Power Hardware-in-the-Loop testing for the Inverter-based Distributed Power Source
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1 Power Hardware-in-the-Loop testing for the Inverter-based Distributed Power Source Dipl.-Ing. Ziqian Zhang, BSc Univ.-Prof. Dipl.-Ing. Dr. Lothar Fickert Institute of Electrical Power Systems University of Technology Graz 1
2 Cyber-physical grids 2
3 Cyber-physics in power systems Influence from power electronics-based power source to grid Dynamic behavior No induction motor/generator load model No rotating equipment Very fast response-controlled current source Power Quality power fluctuations Harmonic wave Unstable of parallel sources Reaction of a power failure/interference 3
4 Power Electronic Hardware and software Power electronic components IGBT MOSFET over-current damage Software signal processing Control algorithm Program efficiency Bug 4
5 Power Hardware in the loop 5
6 Hardware in the loop Test Concept HIL = Hardware in the loop Why HIL Test? Cost Duration Safety Feasibility Test Environmental Real-time Simulation Simulator EUT 6
7 Power Hardware in the Loop The signal exchange between the EUT and an RTS is through high-power signals, the PHIL Interface is required. 7
8 PHIL Interface Algorithmus Z Sim Delay Transfer i EUT i Sim U s U Sim U EUT Z EUT Software Real-time simulation Delay Transfer Hardware Real world Z Sim is the grid impedance of the grid model Z EUT is the impedance of the real world I Sim is represents the influence of the EUT current upon the grid in the form of a current source. U EUT is the output voltage of the power amplifier. 8
9 Stability of PHIL The open loop transfer function of PHIL: With nyquist stability criterion can get: When, the system is stable. unstable stable 9
10 PHIL Laboratory Setup 10
11 Hardware-in-the-loop interface Setup The real-time simulator is the product from dspace. The output voltage of the PV cell is simulated by DC source (PV Simulator), and is supplied to the EUT (PV inverter). Output voltage of the power amplifier used to simulate the grid voltage. 11
12 Institut für Hardware-in-the-loop interface Setup in Laboratory DC Grid Simulator Measuring Equipment Univ.-Prof.Horst Dipl.-Ing. Dr Lothar Fickert Professor Cerjak, AC Power Amplifer Signal Collect EUT RTS Console EnInnov
13 PHIL Test 13
14 Test Grid Model PV inverter 14
15 Grid Retroactive Effects Non PHIL Test Without Grid Model PHIL test With Grid Model Voltage in V Voltage in V Current in A Current in A Time in s Time in s This EUT will increase the output current from 0A to the rated current (22A) in 15 seconds. When we set the output voltage of the AC source fixed at 230V, which is the non- PHIL test, the output voltage will not change with the increase of EUT current. In PHIL test with the above grid model, the output voltage will change with the increase of EUT current. 15
16 Test of the Low Voltage Ride Through Capability The voltage dip will be realized by a short circuit fault, its duration is 650ms. The fault point is 100m from the PCC and circuit breaker S1 is close. Voltage in V Current in A Time in s 16
17 Power Hardware-in-the-Loop testing for the Inverter-based Distributed Power Source Dipl.-Ing. Ziqian Zhang, BSc Univ.-Prof. Dipl.-Ing. Dr. Lothar Fickert Institute of Electrical Power Systems University of Technology Graz 17
18 Backup 18
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