Charging/discharging control method of wind farm energy storage device

Abstract

A charging / discharging control method of a wind farm energy storage device is characterized by controlling the charging / discharging power of the energy storage device in a wind storage integrated system based on the prediction error of a wind farm power, monitoring the change of a wind farm actual output Pmk and a wind farm prediction output Ppk in a real-time on-line manner to obtain an actual relative error epk, taking a relative error value beta=25% as the demarcation point of the energy storage huff and puff power Psk and the standby control, using an energy storage device comparator to send a control signal to an energy storage device controller according to the comparison result of the actual relative error epk and the relative error value beta, and using the energy storage device controller to control the energy storage device to charge and discharge.

Description

technical field [0001] The invention relates to a charging and discharging control method for an energy storage device in an integrated wind storage system. Background technique [0002] Due to the fluctuation and intermittency of wind, the fluctuation and intermittency of wind power will affect the stability of local grid voltage and power quality. So far, researchers have proposed a variety of solutions, which can be divided into two categories: one is to smooth the output power of the wind turbine by adjusting the operating state, which can be classified as direct power control, but this method is not suitable for wind speed fluctuations. The power regulation capability of the wind farm is limited; the second is to smooth the output rate of the wind farm through additional energy storage equipment, which can be classified as indirect power control. This method can achieve a wide range of power regulation and effectively suppress the output power of the wind farm. fluctua...

AI Technical Summary

Problems solved by technology

[0006] At present, a lot of research has been done on the technical performance of different types of energy storage devices and their application in wind power grid integration at home and abroad, and some achievements have been made, but most of these studies focus on the application of a single energy storage device in wind power grid integration. , and it is rare to discuss the methods and principles of energy storage to improve the accuracy of wind power forecasting on the basis of considering the technical and economic characteristics of specific types of energy storage devices, combined with the performance of the power grid, which needs to be further in-depth

Chinese patents 201120143895 and 201010555730 are aimed at various types of small-scale and low-power energy storage devices, based on a certain mathematical model and controlling their charge and discharge according to the preparation process of the energy storage device and its own electrical and physical characteristics, so these energy storage methods The application range is narrow and the application occasions are limited. There are few charging and discharging control methods applied to paralleling a single energy storage device into a large-scale energy storage system, and there are very few charging and discharging control methods applied to energy storage devices in wind farms.

Images