Project No.1. of the National Research Programme «LATENERGI»

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1 Project No.1. of the National Research Programme «LATENERGI» «Innovative power electronic technologies for increasing energy efficiency of industrial and household sectors in Latvia, future power supply grids and harvesting of renewable resources» «Inovatīvas energoelektronikas tehnoloģijas energoefektivitātes palielināšanai Latvijas tautsaimniecībā, nākotnes elektroapgādes tīkliem un atjaunojamo energoresursu izmantošanai» Project leader: Dr.habil.sc.ing., Leonids Ribickis Presented by: Dr.sc.ing. Oskars Krievs

2 Goal and Tasks of the Project The Goal of the Project The specific goal of the project is to elaborate recommendations and innovative power electronic technologies for: improving the energy efficiency of industrial objects, lighting systems and households in Latvia; integration of renewable sources in the distribution grid or local microgrids; quick charge points for electrical cars; power flow monitoring and control in the future electrical power supply grids of Latvia

3 Goal and Tasks of the Project The First Tasks of the Project 1. Technological solutions for introducing local micro-grids in industrial objects 2. Innovative power electronic and control technologies for increasing the lighting system efficiency (continuation on developments of the previous National Research Programme) 3. Power electronic converters for reactive power flow control to increase the efficiency of large power industrial objects 4. Technological solutions for integration of wind power into low voltage grids

4 Technological solutions for introducing local micro-grids in industrial objects micro-grid topologies for interfacing with AC grids Wind turbine Photovoltaic panel Recuperative load Active Front End AC AC 3Φ AC 400V 50Hz AC 600V TN-C system for low voltage systems mainly EDLC Battery pack Time varying load Due to vast development in Power Electronic technologies microgrid has become a feaible solution for increasing energy efficiency and integrating renewables in industrial or household objects Problems realted to grid standartization and protective device development must be solved

5 Technological solutions for introducing local micro-grids in industrial objects Analysis of micro-grid topologies for interfacing with threephase AC grids IT system - a System dc voltage value Vdc = 600V (based on standard: IEC 60038) Protection connection system IT-a (for low power) and IT-b (for high power) is preffered IT system - b Circuit breakers SF and disconnections SA choice most be based on standards: IEC IEC to IEC Fuses choice must be based on standard IEC PV connection system must be based on standard IEC Converter standards: IEC and IEC

6 Technological solutions for introducing local micro-grids in industrial objects commutation and measurement nodes Waveforms of IGBT switch gate control (yellow) and fault feedback (blue) signal testing. commutation device prototype power stage. Designed for current up to 40A, 600V nominal voltage. A laboratory prototype of safety communication device for disconnecting currents with limited overvoltage has been developed and is being tested

7 Technological solutions for introducing local micro-grids in industrial objects commutation and measurement nodes Prototypes of: An AC power measurement node utilizing a novel electrical energy calculation by means of summing of non-even time current samples over short time periods A power measurement node equipped with AnyBus communication node have been developed

8 Technological solutions for introducing local micro-grids in industrial objects Hybrid storage system and interfacing converter topologies First prototypes of LiFePO4 battery storage and interfacing converters for Hybrid storage system Prototypes of: LiFePO4 battery storage with active management system Buck-boost mode interfacing converters for Hybrid storage system have been developed

9 Technological solutions for introducing local micro-grids in industrial objects Interfacing AC/ active front-end converter Power topology and prototypes of control unit and power unit of active front-end converter Prototypes of control unit and power unit of active front-end converter have been developed and now are being tested for bidirectional power flow capabilyties and performance

10 Innovative power electronic and control technologies for increasing the lighting system efficiency Indoor lighting unit with integrated supply and dimmer modules LED driver integrated in LED PCB (for tubular lamps, switch mode). LED driver integrated in LED PCB (linear AC direct drive driver) Different integrated LED driver types and configurations (based in different control ICs) have been built and tested. The assessment of SiC diode performance in non-isolated switch mode converters for LED lighting applications has been done.

11 Innovative power electronic and control technologies for increasing the lighting system efficiency Far range lighting sensor for «smart» street lighting systems A hybrid long range passive sensory system based on both static (IR Photodiode) and non-static (PIR) sensors Intelligent street lighting, along with its immense energy saving potential, relies upon many factors, not least, the importance of maintaining useable levels of light for both vehicles and pedestrian traffic A far range optical sensor prototype has been developed capable of vehicle and human detection with a negligible degree of error

12 Power electronic converters for reactive power flow control Analysis of one-winding Magnetically Controlled Shunt Reactor Magnetically Controlled Shunt Reactor for applications in 6-35 kv grids modeled scheme of three phase TCR 50% of nominal power, from top: line current, phase current, line voltage Analysis and simulation of one-winding Magnetically Controlled Shunt Reactors (MCSR) dual model is done, explaining the principles of the MCSR dual scheme substitution with an equivalent thyristorcontrolled reactor. It is demonstarted that behavior of MCSR in electrical network is the same as behavior of TCR

13 Technological solutions for integration of wind power into low voltage grids Low speed wind generator test-bench A low speed generator test-bench is developed that allows wind turbine emulation at different wind speeds. The test-bench consists of turbine side drive system 7.5kW induction motor and frequency converter, torque and shaft speed transducer, test generator and generator s side converter. The developed low speed wind generator test-bench The test-bench can be used for permanent magnet generator as well as induction generator tests with rated power up to 2,5kW, maximum shaft speed 1500RPM, maximum shaft torque 100Nm

14 Technological solutions for integration of wind power into low voltage grids Integrated generator power electronic converter A - converter for integration with PMSG is developed and tested. Converter tests revile that: stable device operation is possible in power range from 60W to 2020W with 35% overload; device does not cause significant electromagnetic interference and does not interfere with other devices causing their failure; device is capable of providing stable output voltage in full load range Nr. Parametr Notation Unit Value 1. Otuput power P kw 2,0 2. Input AC voltage Vin V Max. input AC voltage Vin_max V Min. operating AC voltage Uin_min V Rated output voltage Uout V 400 +/-5% 8. Commutation frequency f_c khz Efficiency η % 98

15 Project Performance Indicators (period: ) Scientific performance indicators Number of original scientific articles (SCOPUS)(SNIP 1): 1 Number of original scientific articles in conference proceedings (SCOPUS): 10 Number of original scientific articles in conference proceedings (ERIH, IEEXplore and other international databases): 6 Number of defended doctoral thesis: 1 Number of defended master's thesis: 7 In dicators of the promotion of the programme Interactive events to promote the process and results of the programme: conferences: 2; seminars: 2; exhibitions: 1; popular-science publications: 1 Economic performance indicators Income from contractual jobs that are based on results and experience acquired in the framework of the programme: EUR Number of recommendations submitted for industry: 4 Human capacity indicators Number of developed international collaboration networks: 2

16 Thank You! Contacts: Dr.sc.ing. Oskars Krievs