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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.
The PHIL structure is shown in picture. It consists of MT 8020 real-time simulator and microgrid platform.The real-time model of the large power grid is run in the HIL real-time simulator. The large grid bus voltage is output through the analogue IO port of the HIL simulator, and the power amplifier output voltage is controlled in real time by using the external input interface of the power amplifier. The power amplifier output is connected to the microgrid AC bus. The current measurement unit collects the current between the microgrid and the power amplifier and then feeds it back to the HIL real-time simulator and correlates the power with the main grid. This forms a closed-loop real-time simulation structure of a real microgrid and a virtual large grid.
Equipped with 6-core 4GHz Intel Xeon CPU, it is capable of real-time CPU-based simulation (minimum step size up to 25us).
Equipped with Xilinx UltraScale FPGA, it enables FPGA-based real-time simulation with small step sizes (down to 250ns).
Support high speed and wide voltage range (-25V, 25V) digital input, adapted to industrial inverter controller interface; support MODBUS TCP, MODBUS RTU, CAN, serial port and other professional power communication protocols, convenient to achieve information interaction with the controller.
Compatible with mainstream modelling and simulation software, no need for FPGA programming and compilation, rich IO interfaces, which can greatly improve the real-time operation efficiency of the user in the simulation test when constantly changing the model and modifying parameters. Simple aerial insertion observation interface, convenient for users to expand the analysis.
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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