Research On Interface Algorithms Of Grid-Microgrid Hardware-in-the-Loop Simulation

The rapid development of renewable energy, distributed power generation and microgridhas been a problem of the electric power system. The new problems consists of gridstandards, the effect of the access of microgrid on grid, monitoring, control and regulationof the distributed energy, and operation control of the microgrid. Undoubtedly, theestablishment of a renewable energy and microgrid laboratory and the further research ofthe renewable energy, distributed energy and microgrid research on the platform, has animportant significance.The experimental methods of the power system consists of digital simulation andphysical simulation. Digital real-time simulation which uses the modern computertechnology, control technology, is a combination of large-scale software and complexhardware. It has unique advantages such as high modeling speed, less-costing, easy toadjust the parameter and simulation of large systems. The simulation model of physicalsimulation is based on the similarity theory. The physical model has taken into account theuncertainties of the nonlinear physical simulation. We can accurately simulate the dynamicprocess of the power system. The physical simulation can intuitively and reliably reflect theoperational status of the system. It is very convenient for the study of unclear phenomenonas well as the new control method and power equipment.In order to study the impact of micro-grid on the grid, we combine real-time digitalsimulation and physical simulation together. The real-time digital simulation is used tosimulate large scale grid. The physical simulation is used to model the microgrid. We usethe hardware-in-the-loop simulation technology to establish the grid-microgridhardware-in-the-loop simulation.This paper reviewed the existing hardware-in-the-loop simulation interface algorithms.Based on the ideal transformer model, we discussed the stability of the algorithm and howto improve the stability. Then we proposed the switching algorithm based on the idealtransformer model. We built a grid-microgrid hardware-in-the-loop simulation platform, didseveral research in the case of the symmetrical short-circuit fault, the asymmetricshort-circuit and load switching respectively. Compared with the digital simulation, weverify the correctness of the hardware-in-the-loop simulation interface algorithm.