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Inventions
Special Issues
Inventions and Innovation in Integration of Renewable Energy Systems
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Inventions and Innovation in Integration of Renewable Energy Systems

A special issue of Inventions (ISSN 2411-5134). This special issue belongs to the section "Inventions and Innovation in Electrical Engineering/Energy/Communications".

Deadline for manuscript submissions: closed (30 September 2017) | Viewed by 54920

Special Issue Editors

Prof. Dr. Surya Santoso

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA
Interests: power quality; power system modeling; power system simulation; distributed generation; renewable energy; photovoltaics; wind turbine; energy storage
Special Issues, Collections and Topics in MDPI journals
Dr. Pisitpol Chirapongsananurak

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA
Interests: power quality; power system modeling; power system simulation; distributed generation; renewable energy; photovoltaics; wind turbine; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Increasing penetration of renewable energy sources, such as photovoltaics and wind power generation, raises concerns regarding their impacts on a power system. Although wind and solar power generation can reduce peak load demand and losses in a distribution circuit, these renewable energy sources may cause power quality and protection issues in a circuit, such as voltage regulation, flicker, short-circuit current contribution, and protection coordination. Additional equipment, such as capacitor banks, voltage regulators, static var compensators (SVCs), static synchronous compensators (STATCOMs), and energy storage systems, may be required to provide enhanced voltage regulation. New protection schemes may be developed to mitigate protection issues. This Special Issue of Inventions will include (but is not limited to) the following topics of interest:

  • Advances in technologies of renewable energy systems, voltage regulating devices, and energy storage system
  • Modeling and simulation of renewable energy systems for load flow, dynamic stability, and electromagnetic transient studies
  • Operation and control strategies for renewable energy systems
  • Forecasting wind and solar power generation
  • Impacts of renewable energy systems including voltage regulation, short-circuit contribution, protection coordination, harmonic distortion, and frequency response
  • Maximum capacity of renewable energy systems that can be integrated into a power system
  • Mitigating the impacts of high penetration of renewable energy systems with the help of control of renewable energy sources, voltage regulating devices, energy storage system, and distributed energy resource management systems (DERMS)
  • Cost of increasing the renewable energy penetration in a power system
  • Optimal placement and sizing of renewable energy sources, voltage regulating devices, and energy storage systems for conservation voltage reduction (CVR), voltage regulation, and loss minimization

Surya Santoso
Pisitpol Chirapongsananurak
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Inventions is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • distributed generations
  • renewable energy sources
  • photovoltaics (PVs)
  • wind turbines
  • energy storage systems (ESSs)
  • voltage regulating devices
  • distributed energy resource management systems (DERMSs)

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Published Papers (7 papers)

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Editorial

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2 pages, 630 KiB  
Editorial
Inventions and Innovation in Integration of Renewable Energy Systems
by Pisitpol Chirapongsananurak and Surya Santoso
Inventions 2018, 3(2), 28; https://doi.org/10.3390/inventions3020028 - 17 May 2018
Cited by 1 | Viewed by 4961
Abstract
n/a Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)

