Abstract
Power grid enterprises are faced with a serious mismatch between limited investment capacity and numerous investment projects. How to accurately match the weak links with investment projects according to the power system diagnosis is the key to improve investment accuracy. On the basis of an investment-oriented label, a project portfolio optimization framework with coherent diagnosis–evaluation–optimization is proposed in this study. First, a two-layer index system for investment benefit evaluation is established, which considers unit investment efficiency and macroinvestment benefit. Second, by weighing the diagnosis results of power grid and the biased investment environment, the benefit evaluation of the project is implemented as the basis of project portfolio optimization. To meet different investment demands, two combination optimization models of maximizing investment benefit and minimizing investment cost are established considering the coupling benefit relationship and time series relationship between projects. Finally, a case study is conducted for a regional distribution network. The proposed framework has been proven to be able to effectively cope with different investment needs and realize the dynamic adjustment of the scheme in the whole investment cycle.
Highlights
As a significant part to ensure safe and stable operation of power grids and improve power supply quality, the distribution network planning has become the focus of medium- and long-term investment of power enterprises
A two-layer index system for investment benefit evaluation of distribution network projects is first constructed to diagnose the development of power grids, which quantifies the efficiency of project funds based on the specific label
Time Series Correlation Characteristics In addition to the coupling benefit characteristics, time series correlation characteristics exist among distribution network planning projects according to the construction requirements and Objective Function According to the difference in objective function, the investment decision problem in this study is divided into two categories: one is to improve the performance within a certain amount of investment, and the other is to minimize the total investment cost under certain security constraints
Summary
As a significant part to ensure safe and stable operation of power grids and improve power supply quality, the distribution network planning has become the focus of medium- and long-term investment of power enterprises. A two-layer index system for investment benefit evaluation of distribution network projects is first constructed to diagnose the development of power grids, which quantifies the efficiency of project funds based on the specific label. On the basis of constraints such as traditional total investment, power grid development demand, and portfolio return, combined with the project coupling benefit and timing correlation constraints in actual production, a distribution network portfolio optimization model aiming at maximizing comprehensive benefits and minimizing investment cost is established, respectively. The investment benefit score of a single project can be calculated using the following formula: Si. where Si is the comprehensive score of the ith investment project; si,j are the scores of the jth index; wm represents the weight of the kth objective criterion; and n represents the total number of indicators. Time Series Correlation Characteristics In addition to the coupling benefit characteristics, time series correlation characteristics exist among distribution network planning projects according to the construction requirements and
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