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Redundant point of common coupling (pcc) to reduce risk of microgrid islanding

一种微电网、孤岛的技术，应用在微电网领域，能够解决电力潮流控制、稳定性和孤岛检测复杂等问题，达到低控制复杂性的效果

Active Publication Date: 2019-01-29
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple PCC connections can be provided to improve grid reliability, but power management, protection, power flow control, stability and islanding detection (at one PCC point) become more complex

Method used

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  • Redundant point of common coupling (pcc) to reduce risk of microgrid islanding
  • Redundant point of common coupling (pcc) to reduce risk of microgrid islanding
  • Redundant point of common coupling (pcc) to reduce risk of microgrid islanding

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Embodiment Construction

[0029] Embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments are shown. However, other embodiments in many different forms are possible within the scope of this disclosure. Rather, the following embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals refer to like elements throughout the various figures.

[0030] figure 1 An embodiment of a microgrid 100 is schematically illustrated. The microgrid includes at least one distributed generator (DG) 130, often multiple DGs 130, and possibly one or more loads. DG 130 can typically generate direct current (DC), which is why microgrids can typically be DC grids. The microgrid 100 comprises a first switch 111 configured for connecting the microgrid 100 to the first network line 121 at the first PCC 141 in the clo...

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Abstract

A microgrid connecting at least one distributed electricity generator includes a first switch configured for, in a closed position, connecting the microgrid to a first network line at a first point of common coupling (PCC) and for, in an open position, disconnecting the microgrid from the first network line at the first PCC; a second switch configured for, in a closed position, connecting the microgrid to a second network line at a second PCC, and for, in an open position, disconnecting the microgrid from the second network line at the second PCC; and a control unit configured for, when an islanding event has been detected when the second switch is in its closed position and the first switch is in its open position, acting to close the first switch, bringing it to its closed position.

Description

technical field [0001] The present disclosure relates to a microgrid connecting at least one distributed generator and having first and second points of common coupling (PCCs) to an alternating current (AC) power grid. Background technique [0002] A microgrid is a normally operating localized grouping of generation, energy storage and loads connected to a traditional centralized grid (macrogrid) via a point of common coupling (PCC). A single point of common coupling to the macrogrid can be disconnected, islanding the microgrid. Microgrids are part of an architecture for so-called distributed generation (DG), which aims to generate electrical power locally from many small energy sources. [0003] The microgrid (in grid connection mode, ie connected to the macrogrid) supplies the optimal or maximum power output from the point of connection DG, and the rest of the power is supplied by the macrogrid. The microgrid is connected to the macrogrid at the PCC through a controllabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/38H02J3/48H02J3/472Y02P80/14H02J3/381H02J3/388
Inventor R·玛朱姆德
Owner HITACHI ENERGY LTD