Projects
Projects: Projects for Investigator |
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| Reference Number | NIA_NGTO035 | |
| Title | Power Electronic Enabled Transformers (PEETs) | |
| Status | Completed | |
| Energy Categories | Other Power and Storage Technologies(Electricity transmission and distribution) 100%; | |
| Research Types | Applied Research and Development 100% | |
| Science and Technology Fields | ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100% | |
| UKERC Cross Cutting Characterisation | Not Cross-cutting 100% | |
| Principal Investigator |
Project Contact No email address given National Grid Electricity Transmission |
|
| Award Type | Network Innovation Allowance | |
| Funding Source | Ofgem | |
| Start Date | 01 October 2019 | |
| End Date | 01 April 2021 | |
| Duration | ENA months | |
| Total Grant Value | £835,000 | |
| Industrial Sectors | Power | |
| Region | London | |
| Programme | Network Innovation Allowance | |
| Investigators | Principal Investigator | Project Contact , National Grid Electricity Transmission (100.000%) |
| Industrial Collaborator | Project Contact , National Grid Electricity Transmission (0.000%) |
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| Web Site | https://smarter.energynetworks.org/projects/NIA_NGTO035 |
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| Objectives | The connection of BESS to the tertiary windings of transformers, while potentially imposing some additional constraints on the network, also provides the opportunity to exploit the versatility of the power electronics systems to alleviate risks imposed by the BESS and to further explore how the BESS systems could be used to benefit the wider network.This project proposes to investigate how tertiary connected BESS, or other power electronic based assets, can be used to facilitate the reduction of system level constraints.The combination of power electronics and transformers into a hybrid system is called Power Electronic Enabled Transformers (PEETs). PEETs are seen to provide the opportunity to:1. Remove thermal constraints from the network2. Uplift reverse power flow constraints3. Remove harmonic constraints and supress low frequency oscillations4. Help balance power system flows5. Increase emergency ratings of transformers6. Remove or reduce risks from tertiary connected BESS7. Influence local fault levelsThere are a number of different conceptual ways to alleviate various types of constraints imposed by a transformer, through the use of a PEET. This project will use specific NGET case studies to evaluate the potential that each conceptual design has to support the network and compare the performance of PEETs to a traditional network investment option. This project will investigate: 1, A range of novel PEET systems 2, Investigate the potential they offer to alleviating power system constraints.3, Review the impact that PEETs may have on the existing systems and propose methods to mitigate those risks; focusing on three areas:a. The impact on the existing transformer; from an electrical, thermal and magnetic point of view.b. System analysis with respect to voltage, power flow performance and fault levels. c. The impact on existing protection systems. The objectives are:1, To understand the potential benefits that can be achieved by using PEETs in the power systems2, To understand the risks thats PEETs pose to the network and what methods are available to mitigate those risks. | |
| Abstract | Power system constraint payments are one of the main economic drivers for investment in the network. These are based on the limitations of the system operation and the individual assets within each circuit. Being able to alleviate asset level constraints will result in system constraints being removed or reduced; with the end result being that constraint payments go down, reducing consumer bills.Transformer tertiary connections are presently used to connect Static Var Compensators (SVCs), and other voltage control technologies to the network. These voltage control systems are used to remove voltage constraints from the network.In the future, tertiary connections will be used to connect Battery Energy Storage System (BESS) to the transmission network. The connection of these additional loads to the transformer may also result in the transformer further limiting the network; due to the additional load. These additional loads have the potential to alter system voltages, affect fault levels, and interfere with ancillary service provision. This will be of particular concern with respect to local voltage regulation as the newly connected BESS will be able to absorb and inject reactive power locally at the transformer with potential impacts on tap-changer performance and control. Care must also be taken that neighbouring BESS do not interfere with each other.The connection of BESS to the tertiary windings of transformers, while potentially imposing some additional constraints on the network, also provides the opportunity to exploit the versatility of the power electronics systems to alleviate risks imposed by the BESS and to further explore how the BESS systems could be used to benefit the wider network.This project proposes to investigate how tertiary connected BESS, or other power electronic based assets, can be used to facilitate the reduction of system level constraints. | |
| Publications | (none) |
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| Final Report | (none) |
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| Added to Database | 09/11/22 | |
