带理想变压器的综合负荷模型

Synthesis load model with ideal transformer

直接考虑配电网模型的综合负荷模型(SLM)是正在推广的一种负荷模型,该模型能够较为准确地反映配电网络以及配电网无功补偿的状况。但该模型中并没有考虑配电网中变压器的作用,有可能导致低压母线的电压在部分情况下过低,而使系统不能正常计算。提出在配电网络部分加入一台等值理想变压器,配合无功补偿装置以稳定供电电压,由此建立带理想变压器的综合负荷模型(SLM-T)。在此基础上提出了该模型的参数辨识方法,并给出具体辨识步骤。通过仿真算例,分析不同配电网电抗值情况下SLM、非固定变比SLM-T、固定变比SLM-T 3种模型的效果,推荐使用非固定变比SLM-T。

The SLM（Synthesis Load Model） is being promoted,which represents the distribution network and the reactive power compensation more accurately.However,it does not consider the role of transformer in distribution network,which may lead to much lower low-voltage bus voltage in some cases,resulting in improper system calculation.A SLM-T（Synthesis Load Model with Transformer） is proposed by adding an ideal transformer to the SLM,which cooperates with the reactive compensator to stabilize low-voltage bus voltage.Its parameter identification method is developed and the corresponding steps are presented.The effects of SLM,SLM-T with inconstant transformation ratio and SLM-T with fixed transformation ratio are analyzed by case simulation for different distribution network reactances.SLM-T with inconstant transformation ratio is recommended.