Load frequency control method of wind-diesel hybrid power system based on sliding mode control

Abstract

The invention relates to a wind power and diesel hybrid electric power system load frequency control method based on sliding-mode control. The method comprises the following steps: (1) output power of a wind power generation subsystem serves as control input of a diesel engine subsystem, meanwhile, output power of the diesel engine subsystem is controlled by means of a sliding-mode control method based on a BP neural network observer, a system state equation is established, and the control input u (t) of the diesel engine subsystem in a hybrid electric power system is calculated through a sliding-mode controller; (2) the control input u2 obtained by means of calculation through the sliding-mode controller in the step (1) is used as a control instruction of the wind power generation subsystem, a PID variable pitch control method is adopted for controlling output power of a wind driven generator according to the control instruction, and frequency deviation of the whole hybrid electric power system is reduced. Compared with the prior art, the wind power and diesel hybrid electric power system load frequency control method based on sliding-mode control has the advantages of being high in control accuracy, capable of effectively reducing electric power system load frequency deviation, and the like.

Description

technical field [0001] The invention relates to a method for controlling the load frequency of a power system, in particular to a method for controlling the load frequency of a wind-fired diesel hybrid power system based on sliding mode control. Background technique [0002] In recent years, the pollution of the environment by traditional power generation forms such as thermal power has become increasingly serious, and in the context of the rapid depletion of traditional energy sources, new energy sources such as wind energy and solar energy have attracted more and more attention and research. However, areas rich in new energy resources are generally relatively remote, such as wind resources in islands and solar resources in Xinjiang are very rich. Due to the inconvenient transportation in remote areas and isolated islands, the large power grid cannot provide continuous power supply to them. In this way, these areas will be more equipped to vigorously develop and utilize ne...

AI Technical Summary

Problems solved by technology

The document "Atsushi Yona, Hideomi Sekine, Chul-Hwan Kim, Output power control for large wind power penetration in small power system, Renewable Energy, 2009" aimed at the single-domain wind-diesel hybrid power system, through the fuzzy control method to realize the wind power output power frequency adjustment, but this must reduce the penetration rate of wind power. Although the method is feasible, it does not make full use of new energy

Images