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SOC equalization method of super-capacitor energy storage unit integrated multi-level converter

A technology of super capacitor and energy storage unit, which is applied in current collectors, electrical components, battery circuit devices, etc., can solve the problems of sub-module capacitor voltage fluctuations, the inability of multi-level converters to work continuously and efficiently, and the inability to balance the SOC of energy storage units. Problems are well resolved, etc.

Inactive Publication Date: 2020-04-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the energy storage unit is added, the SOC balance problem of the energy storage unit cannot be well resolved, resulting in fluctuations in the capacitor voltage of the sub-modules, and the multilevel converter cannot continue to work efficiently

Method used

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  • SOC equalization method of super-capacitor energy storage unit integrated multi-level converter
  • SOC equalization method of super-capacitor energy storage unit integrated multi-level converter
  • SOC equalization method of super-capacitor energy storage unit integrated multi-level converter

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Such as figure 1 As shown, the SOC equalization method of a supercapacitor energy storage unit integrated multilevel converter provided by the present invention includes the following steps:

[0035] Step 1: Connect the controller with the supercapacitor energy storage unit modular multilevel converter;

[0036] Step 2: The controller collects the real-time voltage value of the supercapacitor of each sub-module in the modular multilevel converter of the supercapacitor energy storage unit;

[0037] Step 3: Use the following formula to calculate the SOC value of the super capacitor in each sub-module:

[0038]

[0039] where SOC i Indicates the SOC value of the i-th sub-module, i is the serial number of the sub-module, is the real-time voltage value of the supercapacitor in the i-th sub-module, SC i Indicates the supercapacitor in the i-th...

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Abstract

The invention provides an SOC equalization method of a super-capacitor energy storage unit integrated multi-level converter. Decoupling control between the alternating current side and the direct current side is achieved by analyzing the energy relation between alternating current output of the multi-level converter and the super-capacitor energy storage unit, and the purpose of super-capacitor SOC equalization is achieved while stable output of the alternating current side is achieved. Powerful guarantee is provided for continuous and efficient work of the converter on the basis of solving the problem of capacitor voltage fluctuation of sub-modules of a traditional modular multilevel converter.

Description

technical field [0001] The invention belongs to the technical field of multilevel converters, and in particular relates to an SOC equalization method for multilevel converters. Background technique [0002] Due to its high modularity, easy expansion and good output performance, modular multilevel converters are increasingly used in a wide range of fields. Especially in the field of high-voltage and high-power transmission, it is a breakthrough progress to use modular multilevel converters to control high-voltage and high-power motors to achieve high-efficiency and energy-saving operation of high-voltage and high-power motors. It has very important scientific research and industrial Value. [0003] It is found that when the modular multilevel converter operates under the condition of variable frequency (especially low frequency), the amplitude of the sub-module capacitor voltage ripple increases with the decrease of the phase current frequency, and the amplitude increases at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J7/34
CPCH02M7/483H02J7/345H02M7/4835
Inventor 申科赵国栋赵丹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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