in underserved areas, is a well-adopted solution to solve the problem of voltage drop and lighten the substation transformer, and at the same time provide clean electrical energy. PV systems can therefore contribute to this solution since they produce energy at the deficit site. Results: This paper presents the improvement of transformer substation constraints, supplying an end of low voltage electrical line, by inserting photovoltaic systems at underserved subscribers. Conclusion: This study is applied to a typical load pattern, specified to the consumers region.

Assessment of power quality parameters and indicators at the point of common coupling in a low voltage power grid with photovoltaic generation emulated

2022 ◽  
Vol 203 ◽  
pp. 107679
Author(s):  
Oscar Pinzón-Quintero ◽  
Daniel Gaviria-Ospina ◽  
Alejandro Parrado-Duque ◽  
Rusber Rodríguez-Velásquez ◽  
German Osma-Pinto
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Power Grid ◽  
Quality Parameters ◽  
Photovoltaic Generation ◽  
Point Of Common Coupling ◽  
Common Coupling
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