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330kv circuit protection system for integration of wind power to ac-DC hybrid power grid

An AC/DC hybrid and line protection technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as long duration, changes in fault characteristics, and complex transient process of faults in power grid transmission lines.

Inactive Publication Date: 2014-08-20
STATE GRID CORP OF CHINA +3
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Problems solved by technology

Due to the volatility of large-scale wind power, a large number of power electronic devices are introduced into the wind power system, which makes the transient process more complicated during faults, which makes the fault characteristics faced by the relay protection system change significantly.
The 750kV power grid in Gansu Hexi is used as a wind power transmission channel. In addition to the fluctuation characteristics of the power supply, it also has the characteristics of an AC-DC hybrid grid due to the use of ±800kV UHV DC transmission technology. The power electronic device introduced by UHV DC transmission makes The transient process of grid transmission line faults is more complex, lasts longer, and has rich harmonic content, which will have a non-negligible impact on relay protection

Method used

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  • 330kv circuit protection system for integration of wind power to ac-DC hybrid power grid
  • 330kv circuit protection system for integration of wind power to ac-DC hybrid power grid

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Embodiment Construction

[0021] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0022] A 330kV line protection system for connecting wind power to the AC / DC hybrid power grid. The system configuration is as follows:

[0023] Main protection configuration: adopt fiber channel, adopt two sets of optical fiber differential protection, and use fiber channel to configure time domain or frequency domain longitudinal protection based on model capacity and inductance judgment, fiber channel is the only one;

[0024] Backup protection configuration: using distance protection based on power frequency;

[0025] Phase selection element: use a phase selection element based on differential current;

[0026] Directional elements: Power directional elements w...

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Abstract

The invention discloses a 330kV circuit protection system for integration of wind power to an AC-DC hybrid power grid. The system is configured as follows: main protection configuration: an optical-fiber channel is adopted and two sets of optical-fiber differential protections of different principles are configured and the prior optical-fiber channel is used to configure time-domain or frequency-domain pilot protection based model capacitive and inductive performance judgment; backup protection configuration: distance protection based on power frequency is adopted; a phase selection element: a phase selection element based on differential current is adopted; and a direction element: a 90-degree-wiring power direction element is adopted. An objective of ensuring safe and stable operation of the power grid under a condition that large-scale wind power is integrated to the AC-DC hybrid power grid.

Description

technical field [0001] The invention relates to the field of wind power, in particular to a 330kV line protection system considering the connection of large-scale wind power to an AC / DC hybrid power grid. Background technique [0002] At present, most of the large-scale wind power bases generated after my country's wind power enters the stage of large-scale development are located in the "three north regions" (Northwest, Northeast, and North China). Large-scale wind power bases are generally far away from the load center, and their power needs to be transmitted to load center for consumption. Due to the intermittency, randomness and volatility of wind resources, the wind power output of large-scale wind power bases will fluctuate in a large range, which will further lead to fluctuations in the power flow of the transmission network and bring a series of problems to the safety of power grid operation. [0003] As of February 2014, Gansu grid-connected wind power installed cap...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 何世恩路亮汪宁渤宋国兵丁坤李津周识远
Owner STATE GRID CORP OF CHINA
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