scholarly journals DSO Strategies Proposal for the LV Grid of the Future

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6327
Author(s):  
Bartłomiej Mroczek ◽  
Paweł Pijarski
Keyword(s):  
Distribution System ◽  
Renewable Energy Sources ◽  
Power Conversion ◽  
Power Input ◽  
Operating Efficiency ◽  
Management Service ◽  
Strategy Selection ◽  
Volume Management ◽  
Significant Challenge ◽  
System Operator

A significant challenge for the DSO (Distribution System Operator) will be to choose the optimum strategy for flexibility service in the LV area with high RES (renewable energy sources) penetration. To this end, a representative LV grid operated in Poland was selected for analysis. Three research scenarios with RES generation were presented in the range of 1–8 kW for the power factor from 0.9 to 1. The grid PV capacity was determined for four load profiles. Based on this factor, optimum RES volume management service types were determined. Under the flexibility service, the proposed power conversion services and active RES operations for DOS were proposed. The research was conducted using the Matlab and PowerWorld Simulator environment. Optimum active power values were obtained for the RES generation function for single and dual operation systems of the power conversion system. In future, the knowledge in the field of grid capacity will enable the DSO to increase the operating efficiency of the LV grid. It will enable the optimum use of the RES generation maximisation function and proper strategy selection. It will improve the energy efficiency of the power input through the MV/LV node.

scholarly journals Reactive Power Management Considering Stochastic Optimization under the Portuguese Reactive Power Policy Applied to DER in Distribution Networks

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4028 ◽  
Author(s):  
Abreu ◽  
Soares ◽  
Carvalho ◽  
Morais ◽  
Simão ◽  
...  
Keyword(s):  
Power Management ◽  
Distribution System ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Real Data ◽  
Distribution Networks ◽  
System Operator

Challenges in the coordination between the transmission system operator (TSO) and the distribution system operator (DSO) have risen continuously with the integration of distributed energy resources (DER). These technologies have the possibility to provide reactive power support for system operators. Considering the Portuguese reactive power policy as an example of the regulatory framework, this paper proposes a methodology for proactive reactive power management of the DSO using the renewable energy sources (RES) considering forecast uncertainty available in the distribution system. The proposed method applies a stochastic sequential alternative current (AC)-optimal power flow (SOPF) that returns trustworthy solutions for the DSO and optimizes the use of reactive power between the DSO and DER. The method is validated using a 37-bus distribution network considering real data. Results proved that the method improves the reactive power management by taking advantage of the full capabilities of the DER and by reducing the injection of reactive power by the TSO in the distribution network and, therefore, reducing losses.

scholarly journals A Framework for Offering Short-Term Demand-Side Flexibility to a Flexibility Marketplace

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3612
Author(s):  
Stig Ødegaard Ottesen ◽  
Martin Haug ◽  
Heidi S. Nygård
Keyword(s):  
Distribution System ◽  
Renewable Energy Sources ◽  
Demand Side ◽  
Transmission Congestion ◽  
Power Sector ◽  
Short Term ◽  
Local Flexibility ◽  
System Operator ◽  
Variable Renewable Energy Sources ◽  
Baseline Estimation

The decarbonization of the power sector involves electrification and a massive deployment of variable renewable energy sources, leading to an increase of local transmission congestion and ramping challenges. A possible solution to secure grid stability is local flexibility markets, in which prosumers can offer demand-side flexibility to the distribution system operator or other flexibility buyers through an aggregator. The purpose of this study was to develop a framework for estimating and offering short-term demand-side flexibility to a flexibility marketplace, with the main focus being baseline estimation and bid generation. The baseline is estimated based on forecasts that have been corrected for effects from earlier flexibility activations and potential planned use of internal flexibility. Available flexibility volumes are then estimated based on the baseline, physical properties of the flexibility asset and agreed constraints for baseline deviation. The estimated available flexibility is further formatted into a bid that may be offered to a flexibility marketplace, where buyers can buy and activate the offered flexibility, in whole or by parts. To illustrate and verify the proposed methodology, it was applied to a grocery warehouse. Based on real flexibility constraints, historic meter values, and forecasts for this use-case, we simulated a process where the flexibility is offered to a hypothetic flexibility marketplace through an aggregator.

scholarly journals The Regulatory Framework for Market Transparency in Future Power Systems under the Web-of-Cells Concept

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 880 ◽  
Author(s):  
Viktorija Bobinaite ◽  
Marialaura Di Somma ◽  
Giorgio Graditi ◽  
Irina Oleinikova
Keyword(s):  
Electricity Market ◽  
Distribution System ◽  
Renewable Energy Sources ◽  
Voltage Control ◽  
The European Union ◽  
Market Transparency ◽  
Disclosure Of Information ◽  
System Operator ◽  
Wholesale Electricity Market ◽  
The Web

