A Bidirectional DC-DC Control System Based on Hybrid Terminal Sliding Mode

Abstract

The invention relates to a bi-directional DC-DC control system based on a hybrid terminal sliding mode. The bi-directional DC-DC control system comprises a bi-directional DC-DC converter, a hybrid terminal sliding mode controller and a hysteresis comparator, wherein an input end of the bi-directional DC-DC converter is provided with an electric energy storage device, and an output end is provided with a load capacitor; the hybrid terminal sliding mode controller acquires inductive current in the bi-directional DC-DC converter and voltage signals at the output end, and a generated control signal is sent to a switch in the bi-directional DC-DC converter through the hysteresis comparator. Compared with the prior art, the bi-directional DC-DC control system has advantages of being rapid in convergence, increasing precision and the like.

Description

technical field [0001] The invention relates to a bidirectional DC-DC controller, in particular to a bidirectional DC-DC control system based on hybrid terminal sliding mode. Background technique [0002] Among the performance indexes of the control system, the convergence performance is a key one. However, in the research results obtained by most of the control design methods, the fastest convergence speed of the closed-loop system is exponential, and better convergence performance cannot be obtained. The reason is that they all discuss closed-loop systems that satisfy the Lipschitz continuous nature of the situation. Therefore, these control analysis and synthesis methods belong to infinite-time stability and control problems. From the perspective of control system time optimization, the control method that makes the closed-loop system converge in a limited time is the time-optimal control method. [0003] At present, the control of bidirectional DC-DC converter is main...

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Problems solved by technology

[0004] The bidirectional DC-DC converter includes nonlinear components such as energy storage elements and power switch tubes. It is a typical nonlinear system. At present, the DC converter is mainly based on the traditional linear sliding mode surface, and its form is the output voltage error and its derivative and The linear combination of its integrals, however, the convergence result of the sliding mode controller designed in this way is gradual convergence and there is a steady-state error, which makes the system state continue to approach and cannot reach its expected value, so it directly affects the output voltage of the bidirectional DC-DC converter Response speed and precision

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