Effectiveness analysis of the average value modeling of microgrid
Compared with the transmission power grid, the microgrid tends to contain much more power electronic devices. In the transient simulation with large time scale, the use of detailed switching model of power electronic devices often leads to significant increase of the required computation time and memory overflow problems. To solve these problems, the average value modeling method is usually adopted to modeling the terminal characteristics of power electronic devices, where the variable voltages and currents of the devices are replaced by their average value within a switching cycle. In this paper, the average value modeling principle which lays the basis of the modeling of AC-DC, DC-DC and DC-AC converters is firstly studied. Then both the detailed and the average value models of a typical microgrid containing AC-DC, DC-DC and DC-AC converters are established and accuracy of average value modeling method is studied. Simulation results show that the average value model of the microgrid can accurately capture the dynamic characteristics of the grid with reasonable accuracy but largely reduced simulation time.