|XU Junjun,HU Qinran,ZHANG Tengfei,WU Zaijun.Coordinated state estimation for electricity and gas integrated system considering timing sequence of multi-energy flow operation[J].Electric Power Automation Equipment,2023,43(11):34-42
|关键词: 电-气互联综合能源系统 协同状态估计 时序性 量测时延融合 数值稳定性
|Coordinated state estimation for electricity and gas integrated system considering timing sequence of multi-energy flow operation
XU Junjun1, HU Qinran2, ZHANG Tengfei1, WU Zaijun2
1.College of Automation & College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
|The electricity and gas integrated energy system can realize multi-regional energy interaction flexibly, but the time-sequence unified elements such as information interaction barrier of its multi-energy subsystem and measurement delay etc. have negative effects on accurate monitoring and scheduling of system. Aiming at the different operation time-scales of multi-energy subsystem, the sequential cooperative estimation framework with unified time-scales is built, and considering the time-delay issue of the sample period for the multi-source measurement equipment, the concept of measurement time-delay fusion is introduced to the estimation framework to address the time-sequence discrepancy between the multi-source measurement data. The real-time estimation algorithm of integrated energy system based on modified Kalman filter is proposed. Avoiding the issue of estimation failure caused by the error propagation that is non-positive definite in progress of real-time estimation by the introduction of the enhanced alternating projection-based symmetric positive definite theory. The simulative results and comparison analysis show that the proposed coordinated state estimation strategy can realize the online accurate monitoring of the electricity and gas integrated energy system effectively, and the estimation results have greater numerical stability.
|Key words: electricity and gas integrated energy system coordinated state estimation timing sequence measurement delay fusion numerical stability