一种基于注入功率灵敏度的局部降损方法  

A Local Loss Reduction Method Based on Injected Power Sensitivity

作　　者：文晶 刘文颖 谢昶 王维洲[2] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网甘肃省电力公司电力科学研究院,兰州730050

出　　处：《华东电力》2014年第2期247-253,共7页East China Electric Power

基　　金：国家电网公司科技项目(2011103004)~~

摘　　要：由于网架结构、电源和负荷分布的不均衡,使电网运行中多发生局部线路损耗过高的状况,严重影响电网的经济运行,而采用全局优化的方法往往达不到理想的效果。提出一种基于注入功率灵敏度的局部降损方法,能够在全网网损率不升高的前提下快速有效地降低电网局部线路损耗。该方法首先建立了降损率模型,将降低线损率的问题转化为调整节点注入功率的问题,然后通过计算节点注入功率的灵敏度确定参与降损调整的发电机节点和无功补偿节点,并根据反向等量配对原则计算其注入功率的调整量,最后根据电网安全约束的要求,采用对数障碍罚函数对引起系统越限的调整量进行修正。通过对IEEE 118节点系统的算例分析,验证了该方法的有效性和快速性。Due to the unbalanced distribution of grid structure, power supply and load, the local line loss is often ex- cessively high in grid operation, which seriously affected the economic gird operation. However, the global optimiza- tion methods often can not achieve ideal results. This paper proposes a local loss reduction method based on injected power sensitivity, which can reduce the loss of local lines quickly and effectively on the premise that the whole net- work loss rate does not rise. Firstly, the model of loss reduction rate is established, which can transform the problem of reducing the line loss rate into the problem of adjusting the power injection. Then it determins the generator nodes and the reactive power compensation nodes which need adjusting in the process of the loss reduction by sensitivity cal- culation and calculates the adjustment of injected power according to the principle of equal and opposite adjustment in pairs. Finally, according to the requirements of the grid security constraints, logarithmic barrier penalty function is used to modify the adjustment which causes the system to be off-limited. Through analyzing the example of IEEE 118 node system, the effectiveness and rapidity of this method were verified.

关 键 词：局部降损 灵敏度计算 反向等量配对 对数障碍罚函数 

分 类 号：TM711[电气工程—电力系统及自动化]