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UNIFLEX PM
Advanced Power Convertors for Universal and Flexible Power Management in Future Electricity Networks
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Report detailing converter applications in Future European Electricity Network - UNIFLEX-PM project deliverable D2.1
The integration of large numbers of dispersed generation (DG) units into power systems as foreseen in the future will require many changes to the way systems operate. This presents a great number of challenges which have to be overcome before the move to full and effective integration of DG through an interconnected transmission network can be realised {as envisaged "New Unified European Electricity Grid" [1] document}.
Download this report to see the results of the work carried out as part of tasks 2.1 and 2.2 of Workpackage 2 of the UNIFLEX-PM project. This reports on:
- The main types of integrated decentralised units to be expected in future distribution networks; mainly wind turbines, PV, biomass CHPs etc. The characteristics of these distributed energy sources have been studied and how they will be used in different European counties. The electrical and control performance requirements have been determined for different system voltage levels, for example, at the consumer 240 V level or at the 10-20 kV level of a distribution system. The modular power electronic converter to be developed as part of the UNIFLEX-PM project to enable the connection of various DG sources at different level of capacity will be based on the results of this investigation
- The electrical and control performance requirements of power electronic converters needed to implement various energy storage systems has also been determined. A comparison between the different energy storage devices, e.g. the small capacity, quick responsive devices and the large capacity technology has also been investigated.
[1] EUR 20901 - New ERA for electricity in Europe, European Commission Directorate-General for Research, Office for Official Publications of the European Communities, Luxembourg, ISBN 92-894-6262-0.
Report on converter structures - UNIFLEX-PM project deliverable D3.1
Download this report to see the results of the work carried out as part of task 3.1 of Workpackage 3 of the UNIFLEX-PM project. This reports on:
- The technical issues for potential converter structures for UNIFLEX-PM project.
- Two converter structures, with DC-DC isolation and with DC-AC isolation were investigated and their performances compared.
- The theories of dq- control and mono-phase control were applied to these two structures. The converter system controls were subject to rigorous testing schemes in order to verify control strategies proposed. The obtained simulation results confirm the validity of controls proposed for UNIFLEX-PM project.
- This report also details limitations of the UNIFLEX-PM converter system.
- Based on the work done a decision on selection of suitable converter structure was made which will serve as the input for WP7.
Report on Control Strategies - Uniflex-PM Project Deliverable D5.1
Download this report to see the results of the work carried out in Workpackage 5 of the UNIFLEX-PM project. This reports on:
- Different control structures for the Uniflex-PM system. Four control strategies are considered namely; synchronous reference frame control, predictive control, stationary reference frame control with proportional resonant current controllers and natural reference frame control with proportional resonant current controllers. Special considerations are paid to grid voltage monitoring.
- The control strategies are evaluated under different power flow and grid conditions with special focus on abnormal situations that can occur in a typical medium voltage network e.g. unsymmetrical faults, large frequency excursions, phase-jumps, etc.
- The results from this deliverable will feed into the practical evaluation in WP7
Report on reliability models - UNIFLEX-PM project deliverable D6.1
Download this report to see the results of the work carried out as part of Workpackage 6 “Reliability and Economics” of the UNIFLEX-PM project. This reports on:
- The results of the activities carried out within Task 6.1 “Reliability data collection and customisation” (now completed) and task 6.2 “Reliability models development” which is still in progress.
- The report presents the reliability models of the basic components of the UNIFLEX-PM system and the results of the preliminary base reliability estimate for the whole application, achieved by a Reliability Block Diagram modelling approach.
- The results of a sensitivity analysis carried out to identify the most critical basic components (from the reliability point of view) are also provided.
- Finally the report presents the results of two further studies, namely the analysis performed to identify the impact of basic components wear out on the system performances, and the analysis carried out to investigate the effects deriving from the adoption of different redundancy strategies as far as the reliability of the whole application is concerned
Final report on reliability and impact – UNIFLEX-PM project deliverable D6.2
Deliverable D6.2 deals with the results of the activities carried out
as part of Task 6.2 and Task 6.3 of Workpackage 6 of the UNIFLEX-PM project.To download the report please click here. This reports on:
- Identification of a reference case for performing the impact analysis by comparison between the UNIFLEX-PM system and an already existing commercial architecture for similar applications, based on both the stochastic performances and the functionalities provided by the two solutions.
- Reliability performances estimate for both the UNIFLEX-PM system and the reference case through combinatorial models. Three different working conditions have been considered for the prediction, which has been performed taking also into account wear-out effects for some basic components.
- Analysis of the possible benefits deriving from the adoption of different architectural/technological solutions, as far as the reliability performances of the UNIFLEX-PM system are concerned; two redundancy strategies and the use of DC link film capacitors have been investigated.
- Availability performances estimate for both the UNIFLEX-PM system and the reference case in three different working conditions, utilising an ad-hoc developed software tool based on the Monte Carlo method.
- Analysis of the impact on the availability figures of logistic delays and of preventive maintenance policies for DC link electrolytic capacitors.
Report on Hardware Evaluation - UNIFLEX-PM project deliverable D7.2
Download this report to see the results of the work carried out as part of Workpackage 7 “Hardware Evaluation” of the UNIFLEX-PM project. This reports on:
- The implementation of the prototype UNIFLEX-PM converter
- The configuration of the testing facility for operation of the prototype converter at supply voltages of 415V and 3.3kV
- Operation of a two port converter up to a supply voltage of 3.3kV with asynchronous grid connections, bidirectional power flow, and independent control of power in the converter ports
- Evaluation of the performance of the two port converter operating at 3.3kV and up to 285kVA
- Comparisons of simulation work presented in WP3 (D3.1) with experimental work in an effort to validate these simulations.
UNIFLEX c/o Prof. Jon Clare, School of Electrical and Electronic Engineering,
University Park,
Nottingham,
NG7 2RD
Tel +44 (0)115 951 5356, Fax +44 (0)115 951 5616, Email: Jon.Clare@nottingham.ac.uk
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