Buck-Boost converter variable damping passive control method based on port controlled dissipation Hamiltonian model

Abstract

The invention discloses a Buck-Boost converter variable damping passive control method based on a port controlled dissipation Hamiltonian model. The method comprises the following steps of 1, according to the system state averaging model and the state variables of a Buck-Boost converter, converting the system state averaging model of the Buck-Boost converter into a port controlled dissipation Hamiltonian model form, and verifying the passivity of the port controlled dissipation Hamiltonian model form; 2, according to the port controlled dissipation Hamiltonian model of the Buck-Boost converterand an interconnection and damping distribution passive control method, giving an expected interconnection and damping matrix and carrying out passive controller design; 3, designing a second-order differential tracker according to the influence of the damping coefficient change of the given damping matrix on the system performance, and realizing the real-time change of the injection damping; 4,designing a variable-damping passive controller according to the passive controller and the second-order differential tracker, and controlling the output voltage of the Buck-Boost converter. Accordingto the invention, by means of the control method, the output voltage of the Buck-Boost converter can be quickly converged to the expected output voltage. The steady-state error of the output voltageis reduced, and the overall performance of the system is improved.

Description

technical field [0001] The invention relates to a Buck-Boost converter passive control method, in particular to a Buck-Boost converter variable damping passive control method based on a port-controlled dissipation Hamiltonian model. Background technique [0002] The DC-DC converter is the core of the DC switching converter. Its characteristic is that the input voltage and the output voltage are both DC voltages. Its function is to pass the input DC voltage through the conversion circuit to make the system output the desired DC voltage. DC-DC converters can be divided into transformers without isolation and transformers with isolation according to whether there is electrical isolation between the input and output. Among them, the Buck-Boost converter is the most basic non-isolated DC converter. Because of its wide input voltage range, small input current ripple, and the output voltage can realize buck-boost control, it is widely used in the field of power electronics. . [...

AI Technical Summary

Problems solved by technology

[0005] The injection damping item of the traditional interconnection and damping configuration passive control method is a constant value, but the value of the injection damping affects the performance of the controller. If the damping injection is too small, the response speed will be accelerated, but there will be overshoot and large The steady-state error; if the damping injection is too large, the response speed will slow down, but there is no overshoot, and the steady-state error is small

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