A closed-loop active power control method for wind farms

Abstract

The invention provides a control method for the closed-loop active power of a wind power plant. The control method comprises the following steps: reducing the order of a variable-pitch wind generation set model according to the demand of scheduling on the time scale of the wind power plant to obtain a variable-pitch wind generation set simplified model; quantifying the adjustment time of a variable-pitch wind generation set according to the variable-pitch wind generation set simplified model to obtain an equivalent time constant based on a variable-pitch wind generation set reduced-order model; and taking the closed-loop optimal dynamic response of the wind power plant as a target, and computing given power allocated to the variable-pitch wind generation set according to the running state and dynamic wind speed information of the wind power plant comprising various types of wind generation sets. The dynamic response of the variable-pitch wind generation set is considered; a computation process is relatively simple; and the outer characteristics of the wind generation set can be accurately reflected.

Description

technical field [0001] The invention relates to a closed-loop active power control method of a wind farm, in particular to a closed-loop active power control method of a wind farm considering the dynamic response of a variable pitch unit, and belongs to the technical field of wind farm control. Background technique [0002] Wind power generation is intermittent, fluctuating and random, and cannot provide stable power generation. In order to cope with the huge pressure and new challenges brought by large-scale wind power access to grid active power dispatching and security and stability. GB / T19963-2011 "Technical Regulations for Wind Farm Connected to Power System" and "Wind Power Dispatch Operation Management Regulations" issued by State Grid Corporation of China regulate the technical standards for wind power grid-connected operation, and clearly require that wind farms should have active power regulation capabilities , can control its active power output according to the ...

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Problems solved by technology

[0004] However, the dynamic response process of wind turbines is not considered in the analysis process of the above research, and there are still two problems: on the one hand, there are differences in the response characteristics of the wind turbines, and it is difficult to complete the given power at the same time, which will lead to closed-loop In the process, the time of issuing control commands is seriously ahead or lagging behind, and the steady-state accuracy is low; on the other hand, wind farms are usually composed of dozens or even hundreds of wind turbines, and the calculation time is long and takes up a lot of memory during the coordination allocation calculation. , difficult to achieve

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