Double-Mode Optimal Control Strategy for Biomass/Wind/Diesel/Battery Stand-Alone Microgrid System: Steady-State Economic Operation Scheduling and Large Disturbance Emergency Power Control

摘要

Biomass resources are widely available and stored as green renewable energy, but biomass power generation (BPG) technology is rarely used in stand-alone microgrid (SAMG) systems in remote areas. In this paper, a two-mode optimal control scheme for biomass/wind/diesel/storage independent microgrid system is proposed, which includes economic operation scheduling under normal operation and emergency power control under large disturbances, based on the operation characteristics of distributed power supply. Diesel generating unit runs near the base point of higher power generation efficiency, absorbs the instantaneous fluctuation of net load, and provides the reserve capacity for system operation. The fluctuating output of the apparent net load of biomass power generation system can effectively cooperate with wind power to generate electricity and improve the permeability of renewable energy. A new control method of battery energy storage system (BESS) is proposed, which gives priority to emergency power control, followed by peak shaving and valley filling, reduces the allocation requirement of energy storage capacity and optimizes operation conditions. Aiming at an independent microgrid system in a remote community, simulation studies are carried out from two aspects, namely, quasi-steady-state-based system operation economy and transient stability in typical operation scenarios. The results show that the method is effective.