Energy Association of Pennsylvania Meeting. PECO Energy Utility Integrated Concord Microgrid Project. March 21, 2017

Transcription

1 Energy Association of Pennsylvania Meeting PECO Energy Utility Integrated Concord Microgrid Project March 21, 2017

2 Background 2 In October 2015 PECO introduced it s intention to develop a microgrid as part of it s System 2020 five year plan PECO evaluated many potential projects with a focus on providing critical goods and services to customers during extended outage periods. Projects were evaluated with a selection criteria that focused on; customer mix, reliability need, capacity need, surrounding population density, and area accessibility Conceptual designs of the four highest potential pilot opportunities were further developed and evaluated by performing formal feasibility and business case studies. The final four projects were re-ranked and the Concord Microgrid Project was selected The Concord Microgrid is a clustered microgrid design supporting 30 customer connections with a peak load of 8.6 MW and estimated cost of $35M. PECO filed a petition for allowance with the Pennsylvania PUC to construct the Concord Microgrid Project in May of 2016 In October of 2016, PECO withdrew it s microgrid filing with the PUC based on concerns around utility ownership of generation, business case challenges, project size and cost, and rate structure challenges PECO will enter into collaborative discussions with key stakeholders in an effort to obtain better alignment and move this project forward

3 Feasibility / Business Case Analysis 3 Feasibility Study Initial conceptual designs were optimized to provide maximum benefit and stakeholder appeal Base case and advanced case designs with additional customer involvement and more advanced technology were developed for each pilot Pocket reliability studies and root cause analysis were performed Post microgrid reliability improvements were estimated Load profile and consumption studies were done to estimate and optimize the generation mix Operational characteristics were identified Business Model Framework, Approach and Analysis Project challenges Base and advanced case functionality and economic performance Key financial and maintenance cost assumptions Business model inputs; cost, revenue, tax credits, and public funding Capital and O&M cost breakdowns Revenue opportunities / market participation Cash flow and NPV Customer reliability savings Interruption Cost Estimator LBNL ICE Model

4 Types of Microgrids 4 Source: EPRI

5 Utility Integrated Microgrid Design & Challenges 5 Each utility has it s own unique electrical distribution configuration In the case of the Concord Microgrid, the targeted public purpose customers are connected to five different circuits operating at 34kV and 4kV Each microgrid requires a common point of interconnection (POI) to enable islanding operation Creation of POI will require moderate to extensive distribution system reconfiguraton more costly than a campus style microgrid Customer selection and mix is a key selection criteria that has a huge impact on the electrical reconfiguration cost. Some projects that had a very favorable customer mix were removed from consideration because of the high complexity and cost of the electrical reconfiguration. Who s in and who s out? Aerial facilities within the microgrid footprint need to be hardened against storm damage

6 Project Approach / Phases 6 Establish firm goals and objectives prior to design Customer mix is a key selection criteria for a public purpose microgrid Systemic thinking achieves optimal operational & functional requirements

7 Microgrid Site Geographic Overview 7 Complex Green - Microgrid 1 Yellow - Microgrid 2 Privileged & Confidential Prepared at the Request of Counsel Not For Distribution

8 Concord Microgrid Project 8 NG Engine 1980 kw NG Engine 1980 kw NG Engine 1980 kw Ground Mount PV 500 kw Municipal Building, and Fire Station Microgrid MW Peak Shopping Center Shopping Center Hotel Hotel C C C C *EV Chargers C C Shopping Centers NG Engine 1980 kw Microgrid MW Peak NG Engine 1980 kw Retirement Home, Gas Station, Food, ATM, Sewage Plant *Li-Ion BESS 2x100 kw Li-Ion BESS 200 kw Shopping Center Shopping Center *Wind Turbine 160 kw *Roof-Top PV 260 kw Multiple Building Locations *Carport PV 74 kw *Rooftop PV Level 3 EV Chargers 930 kw Level 2 EV Chargers *Sited on Customer Property Customers include; medical and surgery centers, retirement community, township building, fire station, sewage plant, gas stations, supermarkets, convenience stores, restaurants, pharmacies, bank services, home improvement, hotels, shelter, and retail space Slide 8

9 Microgrid #1 Conceptual Single Line Diagram 9 34kV Circuit X Hotel Wholesale Store Healthcare Healthcare Hotel kw Healthcare Shopping Center Shopping Center Large Retailer Home Improvement Store Hotel kw SC Trans Grocery Office Supply Restaurant Shelter Slide 9

