A strategy development for optimal generating power of small wind-diesel-solar hybrid microgrid system

Abstract

The optimal control problem of wind-diesel-solar hybrid microgrid system to efficiently operate the system of distributed power sources, one side can take advantage of wind power and solar power with very small operating costs (can be considered as zero) can be stored in electricity storage, on the other hand optimizing the generation of diesel generators with high operating costs. Economic operation of the power system becomes more complicated because of uncertainty such as the distribution of power during peak and off peak hours, renewable energy sources (wind, sun) depend on unusual weather. Therefore, the problem of optimal power control is a process control problem in which the power balance between the load and the source is in a fixed mode. This paper focuses on developing the optimal power generation strategy of wind-diesel-solar hybrid generation system integrating energy storage system using the dynamic planning method in case the diesel generator operates normally. The results showed that the generating power of diesel engine generator units, the charging / discharging power of the inverter in the system, including two diesel generators, always followed the penetration of wind and solar power and fluctuation of load with an acceptable tolerance, namely less than 5%.