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Integrated Transmission and Distribution System Analysis

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (20 May 2021) | Viewed by 13046

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Prof. Dr. Robert P. Broadwater

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Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
Interests: software systems; cloud computing; power; control
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Special Issue Information

Dear Colleagues,

This Special Issue investigates problems where the analysis uses an integrated transmission and distribution system model. Such an integrated system model is also referred to as a hybrid model. High levels of renewable energy sources at the distribution level, and the resulting effect on the transmission system, are encouraged. Articles that report results for very-large-scale systems (e.g., greater than 100,000 nodes) are encouraged.

Topics of interest include:

Assessing the impact of renewable generation and energy storage on the electric power system;
Smart grid applications;
Data-driven analysis;
Machine-learning algorithms;
Employing measurement data (e.g., from PMUs and AMI) in analysis;
Techniques for analyzing system stability and detecting instabilities in real-time;
Energy trading that addresses micro-grids and/or electric power prosumers.

Prof. Dr. Robert P. Broadwater
Guest Editor

Keywords

Integrated transmission and distribution system
Hybrid power system
Large-scale modeling
Renewable energy sources
Energy storage
Batteries
Distributed power generation
Solar energy
Photovoltaic systems
Wind energy
Microgrids
Smart grids
Power system stability

Power system analysis computing
Power system management
Energy trading

Published Papers (4 papers)

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Research

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15 pages, 3528 KiB

Open AccessArticle

Analyzing Impact of Distributed PV Generation on Integrated Transmission & Distribution System Voltage Stability—A Graph Trace Analysis Based Approach

by Bilal Ahmad Bhatti, Robert Broadwater and Murat Dilek

Energies 2020, 13(17), 4526; https://0-doi-org.brum.beds.ac.uk/10.3390/en13174526 - 1 Sep 2020

Cited by 8 | Viewed by 2074

Abstract

The use of a Graph Trace Analysis (GTA)-based power flow for analyzing the voltage stability of integrated Transmission and Distribution (T&D) networks is discussed in the context of distributed Photovoltaic (PV) generation. The voltage stability of lines and the load carrying capability of buses is analyzed at various PV penetration levels. It is shown that as the PV generation levels increase, an increase in the steady state voltage stability of the system is observed. Moreover, within certain regions of stability margin changes, changes in voltage stability margins of transmission lines are shown to be linearly related to changes in the loading of the lines. Two case studies are presented, where one case study involves a model with eight voltage levels and 784,000 nodes. In one case study, a voltage-stability heat map is used to demonstrate the identification of weak lines and buses. Full article

(This article belongs to the Special Issue Integrated Transmission and Distribution System Analysis)

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15 pages, 7262 KiB

Open AccessArticle

Maximizing Distributed Energy Resource Hosting Capacity of Power System in South Korea Using Integrated Feeder, Distribution, and Transmission System

by Victor Widiputra, Junhyuk Kong, Yejin Yang, Jaesung Jung and Robert Broadwater

Energies 2020, 13(13), 3367; https://0-doi-org.brum.beds.ac.uk/10.3390/en13133367 - 1 Jul 2020

Cited by 5 | Viewed by 2316

Abstract

Intermittent power generated from renewable distributed energy resource (DER) can create voltage stability problems in the system during peak power production in the low demand period. Thus, the existing standard for operation and management of the distribution system limits the penetration level of the DER and the amount of load in a power system. In this standard, the hosting capacity of the DER is limited to each feeder at a level where the voltage problem does not occur. South Korea applied this standard, thereby making it hard to achieve its DER target. However, by analyzing the voltage stability of an integrated system, the hosting capacity of DER can be increased. Therefore, in this study, the maximum hosting capacity of DER is determined by analyzing an integrated transmission and distribution system. Moreover, the fast voltage stability index (FVSI) is used to verify the determined hosting capacity of DER. For this, the existing interconnection standard of DER at a feeder, distribution system, and transmission system level is investigated. Subsequently, a Monte Carlo simulation is performed to determine the maximum penetration of the DER at a feeder level, while varying the load according to the standard test system in South Korea. The actual load generation profile is used to simulate system conditions in order to determine the maximum DER hosting capacity. Full article

(This article belongs to the Special Issue Integrated Transmission and Distribution System Analysis)

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13 pages, 3044 KiB

Open AccessArticle

Utilization of Energy Storage System for Frequency Regulation in Large-Scale Transmission System

by Minhan Yoon, Jaehyeong Lee, Sungyoon Song, Yeontae Yoo, Gilsoo Jang, Seungmin Jung and Sungchul Hwang

Energies 2019, 12(20), 3898; https://0-doi-org.brum.beds.ac.uk/10.3390/en12203898 - 15 Oct 2019

Cited by 21 | Viewed by 3430

Abstract

As the penetration rate of renewable enery resources (RES) in the power system increases, uncertainty and variability in system operation increase. The application of energy storage systems (ESS) in the power system has been increased to compensate for the characteristics of renewable energy resources. Since ESS is a controllable and highly responsive power resource, primary frequency response and inertia response are possible in case of system contingency, so it can be utilized for frequency regulation (FR) purposes. In frequency regulation, reduction of the Rate of Change of Frequency (RoCoF) and increase the frequency nadir by improving the response characteristics are important factors to secure frequency stability. Therefore, it is important to control ESS with proper parameters according to changing system situation. In this paper, we propose a method to calculate and apply a frequency droop, which is basically required according to the power system condition based on swing equation and effective inertia assessment. In addition, a method to estimate RoCoF droop according to the correlation with frequency by estimating the systematic inertia in the current situation is proposed. The case study for verification of the proposed method was performed through dynamic simulation using actual Korean power system data. The results show that the proposed method is more effective than the governor-free of the conventional thermal generator and conventional droop control-based FR-ESS. Full article

(This article belongs to the Special Issue Integrated Transmission and Distribution System Analysis)

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Review

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28 pages, 1892 KiB

Open AccessReview

Integrated Transmission-and-Distribution System Modeling of Power Systems: State-of-the-Art and Future Research Directions

by Himanshu Jain, Bilal Ahmad Bhatti, Tianying Wu, Barry Mather and Robert Broadwater

Energies 2021, 14(1), 12; https://0-doi-org.brum.beds.ac.uk/10.3390/en14010012 - 22 Dec 2020

Cited by 16 | Viewed by 4591

Abstract

Integrated transmission-and-distribution (T&D) modeling is a new and developing method for simulating power systems. Interest in integrated T&D modeling is driven by the changes taking place in power systems worldwide that are resulting in more decentralized power systems with increasingly high levels of distributed energy resources. Additionally, the increasing role of the hitherto passive energy consumer in the management and operation of power systems requires more capable and detailed integrated T&D modeling to understand the interactions between T&D systems. Although integrated T&D modeling has not yet found widespread commercial application, its potential for changing the decades-old power system modeling approaches has led to several research efforts in the last few years that tried to (i) develop algorithms and software for steady-state and dynamic modeling of power systems and (ii) demonstrate the advantages of this modeling approach compared with traditional, separated T&D system modeling. In this paper, we provide a review of integrated T&D modeling research efforts and the methods employed for steady-state and dynamic modeling of power systems. We also discuss our current research in integrated T&D modeling and the potential directions for future research. This paper should be useful for power systems researchers and industry members because it will provide them with a critical summary of current research efforts and the potential topics where research efforts are needed to further advance and demonstrate the utility of integrated T&D modeling. Full article

(This article belongs to the Special Issue Integrated Transmission and Distribution System Analysis)

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