Research On Adaptive Control Of Building Power Supply System Based On Filtered Backstepping Method

With the continuous development of social economy and urbanization,the electricity consumption of the three industries has increased significantly,and the electricity consumption of public buildings and civil buildings has exceeded 50% of the total electricity consumption.Considering the current situation of resource shortage in China,how to improve energy utilization rate and reduce energy consumption of building power supply becomes particularly important.With the rapid development of intelligent building technology,more resistive and inductive electrical automation equipment are connected to the building power supply system,which not only increases the reactive power loss in the power supply system,but also has a great impact on the stability and reliability of the power system.As a new reactive power compensation technology,the static reactive power compensator can effectively balance the reactive power of the power system,effectively reduce the power loss,improve the stability of the building power supply,and effectively control the low-frequency vibration of the system to a certain extent.In order to realize the stable operation of the building power supply system and improve the power quality of the user side,the building power supply system is equivalent to the single-machine infinite power system,and the stability control strategy of the single-machine infinite power system with static reactive power compensator is studied.The innovation of the paper is as follows:(1)In order to solve the problem that the convergence time of the system may approach infinity under the asymptotic stability control scheme,a finite-time fuzzy adaptive filtered backstepping method control strategy is proposed.Fuzzy logic system is used to approximate unknown nonlinear dynamics and external interference signals in the system.In order to estimate the derivative of virtual control signal in limited time,a new finite-time command filter is used.At the same time,the filter error compensation mechanism is designed to eliminate the filter error.The proposed control scheme can realize the control of generator power angle and speed amplitude in the building power supply system in limited time,and ensure the global uniform boundedness of the closed-loop system signals.(2)A full-state constrained finite-time fuzzy adaptive filtered backstepping control strategy is presented for the single machine infinite power system with static var compensator.A new state constrained finite-time virtual control signal is designed by combining the barrier Lyapunov functions and the adaptive filtered backstepping method.The proposed control scheme can converge the system tracking error in a limited time,while the state variables always satisfy the constraints.(3)An improved full-state constrained finite-time fuzzy adaptive filtered backstepping control strategy is designed for power systems with dead zone input and unknown control direction.The mathematical model of dead zone input is processed by linearization method,and the original system is transformed into a new system with feasible control design.Meanwhile,in order to solve the problem of unknown control direction of the system,the controller is designed by combining Nussbaum function.The proposed control scheme solves the problems of dead zone input and unknown control direction,ensures the finite-time stability of generator power angle,and does not violate state constraints.