Power frequency change-based power grid island black start device and method

A technology of frequency change and black start, applied in circuit devices, electrical components, AC network circuits, etc., can solve problems such as lack of water and power resources, large investment, etc., to reduce economic losses and social impacts, reduce economic costs, and electricity demand Extended effect

Inactive Publication Date: 2018-09-28
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For modern urban power grids, the general hydropower resources are relatively scarce, and the choice of self-starting gas turbines as the black start source requires a large investment

Method used

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  • Power frequency change-based power grid island black start device and method
  • Power frequency change-based power grid island black start device and method
  • Power frequency change-based power grid island black start device and method

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Embodiment Construction

[0028] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0029] In order to illustrate the technical solution of the present invention, the following will be described through specific embodiments in conjunction with the accompanying drawings.

[0030] The embodiment of the present invention provides a power grid island black start device based on power frequency changes, which is applied to the rapid recovery of power supply in the power grid system. C...

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Abstract

The invention discloses a power frequency change-based power grid island black start device and method. The power grid island black start device comprises a connecting line, a collecting unit and a protecting device, wherein the connecting line is provided with a control switch and is used for connecting a small unit system and an infinite equivalent system, the collecting unit is connected with the connecting line and is used for measuring frequencies at two sides of the connecting line and transmitting measurement values to the protecting device, and the protecting device is used for disconnecting the control switch when the frequency and the rate of change of the frequency meet an action criteria of the protecting device so as to enable the small unit system and the infinite equivalentsystem to uncouple and run with plant power to prepare for starting a main power plant. The method is a start method using the power grid island black start device. The power grid island black start device has the characteristic of rapid start, the investment cost for the black start device is reduced, the power grid recovery time is shortened greatly, and economic loss and social influence are lowered.

Description

technical field [0001] The invention relates to the technical field of power grid black start, in particular to a power grid island black start device and method based on power frequency changes. Background technique [0002] In recent years, with the continuous increase of the scale and capacity of power grids in various regions, the connection between systems has become increasingly frequent, and the safe and stable operation of the power system has been subjected to a huge test. Although the grid structure and safety and stability of large cities have been greatly improved compared to the past, serious failures may still trigger a chain reaction of the system, eventually leading to large-scale power outages. Major accidents such as the blackout in the United States and Canada in August 2003 sounded the alarm to electric power workers, making people fully aware of the diversity and unpredictability of the causes of blackouts. Once an accident occurs, adopting a suitable a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/388
Inventor 何晓峰
Owner SHENZHEN POWER SUPPLY BUREAU
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