# Highway Microgrid Project Evaluation under Energy Transportation Integration
###### Abstract
The results express that the improved principal component analysis method can keep more of the original data's scattered information. [PERSON] et al. [19] built a multi-stage evaluation index system and proposed an evaluation model combining equilibrium analysis and principal component analysis to achieve the objective evaluation of correlation index information. Based on the fuzzy membership degree hypothesis, [PERSON] et al. [20] quantifies the risk situation of each stage in the life cycle of the urban power grid, and gives the comprehensive quantitative scores of various risks. However, in the above study, the subjective weighting method shows the subjective opinion and intuition of a specialist, which is arbitrary. The objective weighting method ignores the subjective information necessary for safety evaluation, because it only relies on specific data; the calculation results will be inconsistent with the actual phenomenon. There is a lack of weight evaluation of highway microgrids. In order to settle the above difficulty, this paper innovatively establishes an index evaluation model for the energy system of a highway microgrid project under the integration of energy and transportation, which provides a new idea for the construction of an integrated highway energy system. In this paper, the AHP-entropy method is employed to compute the comprehensive weight, and then the grey evaluation method is used to realize the scientific evaluation of a microgrid planning scheme. Compared to the above-mentioned literature, this paper has two main contributions. 1. The first contribution is a new direction for the comprehensive benefit evaluation of a highway energy system, considering the integration of energy and transportation, and the effective evaluation of the complementary highway microgrid, considering the energy coupling characteristics of \"Source-Network-Load-Storage\". This paper mainly synthesizes three benefit indicators: economic benefit, technical benefit, and environmental benefit. The economic benefit covers the net present value and the internal rate of return. The technical benefit includes energy use efficiency and power supply reliability. The environmental benefit contains carbon emission reduction and emission reduction benefit. 2. The second contribution is that the AHP-entropy weight method is put forward to ensure the weight between different standards. The AHP-entropy weight method is used to work out the weights, not only considering the experience of the evaluator, but also providing objectivity. Meanwhile, a grey comprehensive evaluation using grey relational degree is presented to achieve the comprehensive evaluation of the efficiency of the highway microgrid project. By utilizing the proposed method in an empirical analysis, this method is effective in the comprehensive benefit evaluation of highway microgrid projects, and the highest score is 0.9127. Through comparative analysis of disparate planning schemes and methods, the evaluation of \"Source-Network-Load-Storage\" complementary fusion highway microgrid project using subjective and objective evaluation methods can achieve reliable energy supply, energy synthetical utilization, and maximum environmental benefits within the expected investment range. The rest of this paper is as follows. the comprehensive evaluation system for expressway microgrid projects is set up in Section 2. The theoretical framework for the grey comprehensive evaluation model based on the AHP-entropy weight method is described in Section 3. The consequences for experimental study are analyzed in Section 4. Finally, the chief conclusions and future research directions are shown in Section 5.