Imperial College London

ProfessorTimGreen

Faculty of Engineering

Director of the Energy Futures Laboratory (EFL)
 
 
 
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Contact

 

+44 (0)20 7594 6171t.green Website CV

 
 
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Assistant

 

Ms Beata Cypcar +44 (0)20 7594 5865

 
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Location

 

Energy Futures Lab, Electrical Eng BuildingElectrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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334 results found

Gu Y, Bottrell N, Green TC, 2018, Reduced-Order Models for Representing Converters in Power System Studies, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 33, Pages: 3644-3654, ISSN: 0885-8993

JOURNAL ARTICLE

Judge PD, Chaffey G, Merlin MMC, Clemow PR, Green TCet al., 2018, Dimensioning and Modulation Index Selection for the Hybrid Modular Multilevel Converter, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 33, Pages: 3837-3851, ISSN: 0885-8993

JOURNAL ARTICLE

Judge PD, Merlin MMC, Green TC, Trainer DR, Vershinin Ket al., 2018, Thyristor-Bypassed Submodule Power-Groups for Achieving High-Efficiency, DC Fault Tolerant Multilevel VSCs, IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 33, Pages: 349-359, ISSN: 0885-8977

JOURNAL ARTICLE

Merlin MMC, Soto-Sanchez D, Judge PD, Chaffey G, Clemow P, Green TC, Trainer DR, Dyke KJet al., 2018, The Extended Overlap Alternate Arm Converter: A Voltage-Source Converter With DC Fault Ride-Through Capability and a Compact Design, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 33, Pages: 3898-3910, ISSN: 0885-8993

JOURNAL ARTICLE

Wang B, Wang X, Wang X, Shao C, Judge PD, Green TCet al., 2018, An Analytical Approach to Evaluate the Reliability of Offshore Wind Power Plants Considering Environmental Impact, IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, Vol: 9, Pages: 249-260, ISSN: 1949-3029

JOURNAL ARTICLE

Xiang X, Zhang X, Chaffey GP, Green TCet al., 2018, An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application, IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 33, Pages: 508-519, ISSN: 0885-8977

JOURNAL ARTICLE

Xiang X, Zhang X, Luth T, Merlin MMC, Green TCet al., 2018, A Compact Modular Multilevel DC-DC Converter for High Step-Ratio MV and HV Use, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 65, Pages: 7060-7071, ISSN: 0278-0046

JOURNAL ARTICLE

Zhang X, Xiang X, Green T, Yang X, Wang Fet al., 2018, A Push-Pull Modular Multilevel Converter Based Low Step-Up Ratio DC Transformer, IEEE Transactions on Industrial Electronics, ISSN: 0278-0046

CCBY A non-isolated dc-dc converter with chain-links of sub-modules (SMs) is proposed in this paper. The converter can perform as a dc transformer with low step-up ratio. To demonstrate the step-up dc-dc conversion, the converter is operated in resonant conversion mode, achieving soft-switching and inherent-balancing of SM capacitor voltages. The circuit configuration is presented and the operation principle is analyzed in the paper. Experimental results based on a downscaled prototype validate the performance of the proposed converter as a low step-up ratio dc transformer. The converter also exhibits a good linearity covering a broad range.

JOURNAL ARTICLE

Bottrell N, Lang P, Green T, 2017, Algorithm for soft open points to solve thermal and voltage constraints in low-voltage distribution networks, Pages: 1567-1570

© 2017 The Institution of Engineering and Technology. All rights reserved. Thermal and voltage constraints in the low-voltage network (0.4 kV) may become more prevalent if increase in load or increase in distributed generation occur. Typically, constraints in the distribution network are solved by replacing the transformer, replacing the feeders, or installing a new substation. One solution to avoid these costly reinforcements is to utilise power electronics. The UK Power Networks project called Flexible Urban Networks-Low Voltage explored the use of connecting multiple feeders with power electronics. This study reports on the design of the control algorithm and demonstrates the operation by presenting field trial results.

CONFERENCE PAPER

Chaffey G, Green TC, 2017, Low speed protection methodology for a symmetrical monopolar HVDC network

Protecting a future HVDC network from short circuit DC faults is presently expected to require extensive implementation of fast HVDC circuit breakers, allowing for rapid fault isolation. The requirement for circuit breakers may, however, be reduced or removed depending on the protection methodology, resulting in a slower post-fault recovery. The expected fault response and the subsequent network recovery is dependent on the circuit breaker, network, and converter configurations. This paper examines a low speed protection methodology for a symmetrical monopolar HVDC system, a configuration which requires pole to pole balancing following a pole to ground fault. The fault clearance and network recovery timings are therefore evaluated for both pole to pole and pole to ground faults on several case study networks.

CONFERENCE PAPER

Gu Y, Bottrell, Green, 2017, Reduced-Order Models for Representing Converters in Power System Studies

Matlab codes of reduced-order models for representing power electronic converters in power system analyses.

