Method and device for controlling three-phase interleaving Boost converter

Abstract

The invention discloses a control method and device of a three-phase interleaving Boost converter. The method comprises the following steps: under the condition that the power of a motor is constant, enabling an inverter at the rear stage of a Boost converter and a permanent magnet synchronous motor to be equivalent to resistors, and establishing a system state equation; decomposing each state variable into the sum of a direct current component and tiny disturbance, and performing small signal analysis to obtain an internal model control object model; and based on an internal model controller, determining a current loop internal model controller and a voltage loop internal model controller according to the internal model control object model. According to the embodiment of the invention, under the condition that the motor power is constant, the rear-stage inverter and the permanent magnet synchronous motor are equivalent to resistors, inductors and switch tube inner resistors are ignored, a small signal model of the three-phase interleaving Boost converter is established, current loop and voltage loop internal model controllers are designed based on the small signal model, the difficulty of online debugging of the system is reduced, and the robustness of the system is improved.

Description

technical field [0001] The invention relates to the technical field of control of Boost converters, in particular to a control method and device for three-phase interleaved parallel Boost converters. Background technique [0002] In recent years, electric vehicle technology has developed rapidly, and energy management, as one of the core key technologies of new energy vehicles, has attracted much attention. As one of the core components of energy management in electric vehicles, the Boost converter can provide different bus voltages according to different working conditions, thereby improving the efficiency of the electric drive system. However, in the cascaded electric drive control system after the pre-Boost converter, if the Boost converter control strategy is not properly designed, the rapidity and robustness of the system will deteriorate. Large fluctuations, which affect the safety of the entire drive system. Therefore, the research on the control strategy of the Boo...

AI Technical Summary

Problems solved by technology

However, the frequency domain characteristics of the right half plane zero point will appear in the Boost converter in the continuous current mode, which belongs to the non-minimum phase system

The position of the right-half-plane zero point in the Boost converter system depends on the average value of the inductor current. A positive change in the inductor current will move the right-half-plane zero point to low frequency, resulting in a lag in the output voltage and increased ripple

The traditional PI control used in the non-minimum phase system can not solve the problem of poor dynamics and stability caused by the right half plane zero.

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