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A DC power spring topology and its control method

A technology of electric springs and control methods, which is applied in the direction of DC 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, control Simplicity and the effect of improving reliability

Active Publication Date: 2017-12-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 AC microgrid applications, and there is no implementation based on DC / DC converters. Related reports on the application of DC electric spring (Direct Current Electric Spring, DCES) in DC microgrid

Method used

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  • A DC power spring topology and its control method
  • A DC power spring topology and its control method
  • A DC power spring topology and its control method

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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 a DC power spring topology and a control method thereof. Among them, the definition of critical load and non-critical load is similar to the current AC ES. DCES is realized by energy bidirectional DC / DC converter, and also adopts the concept of DC transformer, which changes the position of non-critical loads in the current AC ES, so that the voltage of non-critical loads monotonically changes with the change of grid voltage. Variety. When the DC voltage output by renewable energy power generation deviates from the normal value, DCES can not only ensure that the key load voltage accurately follows the given value, but also transfer the fluctuation of the input DC voltage to non-critical loads, so as to realize the automatic balance of voltage and power . The invention is especially suitable for rooftop photovoltaic power generation systems and small wind power generation systems, and is particularly important for the voltage stability of DC power systems and DC microgrids. After adopting the invention, ordinary users can directly use their own power generation to supply power to key loads.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00
Inventor 程明王青松姜云磊
Owner SOUTHEAST UNIV
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