Charging and discharging control method of energy storage system in wind farm based on Kalman filter

Abstract

The invention relates to a method for controlling charging and discharging of an energy storage system in a wind power plant based on Kalman filtering, and belongs to the technical field of controlling over power systems. The method comprises the steps of firstly calculating a prior estimated value of the combined output power of a wind power generation system and the energy storage system in the wind power plant at the time k, and a prior estimated value of the calculation error covariance, calculating the current power fluctuation quantity of the wind power generation system, determining an observation noise covariance value according to the current power fluctuation quantity, correcting the prior estimated value of the combined output power according to a measured value of the power of the wind power generation system at the time k, obtaining a posterior estimated value and a posterior estimated value of the calculation error covariance, and calculating the upper limit and the lower limit of the output power of the energy storage system in the wind power plant at the time k according to the residual energy and the limit value of the output power of the energy storage system. According to the method, the condition of wind power fluctuation and the condition of the energy and power of the energy storage system are considered comprehensively, and parameters of a filer are adjusted in a self-adaption mode so that the better filtering effect can be achieved, and meanwhile the needed capacity of the energy storage system can be reduced.

Description

technical field [0001] The invention relates to a method for controlling charging and discharging of an energy storage system in a wind farm based on a Kalman filter, and belongs to the technical field of power system control. Background technique [0002] The fluctuation and uncertainty of wind turbine output also make the safe and stable operation of the power system face severe challenges. With the increase of grid-connected capacity, its impact is becoming more and more significant. After wind power is connected to the grid, it is easy to cause system power imbalance, frequency deviation and other problems. Configuring energy storage systems in wind farms to smooth wind power output can effectively reduce the adverse effects of wind power fluctuations and uncertainties on grid operation. [0003] Due to the relatively high cost of the energy storage system, the energy storage capacity configured in the wind farm is often limited. It is necessary to set a reasonable char...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a charging and discharging control method for an energy storage system in a wind farm based on Kalman filtering, so as to ensure the smooth effect of the output power of the wind power generation system and overcome the problem of large capacity of the energy storage system required in the existing method. question

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