Research

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5276 KiB  
Article
Impacts of Voltage Control Methods on Distribution Circuit’s Photovoltaic (PV) Integration Limits
by Anamika Dubey
Inventions 2017, 2(4), 28; https://doi.org/10.3390/inventions2040028 - 25 Oct 2017
Cited by 17 | Viewed by 6769
Abstract
The widespread integration of photovoltaic (PV) units may result in a number of operational issues for the utility distribution system. The advances in smart-grid technologies with better communication and control capabilities may help to mitigate these challenges. The objective of this paper is [...] Read more.
The widespread integration of photovoltaic (PV) units may result in a number of operational issues for the utility distribution system. The advances in smart-grid technologies with better communication and control capabilities may help to mitigate these challenges. The objective of this paper is to evaluate multiple voltage control methods and compare their effectiveness in mitigating the impacts of high levels of PV penetrations on distribution system voltages. A Monte Carlo based stochastic analysis framework is used to evaluate the impacts of PV integration, with and without voltage control. Both snapshot power flow and time-series analysis are conducted for the feeder with varying levels of PV penetrations. The methods are compared for their impacts on (1) the feeder’s PV hosting capacity; (2) the number of voltage violations and the magnitude of the largest bus voltage; (3) the net reactive power demand from the substation; and (4) the number of switching operations of feeder’s legacy voltage support devices i.e., capacitor banks and load tap changers (LTCs). The simulation results show that voltage control help in mitigating overvoltage concerns and increasing the feeder’s hosting capacity. Although, the legacy control solves the voltage concerns for primary feeders, a smart inverter control is required to mitigate both primary and secondary feeder voltage regulation issues. The smart inverter control, however, increases the feeder’s reactive power demand and the number of LTC and capacitor switching operations. For the 34.5-kV test circuit, it is observed that the reactive power demand increases from 0 to 6.8 MVAR on enabling Volt-VAR control for PV inverters. The total number of capacitor and LTC operations over a 1-year period also increases from 455 operations to 1991 operations with Volt-VAR control mode. It is also demonstrated that by simply changing the control mode of capacitor banks, a significant reduction in the unnecessary switching operations for the capacitor banks is observed. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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5440 KiB  
Article
Analysing Renewable Energy Source Impacts on Power System National Network Code
by Georgiana Balaban, George Cristian Lazaroiu, Virgil Dumbrava and Catalina Alexandra Sima
Inventions 2017, 2(3), 23; https://doi.org/10.3390/inventions2030023 - 31 Aug 2017
Cited by 20 | Viewed by 6947
Abstract
This paper analyses the impact on renewable energy sources integrated into the Romanian power system on the electrical network operation considering the reduction of electricity consumption with respect to the 1990s. This decrease has led to increased difficulties in integrating the renewable energy [...] Read more.
This paper analyses the impact on renewable energy sources integrated into the Romanian power system on the electrical network operation considering the reduction of electricity consumption with respect to the 1990s. This decrease has led to increased difficulties in integrating the renewable energy sources into the power system (network reinforcements), as well as issues concerning the balance of production/consumption. Following the excess of certain proportions of the energy mix, intermittent renewable energy sources require the expansion of networks, storage, back-up capacities and efforts for a flexible consumption, in the absence of which renewable energy sources cannot be used or the grid can be overloaded. To highlight the difficulty of connecting some significant capacities installed in wind power plants and photovoltaic installation, the paper presents a case study for Dobrogea area that has the most installed capacity from renewable energy sources in operation. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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1807 KiB  
Article
Statistical Inference for Visualization of Large Utility Power Distribution Systems
by Miguel Hernandez, Gustavo Ramos, Harsha V. Padullaparti and Surya Santoso
Inventions 2017, 2(2), 11; https://doi.org/10.3390/inventions2020011 - 8 Jun 2017
Cited by 5 | Viewed by 6712
Abstract
Electrical variable visualization has been widely applied to report the performance and effectiveness of novel devices and strategies in utility power distribution systems. Many graphical alternatives are useful to demonstrate critical characteristics of distribution systems such as voltage regulation or power flow. This [...] Read more.
Electrical variable visualization has been widely applied to report the performance and effectiveness of novel devices and strategies in utility power distribution systems. Many graphical alternatives are useful to demonstrate critical characteristics of distribution systems such as voltage regulation or power flow. This visualization of electrical variables can also be an effective approach to analyze, compare and evaluate large-scale systems. However, there is a lack of generalized visualization strategies oriented to perform electrical validations of smart grid strategies in large distribution systems. In this paper, we show that the proposed probabilistic density evolution is a powerful resource for long-term time-sequential simulations. Examinations with an IEEE 8500 node test feeder shows that the proposed approach increases the circuit situational awareness and reduces the validation time. To illustrate this methodology, the dynamic voltage condition was simulated and analyzed to recognize the global effect of voltage regulating equipment. The results show an accurate and convenient support that can be interpreted at first glance. The proper use of long-term field measurements and short time-step simulations is a robust method for future grid research, such as designing an optimum operation of intelligent devices or diagnosing electrical interoperability issues in complex grids. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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973 KiB  
Article
Multi-Time-Scale Simulation Tool for Renewable Energy Integration Analysis in Distribution Circuits
by Pisitpol Chirapongsananurak and Surya Santoso
Inventions 2017, 2(2), 7; https://doi.org/10.3390/inventions2020007 - 13 Apr 2017
Cited by 6 | Viewed by 7822
Abstract
This paper develops a distribution circuit multi-time-scale simulation tool for applications in wind turbine and photovoltaic (PV) integration analysis. The proposed simulation tool developed in MATLAB™ includes several distribution circuit components, such as voltage sources, distribution lines, transformers, loads, capacitor banks, wind turbines [...] Read more.
This paper develops a distribution circuit multi-time-scale simulation tool for applications in wind turbine and photovoltaic (PV) integration analysis. The proposed simulation tool developed in MATLAB™ includes several distribution circuit components, such as voltage sources, distribution lines, transformers, loads, capacitor banks, wind turbines and PVs. Each equipment consists of three models for simulations in three different time scales, i.e., steady-state, electromechanical transient and electromagnetic transient models. Therefore, the proposed tool is able to perform a long-term simulation involving power system phenomena spreading across time scales. The test circuits employed to perform multi-time-scale simulation in this paper are modified from the IEEE four-node test feeder. The simulation scenarios include wind speed and solar irradiance ramp up and down; a capacitor bank is energized and de-energized; and a single-line-to-ground fault occurs and clears itself. The simulation results show that the proposed tool is capable of evaluating power system phenomena spread across time scales. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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3720 KiB  
Article
A Framework for Stacked-Benefit Analysis of Distribution-Level Energy Storage Deployment
by Anamika Dubey, Pisitpol Chirapongsananurak and Surya Santoso
Inventions 2017, 2(2), 6; https://doi.org/10.3390/inventions2020006 - 28 Mar 2017
Cited by 3 | Viewed by 6245
Abstract
This paper presents a planning framework for integrating energy storage (ES) systems into the distribution system. An ES system is deployed to simultaneously provide multiple benefits, also known as stacked-benefits, for the feeder. The primary and secondary application scenarios for the feeder are [...] Read more.
This paper presents a planning framework for integrating energy storage (ES) systems into the distribution system. An ES system is deployed to simultaneously provide multiple benefits, also known as stacked-benefits, for the feeder. The primary and secondary application scenarios for the feeder are identified. The proposed ES deployment approach includes the following steps: (1) size the ES system for primary application; (2) identify optimal ES locations based on both primary and secondary application scenarios; (3) calculate the ES accommodation capacity for each potential location; and (4) develop control methods for ES units and conduct grid impact analysis to demonstrate ES applications. For the selected feeder, the primary application for ES deployment is to provide the N-1 contingency requirement. During normal operating conditions, ES is programmed for multiple secondary applications: voltage management and ancillary services by frequency regulation. A probabilistic approach is presented to obtain the optimal ES size for providing the N-1 contingency requirement. Optimal ES locations are obtained based on secondary application scenarios. Real and reactive power control methods are developed to demonstrate the viability of deploying an ES system for simultaneously providing multiple applications. The simulation results show that ES can successfully provide the stacked-benefits for the distribution circuit. The proposed framework is generic and can be employed for the ES integration analysis of any feeder, with different sets of primary and secondary applications. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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Review

