Combination method of grid-connected units with wind power considering multi-time scale flexibility constraints

Abstract

The invention discloses a method for combining wind power grid-connected units considering multi-time-scale flexibility constraints. The steps include: 1. Establishing a power system multi-time-scale flexibility supply model based on the mixed integer linear (MIL) method; 2. Based on the wind power Predict the time-varying probability characteristics of the error, and establish a multi-time scale flexibility demand model of the power system; 3 establish a wind power grid-connected unit combination model considering multi-time scale flexibility constraints. The present invention analyzes the supply and demand of multi-time-scale operation flexibility, considers multi-time-scale flexibility constraints, and establishes a unit combination model of a power system including wind power, which can fully reflect the supply-demand balance relationship of multi-time-scale flexibility of a power system including large-scale wind power, On the premise of ensuring system flexibility and safety, the operating economy is improved.

Description

technical field [0001] The invention relates to the field of power system dispatching operation, in particular to a method for combining wind power grid-connected units considering multi-time scale flexibility constraints. Background technique [0002] With economic development, energy consumption continues to grow, and wind energy, as a clean and renewable energy source, has rapidly increased its share in global energy supply. Wind power has the characteristics of environmental protection and low operating cost. The vigorous development of wind power has a very good effect on alleviating the tense energy situation in our country. However, the intermittent, fluctuating, and difficult-to-predict characteristics of wind power have brought great difficulties to the safety and economic dispatch of power systems. In order to maintain the real-time balance of system power and ensure the safe and stable operation of the system, the unit combination of large-scale wind power system...

AI Technical Summary

Problems solved by technology

At present, the research on power system flexibility is still in its infancy. 1) Existing achievements mostly refer to power system reliability assessment, focusing on the research on flexibility technology at the planning level, and constraining the unit combination on the flexibility at the operation level and considering the operation flexibility There are few studies, and it is impossible to guarantee the operation economy and safety of large-scale wind power systems; 2) Existing research only focuses on a single time scale, and the flexibility resources only consider the spinning reserve capacity, and cannot consider the contribution of unit start-up and shutdown to operational flexibility. Increased operating costs of power systems including large-scale wind power

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