Efficiency Modelling and Analysis of Multi-bus Microgrid with Transmission Network

Energy efficiency of microgrids with multiple paralleled inverters is becoming an important concern. In a multi-bus microgrid, the transmission network and load profiles complicate the system efficiency characteristic. This paper presents an efficiency modelling and analysis method for multi-bus microgrids with transmission network. The efficiency model of multi-bus microgrid is first established to analyze the dynamic efficiency characteristic under different load power distribution and load locations. Then, the optimum operation conditions of microgrids are derived according to the established efficiency model by Lagrange Multiplier Method. Simulation results are provided to validate the proposed efficiency modelling and analysis method. The analysis results show that the optimum efficiency operation points are related with load power distribution and load locations in a multi-bus microgrid. The proposed power sharing method is able to improve the overall energy efficiency of multi-bus microgrid.