Experimental Analysis Of Distribution Network Voltage Regulation Using Smart Inverters Preprint
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Experimental Analysis Of Distribution Network Voltage Regulation Using Smart Inverters Preprint
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Author :
language : en
Publisher:
Release Date : 2023
Experimental Analysis Of Distribution Network Voltage Regulation Using Smart Inverters Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Smart inverters (SI) have huge potential in providing grid services which has not been fully realized yet. One of these grid services, distribution network voltage regulation by SI, can improve the network voltage by regulating the SI reactive and active power output. Voltage regulation by SI is much faster compared to traditional voltage regulating devices, e.g. tap changing transformer, capacitor banks. However, there is gap in available published literature on the characteristics of SIs when the SI is controlled by local controller or external control signal. This paper presents the experimental study to characterize SI reactive power regulation response to two different control methods: autonomous control method and remote dispatch method. It was found that IS reactive power regulation response could be significantly different in terms of delay, and ramp rate for these two methods. Finally, Power-Hardware-in-The-Loop (PHIL) tests were conducted to evaluate the performance of these two methods. The PHIL tests results show that SI response characteristics for autonomous control method and remote dispatch method need to be considered during planning for distribution network voltage regulation using SI.
Series Parallel Converter Based Microgrids
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Author : Yao Sun
language : en
Publisher: Springer Nature
Release Date : 2022-02-11
Series Parallel Converter Based Microgrids written by Yao Sun and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-11 with Technology & Engineering categories.
Series-Parallel Converter-Based Microgrids: System-Level Control and Stability is the first book to provide a comprehensive and in-depth introduction to the rapid development of series-parallel converter applications in the microgrid system. It provides an advanced and in-depth introduction into all major system modeling, coordinated control, and stability analysis issues, and provides useful methodologies and philosophies for developing new topologies and controls for self-organized decentralized operation of microgrid systems. For each topic, a theoretical introduction and overview are backed by very concrete programming examples that enable the reader to not only understand the topic but to develop microgrid simulation models.
Proceedings Of The Second Congress On Control Robotics And Mechatronics
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Author : Pradeep Kumar Jha
language : en
Publisher: Springer Nature
Release Date : 2024-11-13
Proceedings Of The Second Congress On Control Robotics And Mechatronics written by Pradeep Kumar Jha and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-11-13 with Technology & Engineering categories.
This book features high-quality research papers presented at the International Conference of Mechanical and Robotic Engineering “Congress on Control, Robotics, and Mechatronics” (CRM 2024), jointly organized by SR University, Warangal, India, and Soft Computing Research Society, India, during 3–4 February 2024. This book discusses the topics such as combustion and fuels, controls and dynamics, fluid mechanics, I.C. engines and automobile engineering, machine design, mechatronics, rotor dynamics, solid mechanics, thermodynamics and combustion engineering, composite material, aerodynamics, aerial vehicles, missiles and robots, automatic design and manufacturing, artificial intelligence, unmanned aerial vehicles, autonomous robotic vehicles, evolutionary robotics, humanoids, hardware architecture, industrial robotics, intelligent control systems, microsensors and actuators, multi-robots systems, neural decoding algorithms, neural networks for mobile robots, space robotics, control theory and applications, model predictive control, variable structure control, and decentralized control.
Voltage Regulation For Distribution Networks With Smart Photovoltaic Inverters
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Author : Yao Long
language : en
Publisher:
Release Date : 2021
Voltage Regulation For Distribution Networks With Smart Photovoltaic Inverters written by Yao Long and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Traditional mechanical device-based voltage regulation becomes less effective when the high penetration of photovoltaic (PV) generation introduces rapid and frequent voltage fluctuations to the distribution networks. The PV inverters which are able to provide fast and flexible reactive power compensation are thus encouraged to participate in the voltage regulation. Particularly, the smart PV inverters with sensing, communicating and computing capabilities are able to act autonomously and cooperatively. This dissertation studies the coordinated voltage regulation for distribution networks with smart PV inverters. For the coordination among the large number of smart inverters, we develop an adaptive coalition formation-based strategy. This strategy enables the PV inverters to determine their scope of cooperation according to the real-time network operating condition. The PV inverters are thus able to eliminate voltage violations and fairly share the required reactive power contribution according to their maximum available regulation capacity. For the coordination between the smart inverter group and the utility-controlled mechanical devices, we propose a bi-level optimization-based voltage regulation framework. This bi-level optimization model captures the interactions between the different types of devices and allows them to cooperatively optimize their voltage regulation goals. This two-timescale framework ensures global economical efficiency while maintaining satisfactory dynamic regulation performances. Both studies are demonstrated based on realistic distribution networks with field-recorded data.
