Wind farm voltage automatic control method based on model predictive control theory

Abstract

The invention relates to a wind farm voltage control method based on a model prediction control theory, and belongs to the technical field of wind farm voltage automatic control of a power system. The method includes collecting the current measured values ​​of various types of electricity in the system as the initial values ​​of the predicted values ​​of various types of electricity, establishing an optimal control model composed of an optimization objective function and constraints according to the predicted values; simplifying the optimal control model, and using the optimization The tool solves the simplified model of optimization control, and obtains the solution sequence of the fan reactive power setting value and the SVG voltage setting value within the MPC time window; the first value in the solution sequence is sent to the fan and SVG respectively as the control target to realize wind power generation. Automatic control of field voltage. The method can be integrated into an automatic voltage control system operating on-site in a wind farm, so that the system can implement the most suitable control strategy according to the power change of the wind farm in real time.

Description

technical field [0001] The invention belongs to the technical field of automatic voltage control of wind farms in power systems. Background technique [0002] In recent years, the wind power grid-connected capacity has continued to grow rapidly, and voltage problems in large-scale wind power collection and grid-connected areas have been accompanied by it. The distribution of my country's wind energy resources is far away from the load center, and most of the wind power is connected to the weak power grid that lacks the support of conventional hydro-thermal power plants. The regional voltage is easily affected by the active and reactive power of the wind field. When the gust passes by, the wind power may fluctuate sharply within minutes, which will cause the voltage of the PCC (Point of Common Coupling) of the wind farm to fluctuate violently. [0003] Most of the wind farms currently put into operation on site refer to the design of voltage controllers in traditional therma...

AI Technical Summary

Problems solved by technology

When the wind fluctuates rapidly and the reactive power adjustment of the wind turbine is limited, the SVC / SVG will track the voltage target, and it is easy to exhaust its own dynamic reactive power reserve first, resulting in the failure to provide support in future emergencies or violent voltage fluctuations

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