High anti-interference fast response control system and method for resonance type DC-DC converter

Abstract

The invention provides a high anti-interference fast response control system and method for a resonance type DC-DC converter and belongs to the technical field of advanced control of efficient power conversion systems. The system comprises a tracking differentiator, a linear expansion state observer and a sliding mode controller; the tracking differentiator outputs a tracking signal, a first-orderdifferential signal and a second-order differential signal according to a received voltage reference signal; the linear expansion state observer obtains a first estimation state, a second estimationstate and estimation disturbance according to a received signal, and then obtains a first error signal and a second error signal; the sliding mode controller outputs a control signal according to a preset sliding mode control law, the received first error signal, the received second error signal, the received second-order differential signal and the estimated total disturbance, and generates a PWMdriving signal through a driving generator to drive the switching tube of the converter to act. The method has the high anti-interference characteristic of active disturbance rejection control and the fast dynamic response characteristic of sliding mode control, and can effectively relieve a buffeting problem easily caused by traditional sliding mode control.

Description

technical field [0001] The present disclosure relates to the field of advanced control technologies for high-efficiency power conversion systems, and in particular to a high-disturbance and fast-response control system and method for a resonant DC-DC converter. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Resonant DC-DC converters have natural soft switching characteristics, high efficiency and power density, and are widely used in fields such as electric vehicle charging and discharging. Among them, the LLC resonant DC-DC converter has a wide range of soft switching, low switching loss, large output voltage range, and easy magnetic integration of resonant inductors and transformers, and has become a research and application hotspot. [0004] The electric vehicle charging system is generally composed of AC-DC and DC-DC. The DC-DC con...

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Problems solved by technology

[0005] The inventors of the present disclosure found that although the LLC resonant converter has the above-mentioned advantages, due to the existence of multiple resonant elements, its operation process is complicated, the voltage gain is nonlinear, and the order of the mathematical model is high, which makes it difficult to establish an accurate model; at the same time, it is susceptible to Input voltage fluctuations, resonant component parameter drift, load changes and other disturbance effects, the model is time-varying, and precise control is difficult

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