基于三相不平衡网络能量流的高比例新型源荷配电台区碳排放流计算

Carbon emission flow calculation for high proportion new source-load distribution station area based on three-phase unbalanced network energy flow

在碳中和、碳达峰的目标推动下,精确、实时的碳足迹追踪可为碳减排和碳交易提供量化依据。随着分布式电源、电动汽车和储能等新型源荷不断接入配电台区,传统的碳排放流(也称碳流)计算方法无法满足配电台区三相不平衡网络的碳足迹追踪需求。针对该问题,提出一种基于三相不平衡网络能量流的含高比例新型源荷配电台区碳流计算方法。首先,建立了计及时空关联性的储能和电动汽车双向元件的精确碳排放模型;然后,考虑新型源荷单相接入、三相四线制网络结构以及中性线损耗等,提出了基于矩阵形式的配电台区碳流计算方法;最后,采用21节点的低压配电网三相四线制线路进行算例仿真,分析了储能和三相不平衡度对碳流分布的影响,验证了所提方法的有效性。

Driven by the goal of carbon neutrality and carbon peak,accurate and real-time carbon footprint tracking provides a quantitative basis for carbon reduction and carbon trading.As new source-load,such as distributed power sources,electric vehicles and energy storage are increasingly connected to the distribution area,the traditional carbon emission flow calculation method cannot meet the demand for carbon footprint tracking in the distribution station area with high proportion of new sources and charges.To solve this problem,this paper presents a method for calculating carbon emission flow in distribution station areas with high proportion of new source-load access based on the energy flow of three-phase unbalanced network.Firstly,carbon emission models are established based on different types of new source charges in distribution station area.Then,considering the single-phase access of new source-load,the three-phase four-wire network structure and the loss of neutral line,a matrix-based calculation method for carbon emission flow in distribution station area is proposed.Finally,a 21-bus three-phase four-wire system of low voltage distribution network is used to simulate the effects of energy storage and three-phase unbalance on carbon emission flow distribution,and the effectiveness of the proposed method is verified.