Evaluation And Decision-making Of Power Network Planning Based On LCC Theory

Rational planning of the power grid is the key to achieving the sustainable development and precise operation of the electric power enterprise. Scientific network planning can adapt to the growth of the local economy and load. According to the requirement of the safety and stability, traditional evaluation methods test alternative schemes by means of through power flow calculation, stability calculation and short-circuit current calculation. With the adaptability and coordination taken into consideration, the scheme with the minimum investment cost would be selected as the optimal one. However, traditional methods have the following problems: 1) separation of economic and reliability; 2) lack of objective evaluation method; 3) too large proportion for investment cost with operation and maintenance cost not taken into account; 4) not considering the case of multiple components failure; 5) unable to describe uncertain information in the power network planning.Aimed at above issues, this paper applies the life cycle cost theory into the power network planning and establishes a complete LCC model for power network planning. Meanwhile, in view of the large amount of uncertain information, a blind number model is proposed in order to describe the uncertain factors that influence the power network planning.The complete model does not have the maneuverability at the present stage and lacks of the support of the data soil. Then, a simplified LCC model based on the CSG standard design and typical cost platform is built, which thinks about the coordination of reliability and economic index and the replacement of the equipment. Finally, the paper introduces the design and architecture of the CSG LCC accounting software and analyzes the case of the 100 kV substation planning.The calculation of the reliability indexes were involved in the fault cost of the LCC model. This paper introduces a reliability evaluation method for bulk power system based on the non-sequential Monte-Carlo simulation. In the section, a brief illustration for equipment outage model, hierarchical model of load duration curve, system state selection method, fault analysis method based on AC power flow and optimal power flow model is made.Finally, the last section establishes the process of the evaluation method for power network planning based on LCC and the comprehensive evaluation index system. Using grey correlation analysis as the value evaluation method and subjective and objective combination weighting method in the framework of game theory, the paper selected the optimal scheme from the three schemes for IEEE Garver6. The simulation shows that the evaluation method proposed in the article has certain fault tolerance and the superiority in the small sample grey system.