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Power hardware in the loop testing is an extension of signal-level real-time simulation to the power level through the combination of a real-time simulator, a power amplifier and a device to be tested. It can be used to test real power devices, such as energy storage devices, photovoltaic devices, wind turbines and other power devices, and has the characteristics of flexible transformation of system topology and simulation of a variety of grid fault conditions.
MT 8020 simulator is used to simulate large power grid. The large grid bus voltage is output to the power amplifier through the analogue port of the simulator, and thus controlling the output voltage of the power amplifier in real time. The power amplifier output is connected to the microgrid AC bus. Current measurement unit collects the current between the microgrid and the power amplifier and then feeds it back to the HIL simulator to correlate the power with the power grid. This forms a closed-loop real-time simulation structure which includes a real microgrid and a virtual large power grid.
Equipped with 8-core Intel Xeon 3.8GHz CPU, to realize real-time simulation based on CPU with minimum 50μs timestep.
Equipped with Xilinx UltraScale FPGA, to realize real-time simulation based on FPGA with minimum 250ns timestep.
Support MODBUS TCP, MODBUS RTU,CAN, ETHERNET TCP, ETHERNET UDP, GOOSE, serial port and other specialized protocols.
Compatible with mainstream modeling software, without FPGA programming and compilation.
When a sudden change in the load of the large grid causes fluctuations in the bus voltage, the voltage of the microgrid varies with the change in the large grid. The microgrid performance during the change can be analysed and studied. In the figure, the virtual large power grid is suddenly added 50MW, causing bus grid fluctuation, and the actual microgrid voltage changes.
When the power of the microgrid changes, the PHIL host computer interface will display the waveform of the energy flow change between the large power grid and the microgrid in real time.
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