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Energy control method for improving grid-connected capacity of distributed energy in weak grid

A distributed energy and energy control technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of no distributed energy energy transmission control and compensation methods.

Inactive Publication Date: 2019-08-30
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no control and compensation method for distributed energy energy transmission under weak grid

Method used

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  • Energy control method for improving grid-connected capacity of distributed energy in weak grid
  • Energy control method for improving grid-connected capacity of distributed energy in weak grid
  • Energy control method for improving grid-connected capacity of distributed energy in weak grid

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Embodiment Construction

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the patent of the present invention, and cannot be construed as limiting the patent of the present invention. All modifications made according to the spirit of the main technical solutions of the present invention shall fall within the protection scope of the present invention.

[0040] Below in conjunction with accompanying drawing, content of the present invention is described in further detail:

[0041] An energy control method for improving the grid connection capability of distributed energy sources under a weak grid, including various components and line connection methods, related parameter detection, and po...

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Abstract

The invention provides an energy control method for improving grid-connected capacity of distributed energy in the weak grid. The method is specifically characterized in that two back-to-back converters are connected together through a bus capacitor, the converter I is used for maintaining stability of a DC bus voltage, the converter II is used for transmitting energy according to line needs, a compensation voltage of a certain amplitude and a certain phase is outputted, an approximate decoupling control strategy is proposed for a power loop of the converter II, and the invention further includes a method for line voltage, current and impedance detection. The method is advantaged in that under the weak grid, problems that grid impedance is large, the transmission line is long, the grid-connected capacity of the distributed energy is poor, grid voltage distortion occurs when the grid is connected, and the energy cannot be reliably transmitted to the grid are solved. The amplitude-variable phase-variable voltage is generated by the converter II, a transformer connected in series on the line is coupled with the line, so the voltage amplitude and the voltage phase of a common connection point are variable, and thereby the distributed energy is finally controllably transmitted to the grid.

Description

technical field [0001] The patent of the invention discloses an energy control method for improving the grid-connection capability of distributed energy sources under a weak grid, and relates to the fields of energy control of active terminal grids and power electronics. Background technique [0002] With the extensive use of non-renewable energy, energy is facing the problem of increasing depletion, making distributed energy such as photovoltaics and wind power widely used. However, since distributed energy is generally located in remote areas, in order to transmit its energy to peak power consumption areas, three-phase grid-connected inverters or power stations are generally used to transmit energy to the grid. At this time, the connection to the grid requires long-distance power transmission Lines and a large number of transformer devices, such a transmission network causes high line impedance between distributed energy grid-connected nodes and the grid, so the grid under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381
Inventor 李浩昱王嘉楠
Owner HARBIN INST OF TECH
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