Voltage control method for single-phase cascaded converter

A voltage control method and voltage control technology are applied in the field of multi-level converters, which can solve problems such as unfavorable system expansion and complex control schemes, and achieve the effect of improving dynamic performance.

Active Publication Date: 2022-03-01
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since the ports of the processor are fixed and there is an upper limit, the interconnection lines and control schemes between the H-bridge modules will

Method used

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  • Voltage control method for single-phase cascaded converter
  • Voltage control method for single-phase cascaded converter
  • Voltage control method for single-phase cascaded converter

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Embodiment Construction

[0042] Below in conjunction with embodiment the present invention is described in further detail:

[0043] Such as Figure 1 to Figure 10 As shown, a single-phase cascaded converter voltage control method includes the following steps:

[0044] Step 1: The circuit schematic diagram and control block diagram of the single-phase cascaded H-bridge rectifier are as follows figure 1, and control each H-bridge module separately. Set the first H-bridge module as the current control module, and the remaining H-bridge modules as the voltage control module. The current control module can not only control the grid-side current of the first H-bridge module, but also control the DC-side voltage of the module. The voltage control module only controls its DC side voltage.

[0045] Step 2: In the current control module, the DC side voltage value of the module is sampled by the subprocessor, and the DC side output voltage u of the module is sampled dc1 with a given DC voltage reference T...

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Abstract

The invention discloses a voltage control method for a single-phase cascaded converter, which relates to the technical field of multi-level conversion and comprises the following steps of: enabling a first H-bridge module to be a current control module and the rest to be voltage control modules. When the H-bridge module is used as a rectifier, the current control module samples DC-side output voltage of the H-bridge module, compares the DC-side output voltage with a given DC voltage reference value, multiplies the DC-side output voltage with a grid-side voltage phase signal through the first PI regulator to obtain a grid-side current reference value, compares the grid-side current reference value with a grid-side current to obtain a current error signal, and outputs the current error signal through the second PI regulator. And the modulation ratio for controlling the H-bridge module is obtained. The voltage control module samples the DC side output voltage of the module and compares the DC side output voltage with a given DC voltage reference value to obtain a voltage error signal, the voltage error signal is multiplied by a network side voltage phase signal through a PI regulator, the modulation ratio for controlling the H-bridge module is obtained, and then a switching tube is driven to work. According to the invention, the direct-current side voltage can follow the given voltage, and the unit power factor operation of the grid-side system is ensured.

Description

technical field [0001] The invention relates to the technical field of multilevel current conversion, in particular to a voltage control method for a single-phase cascaded converter, which is used to control the voltage of the single-phase cascaded converter when the load is unbalanced. Background technique [0002] In recent years, with the continuous improvement of the voltage level of high-power high-voltage semiconductor switching devices, multi-level converter technology has also developed rapidly in terms of topology and control theory, and has gradually become key research object. Among them, the cascaded H-bridge converter, as a typical representative of multilevel converters, is widely used in power electronic transformers, reactive power compensation and active filtering and other fields. It is used as a rectifier, and it has attracted the attention of the industry due to its advantages of modularization, scalability, separate power supply for different DC links, ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/26H01J1/14H02J5/00
CPCH02J3/18H02J3/26H01J1/14H02J5/00H02J2203/20Y02E40/30Y02E40/50
Inventor 王立乔陈旭晨范振宇
Owner YANSHAN UNIV
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