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A Capacitance-Voltage Classification Balance Control Method for Solid-State Transformers

A solid-state transformer, capacitor voltage technology, applied in control/regulation systems, instruments, electrical components, etc., can solve the problems of large communication requirements and high complexity of solid-state transformer control, and achieve the effect of improving communication capabilities, facilitating promotion, and easy implementation.

Active Publication Date: 2021-06-01
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to solve the problems of high control complexity and large communication requirements of solid-state transformers in high-voltage applications, provide a capacitor-voltage classification and balance control method for solid-state transformers

Method used

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  • A Capacitance-Voltage Classification Balance Control Method for Solid-State Transformers
  • A Capacitance-Voltage Classification Balance Control Method for Solid-State Transformers
  • A Capacitance-Voltage Classification Balance Control Method for Solid-State Transformers

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Experimental program
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Embodiment 1

[0023] figure 2It is a typical solid-state transformer circuit diagram. The solid-state transformer is a four-port solid-state transformer composed of a modular multi-level converter and an output parallel DC / DC converter. The DC side of each dual-capacitor module is connected to a dual-active H-bridge. Converters (DABs), one end of these DABs are connected in parallel to form a DC / DC converter with outputs connected in parallel. Among them, the AC and DC ports of the modular multilevel converter can be respectively connected to the high-voltage AC bus and the high-voltage DC bus. Connect the low-voltage DC bus. image 3 Shown is the overall control block diagram of the solid-state transformer realized in the modular multilevel converter with voltage balance between modules.

[0024] Under this topological structure and control strategy, the hierarchical capacitance voltage balancing method of the present invention is as follows: figure 1 As shown, it specifically includes...

Embodiment 2

[0034] Such as figure 2 Shown is the best embodiment of the multi-level voltage balance control method of the present invention in a typical solid-state transformer circuit. This figure is a four-port solid-state transformer composed of a modular multi-level converter and a DC / DC converter with outputs connected in parallel. . Among them, the AC and DC ports of the modular multilevel converter can be connected to the high-voltage AC bus and the high-voltage DC bus respectively. busbar. Figure 4 Shown is the overall control block diagram of the solid-state transformer in which the voltage balance between modules is realized in the output parallel DC / DC converter.

[0035] Under this topological structure and control strategy, the hierarchical capacitance voltage balancing method of the present invention is as follows: image 3 shown, including the following steps:

[0036] During the operation of the system, according to the designed sampling frequency, the controllers of...

Embodiment 3

[0045] Such as Figure 5 Shown is the best embodiment of the multi-level voltage balance control method of the present invention in other typical solid-state transformer circuits. transformer. Among them, the AC of the modular multilevel converter can be connected to the high-voltage AC bus, the module used is a dual-capacitor module, and the output DC port of the DC / DC converter with input in series and output in parallel can be connected to the low-voltage DC bus. The control block diagram and image 3 same.

[0046] Under this topological structure and control strategy, the hierarchical capacitance voltage balancing method of the present invention is as follows: figure 1 shown, including the following steps:

[0047] During the operation of the system, according to the designed sampling frequency, the controllers of each module measure and collect the capacitor voltage value U inside each module respectively. cij , where i represents the serial number of the module, an...

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Abstract

The invention discloses a capacitor voltage grading balance control method of a solid-state transformer. The capacitor voltage balance control strategy of the solid-state transformer composed of dual capacitor modules is used for grading control. The module controller balances the capacitor voltage inside the module, and the system main control The inter-module capacitor voltage is balanced in the converter. Although the calculation amount of the module controller is increased in the present invention, because only the comparison and logical operation are increased, the demand for hardware resources of the micro-controller is small; the hierarchical control reduces the communication requirements between the module controller and the main controller, The calculation amount of the main controller is reduced, and at the same time, the two-stage voltage balance control can perform calculations at the same time, which saves calculation time.

Description

technical field [0001] The invention relates to a capacitance voltage balance control method, in particular to a capacitance voltage gradation balance control method of a solid-state transformer. Background technique [0002] With the increasingly prominent contradiction between energy supply and demand, the development and effective utilization of renewable energy have been paid more and more attention. Energy Internet is an effective way to improve energy utilization efficiency, among which solid-state transformer is the core equipment. Solid-state transformers, also known as power electronic transformers or electronic power transformers, use multi-level converters and medium-high frequency transformers to achieve different forms, voltage conversions of different voltage levels, and bidirectional transmission of energy. They are environmentally friendly, small in size, and output voltage Good quality and other advantages have become an effective way of energy transmission...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 李东野赵剑锋
Owner NANJING INST OF TECH
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