Power Electronics in Distribution Networks. IET, Savoy Place 30 th November 2016

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1 Power Electronics in Distribution Networks IET, Savoy Place 30 th November 2016

2 Presenter - overview Mr. Mark Coulthard Project engineer/manager with Scottish and Southern Electricity Networks (SSEN); Power electronics, DC and AC engineer; Member of the Institution of Engineering and Technology; and Currently researching, implementing and testing innovative Tier 2 network storage solutions under NTVV* * New Thames Valley Vision 2

Scottish and Southern Electricity Networks - overview SSEN SSEN is a Distribution Network Operator (DNO); SSEN operates:- Scottish Hydro Electric Transmission (SHET); Scottish

3 Scottish and Southern Electricity Networks - overview SSEN SSEN is a Distribution Network Operator (DNO); SSEN operates:- Scottish Hydro Electric Transmission (SHET); Scottish Hydro Electric Power Distribution (SHEPD); Southern Electric Power Distribution (SEPD); Delivering electricity to 3.7m homes, offices and businesses; Regulated Asset Value of 3.21bn 3

New Thames Valley Vision - overview NTVV Bracknell and the

network only; To facilitate transition to low carbon

reinforcement; To understand power electronics and

4 New Thames Valley Vision - overview NTVV Bracknell and the surrounding Thames Valley area; Specific focus on the LV network only; To facilitate transition to low carbon technologies PV and EV, and reduce the need for traditional reinforcement; To understand power electronics and innovative energy storage; 25 battery storage systems have been deployed under NTVV 4

5 ESMU high level The ESMU was developed between SSEN and Electrovaya, based in Toronto Canada; The ESMU is a street side system consisting of two core cabinets Power Electronics Unit (PEU) and Energy Storage Unit (ESU); The PEU contains a four quadrant inverter, safety systems, control system and communications system; The ESU contains lithium ion storage batteries, Battery Monitoring System (BMS) and safety systems; and The ESMU was developed as a tactical, and modular, buffer to support the network during thermal and voltage constraints 5

6 ESMU front view 25 ESMUs installed during spring

7 ESMU design and specification The ESMU has the appearance of a typical modular telecommunications cabinet(s) system; An ESMU system consists of one PEU with scalable ESUs, and will be installed within amenity areas or pavements; The ESMU contains a four quadrant inverter, electrical protection, the ability to communicate with SSENs DMS (SCADA) system and battery storage; The ESMU can be installed or re-deployed within a relatively short time period; and The ESMU complies with the requirements of the LVD and EMC directives, and is CE marked 7

8 ESMU design and specification (continued) The ESMU can be easily connected to a LV network feeder cable; The ESMU will provide phase balancing support to the network; The ESMU will provide voltage regulation to the network, during PV generation or during EV loading, and The ESMU will provide support to the network during identified thermal or peak demands 8

9 ESMU network connection Charge ESMU lithium ion batteries when the sun shines; Discharge ESMU lithium ion batteries when customers want to charge their EVs 9

10 ESMU front view (internal components) PEU Protection (G59 and ground fault); Inverter; Cable connections to LV main ESU Battery Monitoring System Lithium Ion battery modules 10

11 ESMU transportation The ESMU cabinets and sub-assemblies can be transported using air, sea and road transportation, within suitable packaging; however The lithium ion battery modules are classified as class 9 hazardous materials under ADR*; Transportation of the modules will require the creation and implementation of specific processes, such as ADR registration of transportation vehicles and suitable training for all operatives *The European Agreement concerning the International Carriage of Dangerous Goods by Road 11

12 ESMU installation A DNO can install an ESMU with permitted development rights, under the Town and Country Planning Act 1990; An ESMU can be installed within a relatively short time period to enable a timely response to a network constraint; Through project learnings, engagement with the local authority, the land owner(s) and residents was paramount to the successful installation of all of the ESMUs; The transportation and installation of an ESMU, will require compliance with NRSWA and road opening procedures, respectively; The ESMU must be carefully positioned using a vehicle with a retractable crane, thus site access remains a consideration * The New Roads and Street Works Act 12

13 ESMU core assemblies The cabinet colour may Vary by location PEU cabinet; 2. PEU base assembly; 3. PEU transformers, 3 required; 4. PEU anchor base; 5. ESU cabinet; 6. ESU base assembly; 7. ESU anchor base; and 8. Lithium ion battery modules 13

14 ESMU commissioning and maintenance The first stage of commissioning is G59 and safety system(s) calibration and testing; The next stage of commissioning is local functional testing of the ESMU under laptop control; and The last stage of commissioning is end-to-end testing between the ESMU and SSENs SCADA system The 6 monthly maintenance of an ESMU is not onerous, mostly inspection regime(s), and dependent upon usage or SSENs asset management system 14

15 ESMU control and safety An ESMU can be monitored and controlled, as below, by:- Using a laptop, during inspection and testing; Using SSENs SCADA system under the control of an appointed engineer; or by Using SSENs SCADA system under the control of SSENs automated system ADDM* A comprehensive ESMU safety case, and associated processes and procedures have been developed Any ESMU has been designed and tested to be self protecting in the event of loss of communications with SSENs SCADA system, and will act upon critical alarms, such as unauthorised access by disconnecting from the network *ADDM will be detailed within the next slide 15

Energy Storage and Management Unit - ADDM ESMU ADDM control ADDM or Active Distribution Device Management ; A remote intelligent management server based system developed with project partner

16 Energy Storage and Management Unit - ADDM ESMU ADDM control ADDM or Active Distribution Device Management ; A remote intelligent management server based system developed with project partner University of Reading; ADDM utilises real time substation data, network feeder data and ESMU data, with the output(s), once verified, being used to instruct the ESMUs, individually or globally to reinforce the network ADDM architecture 16

17 Energy Storage and Management Unit - trials ESMU Trials ADDM trials are in progress and will be concluded shortly; During 2015 and throughout this year SSEN has undertaken the following ESMU trials:- Balancing load between phases; Network voltage support; Network thermal performance; and Network power quality 17

18 Energy Storage and Management Unit - learnings ESMU Learnings SDRC report 9.4d clearly details all of the ESMU trials and learning outcomes, to date although an ESMU will provide- Network functionality - phase balancing, network voltage support, network thermal support and network power quality; Smart control (ADDM) the platform and control algorithm works, with further refinement ongoing; Mechanical operation it remains possible to reduce the mechanical size of the ESMU, and rationalise the number of core assemblies; and Electrical operation it is possible to rationalise software protocols and reduce OEM sourced components, for better asset management 18

19 Energy Storage and Management Unit - summary ESMU Summary An ESMU is a scalable and modular system which will respond and support network constraints; The ESMU has been designed to be a network buffer, which may defer or remove the need for traditional reinforcement; An ESMU system can be deployed or re-deployed within a relatively short time period, with minimal disruption to the public; The ESMU complies with European Directives; and An ESMU system can be readily recycled, upon reaching end of service life 19

20 Energy Storage and Management Unit - SDRCs ESMU SDRC reports The previous slides provide a snapshot of an ESMU from specification through to automated control, although the SDRC reports, below, will provide further comprehensive information:- SDRC 9.4c Install 25 LV Connected Batteries; SDRC 9.8a (4) LV Network Storage ESMU Trials; and SDRC 9.4d Produce learnings from energy storage and power electronic deployment Thank you 20

21 Mark Coulthard SSEN/IET R

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