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Direct-current power spring topology and control method thereof

A technology of electric springs and direct current, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problems of large-scale, high-proportion distributed power generation grid connection, etc., to reduce charging and discharging power, simple control , the effect of improving reliability

Active Publication Date: 2015-12-30
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, similar to the control method of the current AC power supply system, the control of the DC grid is based on centralized control, which cannot meet the requirements of large-scale and high-proportion distributed generation in the future smart grid.
Although the Electric Spring (ES), which came out a few years ago, can be widely used in distributed power generation systems, the advent of ES is mainly for the application of AC microgrids, and there is no DC / DC converter based on it. Related reports on DC microgrid application of electric spring (DirectCurrentElectricSpring, DCES)

Method used

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  • Direct-current power spring topology and control method thereof
  • Direct-current power spring topology and control method thereof
  • Direct-current power spring topology and control method thereof

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Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the accompanying drawings.

[0024] Such as figure 2 As shown, a DC power spring topology includes a bidirectional DC / DC converter, a unidirectional DC / DC converter, a first single-phase H-bridge, a second single-phase H-bridge, a first filter capacitor C 1 , the second filter capacitor C 2 and the DC source V dc . DC source V dc It can be battery, bidirectional AD / DC or DC / DC power supply.

[0025] Among them, the bidirectional DC / DC converter includes an antiparallel diode D 1 The first open tube Q 1 , antiparallel diode D 2 The second switching tube Q 2 and the first inductor L 1 . The first inductance L 1 Connect one end of the first open tube Q at the same time 1 The drain and the second switching tube Q 2 source, the first inductor L 1 the other end and the first open tube Q 1 The source of the bidirectional DC / DC converter is used as the input, the first inductor L 1 Connec...

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Abstract

The invention discloses direct-current power spring topology and a control method thereof, wherein definition of a critical load and a non-critical load is similar to current alternating-current ES. DCES is achieved by adopting a DC / DC convertor with bidirectional energy, and meanwhile the position of the non-critical load in current alternating-current ES is changed by adopting a concept of a direct-current transformer to enable the voltage of the non-critical load to be monotonously changed along with changes of the network voltage. When the direct-current voltage output by renewable energy power generation deviates from a normal value, DCES not only can guarantee that the critical load voltage precisely follows a set value, but also can transfer fluctuation of the direct-current voltage to the non-critical load, and therefore automatic balance of the voltage and the power is achieved. The direct current power spring topology and the control method thereof are especially suitable for a roof photovoltaic power generation system and a small wind power generation system and are particularly important to voltage stabilization of a direct-current power system and a direct-current micro grid. After the direct current power spring topology and the control method thereof are adopted, a common user can directly supply power to the critical load through self power generation.

Description

technical field [0001] The invention belongs to the technical field of smart grid operation control, and relates to a DC power spring topology structure applied to a DC power system and a DC microgrid and a control method thereof. Background technique [0002] The new energy microgrid represents the development trend of future energy and is an innovative application of "Internet +" in the energy field. For this reason, the National Energy Administration regards it as an important direction for the development of renewable energy and distributed energy in the renewable energy development plan. As an integral part of renewable energy micro-grids, DC micro-grids have also been gradually popularized and applied, and the state also has policy support for rooftop photovoltaic power generation. However, when a large number of distributed power generation is integrated into the grid, especially into the microgrid, due to the intermittent and unstable renewable energy such as solar ...

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 程明王青松姜云磊
Owner SOUTHEAST UNIV
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