含有分布式电源的广义负荷建模  

Generalized Load Modeling Considering Wind Generators Connected to Distribution Network

作　　者：张剑[1] 孙元章[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2011年第8期41-46,共6页Power System Technology

基　　金："十一五"国家科技支撑计划重大项目(2008BA13B04)~~

摘　　要：随着智能电网技术的发展,配网侧将接入大量风机,传统负荷模型不能很好地描述负荷特性。以含有风电的广义负荷建模为目的,提出了含有风电的广义负荷模型结构,只需在综合负荷模型(synthetic load model,SLM)的虚拟母线上增加1台异步发电机。提出了参数辨识策略:先通过统计综合法得到聚合模型参数,然后采用总体测辨法,将低灵敏度参数、非时变参数固定为聚合值,对于高灵敏度且时变参数采用遗传算法在聚合值附近进行参数辨识。只辨识电动机的定子电抗、电动机比例、电动机初始负载率、风力发电相对纯负荷的比例、配电网络电阻、配电网络电抗共6个参数。通过对风机3种接入位置进行仿真表明,上述模型结构的描述能力、泛化能力和辨识结果的稳定性较好。Along with the development of smart grid, a large amount of wind generators will be connected to distribution network, for this reason traditional load model can no longer describe load characteristics well. To build generalized load model under such condition, a load model structure containing wind generators is proposed, namely that is needed to add an induction generator to the fictitious bus of SLM model. A parameter identification strategy is put forward： firstly the parameters of aggregation model are obtained by component-based method, then by use of measurement-based method the pararfieters with low sensitivity and non-time-varying parameters are fixed to that of aggregation model; the identification of time-varying parameters with high sensitivity is carried out around that of aggregation model by generic algorithm. Only six parameters, i.e., the leakage inductance of stator, the proportion of induction motors, the initial load factor of induction motors, the proportion of wind power output to pure load, the resistance of distribution network and the reactance of distribution network, need to be identified. The simulation results of three positions where the wind generator is connected to distribution network show that the proposed model structure possesses better characterization ability, generalization ability and stability of identified parameters.

关 键 词：广义负荷建模 风机 参数辨识 模型结构 统计综合法 总体测辨法 

分 类 号：TM714[电气工程—电力系统及自动化]