Combination method of robust unit for security constraint of power grid

Abstract

The invention provides a combination method of a robust unit for security constraint of a power grid. The method comprises the following steps: S1, predicting a wind power output, performing Latin hypercube sampling on the wind power output to generate scene sets, and then curtailing the scene sets by means of a scene curtailing technology; S2, sequencing the curtailed scene sets according to the corresponding probabilities; S3, solving a primary problem according to the predicated wind power output, that is, the unit combination problem of definitely considering the security constraint; S4, performing security verification on the scenes one by one by means of the combined strategy of the unit; if verification passes, calculating the cost of shedding the load and curtailing wind in other scene sets by a start-stop policy, adding the scenes into a robust confidence interval, and performing security verification on the next scene; if not, generating benders to be returned to the primary problem, and repeating the S3; and S5, after security verification on all the scenes, determining the policy with the smallest total cost as the optimum policy.

Description

technical field [0001] The invention belongs to the technical field of electric power system dispatching, and in particular relates to a method for combining robust generating units with grid security constraints. Background technique [0002] In order to cope with the depletion of fossil energy and environmental degradation, the penetration rate of intermittent renewable energy such as wind power and solar energy in the power system has gradually increased, which has brought problems and even challenges to system security and economic operation. Since it is difficult to accurately predict the power generation output of intermittent renewable energy, this brings difficulties to the pre-establishment of system operation mode and real-time scheduling. Thus, for such an uncertain environment, how to determine the operation and scheduling strategy that takes into account the system economy under the premise of ensuring system security is an important issue worth studying. [00...

AI Technical Summary

Problems solved by technology

[0002] In order to cope with the depletion of fossil energy and environmental degradation, the penetration rate of intermittent renewable energy such as wind power and solar energy in the power system has gradually increased, which has brought problems and even challenges to system security and economic operation.

Since it is difficult to accurately predict the power generation output of intermittent renewable energy, this brings difficulties to the pre-establishment of system operation mode and real-time scheduling

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