Voltage balancing control method of input-series and output-parallel combined converter

Abstract

The invention discloses a voltage balancing control method of an input-series and output-parallel combined converter. The method comprises the following steps: 1) collecting sampling signals of the input voltage of each sub-module in the combined converter and the total output voltage Vo of the converter; 2) setting a reference signal; 3) adding the reference signal Vref into the sampling signal of the input voltage of each module so as to obtain the reference signal of each module, or subtracting the sampling signal of the total output voltage and the sampling signal of the input voltages so as to obtain an adjusted output voltage signal of each module; and 4) comparing vrefi with vof, or comparing vofi with Vef, and generating PWM (pulse-width modulation) wave driving switch components by the comparative results through an output voltage regulator. According to the method, each module is completely independently and equally controlled according to self input and output information, so that the modularization design is realized, and the method has high system reliability. Furthermore, each module can be independently designed with control loop parameters, so that the parameter design is convenient.

Description

technical field [0001] The invention relates to a non-interconnected voltage equalization control method for an input series output parallel combined converter based on the upturning characteristic of output voltage, which belongs to the field of DC voltage conversion. Background technique [0002] With the rapid development of power electronic technology, power electronic devices are developing in the direction of high frequency, modularization and integration. Multiple standardized converter modules are combined in series and parallel to form various power electronic devices that meet different needs. A research hotspot of electronic system integration technology. Input-Series Output-parallel (ISOP) combined converter, as a type of multi-module series-parallel combined converter, is very suitable for high-voltage input, low-voltage and high-current output applications, such as rail transit and other industries. [0003] For the ISOP combined converter, the key issue is to...

AI Technical Summary

Problems solved by technology

[0004] The first type of natural voltage equalization / current equalization schemes mostly adopt the same duty ratio control strategy. The advantage of this type of scheme is that it is simple to control and does not require a special voltage equalization link. Converters with low modularity, such as shared transformers, output filter inductors and control links, etc.

[0005] By adding the pressure equalization control loop, the problems existing in the natural pressure equalization / current equalization scheme can be better solved, but the disadvantage is that each module still shares the control link, and the system scalability is poor, which is far from the direct combination of standardized modules. still a certain distance

When the control interconnection line fails or is disturbed, it will affect the performance of the entire system, and even cause it to be paralyzed, which reduces the reliability of the system to a certain extent

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