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A HARDWARE GRID SIMULATOR TO TEST GRID-CONNECTED INVERTER SYSTEMS

A HARDWARE GRID SIMULATOR TO TEST GRID-CONNECTED INVERTER SYSTEMS. ARUN KARUPPASWAMY B DR.VINOD JOHN Power Electronics Group Department of Electrical Engineering Indian Institute of Science, Bangalore. GRID SIMULATOR – AN INTRODUCTION. What?

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A HARDWARE GRID SIMULATOR TO TEST GRID-CONNECTED INVERTER SYSTEMS

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  1. A HARDWARE GRID SIMULATOR TO TEST GRID-CONNECTED INVERTER SYSTEMS ARUN KARUPPASWAMY B DR.VINOD JOHN Power Electronics Group Department of Electrical Engineering Indian Institute of Science, Bangalore NATIONAL POWER ELECTRONICS CONFERENCE

  2. GRID SIMULATOR – AN INTRODUCTION What? Grid simulator is a high power inverter controlled to simulate the effects (voltage sag, voltage swell, frequency variation and the like) generally observed in a grid. Why? • To test grid connected systems developed in the lab – under actual grid conditions • Variable voltage sources do not help as they do not include the line impedance NATIONAL POWER ELECTRONICS CONFERENCE

  3. A LITTLE MORE DETAIL A Typical Grid Disturbance NATIONAL POWER ELECTRONICS CONFERENCE

  4. L L L L From Grid DC Bus INVERTER C C FEC To Load Grid Impedance GRID SIMULATOR HARDWARE SETUP The system is controlled to imitate the grid along with its line impedance. Various grid disturbances can be emulated to test systems that are connected to the grid. NATIONAL POWER ELECTRONICS CONFERENCE

  5. EMULATION OF IMPEDANCES Reference Voltage for Inverter: Resistance Drop: Inductance Drop: NATIONAL POWER ELECTRONICS CONFERENCE

  6. + - Controller EMULATION OF INDUCTANCE Low Pass Filter Approach: State Estimation Approach: NATIONAL POWER ELECTRONICS CONFERENCE

  7. IMPLEMENTATION METHODOLOGY NATIONAL POWER ELECTRONICS CONFERENCE

  8. DSP RESULT – A THREE PHASE VOLTAGE SAG NATIONAL POWER ELECTRONICS CONFERENCE

  9. DSP RESULT – POINT OF WAVE EVENT NATIONAL POWER ELECTRONICS CONFERENCE

  10. DSP RESULT – EMULATION OF INDUCTANCE NATIONAL POWER ELECTRONICS CONFERENCE

  11. DSP RESULT – BANDWIDTH OF EMULATION NATIONAL POWER ELECTRONICS CONFERENCE

  12. CONCLUSION • The grid simulator is a useful and essential hardware that is required for projects on grid-connected systems. • The grid simulator can be useful to study the impact of events such as sags and swells, frequency variations and system faults on grid interactive converters such as STATCOM. • Issues in the development of the grid simulator would be the emulation of inductance and the hardware issues that might arise when testing the equipment under test like over currents leading to tripping of the Grid Simulator. • In this paper, impedance emulation has been discussed. Resistive and inductive impedances that characterizes the power system has been emulated in the DSP. • The same is in the process of being implemented using the 50kVA inverter that is being constructed. • The study on the DSP controller indicates that it is feasible to implement such a system. NATIONAL POWER ELECTRONICS CONFERENCE

  13. REFERENCES • IEEE Standard 1547.1, “IEEE Standard Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems”, IEEE, 2005. • Richard Zhang, Mark Cardinal, Paul Szczesny and Mark Dame, “A Grid Simulator with Control of Single-Phase Power Converters in D-Q Rotating Frame”, IEEE, 2002, pp 1431-1436 • National Renewable Energy Laboratory, Distributed Energy Resources Test Facility, http://www.nrel.gov/eis/test_facility_vtour.html • Gene F. Franklin, Michael L. Workman and David Powell, “Digital Control of Dynamic Systems”, 3rd Ed., Addison-Wesley Longman Publishing Co., Inc. NATIONAL POWER ELECTRONICS CONFERENCE

  14. DISCUSSION NATIONAL POWER ELECTRONICS CONFERENCE

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