A method and system for controlling the rate of change of active power in a wind farm

Abstract

The invention relates to a method and system for controlling an active power change rate of a wind farm. The control method comprises the following steps of reading the installed capacity of the wind farm, and calculating a power change rate limit value of the wind farm within 1min and a power change rate limit value of the wind farm within 10min; predicting a wind speed of the wind farm; calculating a statistical wind speed-power curve of the wind farm; calculating predictive power of the wind farm according to the predicted wind speed and the statistical wind speed-power curve of the wind farm; and calculating the power change rate, and controlling the active power change rate of the wind farm. The invention further relates to the system. The system comprises an initialization module, a wind speed prediction module, a wind speed-power curve generation module, a power prediction module and a power control instruction calculation module. Through the method and the system, the power change rate of the wind farm can be limited below a change rate limit value specified by the national standard, so that the impact on a power grid is reduced, and the requirements on a fast variable frequency power source are reduced; and meanwhile, the control frequency can be obviously reduced in comparison with a conventional algorithm, and the generating capacity loss of the wind farm is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and system for controlling the change rate of active power of a wind farm. Background technique [0002] In recent years, my country's wind power has developed rapidly. Due to the large-scale wind power connected to the power grid, the volatility and randomness of wind power have brought unprecedented challenges to the stable operation of the power grid. It brings a huge impact, and puts forward higher requirements for the frequency regulation capability of the power grid, especially the rapid frequency regulation capability. "GB / T19963-2011 Technical Regulations for Connecting Wind Farms to Electric Power Systems" puts forward specific requirements for the 1min active power change and 10min active power change limits of wind farm active power under normal operating conditions, so it is necessary to study on the basis of national standards The control method of the ac...

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Problems solved by technology

[0003] Conventional wind power control methods are based on the current working conditions of the wind farm and do not use the power prediction results. Therefore, in order to realize the control of the change rate of active power in the wind farm, it is generally based on the current power to add an active power change limit that satisfies the 1min and Satisfy the fixed limit of the 10min active power change limit for control, which will inevitably cause the control command issued by the wind farm to be controlled in each control cycle, causing unnecessary loss of power generation to the wind farm

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