Research On Comprehensive Benefits Evaluation And System Planning Of Smart Grid

Smart grid, which can intelligently integrate the actions of all the entities connected to it, such as generation companies, distribution companies and consumers of energy, aiming at delivering electrical power in a sustainable, economic and secure way, has already aroused enormous interest and attention all over the world. Smart grid development has a great impact not only on electric power industry itself, but also on energy, economy, environment and other aspects which are bounded up with our life. As a result, it is not enough to study the smart grid technical problems merely. Researches on policy, development strategy, market mechanism, system planning and other soft science problems associated with smart grid are necessary as well. Given this background, key issures of smart grid development concentrated on development assesement, benefits evaluation, and system planning are studied in this thesis, and some conclusions of the researches are accomplished as follows:1) A comprehensive assessment index system of smart grid which is divided into development level index set and impact index set is proposed. The former represents the level and scale of new types of technology brought up by smart grid from power generation sector, power grid sector to power consumer sector, while the latter reflects the benefit and impact of smart grid on country and society and power generation, grid and consumer companies. At last, the assessment procedure of smart grid based on fuzzy analytical hierarchy process is established.2) The well-established Pressure-State-Response (PSR) framework in resource economics is employed to analyze the inherent mechanism of the social welfare associated with smart grid development, and a novel evaluation model developed. First, the emerging types of technology in the power generation sector, power grid sector as well as terminal consumer sector brought up by smart grid development are taken as the incentives, and the enhanced capability of accommodating renewable energy generation, improved efficiency of power system operation, optimized allocations of energy resources and so on as the evolving states. Then, the relationship between technological development and system states is investigated, and on this basis an evaluation system for measuring the social welfare associated with smart grid development presented. Finally, the social welfare of smart grid development in a province in northwest China is carried out by employing the developed evaluation model, and reasonable evaluation results attained. 3) Stackelberg game model is employed to analyze the procedure of transmission system planning under the smart grid development environment, and a bi-level transmission system planning programming model is proposed with the decision of wind power company taken into account. At first, the power grid company and wind power company are regarded as leader and follower in the game model respectively. Then a bi-level programming model is developed to balance the requirements of economics and wind power company’s decision. At last, a modified IEEE18-bus system is served for demonstrating the essential features of the developed model and employed algorithm.Finally, several conclusions are obtained based on the research outcomes, and directions for future research indicated.