106 results found
Akhtar Z, Chaudhuri B, Hui SYR, 2017, Smart Loads for Voltage Control in Distribution Networks, IEEE Transactions on Smart Grid, Vol: 8, Pages: 937-946, ISSN: 1949-3053
© 2010-2012 IEEE. This paper shows that the smart loads (SLs) could be effective in mitigating voltage problems caused by photovoltaic (PV) generation and electric vehicle (EV) charging in low-voltage (LV) distribution networks. Limitations of the previously reported SL configuration with only series reactive compensator (SLQ) (one converter) is highlighted in this paper. To overcome these limitations, an additional shunt converter is used in back-To-back (B2B) configuration to support the active power exchanged by the series converter, which increases the flexibility of the SL without requiring any energy storage. Simulation results on a typical U.K. LV distribution network are presented to compare the effectiveness of an SL with B2B converters (SLBCs) against an SLQ in tackling under-and over-voltage problems caused by EV or PV. It is shown that SLBCs can regulate the main voltage more effectively than SLQs especially under over-voltage condition. Although two converters are required for each SLBC, it is shown that the apparent power capacity of each converter is required to be significantly less than that of an equivalent SLQ.
Chakravorty D, Chaudhuri B, Hui S, 2017, Estimation of Aggregate Reserve with Point-of-Load Voltage Control, IEEE Transactions on Smart Grid, Pages: 1-1, ISSN: 1949-3053
Chakravorty D, Chaudhuri B, Hui SYR, 2017, Rapid Frequency Response From Smart Loads in Great Britain Power System, IEEE TRANSACTIONS ON SMART GRID, Vol: 8, Pages: 2160-2169, ISSN: 1949-3053
Luo X, Lee CK, Ng WM, et al., 2017, Use of adaptive thermal storage system as smart load for voltage control and demand response, IEEE Transactions on Smart Grid, Vol: 8, Pages: 1231-1241, ISSN: 1949-3053
© 2017 IEEE. This paper describes how a large-scale ice-thermal storage can be turned into a smart load for fast voltage control and demand-side management in power systems with intermittent renewable power, while maintaining its existing function of load shaving. The possibility of modifying a conventional thermal load has been practically demonstrated in a refrigerator using power electronics technology. With the help of an electric spring, the modified thermal load can reduce power imbalance in buildings while providing active and reactive power compensation for the power grid. Based on practical data, a building energy model incorporating a large-scale ice-thermal storage system has been successfully used to demonstrate the advantageous demand-response features using computer simulation of both grid connected and isolated power systems. The results indicate the potential of using ice-thermal storage in tall buildings in reducing voltage and frequency fluctuations in weak power grids.
Martinez Sanz I, Judge PD, Spallarossa CE, et al., 2017, Dynamic Overload Capability of VSC HVDC Interconnections for Frequency Support, IEEE Transactions on Energy Conversion, ISSN: 0885-8969
CCBY In future power systems reduced overall inertia caused by an increased dominance of asynchronous generation and interconnections would make frequency control particularly challenging. As the number and power rating of Voltage Source Converter (VSC) HVDC systems increases, network service provision would be expected from such systems and to do so would require overload capacity to be included in the converter specifications. This paper studies the provision of frequency services from Modular Multilevel Converter (MMC)-based VSC HVDC interconnections using temperature-constrained overload capability. Overload of the MMC-based HVDC system is achieved through controlled circulating currents, at the expense of higher losses, and subject to a control scheme which dynamically limits the overload available in order to keep the semiconductor junction temperatures within operational limits. Two frequency control schemes that use the obtained overload capacity to provide frequency response during emergency conditions are investigated. The controllers & #x0027; performance is demonstrated in the context of the future Great Britain transmission grid through a reduced equivalent test system. Simulation results show that even modest temperature margins which allow overload of MMC-based HVDC systems for a few seconds are effective as a primary frequency reserve and also reduce the loss of infeed requirements of such interconnections.
