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MMC bidirectional DCDC converter for super capacitor energy storage system

An energy storage system and supercapacitor technology, which is applied in current collectors, regulating electrical variables, and control/regulating systems, etc., can solve the problems of energy storage systems that are difficult to connect single units or components in series, and the large discreteness of parameters of single components of super capacitors. , to reduce the volume and weight, increase the ripple frequency, and reduce the voltage

Inactive Publication Date: 2017-06-20
田佳聪
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the parameters of supercapacitor single components are highly discrete, and the system consisting of multiple monomers in series needs to consider the problem of voltage balance.
Due to the limitation of balance, it is difficult for the energy storage system to use a large number of cells or components in series

Method used

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  • MMC bidirectional DCDC converter for super capacitor energy storage system
  • MMC bidirectional DCDC converter for super capacitor energy storage system
  • MMC bidirectional DCDC converter for super capacitor energy storage system

Examples

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Embodiment Construction

[0017] figure 1 In it, the lower half-bridge arms of the N half-bridge topology are connected in series to the DC grid side, and the two ends of the bridge arms are connected to the super capacitor bank (i=1,2,...,N) through the LC filter. Due to the small filter inductance, it can be ignored in theoretical analysis. The voltage at both ends of the switching device in the topology is determined by the terminal voltage of the supercapacitor bank, and the maximum voltage at the serial port of the module is determined by the terminal voltage of the supercapacitor of the module. When the supercapacitor bank is in the energy-discharging state, the bidirectional DC-DC converter works in step-down mode. The upper-bridge switch tube, lower-bridge diode and inductor L of the half-bridge module form a Buck converter, and the energy of the supercapacitor bank is transferred to DC bus side. When the switch tube is turned on and off, the circuit works in two modes respectively. When the...

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Abstract

The invention discloses an MMC bidirectional DCDC converter for a super capacitor energy storage system. The MMC bidirectional DCDC converter comprises four parts: an MMC energy storage system, single current loop control, grading ring control and energy control. A system achieves current and voltage equalization decoupling control, and provides a modular double closed-loop decoupling control strategy. Based on the independent DC grid voltage control target, an energy storage management strategy based on grid-side voltage and the super capacitor SOC is provided. The system can help to reduce the contradiction between the low voltage of a super capacitor individual and the high voltage of an application occasion. The MMC-based energy storage system increases the ripple frequency of the inductive current by N times while reducing the voltage and the current stress of a switch device, and has great help to reduce the volume and the weight of the inductor.

Description

technical field [0001] The invention relates to a bidirectional DCDC converter, in particular to an MMC bidirectional DCDC converter used in a supercapacitor energy storage system. Background technique [0002] Supercapacitor is an important energy storage component, which has the characteristics of high power density, high charge and discharge efficiency, and long cycle life. It has broad application prospects in microgrid systems, new energy power generation, and braking energy absorption and utilization systems. [0003] In high-voltage, large-capacity supercapacitor energy storage applications, due to the low voltage of energy storage capacitor cells (or components connected in series with capacitor cells), it is usually necessary to form a system by connecting multiple cells or components in series. However, the parameters of supercapacitor single components are relatively discrete, and the system consisting of multiple monomers in series needs to consider the problem o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02J7/34
Inventor 田佳聪
Owner 田佳聪
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