Wind-power-containing grid-connected unit combination method considering multi-time-scale flexibility constraints

Abstract

The invention discloses a wind-power-containing grid-connected unit combination method considering multi-time-scale flexibility constraints. The method comprises the steps 1, establishing a power system multi-time-scale flexibility supply model based on a mixed integer linear (MIL) method; 2, establishing a power system multi-time scale flexibility demand model based on the wind power prediction error time-varying probability characteristics; and 3, establishing a wind power-containing grid-connected unit combination model considering multi-time scale flexibility constraints. According to theinvention, multi-time-scale operation flexibility supply and demand are analyzed; the multi-time-scale flexibility constraint is considered, the wind-power-containing electric power system unit combination model is established, the multi-time-scale flexibility supply and demand balance relation of the large-scale wind-power-containing electric power system can be fully reflected, and the operationeconomy is improved on the premise that the flexibility and safety of the system are guaranteed.

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. Vigorously developing wind power has a very good effect on alleviating the tense energy situation in my country. However, the intermittent, fluctuating and difficult-to-predict characteristics of wind power have brought great difficulties to the safe and economic dispatch of the power system. 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 needs ...

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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