This paper investigates the regulatory rules of market transparency which could be applied within the wholesale electricity market and market for frequency and voltage control in the Web-of-Cells (WoC) decentralized power control architecture, which has been developed in the ELECTRA Project to respond the challenges and needs of the future power system (2030+). In this decentralized functional architecture for frequency and voltage control, the European Union (EU) power grid is divided into grid control areas, i.e., cells, which are defined as portions of the grid having adequate monitoring infrastructure and local reserves capacity, allowing voltage and balancing (frequency) problems to be solved at cell level, under the responsibility of a Cell System Operator (CSO) (present Distribution System Operator (DSO)/Transmission System Operator (TSO)). In order to foster the practical realization of the WoC-based architecture, the related wholesale electricity market and market for frequency and voltage control are proposed considering the competitive market principles, including transparency. The critical review of the existing EU regulations dealing with this issue suggests respecting the valid provisions on market transparency while tailoring them into the WoC-based architecture. Moreover, in order to take into account the WoC peculiarities, a set of integrations to the current regulatory rules is also proposed, addressing: (1) disclosure of information in respect to attributes of emerging technologies such as renewable energy sources (RES), distributed energy resources (DER), storage; (2) provision of generation and load forecast information; (3) process of procurement of flexibilities; (4) retail market transparency; (5) disclosure of privacy-sensitive household attributes; and (6) disclosure of information on market for frequency and voltage control.

scholarly journals Load Areas in Radial Unbalanced Distribution Systems

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 3030 ◽  
Author(s):  
Giovanni M. Casolino ◽  
Arturo Losi
Keyword(s):  
Renewable Energy ◽  
Distribution System ◽  
Distribution Systems ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Small Scale ◽  
Location Information ◽  
System Operator ◽  
The Individual ◽  
Distribution Grids

The demand becoming flexible is a requirement for the full exploitation of renewable energy sources. Aggregation may foster the provision of flexibility by small-scale providers connected to distribution grids, since it allows offering significant flexibility volumes to the market. The aggregation of flexibility providers is carried out by the aggregator, a new market role and possibly a new market player. Location information of individual flexibility providers is necessary for both the aggregator and the system operators, in particular, the Distribution System Operator (DSO). For the former, information should allow treating a high number of individual flexibility providers as a single provider to offer significant flexibility volumes to the markets; for the latter, the information should ensure an adequate visibility of the connection of the individual providers to the grid. In the paper, the concept of Load Area (LA) is recalled, which combines the needs of location information of the aggregator and of the DSO. A method for the identification and modeling of LAs for the general case of unbalanced radial systems is proposed. The results of the methods’ application to two studied unbalanced networks are presented, showing the effectiveness and viability of the proposed approach.

Optimal solutions for an automatic control system for medium capacity power supply facilities using renewable energy sources

2019 ◽  
Vol 2 (2) ◽  
pp. 69-85
Author(s):  
V. V. Elistratov
Keyword(s):  
Renewable Energy ◽  
Power Plant ◽  
Power Supply ◽  
Distribution System ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Power Conversion ◽  
Energy Sources ◽  
Control Distribution ◽  
Software And Hardware

Introduction: extensive logistics costs (including long distance transportation and high fuel prices) and a high cost of electric energy, generated by diesel power plants, are the main problem of power supply to consumers by off-grid power systems. The author unlocks the potential of hybrid power systems using renewable energy sources and saving expensive fuel. The author offers the analysis of automatic control systems capable of improving the efficiency of subordinate power plant elements.Methods: the author provides a classification of wind-diesel power plants and describes their performance pro rata to the share of wind energy consumption. The author has also compiled a set of specifications applicable to the technological solutions of wind-driven power plants. He also formulates the principles underlying an intelligent automatic control system for off-grid power supply facilities. This system served as the basis for a software and hardware module designed and developed for an intelligent power conversion/control/distribution system. The author provides diagrams of (1) electrical circuits of a software and hardware module for an intelligent power conversion/control/distribution system, and (2) the operation of an off-grid power supply package using renewable energy sources and controlled by the power conversion/control/distribution system. The author analyzes the primary and secondary sources of power in an off-grid power supply facility and describes principles of their operation within a software and hardware module.Results and discussions: the author offers a methodology of intelligent control over off-grid power supply facilities within the framework of the project for development of a wind-diesel power plant in thevillage ofAmderma. The author describes the results of incorporation of a wind-diesel power plant into the power supply facility operating in the permafrost environment of the Arctic region.Conclusion: presently,Russia has pre-conditions in place capable of boosting the development of power supply technologies using hybrid facilities comprising renewable energy sources. The implementation of such off-grid power supply facilities, controlled by newly designed software and hardware modules designated for an intelligent power conversion/ control/distribution system optimizes electric power generation and consumption modes and substantially reduces fuel consumption by diesel power plants.

