Model predictive control method for smoothing wind power fluctuations with hybrid energy storage

Abstract

The invention relates to a model prediction control method of stabilizing wind power fluctuation with hybrid energy storage, and belongs to the technical field of new energy power generation control. The method comprises the steps of determining a topological structure of a control object, namely a system structure comprising wind power, battery energy storage and supercapacitor energy storage, predicting an output value of the wind power within a control prediction interval by utilizing an average value method, determining an objective function and three constraint conditions of optimization control, solving an optimization problem at each moment, only obtaining optimization control quantity at the current moment, inputting the optimization control quantity into a battery and a supercapacitor for control respectively, summing power output by the battery and the supercapacitor and actual output power of the wind power, and then obtaining grid-connected power of an overall system after power fluctuation stabilization. The control method can achieve the power fluctuation stabilization of the wind power more economically and reliably, is simple in calculation, and facilitates engineering realization.

Description

technical field [0001] The invention relates to a control method suitable for smoothing power fluctuations of a wind power generation system, and belongs to the technical field of control in new energy power generation. Background technique [0002] In today's society, energy and the environment are getting more and more attention. At the same time, new energy distributed power generation technology has also developed rapidly. In new energy distributed power generation, wind power is a major form of power generation. However, wind power is affected by changes in the natural environment, and its output active power is often fluctuating and intermittent. When they are connected to the grid on a large scale, it will have a great negative impact on the stability of the grid. Therefore, it is imperative to study the control method to stabilize the fluctuation of wind power output power. [0003] At present, hybrid energy storage is mostly used to stabilize wind farm power fluct...

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Problems solved by technology

This control method is simple in principle and fast in calculation speed, but the construction of the energy storage system and the cost of power generation are not considered in the actual system operation process, and the economy is poor; at the same time, the traditional control method cannot ensure that the output power after stabilization meets the specified requirements. Grid-connected indicators, the target of stabilization is poor

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