Wind power plant primary frequency modulation control system

Abstract

A wind power plant primary frequency modulation control system with a hierarchical structure comprises a frequency support controller, a central controller and a plurality of wind turbine controllers. The frequency support controller outputs a signal to the central controller, and the central controller is in communication connection with the plurality of wind turbine controllers; assigning to each wind turbine through a hierarchical non-linear model predictive control; solving a coupling sub-problem and a decoupling sub-problem by using a layered nonlinear model; the central controller solves the coupling sub-problem, and a single controller on each wind turbine solves the decoupling sub-problem; the calculation burden of the central controller is obviously reduced; compared with centralized nonlinear model predictive control, the calculation time can be reduced by 50%.

Description

technical field [0001] The invention relates to the field of frequency modulation control of wind power generation in the field of new energy, in particular to a primary frequency modulation control system of a wind farm. Background technique [0002] As one of the most prominent renewable resources, wind power has developed rapidly in recent years. With the increase of the proportion of wind power in the power system and the increasing number of wind farms replacing traditional power plants, due to the disadvantages of weak support and low immunity of wind turbines, the inertia of the system will inevitably be reduced and the frequency response of the power system will be deteriorated. Since the wind turbine is connected to the grid through a power converter, its rotor speed is decoupled from the system frequency. In addition, it usually works in maximum power point tracking mode without frequency support capability. In addition, the insufficient active power adjustment c...

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Problems solved by technology

[0003] At this stage, load shedding is carried out on the actual operation of wind farms to reserve a certain frequency modulation capacity, so as to provide power support when frequency events occur, but long-term load shedding operation will significantly affect the operating economy of wind farms

[0004] The nonlinear model predictive control that has been put into use in the market can adjust the frequency of wind farms. However, this predictive control method needs to focus on solving the parameter optimization problem involving a large number of input variables, which involves a large amount of calculation.

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