Dispatchable Virtual Oscillator Control For Decentralized Inverter Dominated Power Systems Analysis And Experiments Preprint
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Author :
language : en
Publisher:
Release Date : 2019
Dispatchable Virtual Oscillator Control For Decentralized Inverter Dominated Power Systems Analysis And Experiments Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This paper presents an analysis and experimental validation of dispatchable virtual oscillator control (dVOC) for inverter-dominated power systems. dVOC is a promising decentralized control strategy that requires only local measurements to induce grid-forming behavior with programmable droop characteristics. It is dispatchable -- i.e., the inverters can vary their power generation via user-defined power set-points and guarantees strong stability. To verify its feasibility, a testbed comprising multiple dVOC-programmed inverters with transmission line impedances is designed. With an embedded synchronization strategy, the dVOC inverters are capable of dynamic synchronization, black start operation, and transient grid voltage regulation with dynamic load sharing, and real-time-programmable droop characteristics for backward compatibility. All these features are experimentally verified.
Coordinated Voltage Regulation Of Distribution Networks
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Author : Changfu Li
language : en
Publisher:
Release Date : 2020
Coordinated Voltage Regulation Of Distribution Networks written by Changfu Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Electrical power grid is one of the most complex engineering systems. The conventional power grid is designed with centralized power plants and unidirectional electricity flow from plants to consumers on the distribution network. However, there has been increasing adoption of renewable distributed energy resources (DERs) like solar Photovoltaics (PV) generation on the distribution power grid due to their associated environmental and economical benefits. Fluctuating and distributed solar generation can lead to power ramps and two-way power flows, potentially driving the service voltage out of acceptable ranges. Advanced coordinated voltage regulation is needed to integrate high solar penetrations into distribution networks. In this dissertation, three different coordinated voltage regulation methods are proposed to tackle the voltage regulation challenges arising from increasing solar generation. The first one optimizes legacy voltage regulation devices (on-load tap changers (OLTCs)). Linearizations are proposed to to reduce computation burden. Comprehensive simulations show that the proposed method enables 67% more PV connection comparing to conventional autonomous OLTC control. The second one investigates coordination between legacy OLTCs and emerging PV smart inverters with optimization. Nonlinear constraints are relaxed through proposed linearization techniques. Simulations demonstrate improved voltage profiles and significant reduction of OLTC operations from intelligent coordination between OLTCs and SIs. Robustness against forecasting errors (up to 30%) is also validated. Finally, a data-driven framework using deep reinforcement learning (DRL) is introduced for PV smart inverters coordination. The reward scheme is carefully designed to balance voltage regulation and reactive power generation. Comprehensive tests prove a well-trained DRL agent can achieve near optimal performance with over 99% reduction in computation time comparing to optimization approach.
Control Of Power Inverters In Renewable Energy And Smart Grid Integration
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Author : Qing-Chang Zhong
language : en
Publisher: John Wiley & Sons
Release Date : 2012-11-16
Control Of Power Inverters In Renewable Energy And Smart Grid Integration written by Qing-Chang Zhong and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-16 with Technology & Engineering categories.
