A Multivariable Feedback Controlled LC Converter

Abstract

The invention discloses an LC converter and method for multivariable feedback control, comprising a first adder, a second adder, a third adder, a fourth adder, a d-axis controller, a q-axis controller, a d-axis controller, and a d-axis controller. axis compensator and q-axis compensator; the input end of the d-axis controller is connected to the output end of the first adder, the first input end of the third adder is connected to the output end of the d-axis controller, and the second input end is connected to To the output end of the d-axis compensator, the input end of the d-axis compensator is connected to the state quantity; the output of the third adder is the d-axis modulation signal; the input end of the q-axis controller is connected to the output end of the second adder, and the fourth The first input end of the adder is connected to the output end of the q-axis controller, the second input end is connected to the output end of the q-axis compensator, and the input end of the q-axis compensator is connected to the state quantity; the output of the fourth adder is the q-axis Modulated signal. The invention has the characteristics of good stability, high steady-state precision, small dynamic response fluctuation and fast speed.

Description

technical field [0001] The invention belongs to the field of LC converters, and more specifically relates to an LC converter and method for multivariable feedback control. Background technique [0002] The three-phase power supply in power equipment is widely used and the demand is increasing day by day. At the same time, higher index requirements are put forward for the quality of power supply. In order to control the active and reactive components separately, three-phase converters often choose to implement control in the rotating coordinate system, and the inherent DC command of the traditional PI controller in the rotating coordinate system has the ability to track without static error. However, the coupling term introduced by the coordinate transformation between the rotating coordinate axes will make the system unable to achieve true independent control of the active and reactive components, and will reduce the output performance of the converter. The mathematical mod...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide an LC type converter with multivariable feedback control, which aims to solve the problem of weak stability in the prior art due to the weak damping of the LC type converter, and the The problem of poor output voltage quality caused by the introduction of coupling when implementing control in the dq-axis rotating coordinate system

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