面向综合负荷的燃料电池等效模型及参数灵敏度分析

A Fuel Cell Equivalent Model for the Synthetic Load and Its Parameters Sensitivity Analysis

基于Matlab/Simulink建立了固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)及其并网系统的动态模型,研究了SOFC发电系统的外特性。从外特性等效拟合的角度出发,忽略SOFC并网系统的无功功率,提出了SOFC发电系统的等效模型。该模型结构简单,参数少,易于辨识,能够有效拟合电网在大扰动和连续小扰动情况下的燃料电池发电系统外特性,与其他模型相比能够模拟燃料电池的出力极限问题;分析了该模型的参数的灵敏度,模型的两个参数的灵敏度虽不高但易于辨识;用本文提出的SOFC等效模型并联传统的综合负荷模型(Synthesis Load Model,SLM)构建广义负荷模型,对含SOFC发电系统的配电网负荷特性进行辨识建模。算例表明,该广义负荷模型能够有效描述含燃料电池发电系统配电网负荷特性,且模型的参数辨识结果具有较好的稳定性。

The SOFC（solid oxide fuel cell） and its grid-connected system is established base on Matlab/Simulink,and the external characteristics of SOFC power systems is researched;then a equivalent model of SOFC power generation system is proposed from the perspective of external characteristic equivalent fitting and ignoring the reactive power of the SOFC generation system.This equivalent model has a simple structure,less parameters,can be identified easily.It can fit the external characteristics of SOFC power systems effectively in the case of large disturbance and continuous small disturbance of power system,compared with other equivalent models,this model can simulate the limit of the fuel cell＇s output;the synthesis load model multiplied with equivalent model is used to fitting the characteristics of power synthesis load containing the SOFC power systems,examples show that this generalized load model can describe the load characteristic of distribution network with fuel cell power generation system,and identification result of it＇s parameters are stability.