Large-scale wind power-containing power transmission network planning system considering risks

Abstract

The invention relates to a large-scale wind power-containing power transmission network planning system considering risks. The large-scale wind power-containing power transmission network planning system comprises a database module, an input module, an analysis module, a planning module and an output module, wherein the database module is used for storing wind speed data, load data and power equipment data; the input module is used for acquiring required data from the database module and the outside of the system; the analysis module is used for calculating an economic risk index, a technical risk index and investment cost of a planning scheme according to the input data and acquiring security constraint conditions of a power transmission network; the planning module is used for building a power transmission network planning model, determining the power transmission network planning model according to the economic risk index, the technical risk index, the investment cost and the security constraint conditions of the power transmission network, obtained by the analysis module, and acquiring the power transmission network planning result considering the economic risk and the technical risk; and the output module is used for outputting the power transmission network planning result. Compared with the prior art, the risks caused by wind farm output uncertainty can be lowered when the investment cost is controlled; and the large-scale wind power-containing power transmission network planning system has the advantages of high efficiency, comprehensive factor consideration and the like.

Description

technical field [0001] The invention relates to the technical field of wind power output system planning, in particular to a large-scale wind power transmission network planning system that considers risks. Background technique [0002] With the shortage of fossil energy and the worsening of environmental problems, wind energy, as a clean and renewable energy source, has received more and more attention. The installed capacity of wind power accounts for an increasing proportion of the total installed capacity of the power system. For example, my country is building 9 million kilowatts level wind power base. Due to the intermittency and volatility of wind energy, the centralized connection of large-scale wind power will inevitably bring certain risks to the power system, such as the risk of line overload and the risk of investment income. One of the goals of power grid planning is to meet the requirements of future power supply development. Therefore, in order to make wind po...

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Problems solved by technology

[0003] After searching the existing literature, it is found that among the existing literature, Zhang Jianping, Zhu Zhonglie, Liu Lu, etc. published in "Automation of Electric Power Systems" (2014,38(19):47-51) "Scale Wind Power Integration Transmission System Value Planning Method" established the value planning model of large-scale wind power transmission system based on the whole life cycle cost model, and comprehensively analyzed the comprehensive benefits of large-scale wind power transmission system in the planning process; Liu Lu in her doctoral thesis " Research on Transmission Network Planning Method Considering Life-Cycle Cost" Taking the minimum life-cycle cost and the minimum conditional risk value of investment income as the objective function, the genetic algorithm is used to solve the planning model, and the branch number of the new line in the transmission network is planned and new quantity, but only the uncertainty of load is considered in the planning model, and the uncertainty of wind power output is not considered

"Pareto Optimal Multi-objective Grid Planning Considering Transmission Congestion" published by Wang Yi and Cheng Haozhong in "Proceedings of the Chinese Society for Electrical Engineering" (2008,28(13):132-138) Minimal investment cost and grid annual congestion The minimum surplus is the objective function, and the strength Pareto evolution algorithm is used to solve the power grid planning model, and the branch number and the number of new lines are planned under the condition of simultaneously controlling the investment cost and transmission congestion, but the planning model is not deterministic The planning model does not take into account uncertain factors such as wind power output

Chinese patent CN102545258 discloses a large-scale wind power grid-connected grid optimization planning method, which obtains grid planning data, system operation prediction data, and wind power planning data, and constructs a calculation model by using optimization algorithms such as Benders decomposition method and branch-and-bound method. The computer solves the problem, considering the investment of new lines and the comprehensive benefits of wind power to plan the grid connection of wind power, but the patent does not consider the risk of wind power connected to the power system

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