Combination model construction and analysis method of thermal power units in response to intermittent wind power

Abstract

The present invention discloses a power unit combination model construction and analysis method dealing with intermittency of wind power. The wind power in a period is taken as a continuous random fluctuation process, the dual indeterminacy of the position of a wind power space and the fluctuation rate in a confidence interval is considered at the same time, and the dual attributes of wind power intermittency features are described; the minimum sum of the power unit start-stop cost and the operation cost is taken as a target to ensure that the operation stability is a constraint condition so as to construct a mathematic model of power unit combination; and the fluctuation rate which can be dealt with out of the confidence interval in each period is subjected to correction, and the corrected fluctuation rate substitutes into the constraint condition for optimization solution. Based on the invention, the power unit combination model construction and analysis method dealing with intermittency of the wind power can deeply discuss the relation between the wind power combination and the wind power receiving of the wind power combination to analyze the capacity of the wind power combination receiving the wind power in various and harsh situations and the corresponding laws of economics.

Description

technical field [0001] The invention relates to a method for constructing and analyzing a combination model of a thermal power unit for dealing with intermittent wind power. Background technique [0002] Today, how to accept wind power in the power grid has become a challenging issue. Because of the inherent variability and uncertainty of wind power, referred to as intermittency, there are imbalances in the range and rate in the process of power balance. If it is not handled properly, it will not only affect Its acceptance also threatens the safe operation of the power grid. In the operation of a power system dominated by thermal power, unit combination is one of the key issues. The unit combination is generally based on a daily or weekly cycle to determine the start and stop plan of the unit. Corresponding to the research cycle, it is often divided into several periods, such as each period lasts for one hour. The result of such unit combination decision-making is actually...

AI Technical Summary

Problems solved by technology

It can be found that these studies focus on dealing with the uncertainty of wind power, such as the limited scenario approximation or interval expression of probability. The biggest difference from the traditional research methods lies in the organic involvement of backup and power generation planning, but cannot reflect the intermittent imbalance. scenarios, it is difficult to measure and solve the above problems

[0004] In order to more effectively reduce and alleviate the impact of wind power intermittent characteristics on the unit combination, so as to improve the feasibility of unit combination decision-making in actual implementation, the existing literature tries to use the idea of ​​shortening the duration of each period (such as 5 minutes) to Solving the above phenomenon will undoubtedly increase the calculation cost of the unit combination, and at the same time, it still cannot solve the problem of whether the instantaneous pinning is feasible; another literature begins to add the climbing event constraint in each time period to consider the instantaneous intermittent problem, but because the constraint is still Dealing with the time-varying process of wind power according to the idea of ​​uniformity, and ignoring the possibility of intermittent wind power at positions other than the expected value, it is still impossible to judge the feasibility of the problem; in this regard, there are also literatures that start from a similar kinematics perspective and analyze The most severe scenario range of the intermittent change process of wind power in a period of time is given, and a simple and effective unit power allocation strategy to deal with this harsh scenario is given, which can effectively solve feasible problems such as instant and instant containment

This gives at least a measurable measure of dispatch enforceability, but these studies are limited to single-period economic dispatch

Images