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Multi-level converter control method and device

A technology of a multi-level converter and a control method, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problem of inaccurate current phase, module voltage runaway, and small control amount and other problems, to achieve the effect of stable output power, moderate amplitude and good effect

Active Publication Date: 2022-01-14
TBEA XIAN ELECTRIC TECH +1
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Problems solved by technology

Existing algorithms generally use the method of multiplying the current measurement value or its phase sign with the voltage control quantity. When the current of the multilevel converter is small, the control quantity will be too small to cause the module voltage to run out of control or the current phase is inaccurate to cause power oscillation. The problem

Method used

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  • Multi-level converter control method and device

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Embodiment Construction

[0034] In order to make the purpose and technical solution of the present invention clearer and easier to understand. The present invention will be further described in detail below in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular ori...

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Abstract

The invention discloses a multi-level converter control method and device. The method comprises the steps of carrying out calculation according to a capacitor voltage value of each module in a multi-level converter and a current value of the multi-level converter, outputting an adaptive control current, and outputting a modulation wave of each module of the multi-level converter according to the control current. According to the multi-level converter control method, multi-level converter control can be realized, and the method has the advantages of wide current application range and good DC voltage control effect.

Description

technical field [0001] The invention belongs to the technical field of electric or electronic system control, and in particular relates to a method and device for controlling a multilevel converter. Background technique [0002] With the large-scale access of new energy to the power system, multi-level converters are becoming more and more widely used in high-voltage and large-capacity fields such as active power filters, static var generators, and energy storage converters. application. The control system of the multilevel converter is complex, not only must have the current control, but also needs to realize the DC voltage control of each module. DC voltage control achieves the purpose of controlling the DC voltage balance of each module by adjusting the active power absorbed by each module; generally, the voltage of each module is fine-tuned along the current direction of the multi-level converter, and the fine-tuning amount is superimposed on the original modulation wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387H02M1/088
CPCH02M7/483H02M7/5387H02M1/088
Inventor 孙君朋周洪伟吕琳万萌赵勇涛刘静高原
Owner TBEA XIAN ELECTRIC TECH
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