Decoupling State Estimation for Microgrid Park of Integrated Energy

Abstract

In addition to the power network, the integrated energy system also includes other energy networks, such as heating and cooling networks, combined cooling, heating and power (CCHP) units, electric boilers, heating pumps and other coupling equipment with different properties. The traditional estimation method of power networks ignores the information from heating/cooling networks. To take into account the interconnections between the networks, this paper focuses on integrated energy system modeling and state estimation (SE) algorithm, and studies the relevant SE theories. To improve the estimation accuracy and reduce the computational complexity, based on the Weighted Least Squares (WLS) algorithm, the heating network - cooling network – power network SE is decoupled into several estimation processes with CCHP coupling alternating iterative constraint conditions. Thus, a decoupling SE method for microgrid park of integrated energy is proposed. Finally, the feasibility of the decoupling SE method and its advantages over the traditional SE method of the power network are verified by the simulations in a 59-node microgrid park with CCHP.