Coordinated Scheduling of Micro-grid Combined Heat and Power Based on Dynamic Feedback Correction and Virtual Penalty Cost

Micro-grid combined heat and power (MCHP) can supply thermal energy and electricity simultaneously with high efficiency. The coordinated scheduling of MCHP can effectively ensure reliable energy supply and improve economic efficiency. This study proposes a coordinated scheduling strategy integrated dynamic feedback correction and virtual penalty cost to realize economics and stability of MCHP. A two-layer scheduling framework is adopted. In short-term scheduling, a dynamic feedback correction method is employed for micro gas turbine(MGT) and battery avoiding frequent startup and stop or long-term operation in lower power. In ultra-short-term scheduling, a virtual penalty cost method is suggested to balance the power deviations caused by renewable energy fluctuation. The virtual penalty acts to select the MGT or battery compensating for exceeded power. Ultra-short-term scheduling is adjusted around short-term scheduling results, and the two schemes are effectively connected via power constraints. Wind power abandonment is punished to increase renewable energy utilization. The coordinated scheduling results for MCHP demonstrate that the proposed method avoids the MGT frequent switching between startup and stop. The operation time and fuel consumption of the MGT are also significantly decreased. Moreover, the MGT and battery are adjusted reasonably maintaining energy balance, significantly reducing the operating cost of the MCHP.