Testbed for Mitigation of Power Fluctuation on Micro-Grid
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1 10 th Carnegie Mellon Conference on The Electricity Industry Testbed for Mitigation of Power Fluctuation on Micro-Grid Presented by Xin Zhao UC San Diego April 1, 2015
2 Acknowledgements The project was sponsored by the California Energy Commission. UC San Diego Team Xin Zhao System Identification and Control Laboratory, UC San Diego Raymond de Callafon System Identification and Control Laboratory, UC San Diego Maurice van de Ven Eindhoven University of Technology William Torre Center for Energy Research, UC San Diego Chuck Wells Center for Excellence, OSIsoft OCC Team Greg Smedley One-Cycle Control Inc. Tong Chen One-Cycle Control Inc. 2of 20
3 Outline Introduction Testbed for mitigation of power fluctuation Overview Portable cabinet Controller Preliminary tests on the testbed Future work 3of 20
4 Introduction
5 Introduction Motivation for mitigation of power fluctuation Power fluctuation occurs intermittently on micro-grid. Conventional generation tends to stabilize and maintain synchronous operation of the system by the inertia in the form of spinning rotational mass. As more renewable energy generation is added to the utility grid, it could result in instability and poorly damped oscillations in AC frequency and power on micro-grid. 5of 20
6 Introduction Objectives of building a testbed Simulate a power fluctuation Motor load Oscillatory circuitry Detection of instantaneous fluctuations Phasor Measurement Unit (PMU) Instantaneous power sensor Verification of data-based dynamic modeling (system identification) techniques Damping controller design and implementation Embedded devices Capability of real-time control of an inverter An inverter with real-time active/reactive power control 6of 20
7 Testbed
8 Testbed Overview System diagram Inverter with real-time control PV System Controller Controller with implementation of instantaneous power calculation and damping control Sensors V V V Switch Circuit Breaker GRID EMI Filter Grid-Tied Inverter L1 L2 A A L3 Auxiliary Relay A R-L-C Load Circuit Overload Protection Contactor Oscillatory circuitry acting as a power fluctuation 8of 20
9 Testbed Key Components Portable cabinet Grid-Tied Inverter Controller Cabin Oscillatory R-L-C circuitry 9of 20
10 Testbed Key Components Controller Manufacturer: National Instruments Model: NI myrio-1900 Processor: Xilinx Z-7010 (Duo Core, 667MHz) Memory: (ROM) 256MB (DDR3) 512MB Wireless: IEEE b,g,n Analog Input: 12 bits 500 ks/s Analog Output: 12 bits 345 ks/s 10 of 20
11 Preliminary Tests
12 Preliminary Tests Test of simulating power fluctuation For safety consideration, a programmable DC power supply is installed for testing. The power fluctuation generated by the oscillatory circuitry is measured and modeled as follows: System Measurement Model Simulation 60 3-phase Real Power Time [sec] 12 of 20
13 Preliminary Tests Four-quadrant grid-tied inverter (GTI) Manufacturer: One-Cycle Control (OCC) Model: GTI3100A6208/3652IR-PQ Max. Power: 36kW AC Voltage Range: 208V ±10% Rated DC Voltage: 365VDC Max. AC/DC Current: 100Arms / 100A Weight: 65lb Size: 23in 17.5in 5.25in 13 of 20
14 Preliminary Tests Capability test of real-time active/reactive power control Dynamic response of the OCC-GTI is tested with a step control input. The OCC-GTI is capable to be controlled in real time Real Power Step Input to GTI Time (sec) 14 of 20
15 Preliminary Tests Verification of data-based system identification on the GTI output Based on the measured data obtained by previous tests, a low-order model built within Prediction Error (PE) framework is capable to capture the dynamics Measured Result Simulated Result 3-phase Real Power Time [sec] 15 of 20
16 Preliminary Tests Verification of data-based system identification on the disturbance Dynamic response of the oscillatory circuitry is tested. A low-order model built by Step-Based Realization (SBR) method is capable to capture the dynamics well Measured Result Simulated Result 60 3-phase Real Power Time [sec] 16 of 20
17 Preliminary Tests Damping control algorithm design and implementation A preliminary damping control algorithm is designed based on modeling of the system described previously. The control algorithm is implemented in the controller. Control Algorithm Design Control Algorithm Implementation Open-Loop Simulation Closed-Loop Simulation No Control With Feedback Control Phase Real Power Phase Real Power Time [sec] Time [sec] 17 of 20
18 Preliminary Tests Conclusions The oscillatory circuitry in the testbed is able to simulate a power fluctuation. The grid-tied inverter provided by One-Cycle Control is capable to be controlled in real time. The controller is able to process the instantaneous power calculation and realtime control. The designed control algorithm is able to dampen the oscillation generated by the oscillatory circuitry. 18 of 20
19 Future Work
20 Future Work Large-scale integration tests Integration with Phasor Measurement Unit (PMU) Integration with photovoltaic (PV) systems Large-scale tests on UCSD micro-grid 20 of 20
21 Thank you
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