Current reference value automatic adjustment switchover control method of power electronic converter

Abstract

The invention discloses a current reference value automatic adjustment switchover control method of a power electronic converter. The current reference value automatic adjustment switchover control method of the power electronic converter comprises the steps that 1 a switchover system model of the power electronic converter is built according to the work state of the converter; 2 a Lyapunov function of a switchover subsystem i is defined, a related matrix is calculated, and a Lyapunov function value of the subsystem i is obtained; 3 a switchover control rule is selected, and the subsystem with the maximum Lyapunov function is selected as the current subsystem; a current reference value is adjusted according to an output error, when a parameter is uncertain or input voltage and a load change, the current reference value is adjusted according to the rule, and the control method is achieved. The current reference value automatic adjustment switchover control method of the power electronic converter is simple in control process, is good in effect, guarantees overall control stability of the converter, has robustness on changes of the input voltage, the load and the like, and improves the response speed of output voltage.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion control, and relates to a switching control method for automatic adjustment of a current reference value of a power electronic converter. Background technique [0002] The power electronic converter is the key device to realize the conversion and effective utilization of electric energy. The power electronic converter forms a unified dynamic system by the interaction of the continuous variable system and the discrete event dynamic system. The circuit may be linear in each switching state, but Switching the switch state according to a certain rule makes the whole system become a discontinuous nonlinear system. [0003] The analysis and design of traditional power electronic converters use the small signal linearization method to obtain a linear model that ignores the switch state. Although this model can easily use the traditional frequency domain design method, the problem is th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a switching control method for automatic adjustment of the current reference value of the power electronic converter, which solves the problem that the switching controller needs to measure the input and load under the existing technical conditions, and the system structure is complicated and the cost is high.

Images