Power grid power transmission margin control method suitable for large-scale wind power access

Abstract

The invention provides a power grid power transmission margin control method suitable for large-scale wind power access. The method includes the steps that (1), security constraint unit commitment optimal computation is carried out by adopting a mixed integer planning method to obtain starting and stopping states and power output plans of a conventional power generation unit meeting an objective function and constraint conditions; (2), the influence on power transmission margin by multi-period wind power randomness is quantized by adopting a probability power flow method to obtain a power flow probability distribution range of a power grid branch or a power transmission fracture surface; (3), whether the power flow probability distribution range meets the requirement of a confidence interval or not is judged, if not, the step (1) is executed again, unit commitment optimal computation is carried out again, and the power output plans are adjusted. Compared with the prior art, the power grid power transmission margin control method suitable for large-scale wind power access fully considers randomness of wind power, improves the using effect of short-period security constraint dispatching plans in a wind power access area and enhances performability of the short-period plans.

Description

technical field [0001] The invention relates to a power transmission margin control method, in particular to a power grid transmission margin control method suitable for large-scale wind power access. Background technique [0002] When wind power is connected to the grid, it is generally limited by the transmission section. When dealing with network constraints, the traditional day-ahead power generation plan is based on a deterministic planned power flow, that is, the next day’s system load forecast and bus load forecast are deterministic, while the next day’s The planned power flow is only determined by the start-stop and output of the generating units, and the day-ahead plan can control the planned power flow within a reasonable range by optimizing the start-stop and output of the generating units. [0003] With the continuous expansion of the scale of wind power access, due to the uncertainty of wind power output, the planned power flow is generally determined by the com...

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Problems solved by technology

[0003] With the continuous expansion of the scale of wind power access, due to the uncertainty of wind power output, the planned power flow is generally determined by the common factors of the start-up and stop of conventional generating units, output and wind power disturbance, so the planned power flow will have a certain degree of uncertainty. Randomness, thus affecting the network security constraint effect of the day-ahead plan, resulting in unexpected power flow crossing or transmission margin of transmission section

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