Integrating renewable energy and other distributed energy sources into smart grids, often via power inverters, is arguably the largest “new frontier” for smart grid advancements. Inverters should be controlled properly so that their integration does not jeopardize the stability and performance of power systems and a solid technical backbone is formed to facilitate other functions and services of smart grids. This unique reference offers systematic treatment of important control problems in power inverters, and different general converter theories. Starting at a basic level, it presents conventional power conversion methodologies and then ‘non-conventional’ methods, with a highly accessible summary of the latest developments in power inverters as well as insight into the grid connection of renewable power. Consisting of four parts – Power Quality Control, Neutral Line Provision, Power Flow Control, and Synchronisation – this book fully demonstrates the integration of control and power electronics. Key features include: the fundamentals of power processing and hardware design innovative control strategies to systematically treat the control of power inverters extensive experimental results for most of the control strategies presented the pioneering work on “synchronverters” which has gained IET Highly Commended Innovation Award Engineers working on inverter design and those at power system utilities can learn how advanced control strategies could improve system performance and work in practice. The book is a useful reference for researchers who are interested in the area of control engineering, power electronics, renewable energy and distributed generation, smart grids, flexible AC transmission systems, and power systems for more-electric aircraft and all-electric ships. This is also a handy text for graduate students and university professors in the areas of electrical power engineering, advanced control engineering, power electronics, renewable energy and smart grid integration.
Feeder Voltage Regulation With High Penetration Pv Using Advanced Inverters And A Distribution Management System
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Author :
language : en
Publisher:
Release Date : 2016
Feeder Voltage Regulation With High Penetration Pv Using Advanced Inverters And A Distribution Management System written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Duke Energy, Alstom Grid, and the National Renewable Energy Laboratory teamed up to better understand the impacts of solar photovoltaics (PV) on distribution system operations. The core goal of the project is to compare the operational - specifically, voltage regulation - impacts of three classes of PV inverter operations: 1.) Active power only (Baseline); 2.) Local inverter control (e.g., PF ... not equal ... 1, Q(V), etc.); and 3.) Integrated volt-VAR control (centralized through the distribution management system). These comparisons were made using multiple approaches, each of which represents an important research-and-development effort on its own: a) Quasi-steady-state time-series modeling for approximately 1 year of operations using the Alstom eTerra (DOTS) system as a simulation engine, augmented by Python scripting for scenario and time-series control and using external models for an advanced inverter; b) Power-hardware-in-the-loop (PHIL) testing of a 500-kVA-class advanced inverter and traditional voltage regulating equipment. This PHIL testing used cosimulation to link full-scale feeder simulation using DOTS in real time to hardware testing; c) Advanced visualization to provide improved insights into time-series results and other PV operational impacts; and d) Cost-benefit analysis to compare the financial and business-model impacts of each integration approach.
Smart Pv Inverter Control For Distribution Systems
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Author : Ehsan M. Siavashi
language : en
Publisher:
Release Date : 2015
Smart Pv Inverter Control For Distribution Systems written by Ehsan M. Siavashi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
PV solar systems employ inverters to transform dc power from solar panels into ac power for injecting into the power grids. Inverters that perform multiple functions in addition to real power production are known as smart inverters. This thesis presents a novel control of PV inverter as a dynamic reactive power compensator - STATCOM. This smart PV inverter control enables a PV solar inverter to operate in three modes - i) Full PV, ii) Partial STATCOM, and iii) Full STATCOM, depending upon system needs. The novel control is developed and demonstrated for the objectives of a) symmetrical voltage regulation, b) temporary overvoltage reduction, c) power factor correction, and d) reactive power control. In Full PV mode, the inverter performs only real power production based on solar radiation. In Partial STATCOM mode, the controller uses the remaining capacity of the inverter for voltage control, power factor correction and reactive power control. The Full STATCOM mode is invoked in emergency scenarios, such as faults, or severe voltage fluctuations. In this mode, the real power production is shut down temporarily and the entire inverter capacity is utilized for voltage regulation or TOV curtailment for providing critical support to the power system. This thesis presents a comprehensive design of the proposed smart inverter controller with all its associated system components. The performance of the smart inverter is simulated using