考虑变工况特性的微能源系统优化规划：(二)优化模型及方法

微能源系统包含多种能源转换和存储设备,各类设备的能源消耗具有显著的变工况特性。为了更准确考虑微能源系统的特征,基于微能源系统在变工况条件下的改进耦合关系模型,首先,以系统经济性为目标,建立微能源系统优化规划模型。然后,考虑系统新能源输入、负荷、外部环境的不确定性,建立多种变工况场景,同时利用分解方法将问题划分为设备容量配置主问题和多阶段设备功率分配子问题以降低求解的复杂性。最后,对微能源系统的优化规划问题进行案例计算,并分别在变工况模型和线性模型下对系统进行配置。结果表明设备变工况特性对系统规划结果有显著影响,需要在微能源系统设计中加以考虑,以实现系统合理配置、提高经济效益。

Optimal Planning of a Micro-energy System Considering Off-design Performance Part Two Optimization Model and Method

A micro-energy system contains a variety of energy conversion and storage equipment. The energy consumption characteristics of energy conversion equipment usually strongly depends on the operation conditions. Based on the improved coupling model of micro energy system under different working conditions which describes characteristics of the system more accurately. Firstly, the optimal planning problem is modeled with an aim of system economy. Then, considering the uncertainties of renewable energy input, load and environmental factors, scenarios under variable off-design conditions are introduced. In order to reduce the complexity of the solution, the optimal problem is divided into master problem of equipment capacity configuration and primal problem of multistage power allocation by decomposition method. Finally, a micro-energy system which involves electricity, natural gas, and heat is configured under the proposed model and the linear model respectively. The result shows that the off-design conditions of the equipment has a significant effect on the system planning result, and it needs to be considered in the planning and design of the microgrid in order to achieve reasonable configuration and improve economic efficiency.