Method for controlling frequency modulation of micro-grid battery energy storage system based on fuzzy control

Abstract

The invention discloses a method for controlling the frequency modulation of a micro-grid battery energy storage system based on fuzzy control, and belongs to the technical field of electric power system micro-grids. On the basis of the conventional proportion integration differentiation (PID) control, fuzzy control and an implementation mode thereof are introduced into the method, and the method comprises important components such as fuzzification, fuzzy rules, fuzzy reasoning, defuzzification, PID control and the like. According to the method, the micro-grid frequency deviation and the micro-grid frequency change rate are fuzzified into input of a fuzzy controller, PID control parameters of active power output control are output according to a fuzzy control rule, and an active power output reference value Pref of the battery energy storage system is finally output to control the active power output of the micro-grid battery energy storage system. Compared with the conventional PID control, the method has very strong adaptability to the switching of micro-grid parallel network / isolated network operational modes and to the nonlinearity and the time variability of electric network operational parameters, has a good dynamic response characteristic, and effectively improves the active power control accuracy of the battery energy storage system and the frequency stability of the micro-grid.

Description

technical field [0001] The invention belongs to the technical field of power system microgrids, and relates to a method for adjusting the active power of a battery energy storage device in a microgrid, in particular to a fuzzy control-based frequency modulation control method for a battery energy storage system in a microgrid. Background technique [0002] Microgrid is one of the important grid-connected forms of distributed energy generation. It refers to a small network formed by organizing scattered small power generation units (distributed power) in a certain area. It is a self-control, protection and management system. autonomous system. The grid-connected operation mode of the microgrid system is divided into two types: the network mode and the island mode. In the networking mode, the microgrid operates in parallel with the large power grid through the distribution network, forming a joint operation system of the large grid and the small grid. When the grid fails or ...

AI Technical Summary

Problems solved by technology

Power grid operating parameters are highly nonlinear and time-varying, and control parameter setting rules and calculations are more complex

[0009] 2. Poor adaptability

The system characteristics of the microgrid in the grid-connected operation mode and the isolated grid operation mode vary greatly, and the fixed frequency modulation control parameter setting cannot adapt to the switching between the microgrid grid-connected operation mode and the isolated grid operation mode;

[0010] 3. Poor control of transplantability

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