2014 PV Distribution System Modeling Workshop: IEEE Test Feeders for Advanced Inverters Analysis: Jason Fuller, PNNL

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2014 PV Distribution System Modeling Workshop: IEEE Test Feeders for Advanced Inverters Analysis: Jason Fuller, PNNL

2014 PV Distribution System Modeling Workshop: IEEE Test Feeders for Advanced Inverters Analysis: Jason Fuller, PNNL

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  • 1. IEEE Test Feeders for Advanced Inverter Analysis JASON FULLER Pacific Northwest National Laboratory PV Distribution System Modeling Workshop 5/6/2014
  • 2. A little background… IEEE Distribution Test Feeder Working Group Under Distribution Analysis Subcommittee Informally started in 1991 with four radial test systems (fifth was added later) Original models were designed to benchmark unbalanced power flow solutions between tools NOT designed to test optimization algorithms NOT designed to test speed to solutions NOT designed to test network systems NOT designed to test “big” systems etc. New models were and are needed! 2
  • 3. 3 New test systems are being added 8500 Node Test Feeder (2010) Larger-scale to evaluate scalability of algorithms Real system with multiple voltage control devices Balanced and un-balanced versions Includes service drops (120/240 V) Courtesy of EPRI’s OpenDSS Comprehensive Test Feeder (2010) Designed to test models of standard components Cables, lines, transformers, regulators, induction machines, substations, sources, parallel lines, switches, triplex, quadraplex, etc. Tests convergence, especially under various switching schemes Courtesy of W.H. Kersting
  • 4. 4 New test systems are being added Neutral-Earth-Voltage Test Feeder (2010) Tests ability to determine NEV effects Multi-phase system with 4 circuits, neutral, and 4 telecom circuits on a pole Single- to three-phase laterals Pole and load grounds Substation neutral reactor Solved in multiple frequencies (3rd harmonic) Based on actual system near U.S. university Test Feeder for DG Protection Analysis (2011) Tests fault currents, voltages, etc. in presence of distributed generation With and without a utility source Multiple reclosers and fuses Based on actual 1.65 MW WT connected to a 12.47 kV feeder Courtesy of T.E. McDermott
  • 5. 5 New test systems are being added Short-circuit test cases (2012) Tests unbalanced short-circuit currents and voltages under given set of assumptions (no sequence components!) Results compared on original radial test feeders Additional models are needed for distributed generation and inverters! Network Test System (2014) First case is a small, 390-node system (ideal) Expanding to larger, more complicated ones Tests the effectiveness of solvers and algorithms on unbalanced, heavily meshed systems, including Low-voltage meshes Parallel transformers and cables Spot networks Normal and loss of primary feeder operations CourtesyofK.P.Schneider
  • 6. 6 In the works Time-series test case One-second resolution over a short time scale One-minute resolution over a longer time scale Load shapes to replace static loads (to include DG sources) Variety of voltage control modes Low voltage test case Large meshed network test case Inverter-based DG test case Microgrid test case Integrated transmission and distribution test case GridLAB-D simulation of 123-node with 30-second load shapes
  • 7. 7 Do we need an advanced inverter test feeder? The research community may be able to: Evaluate the interaction of existing and potential voltage control systems? Test the interaction of current and future protection schemes? Investigate islanding and/or ride-through behaviors during grid disturbances? Understand interactions with other advanced technologies (DR, VVO, etc.)? Evaluate business models, revenue recovery, and rate design to support investigation of alternatives?
  • 8. 8 What’s needed for an advanced inverter test case? Real (or realistic) feeder model with high penetrations Multiple voltage control devices (and settings / configurations) Unbalanced and balanced loading and generation Time-series load and generation data High- and low-resolution Agreed upon inverter performance model(s) and parameters With multiple control types (e.g., static PF, dispatched Q, local voltage control, etc.) Multiple testing regimes (steady-state, quasi- steady-state, transient / dynamic, etc.) “Effects of distributed energy resources on conservation voltage reduction”
  • 9. 9 How do we make a useful model? Hardware-in-the-loop? Hardware-in-the-Loop Two Advanced Inverters with PV located right after line regulator (80 kW each) Rest of system simulated 1-second synchronization / timesteps Courtesy of joint PNNL / NREL HIL Project
  • 10. Questions / Comments? 10