Abstract:

The traditional assessments of regional distribution network planning only focus on economy resulting in that the assessments are not comprehensive. To solve the problem， the paper constructed a comprehensive evaluation index system from four aspects of power supply margin， network security， service level and economic benefits， with considering the factors of the technical and economic level and the power responsibility of enterprise in the overall planning scheme of medium-lower voltage distribution network. And the comprehensive evaluation model was built based on the PSV （public service value） model， which could realize the scientific evaluation for the overall planning scheme of medium-lower voltage distribution network. The index system construction and evaluation process follows the principle of differentiation， which designs the evaluation index and set up the index weight and evaluation criterion in differentiation， based on the power supply zone in ‘the guide of planning and design of distribution network’ （Q/GDW 1738-2012）. Meanwhile， the index scoring adopts the comprehensive scoring method of stock value and increment value. So the investment sensitivity difference in different regions caused by the differences in the current situation of network， the power supply demand and the development goals can be solved. Actual examples show that the proposed method can effectively promote the optimal allocation of resource science in medium-lower voltage distribution network planning， and guide the planning direction.

Key words: overall planning, comprehensive evaluation index system, PSV model, differential design