Streamlined Method for Determining Distribution System Hosting Capacity Matthew Rylander EPRI April 20, 2015 © 2015 Electric Power Research Institute, Inc. All rights reserved. Overview Streamlined Method to Analyze Feeder Hosting Capacity for Distributed Generation –Why do we need it? –How does it work? 2 © 2015 Electric Power Research Institute, Inc. All rights reserved. Why do we need a Streamlined Method? PV Growth U.S. Annual PV Additions 3 Growth fueled by falling economics, Renewable Portfolio Standards (RPS), financing schemes, net energy metering, greenhouse gas (GHG) emissions reduction initiatives © 2015 Electric Power Research Institute, Inc. All rights reserved. Why do we need a Streamlined Method? Feeders 4 © 2015 Electric Power Research Institute, Inc. All rights reserved. Analysis Why do we need a Streamlined Method? Feeders Issues Voltage Protection Impact Loading Control Total DER Penetration 5 © 2015 Electric Power Research Institute, Inc. All rights reserved. Analysis Why do we need a Streamlined Method? Feeders Issues Scenarios Hosting Capacity Impact Below Threshold Analysis Impact Depends Impact Above Threshold Impact Uncontrolled DER Deployment Optimal DER Deployment Impact Threshold Total DER Penetration 6 © 2015 Electric Power Research Institute, Inc. All rights reserved. Why do we need a Streamlined Method? Feeders Issues Scenarios Hosting Capacity Impact Below Threshold Impact Depends Analysis Impact Above Threshold Feeders with Similar Characteristics 7 © 2015 Electric Power Research Institute, Inc. All rights reserved. Why do we need a Streamlined Method? Screens Load Screens 3.5 Minimum Hosting Capacity 15% of Maximum Load 3 2.5 MW 2 1.5 1 0.5 0 J1 R1 R2 R3 R4 T1 T2 G1 G2 G3 P1 P2 P3 P4 P5 D1 D2 D3 Feeder Too Conservative Not Conservative Enough 8 © 2015 Electric Power Research Institute, Inc. All rights reserved. What type of Streamlined Method is needed? Granular Repeatable Scalable Transparent Proven Available • Capture unique feeder-specific responses • As distribution feeders change • System-wide assessment • Clear and open methods for analysis • Validated techniques • Utilize readily available utility data and tools EPRI’s Streamlined Hosting Capacity 9 © 2015 Electric Power Research Institute, Inc. All rights reserved. Evolution of Streamlined Hosting Capacity Streamlined Hosting Capacity Detailed Hosting Capacity – Analysis performed in the Utility’s distribution software tool – Minutes compared to weeks – Entire system analyzed Correlation Assessment Streamlined Hosting Capacity 10 © 2015 Electric Power Research Institute, Inc. All rights reserved. What does the Streamlined Method look like? Interface with utility model in the utility platform to attain: – Voltage Profiles – Currents/Loading – Impedances – Topology Streamlined Hosting Capacity currently performed external to commercial software 11 © 2015 Electric Power Research Institute, Inc. All rights reserved. How does the Streamlined Method work on a feeder? Single System Hosting Capacity Substation Resistance from Source 12 © 2015 Electric Power Research Institute, Inc. All rights reserved. How does the Streamlined Method work on a feeder? Multiple Systems and Topology Hosting Capacity Substation Must Account for Feeder Topology Resistance from Source 13 © 2015 Electric Power Research Institute, Inc. All rights reserved. How does the Streamlined Method work on a feeder? Distributed Systems Hosting Capacity Substation Resistance from Source 14 © 2015 Electric Power Research Institute, Inc. All rights reserved. Feeder-Level Hosting Capacity Hosting Capacity Impact Below Threshold Optimal PV Deployment Impact Depends Impact Above Threshold Hosting Capacity Range NonOptimal PV Deployment Max HC Min HC Resistance from Source 15 © 2015 Electric Power Research Institute, Inc. All rights reserved. What does Feeder-Level hosting capacity look like? 16 © 2015 Electric Power Research Institute, Inc. All rights reserved. Outcomes of the Streamlined Hosting Capacity Analysis This is not a replacement for detailed studies but it does provide guidance to when detailed studies are necessary Questions Answered – Where is the “optimal” location for DER? – How much aggregate DER can a feeder host? – When my feeder changes, how is hosting capacity impacted? – What is the aggregate level of DER that can be accommodated at the substation level? – What amount of DER can be accommodated across my entire system? – What are the range of issues for accommodating DER across the entire distribution system? Substation Level = Overvoltage Thermal Loading Voltage Fluctuations Feeder Level Feeder Level Relay Coordination Feeder Level 17 © 2015 Electric Power Research Institute, Inc. All rights reserved. Relay Desensitization Final Thoughts… PV is coming Need efficient methods to plan for it Methods will continue to evolve – Consideration of existing distributed energy resources – Inclusion of other types of distributed energy resources – Advanced inverter capabilities 18 © 2015 Electric Power Research Institute, Inc. All rights reserved. Together…Shaping the Future of Electricity 19 © 2015 Electric Power Research Institute, Inc. All rights reserved. Minimum Hosting Capacity Comparison Multiple Issues for One Feeder Utility Class DER Residential/Commercial DER 20 © 2015 Electric Power Research Institute, Inc. All rights reserved. Minimum Hosting Capacity Comparison One Issue for Multiple Feeders Utility Class DER Residential/Commercial DER Preliminary Findings + Effectively identifies when lower hosting capacity values are found + Close match at low hosting capacity + More conservative result at higher hosting capacity + Comparable results for all potential issues + Effective for small-scale (customer-based) and large-scale (utility-sized) systems 21 © 2015 Electric Power Research Institute, Inc. All rights reserved. What about Distributed Residential/Commercial PV? Current Distribution 1.5 MW DER Distribution 1.5 MW 1.0 MW 1.5 MW 0.5 MW 1.0 MW 0.5 MW 1.5 MW DER Center 1 DER Center 2 DER Center 3 Location from Substation 1.5 MW 1.5 MW Impact Impact Threshold 1.0 MW 1.5 MW 0.5 MW Hosting Capacity Location from Substation DER Center 1 DER Center 2 DER Center 3 Location from Substation Location from Substation Notes + The streamlined method is not a stochastic analysis but the impacts from different possible DER deployments on the feeder are incorporated under the thousands of analyzed DER distributions. 22+ The impact is not typically linear. Only illustrated here for visualization purposes. © 2015 Electric Power Research Institute, Inc. All rights reserved. + Impact threshold for each issue is adjustable. Potential Issues Conservative Issues Optimistic No Issues Realistic Every Potential Issue has a Hosting Capacity that also Depends on… Power Extreme Boundary of Possible DER Distribution Characteristics Hosting Capacity with Lateral Diversity More Probable Boundary of Possible DER Distribution Characteristics Hosting Capacity Location from Substation Hosting Capacity Range Notes + Extreme bounds only possible with large pockets of DER either at the feeder head or end. + Probable bounds incorporate randomness in DER location across feeder. 23 + Lateral diversity indicates higher hosting capacity on DER across parallel laterals on the feeder. © 2015 Electricbased Power Research Institute,distributed Inc. All rights reserved.
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