Circuit Analogy Modeling and Co-Optimization of Energy-Layer and Operating Parameters-Layer of DIES with HCNG

This paper studies the co-optimization of energy-layer and operating parameters-layer for distributed integrated energy system (DIES) operation with Hydrogen compressed natural gas (HCNG). Firstly, a novel circuit analogy rule is presented to facilitate joint multi-energy calculations. Based on the nodal power equation and Kirchhoff's law, an equivalent circuit is built to model the DIES in both energy level and operating parameters level. Then, a co-optimization strategy of energy-layer and operating parameters-layer of DIES operation is built. The hourly set points of operating parameter H2 % of HCNG are optimized in the operating parameters-level cycle, while the power outputs of energy devices are optimized in the energy-level cycle. The two cycles are iteratively optimized in concert until the final optimization result is obtained. Results show that the proposed method can respectively reduce operation cost and carbon emission by 10.36% and 11.93% than natural gas flued DIES, and 8.99% and 4.36% at most than traditional optimal methods.