High anti-interference fast-response control system and method for three-level NPC converter

Abstract

The invention discloses a high-anti-interference fast-response control system and method for a three-level NPC converter, and the method comprises the steps: defining a virtual control quantity of aninput current value on an active component d axis, carrying out the derivation of the virtual control quantity through a command filter, according to a derivation result, the output voltage value anda given output voltage value, obtaining a first reference value of the alternating-current side voltage on the d axis of the active component; obtaining a second reference value of the AC side voltageon the reactive component q axis according to the component of the input current value on the reactive component q axis and the given reactive current value; and modulating the first reference valueand the second reference value to generate a converter switch control signal. A command filtering backstepping control system comprising output voltage control and reactive current control is constructed, the output voltage and the reactive current track respective reference values, a command filter is introduced to replace a traditional backstepping control method to obtain a virtual control quantity derivative through calculation, the calculation burden is reduced, and global large-range stability is achieved.

Description

technical field [0001] The invention relates to the technical field of three-level NPC converter control, in particular to a high anti-disturbance and quick-response control system and method for a three-level NPC converter. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The charging system is an essential infrastructure for the development of electric vehicles. Thanks to its advantages of high power density, low cost and high efficiency, the 10kV DC charging system has become a hot spot in research and application. The front-end AC / DC of the 10kV DC charging system The converter generally adopts the method of cascading single-phase AC / DC converter modules. [0004] The single-phase three-level neutral point clamped converter (Neutral Point Clamped, NPC) is one of the ideal 10kV DC charging system front-end converter cascaded module topo...

AI Technical Summary

Problems solved by technology

[0004] The single-phase three-level neutral point clamped converter (Neutral Point Clamped, NPC) is one of the ideal 10kV DC charging system front-end converter cascaded module topologies. Its advantages include: low voltage stress of power switches, electromagnetic interference Small and low harmonics, etc.; for the front-end single-phase three-level NPC converter, the variable charging power will cause a large load disturbance, which will affect the DC bus voltage regulation performance and even endanger the system stability. Therefore, its The control requirements are good voltage tracking performance and anti-interference ability

[0005] However, the inventor found in the research that since the traditional PI control method is based on a linear model, it is difficult to ensure that the single-phase three-level NPC converter has excellent dynamic performance and stability in a large operating range, especially When there is a load disturbance, the DC bus voltage fluctuates greatly, it takes a long time to return to a steady state, and the charging quality is low

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