考虑能量特性差异的用户级综合能源系统混合时间尺度经济调度

Economic Dispatch With Hybrid Time-scale of User-level Integrated Energy System Considering Differences in Energy Characteristics

针对用户级综合能源系统(integrated energy system,IES)规模小,能量耦合复杂的特点,建立一种考虑能量特性差异的混合时间尺度经济调度模型。首先,在日前尺度中,对电、冷、热能以相同的时间分辨率进行协调优化,同时为了应对各类预测误差,基于机会约束规划模型设置一定置信度的电、气备用;其次,针对冷热能的慢动态特性,采用电-冷/热解耦的日内混合时间尺度修正方法,根据日前出力,在上层以低时间分辨率优化冷、热能相关设备出力,在下层以高时间分辨率,结合上层时间分辨率的修正结果来调整储电装置和联络线调度计划;最后,提出了几种备用场景和混合时间尺度分辨率的动态选择方法,并分别对日前备用计划和冷热能潜在影响下的时间尺度灵活性作以定量分析,说明混合时间尺度和日前备用对用户级IES调度的意义。

Given the characteristics of small scale and complex energy coupling of the user-level integrated energy systems(IES),an economic dispatch model with hybrid time scale is established considering the differences in energy characteristics.Firstly,coordinated optimization of electrical,cooling and heating energies with the same time resolution is dispatched in day-ahead scheduling.Some electricity and gas reserves are used to cope with all kinds of forecasting errors at a given confidence level based on the chance constrained programming model.Then,the intra-day hybrid time-scale correction method of energy decoupling is used given the slow dynamic characteristics of the cooling and heating load.Taking the day-ahead scheduling as reference to optimize the output of heating and cooling elements with low time resolutions at the upper level of the model and adjust battery and tie line scheduling plan with high time resolutions at the lower level based on the results at the upper level.Finally,dynamic selection methods of time resolution under hybrid time scale are proposed and several reserve scenarios are also put forth.Meanwhile,the day-ahead reserve plan is conducted and the time-scale flexibility under the effects of heating and cooling energy are quantitatively analyzed.The significance of hybrid time scale and day-ahead reserve plan for user-level IES dispatching is explained.