含冷热电三联供的微能源网能量流计算及综合仿真

Energy Flow Calculation and Integrated Simulation of Micro-energy Grid with Combined Cooling,Heating and Power

首先给出了微能源网的定义,然后基于能源集线器的概念,建立了冷热电三联供(CCHP)系统的能量流模型;并将其作为配电网与天然气网的耦合节点,推导了适用于天然气网能量流计算的有限元节点法,提出了一种电—气耦合微能源网的能量流计算方法。提出了CCHP供能率的指标。以openDSS和MATLAB为平台,对含CCHP的微能源网进行综合仿真,分别计算了以电定热和以热定电两种典型运行方式下夏季典型日的逐时能量流。计算结果表明,所提出的能量流计算和综合仿真方法可用于分析微能源网的能量流,CCHP供能率指标可以反映微能源网电—气能源的耦合程度。

Firstly,the concept of micro-energy grid is introduced,and the energy flow model of combined cooling,heating and power（CCHP）system is proposed based on the concept of energy hub.The CCHP will act the role of the coupled nodes between distributed network and natural gas network.Then the finite element node method for the calculation of natural gas network energy flow is deducted.Besides,based on the software of openDSS and MATLAB,a novel method and integrated simulation platform of electricity and gas coupled energy internet is proposed.In order to assess the coupled degree of the distributed network and natural gas network,a novel index named CCHP energy supply rate is introduced.Case studies are taken with two typical operation models on a typical summer day：following the thermal load and following the electric load.Simulation results show that the method and integrated simulation platform are available and the CCHP energy supply rate index can be used to assess the coupled degree of electric-gas energy for micro-energy grid.