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Energy control method of multi-port alternating-current and direct-current hybrid microgrid system

A technology of AC-DC mixing and energy control, which is applied to AC network circuits, DC circuits with more than three wires, and DC network circuit devices, etc., to achieve the effects of reducing system volume, avoiding conversion process, reducing hardware cost and power loss

Active Publication Date: 2021-01-01
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of industries such as ships and mines, traditional low-voltage power cannot meet their power supply needs, and the demand for various medium-voltage DC power is further increasing. Medium-voltage DC microgrids have gradually become the main source of power supply for the above occasions [9][10]

Method used

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  • Energy control method of multi-port alternating-current and direct-current hybrid microgrid system
  • Energy control method of multi-port alternating-current and direct-current hybrid microgrid system
  • Energy control method of multi-port alternating-current and direct-current hybrid microgrid system

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Embodiment 2

[0086]The solution in Embodiment 1 will be further introduced below in conjunction with specific calculation formulas, drawings, and examples. For details, see the following description:

[0087]Step 201: Propose a four-port AC / DC hybrid microgrid interconnection scheme;

[0088]figure 1 Shown is a four-port AC / DC hybrid microgrid interconnection scheme. The scheme includes: 1 AC (alternative current, AC) port, 1 medium voltage direct current (MVDC) port and 2 low voltage DC (low voltage direct current, LVDC) port. For the proposed hybrid microgrid system, the interface converter includes 24 half-bridge sub-module modular multilevel converters (modular multilevelconverter, MMC) and 24 dual active full bridge converters (dual active bridge, DAB). MMC is used to convert alternating current to direct current, while dual active full-bridge converters are used to regulate the voltage of the low-voltage direct current port and realize direct current transmission. For MMC, it consists of 6 bridg...

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Abstract

The invention discloses an energy control method of a multi-port alternating-current and direct-current hybrid microgrid system. According to an alternating-current loop in the model, capacitor voltages in the modular multilevel converter, the dual-active full-bridge converter and the sub-modules and output currents on the alternating-current side are controlled through total energy control and alternating-current output current control; according to a direct-current loop in the model, the sum of the capacitor voltages of the upper bridge arm and the lower bridge arm of each phase is controlled through interphase energy control, and a direct-current component of circulation reference is obtained; the difference between the capacitor voltages of the sub-modules between the upper bridge armand the lower bridge arm in the same phase is balanced through inter-arm energy control, and a fundamental frequency alternating current component of circulation reference is obtained; direct currentand fundamental frequency alternating current components in the modular multilevel converter are tracked through a circulation controller, inherent frequency doubling current is suppressed, and capacitance energy in a bridge arm is adjusted; through phase-shifting carrier modulation, modulation signals of the sub-modules are adjusted, and capacitance and voltage balance of the sub-modules is achieved.

Description

Technical field[0001]The invention relates to the technical field of application of a multi-level converter to a micro-grid system, in particular to an energy control method of a multi-port AC / DC hybrid micro-grid system.Background technique[0002]In recent years, with the rapid development of the global economy, the consumption of energy such as coal and oil has also increased. The large-scale use of traditional energy makes it face the problem of shortage of supply, and it also brings a series of negative effects to the environment. Renewable energy has the characteristics of being clean, high-efficiency and renewable, and has attracted great attention worldwide. With the support of governments around the world, distributed power generation technology has developed rapidly. Currently, more mature technologies include: photovoltaic power generation, fuel cell power generation, micro gas turbine power generation, wind power generation, etc.[1]. In the past ten years, academic and ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/02H02J3/06H02J3/24H02J3/26H02J1/08G06F30/30G06F113/04
CPCG06F30/30G06F2113/04H02J3/02H02J3/06H02J3/24H02J3/26H02J5/00H02J1/082H02J2203/10H02J2203/20Y02E40/50
Inventor 肖迁贾宏杰穆云飞侯恺余晓丹
Owner TIANJIN UNIV
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