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7112 KiB  
Review
Review of Tidal Lagoon Technology and Opportunities for Integration within the UK Energy System
by Grazia Todeschini
Inventions 2017, 2(3), 14; https://doi.org/10.3390/inventions2030014 - 28 Jul 2017
Cited by 131 | Viewed by 13952
Abstract
The number of distributed resources for renewable energy installed worldwide has been increasing rapidly in the last decade, and the great majority of these installations consist of solar panels and wind turbines. Other renewable sources of energy are not exploited to the same [...] Read more.
The number of distributed resources for renewable energy installed worldwide has been increasing rapidly in the last decade, and the great majority of these installations consist of solar panels and wind turbines. Other renewable sources of energy are not exploited to the same level: for instance, tidal energy is still a minute portion of the global energy capacity, in spite of the large amount of potential energy stored in tidal waves, and of the successful experience of the few existing plants. The world’s second largest tidal range occurs in the UK but at the moment tidal installations in this country are limited to a few prototypes. More recently, there has been a renewed interest in harnessing tidal energy in the UK, and a few tidal lagoon projects have been evaluated by the UK government. This paper provides an overview of the historical and current developments of tidal plants, a description of operation of tidal lagoons, challenges and opportunities for their integration within the UK energy systems and solutions to improve the dispatchability of tidal energy. The concepts described in the paper are applied to a tidal project proposed for South Wales. Full article
(This article belongs to the Special Issue Inventions and Innovation in Integration of Renewable Energy Systems)
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