SOFTWARE

Guo J, Liang J, Zhang X, Judge PD, Wang X, Green TCet al., 2017, Reliability Analysis of MMCs Considering Submodule Designs with Individual or Series-Operated IGBTs, IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 32, Pages: 666-677, ISSN: 0885-8977

JOURNAL ARTICLE

Lachichi A, Junyent-Ferre A, Green T, 2017, Power Converters Design for Hybrid LV ac/dc Microgrids, 6th IEEE INTERNATIONAL CONFERENCE on RENEWABLE ENERGY RESEARCH and APPLICATIONS (ICRERA 2017), Publisher: IEEE, Pages: 850-854, ISSN: 2377-6897

CONFERENCE PAPER

Mendonca TRF, Collins ME, Pinto MF, Green TCet al., 2017, Decentralisation of power flow solution for facilitating active network management, Pages: 1669-1672

© 2017 The Institution of Engineering and Technology. All rights reserved. The rapid growth in connections of distributed energy resources (DER) is leading to constrains in distribution networks that were not designed with this in mind. The required traditional reinforcement is expensive and so network operators and utilities have sought to use active network management (ANM) as a more effective approach. However, ANM as often proposed relies on a centralised data acquisition and control scheme, which is a challenge if the numbers of DER across the distribution network are very large. In order to avoid these undesirable features, efforts have been directed into decentralising ANM. This study presents a decentralised power flow solution that reduces centralised calculations and facilitates ANM. The formulation of the algorithm and the approximations it rests on are described. Simulation results demonstrate that errors in estimating voltages and power flows due to non-local changes in power flow are as small as 0.1%.

CONFERENCE PAPER

Merlin MMC, Judge PD, Chaffey G, Wylie J, Green TCet al., 2017, Soft-switching of the director switch in the alternate arm converter using blocked sub-modules, 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics, COMPEL 2017

© 2017 IEEE. The presence of Director Switches (DS) in its arms enables the Alternate Arm Converter (AAC) to generate smooth current waveforms while using a reduced number of Sub-Modules (SMs) when compared to the Modular Multilevel Converter. To maximise the power efficiency of the AAC and simplify the DS design, it is highly beneficial to soft-switch the DS. This paper presents a method which reliably ensures their soft-switching operation using the blocked state of SMs during the non-conducting part of the cycle of an arm. Experimental results demonstrate the effectiveness of the proposed method over a wide range of operating conditions.

CONFERENCE PAPER

Pipelzadeh Y, Chaudhuri NR, Chaudhuri B, Green TCet 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

JOURNAL ARTICLE

Pipelzadeh Y, Moreno R, Chaudhuri B, Strbac G, Green TCet 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

JOURNAL ARTICLE

Sang Y, Junyent-Ferre A, Green TC, 2017, Transformer Design in a Medium Voltage DC/DC Converter for a DC Collection Network, 19th European Conference on Power Electronics and Applications (EPE ECCE Europe), Publisher: IEEE, ISSN: 2325-0313

CONFERENCE PAPER

Sanz IM, Judge PD, Spallarossa CE, Chaudhuri B, Green TCet al., 2017, Dynamic Overload Capability of VSC HVDC Interconnections for Frequency Support, IEEE TRANSACTIONS ON ENERGY CONVERSION, Vol: 32, Pages: 1544-1553, ISSN: 0885-8969

JOURNAL ARTICLE

Sanz IM, Judge PD, Spallarossa CE, Chaudhuri B, Green TC, Strbac Get al., 2017, Effective Damping Support through VSC-HVDC Links with Short-Term Overload Capability, IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), Publisher: IEEE, ISSN: 2165-4816

CONFERENCE PAPER

Wang B, Wang X, Bie Z, Judge PD, Wang X, Green TCet al., 2017, Reliability Model of MMC Considering Periodic Preventive Maintenance, IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 32, Pages: 1535-1544, ISSN: 0885-8977

JOURNAL ARTICLE

Wylie J, Merlin MC, Green TC, 2017, Analysis of the Effects from Constant Random and Wear-out Failures of Sub-modules within a Modular Multi-level Converter with Varying Maintenance Periods, 19th European Conference on Power Electronics and Applications (EPE ECCE Europe), Publisher: IEEE, ISSN: 2325-0313

CONFERENCE PAPER

Xiang X, Zhang X, Chaffey GP, Gu Y, Green TCet al., 2017, The Isolated Resonant Modular Multilevel Converters with Large Step-ratio for MVDC Applications, IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), Publisher: IEEE, ISSN: 2151-0997

CONFERENCE PAPER

Zhang X, Xiang X, Green TC, Yang Xet al., 2017, Operation and Performance of Resonant Modular Multilevel Converter With Flexible Step Ratio, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 64, Pages: 6276-6286, ISSN: 0278-0046

JOURNAL ARTICLE

Beddard A, Sheridan CE, Barnes M, Green TCet al., 2016, Improved Accuracy Average Value Models of Modular Multilevel Converters, IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 31, Pages: 2260-2269, ISSN: 0885-8977

JOURNAL ARTICLE

Beddard A, Wang W, Barnes M, Green PR, Beddard A, Green TCet al., 2016, Impact of Parameter Uncertainty on Power Flow Accuracy in Multi-terminal Systems, IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925

CONFERENCE PAPER

Bloemink JM, Green TC, 2016, Required VSC Efficiency for Zero Net-Loss Distribution Network Active Compensation, 7th IEEE International Symposium On Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759

CONFERENCE PAPER

Cao W, Wu J, Jenkins N, Wang C, Green Tet al., 2016, Operating principle of Soft Open Points for electrical distribution network operation, APPLIED ENERGY, Vol: 164, Pages: 245-257, ISSN: 0306-2619

JOURNAL ARTICLE

Cao W, Wu J, Jenkins N, Wang C, Green Tet al., 2016, Benefits analysis of Soft Open Points for electrical distribution network operation, APPLIED ENERGY, Vol: 165, Pages: 36-47, ISSN: 0306-2619

JOURNAL ARTICLE

Chaffey G, Judge PD, Merlin MMC, Clemow PR, Green TCet al., 2016, DC Fault Ride Through of Multilevel Converters, IEEE Energy Conversion Congress and Exposition (ECCE), Publisher: IEEE, ISSN: 2329-3721

CONFERENCE PAPER

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