Pipelzadeh Y, Chaudhuri NR, Chaudhuri B, et al., 2017, Coordinated Control of Offshore Wind Farm and Onshore HVDC Converter for Effective Power Oscillation Damping, IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 32, Pages: 1860-1872, ISSN: 0885-8950
Pipelzadeh Y, Moreno R, Chaudhuri B, et al., 2017, Corrective Control With Transient Assistive Measures: Value Assessment for Great Britain Transmission System, IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 32, Pages: 1638-1650, ISSN: 0885-8950
Trovato V, Martinez-Sanz I, Chaudhuri B, et al., 2017, Advanced Control of Thermostatic Loads for Rapid Frequency Response in Great Britain, 2017 IEEE MANCHESTER POWERTECH, Vol: 32, Pages: 2106-2117, ISSN: 0885-8950
Yan S, Lee CK, Yang T, et al., 2017, Extending the operating range of electric spring using back-to-back converter: Hardware implementation and control, IEEE Transactions on Power Electronics, Vol: 32, Pages: 5171-5179, ISSN: 0885-8993
© 1986-2012 IEEE. This paper presents the first hardware implementation and control of an electric spring based on a back-to-back converter configuration. Because of its ability to provide both active and reactive power compensation, this back-to-back electric spring (ES-B2B) can substantially extend the operating range of the original version of the electric spring (ES-1) and provide enhanced voltage support and suppression functions. The hardware system and control of the ES-B2B have been successfully developed and tested. The experimental results have confirmed the effectiveness of the ES-B2B in supporting and suppressing the mains voltage. Particularly, the voltage suppression ability of the ES-B2B is superior over that of ES-1. The use of ES-B2B in a simulation study of a weak power grid has also been conducted. The ES-B2B has been found to be highly effective in mitigating voltage fluctuation caused by intermittent renewable power generation.
Yan S, Wang MH, Yang TB, et al., 2017, Achieving Multiple Functions of 3-Phase Electric Springs in Unbalanced 3-Phase Power Systems Using the Instantaneous Power Theory, IEEE Transactions on Power Electronics, ISSN: 0885-8993
IEEE Three-phase electric spring (3-ph ES) has recently been proposed as a fast demand response technology for applications in unbalanced power systems fed with a mixture of conventional and renewable power generation. Using the Instantaneous Power Theory as the theoretical framework, this paper presents the criteria and conditions for minimizing the average and oscillating power of the 3-ph ES for the first time. A detailed analysis of the use of 3-ph ES is included for providing multiple control objectives of voltage regulation and power balancing of the 3-ph power system, and minimization of the average and oscillating ac power of the ES. A corresponding control scheme implementable in a single controller is included and explained. The control scheme has been practically verified with experiments.
Chakravorty D, Akhtar Z, Chaudhuri B, et al., 2016, Comparison of primary frequency control using two smart load types, ISSN: 1944-9925
© 2016 IEEE. Primary frequency control using smart loads with reactive only compensation (SLQ) has been shown in the past. In this paper, further improvement in frequency regulation is shown using smart loads with a back-to-back converter (SLBC) arrangement. This introduces additional flexibility and thereby, allows independent and wider control over active and reactive power consumption of the smart load. The improvement in frequency regulation with SLBCs is compared against SLQs through two separate case studies on 4-generator, 2-area test system and also the 39-bus New-England test system. A future scenario with reduced system inertia is considered for both case studies. Unlike previous exercises involving smart loads, in this study a detailed representation is used for both the multi-machine transmission system and the distribution networks down to the medium voltage (MV) level where the smart loads (SLBC/SLQ) are connected. This avoids the inaccuracies associated with load aggregation or use of system equivalents wherein the network constraints, spatial voltage variations etc. are not captured properly.