the electromagnetic transients software PSCAD/EMTDC. It is further validated through Real Time Digital Simulation and Control Hardware in the Loop (CHIL) simulation. Finally the successful performance of the smart inverter controller is demonstrated on a 10 kW inverter in the laboratory on a simulated feeder of Bluewater Power, Sarnia, where this smart inverter is proposed to be installed. The smart PV inverter control is further shown to enhance the connectivity of PV solar farms in a realistic 44 kV Hydro One distribution feeder. It is demonstrated that if such a novel control is implemented on a 10 MW solar farm, the need for the actually installed STATCOM for voltage regulation and TOV control can be either minimized or altogether eliminated, bringing a significant savings for the utility. PV solar systems employ inverters to transform dc power from solar panels into ac power for injecting into the power grids. Inverters that perform multiple functions in addition to real power production are known as smart inverters. This thesis presents a novel control of PV inverter as a dynamic reactive power compensator - STATCOM. This smart PV inverter control enables a PV solar inverter to operate in three modes - i) Full PV, ii) Partial STATCOM, and iii) Full STATCOM, depending upon system needs. The novel control is developed and demonstrated for the objectives of a) symmetrical voltage regulation, b) temporary overvoltage reduction, c) power factor correction, and d) reactive power control. In Full PV mode, the inverter performs only real power production based on solar radiation. In Partial STATCOM mode, the controller uses the remaining capacity of the inverter for voltage control, power factor correction and reactive power control. The Full STATCOM mode is invoked in emergency scenarios, such as faults, or severe voltage fluctuations. In this mode, the real power production is shut down temporarily and the entire inverter capacity is utilized for voltage regulation or TOV curtailment for providing critical support to the power system. This thesis presents a comprehensive design of the proposed smart inverter controller with all its associated system components. The performance of the smart inverter is simulated using the electromagnetic transients software PSCAD/EMTDC. It is further validated through Real Time Digital Simulation and Control Hardware in the Loop (CHIL) simulation. Finally the successful performance of the smart inverter controller is demonstrated on a 10 kW inverter in the laboratory on a simulated feeder of Bluewater Power, Sarnia, where this smart inverter is proposed to be installed. The smart PV inverter control is further shown to enhance the connectivity of PV solar farms in a realistic 44 kV Hydro One distribution feeder. It is demonstrated that if such a novel control is implemented on a 10 MW solar farm, the need for the actually installed STATCOM for voltage regulation and TOV control can be either minimized or altogether eliminated, bringing a significant savings for the utility.
Control Of Grid Connected Three Phase Three Wire Voltage Sourced Inverters Under Voltage Disturbances
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Author : Miguel Andrés Garnica López
language : en
Publisher:
Release Date : 2019
Control Of Grid Connected Three Phase Three Wire Voltage Sourced Inverters Under Voltage Disturbances written by Miguel Andrés Garnica López and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The present doctoral thesis focuses on designing control schemes for three-phase three-wire voltage-sourced inverters connected to the grid under voltage disturbances. The research recognizes the large-scale integration of distributed power generation systems into the network and takes advantage of this circumstance to investigate and develop new control strategies in order to provide better support to the modern power grid. As a first contribution, a new algorithm to maximize power delivery capability of the inverter has been developed and experimentally tested under voltage imbalance conditions, i.e., during slight/shallow and deep asymmetrical sags. The algorithm of this control strategy meets grid code requirements, performs active power control, limits the maximum current injected by the inverter, and eliminates active power oscillations. As a result, six different cases of current injection were identified in this work, considering restrictions imposed by grid codes as well as different active-power production scenarios. The second contribution of this research work has provided an experimental analysis of a low-voltage ride-through strategy whose voltage support capability had not been tested when voltage sags occur. This study was performed considering a scenario of multiple grid-connected inverters, different profiles of active power injection, and the equivalent grid impedance seen from the output side of each converter. In the third contribution has been proposed a closed-loop controller for low-power distributed inverters that maximizes the current injection when voltage sag occurs. The control algorithm has been designed to meet grid code requirements and avoid overvoltage in non-faulty phases during grid faults. The controller is responsible for meeting coordinately several objectives and addressing the interactions that appear among them. In the last two chapters, the argument of this doctoral thesis is complemented, the obtained experimental results are globally analyzed, finally, the present research work is concluded.