热电联合网络状态估计

State Estimation for Combined Electricity and Heat Networks

热电联产可有效提高能源的使用效率,与此同时,通过合理调度热电联产还可稳定电网、减少电网波动,有利于各类可再生能源的接入。因此,近年来,热电联供在国内外都有了大力发展。由于热电联合网络日益庞大,对于热电联合网络的监控刻不容缓。参考电力系统常用的监控手段,即电力系统状态估计,对热网引入状态估计进行监控。总结了现有的3种热网模型,最终提出了半联合静态模型作为热网状态估计的模型,成功在热网中引入了状态估计。在此基础上,考虑了热网和电网之间的耦合关系,完成了热电联合网络的状态估计,并通过蒙特卡洛实验比较了热电联合状态估计与单独状态估计的性能。热电联合状态估计通常可以得到更精确的全局一致基态潮流解,这为后续的热电联合网络在线安全评估、优化调度打下了基础。

Combined electricity and heat generation can improve energy efficiency and reduce electric networkfluctuation. It is necessary to monitor combined electricity and heat networks as its scale becomes larger. Asan ordinary way to monitor electricitynetwork,state estimation can also be introduced in district heating network. This paper summarized three kinds of models for district heating network and chose simplified static model for district heating network state estimation. Considering coupling components in combined networks, state estimation for combined system was realized. Comparison between combined and separate state estimations was presented. Generally, combined state estimation is more accurate and gives global solution as basis of security evaluation, scheduling and dispatch of combined electricity and heat networks.