Martinez-Sanz I, Chaudhuri B, Junyent-Ferre A, et al., 2016, Distributed vs. Concentrated Rapid Frequency Response Provision in Future Great Britain System, IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
Sanz IM, Chaudhuri B, Strbac G, 2016, Coordinated Corrective Control for Transient Stability Enhancement in Future Great Britain Transmission System, 19th Power Systems Computation Conference (PSCC), Publisher: IEEE
Akhtar Z, Chaudhuri B, Hui SYR, 2015, Primary Frequency Control Contribution From Smart Loads Using Reactive Compensation, IEEE TRANSACTIONS ON SMART GRID, Vol: 6, Pages: 2356-2365, ISSN: 1949-3053
Luo X, Akhtar Z, Lee CK, et al., 2015, Distributed Voltage Control with Electric Springs: Comparison with STATCOM, IEEE TRANSACTIONS ON SMART GRID, Vol: 6, Pages: 209-219, ISSN: 1949-3053
Pipelzadch Y, Chaudhuri B, Green TC, et al., 2015, Role of Western HVDC Link in Stability of Future Great Britain (GB) Transmission System, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, ISSN: 1944-9925
Pipelzadeh Y, Moreno Vieyra R, Chaudhuri B, et al., 2015, Role of Smart Grid Technology and Corrective Control in Enhancing Network Capacity Utilisation in Great Britain with HVDC links, CIGRE SYMPOSIUM, Publisher: CIGRE
A range of advanced, technically effective and economically efficient corrective (or postfault) actions has been proposed to release latent transmission network capacity of the existing system and thus reduce network congestion and accommodate increased connection of low-carbon generation. Although the increased use of corrective control that can manage post-fault transmission overloads has proven to be clearly beneficial from an economic perspective, there are concerns related to the consequent stability (angular and voltage) of transmission systems. In this context, this paper demonstrates various corrective control measures (that can be undertaken by Special Protection Schemes –SPS–) including rapid response of generation and demand against double line outages (N-2) under extremely high power transfer conditions. To demonstrate these benefits, case studies are carried out on a detailed (full) dynamic system model of the Great Britain (GB) transmission network in DIgSILENT, which includes the Western Line-Commutated Converter based High Voltage Direct Current (LCC-HVDC). The value of corrective control measures, based on generationand demand response accompanied by Transient Assistive Measures (TAM) such as rapid changes in DC power order to improve system stability is demonstrated. It is shown that such measures can significantly increase the power transfers through the England-Scotland inter-connector while maintaining N-2 security. Moreover, it is demonstrated that although a generation ramp up/down response is naturally slower than a step-change tripping action over generation and demand (tripping actions are preferred in SPS) and therefore more prone to transient instability problems, generation-only operational measures can be deployed to deal with double circuit (N-2) outages under extremely high power transfers, given that the right portfolio of TAM is deployed. Thus TAM can effectively enhance the set of correctivecontrol measures considered b
Sanz IM, Chaudhuri B, Strbac G, et al., 2015, Corrective Control through Western HVDC link in Future Great Britain Transmission System, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, ISSN: 1944-9925
Sevilla FRS, Jaimoukha IM, Chaudhuri B, et al., 2015, A Semidefinite Relaxation Procedure for Fault-Tolerant Observer Design, IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 60, Pages: 3332-3337, ISSN: 0018-9286
Yan S, Tan S-C, Lee C-K, et al., 2015, Electric Springs for Reducing Power Imbalance in Three-Phase Power Systems, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 30, Pages: 3601-3609, ISSN: 0885-8993
Arif J, Ray S, Chaudhuri B, 2014, Multivariable Self-Tuning Feedback Linearization Controller for Power Oscillation Damping, IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 22, Pages: 1519-1526, ISSN: 1063-6536
Chaudhuri B, Hui SYR, Chaudhuri NR, et al., 2014, A power compensator, WO2013153075 A3
A power compensator for compensating voltage at a location along a power transmission line, the compensator having a controller for controlling a voltage generated across the compensator, wherein the voltage is controlled to maintain a power transmission line voltage at a value dependent on the power transmission line location.
Chaudhuri N, Chaudhuri B, Majumder R, et al., 2014, Multi-terminal Direct-Current Grids, Publisher: Wiley IEEE, ISBN: 9781118729106
Commercial unavailability of efficient DC side fault current interruption technology for conventional voltage sourced converter systems This book addresses the first issue in details by presenting a comprehensive modeling, analysis and ...
Sanz IM, Chaudhuri B, Strbac G, 2014, Frequency Changes in AC Systems Connected to DC Grids: Impact of AC vs. DC Side Events, IEEE PES General Meeting, Publisher: IEEE, ISSN: 1944-9925
Sanz IM, Chaudhuri B, Strbac G, 2014, Inertial Response From Offshore Wind Farms Connected Through DC Grids, IEEE Transactions on Power Systems, Vol: 30, Pages: 1518-1527, ISSN: 0885-8950
Sevilla FRS, Jaimoukha I, Chaudhuri B, et al., 2014, Fault-tolerant control design to enhance damping of inter-area oscillations in power grids, INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 24, Pages: 1304-1316, ISSN: 1049-8923
Arif J, Ray S, Chaudhuri B, 2013, MIMO feedback linearization control for power systems, INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS, Vol: 45, Pages: 87-97, ISSN: 0142-0615
Chaudhuri NR, Chaudhuri B, 2013, Adaptive Droop Control for Effective Power Sharing in Multi-Terminal DC (MTDC) Grids, IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 28, Pages: 21-29, ISSN: 0885-8950
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