scholarly journals An MPC-Sliding Mode Cascaded Control Architecture for PV Grid-Feeding Inverters

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2326 ◽  
Author(s):  
Alessandro Palmieri ◽  
Alessandro Rosini ◽  
Renato Procopio ◽  
Andrea Bonfiglio
Keyword(s):  
Distribution System ◽  
Reactive Power ◽  
Sliding Mode ◽  
Renewable Energy Sources ◽  
Control Level ◽  
Operating Mode ◽  
Control Architecture ◽  
System Operator ◽  
Power Point ◽  
Control Theories

The primary regulation of photovoltaic (PV) systems is a current matter of research in the scientific community. In Grid-Feeding operating mode, the regulation aims to track the maximum power point in order to fully exploit the renewable energy sources and produce the amount of reactive power ordered by a hierarchically superior control level or by the local Distribution System Operator (DSO). Actually, this task is performed by Proportional–Integral–Derivative (PID)-based regulators, which are, however, affected by major drawbacks. This paper proposes a novel control architecture involving advanced control theories, like Model Predictive Control (MPC) and Sliding Mode (SM), in order to improve the overall system performance. A comparison with the conventional PID-based approach is presented and the control theories that display a better performance are highlighted.

Economic and environmental aspects of Smart Grid technologies implementation in Ukraine

2020 ◽  
pp. 28-37
Author(s):  
Oleksandra V. Kubatko ◽  
Diana O. Yaryomenko ◽  
Mykola O. Kharchenko ◽  
Ismail Y. A. Almashaqbeh
Keyword(s):  
Smart Grid ◽  
Environmental Sustainability ◽  
Distribution System ◽  
Energy Security ◽  
Smart Grids ◽  
Renewable Energy Sources ◽  
Average Energy ◽  
Time Of Day ◽  
Electricity Supply ◽  
Auxiliary Equipment

Interruptions in electricity supply may have a series of failures that can affect banking, telecommunications, traffic, and safety sectors. Due to the two-way interactive abilities, Smart Grid allows consumers to automatically redirect on failure, or shut down of the equipment. Smart Grid technologies are the costly ones; however, due to the mitigation of possible problems, they are economically sound. Smart grids can't operate without smart meters, which may easily transmit real-time power consumption data to energy data centers, helping the consumer to make effective decisions about how much energy to use and at what time of day. Smart Grid meters do allow the consumer to track and reduce energy consumption bills during peak hours and increase the corresponding consumption during minimum hours. At a higher level of management (e.g., on the level of separate region or country), the Smart Grid distribution system operators have the opportunity to increase the reliability of power supply primarily by detecting or preventing emergencies. Ukraine's energy system is currently outdated and cannot withstand current loads. High levels of wear of the main and auxiliary equipment of the power system and uneven load distribution in the network often lead to emergencies and power outages. The Smart Grid achievements and energy sustainability are also related to the energy trilemma, which consists of key core dimensions– Energy Security, Energy Equity, and Environmental Sustainability. To be competitive in the world energy market, the country has to organize efficiently the cooperation of public/private actors, governments, economic and social agents, environmental issues, and individual consumer behaviors. Ukraine gained 61 positions out of 128 countries in a list in 2019 on the energy trilemma index. In general, Ukraine has a higher than average energy security position and lower than average energy equity, and environmental sustainability positions. Given the fact that the number of renewable energy sources is measured in hundreds and thousands, network management is complicated and requires a Smart Grid rapid response. Keywords: economic development, Smart Grid, electricity supply, economic and environmental efficiency.

scholarly journals A Two-Step State Estimation Algorithm for Hybrid AC-DC Distribution Grids

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1967
Author(s):  
Gaurav Kumar Roy ◽  
Marco Pau ◽  
Ferdinanda Ponci ◽  
Antonello Monti
Keyword(s):  
State Estimation ◽  
Distribution System ◽  
Renewable Energy Sources ◽  
Estimation Algorithm ◽  
The State ◽  
Second Step ◽  
Distribution Grid ◽  
Dc Distribution ◽  
Attractive Option ◽  
Distribution Grids

Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper presents a two-step state estimation formulation for the monitoring of hybrid AC-DC grids. In the first step, state estimation is executed independently for the AC and DC areas of the distribution system. The second step refines the estimation results by exchanging boundary quantities at the AC-DC converters. To this purpose, the modulation index and phase angle control of the AC-DC converters are integrated into the second step of the proposed state estimation formulation. This allows providing additional inputs to the state estimation algorithm, which eventually leads to improve the accuracy of the state estimation results. Simulations on a sample AC-DC distribution grid are performed to highlight the benefits resulting from the integration of these converter control parameters for the estimation of both the AC and DC grid quantities.

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