10 Microgrid #2 Conceptual Single Line Diagram 10 to MG1 34kV Circuit Y Main Grid POI RCLC Gas, Food, Wawa ATM 76.5kVA 10kW 1 Microgrid 1 ~700' ~4000' N/O MG Tie Switch RCLC RCLC Concord Sewage Sewage Plant 385kVA MG2 Generation Station 2*1.98MVA J162 Gas Engine 34kV/4.6kV Maris Grove kVA Retirement Home 250kW 1 LEGEND RCLC: Remotely Controllable Load Center POI: Point of Interconnection to Main Grid MG1: Cluster Microgrid 1 Border line of customer properties Aerial cable Underground cable NOTE 1 : Distributed Generation for Advanced Case

11 Operational & Design Overview 11 Peak generation capacity allows for full islanding without demand response Transition between all modes of operation Environmentally friendly renewable DER BESS to maintain high power quality - renewable smoothing, generator loading, loading shedding, and demand transitions Uninterruptible power supply for fire house, township building, and shelter Remotely controlled load centers to coordinate load block management and fault isolation Coordination with existing utility distribution automation schemes Protection and control coordination with utility for island and parallel operation Economic dispatch of DER during parallel operation Remote DMS control and monitoring from PECO Operations Control Center

12 Utility Integration of the Microgrid 12 Source: EPRI Integrated Grid

13 EPRI Microgrid Optimization Study 13 The objective of this study is optimize the current conceptual design One year of historical load profile is being used to optimize DER resource type and size to deliver optimal operational effectiveness and economic dispatch Data integrity and organization has been a challenge Load profile data is being organized in a nodal (load center) format to perform the analysis DER-CAM - Distributed Energy Resources Customer Adoption Model is the primary tool that is being used to perform this analysis Allows users to perform scenario analysis of system to optimize design Economic and environmental model of customer DER adoption Determine the optimal Microgrid configurations as well as operating strategies Developed at Lawrence Berkley National Lab in 2000 Aims to minimize the cost of operating on-site generation Other tools are also being used to provide additional insights

14 EPRI Microgrid Optimization Study 14 Challenges Extracting one year of Demand Data to develop an aggregate load profile for customers served by the microgrid Interval Mix (15 & 30 min) Variety of meter types Data gaps due to customer relocations and meter upgrades occurring within the sample data set Extracting existing infrastructure information need for power flow modeling. Conductor Type Impedance Lengths Nodes

15 EPRI Microgrid Optimization Project 15 Current Project Status Report is being finalized EPRI Deliverable DER-CAM scenario report for 4 seasons Power Flow Model (multi-node analysis) Cost/Benefit Analysis Recommended location and sizing of DERs Recommendation on load block size and sectionalizing options Project Objectives Further develop project and prepare for next phases; design, planning, and HIL Support DER-CAM tool development and enhancement for utility use Provide feedback on how to make tool more effective and user friendly Support EPRI s Integrated Grid Vision - process for taking a project from concept to execution

16 Utility Integrated Microgrid Challenges 16 Design Framework Selection of critical public purpose customers dispersed among disparate feeders and voltages Creation of Point of Common Coupling (PCC) Minimize foundational hardening and reconfiguration cost Contingency Management Demand Data Granularity Traditional utility analysis philosophy may not be adequate Readily available information lacks high resolution Customer-level analysis requires AMI infrastructure with adequate sampling rate Data repository access may be a challenge Island Mode Operational Pillars PA law mandated voltage band must be maintained 120V nominal (+/-5% for residential and +/-10% for commercial/industrial) Generation capacity must support total load for utility application Multi-customer coordination and integration of existing DERs must be considered Safety, Standards, Operating Practices Safe operation and new equipment will require testing, new construction standards, operating practices, and training Microgrid industry standards are under development

17 Microgrid / Utility Grid Integration Benefits 17 Benefits for Both Grids. The Utility Grid Benefits the Microgrid Enhances microgrid reliability by providing a reliable source of power Provides a low cost alternative to microgrid generation - DERMS platform enables economic dispatch and improves bottom line cost Provides demand (market) for renewable generation / promotes renewable penetration The Microgrid Benefits the Utility Grid Generation can be used to alleviate overloads on utility circuits dependent on electrical configuration and type of microgrid Microgrid generation at point of interconnection can be incorporated into existing utility grid distribution automation scheme (virtual tie circuit) to provide additional contingency and improved reliability

18 Closing Thoughts 18 Business cases for utility integrated microgrids focused on reliability and resiliency are challenging. Need to improve our ability to quantify savings associated with reliability, resiliency, public safety, and deferred investments. Need to educate key stakeholders on the value of the resiliency insurance policy analogy Regulatory framework needs to change to enable microgrids and DER applications Utility philosophies must adapt to properly conceive, implement, and successfully build & operate effective microgrids Operational approach moves from a reactive mode to a proactive / optimization mode Grid-connected and islanded modes of operation will result in different fault current levels traditional relay protective schemes will not be adequate Next steps for Concord are; preliminary design, planning, and hardware in the loop (HIL) simulation testing to evaluate dynamic system response and protection and control requirements