CN103986131A - 750 kV line protection system of wind electricity connecting alternating-current/direct-current parallel-serial power grid - Google Patents
750 kV line protection system of wind electricity connecting alternating-current/direct-current parallel-serial power grid Download PDFInfo
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- CN103986131A CN103986131A CN201410187640.8A CN201410187640A CN103986131A CN 103986131 A CN103986131 A CN 103986131A CN 201410187640 A CN201410187640 A CN 201410187640A CN 103986131 A CN103986131 A CN 103986131A
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Abstract
The invention discloses a 750 kV line protection system of a wind electricity connecting alternating-current/direct-current parallel-serial power grid. The system comprises main protection configuration, backup protection configuration and a phase selection element. According to the main protection configuration, optical fiber differential protection and high-frequency longitudinal-connecting direction protection based on full-amount direction or full-amount distance are used, and time domain or frequency domain longitudinal-connecting protection based on model inductive-capacitive judging is used. According to the backup protection configuration, the zero sequence and distance protection based on full amount are used. The phase selection element is based on difference current. The purpose of power grid safe and stable operation under the situation that large-scale wind electricity is connected into the alternating-current/direct-current parallel-serial power grid is achieved.
Description
Technical field
The present invention relates to wind-powered electricity generation field, particularly, relate to a kind of 750kV route protection system of considering large-scale wind power access AC-DC hybrid power grid.
Background technology
At present; the large-scale wind electricity base majority that China's wind-powered electricity generation produces after entering the large-scale development stage is positioned at " three northern areas of China " (northwest, northeast, North China); large-scale wind electricity base is generally away from load center, and its electric power need to be transported to load center and dissolve through long-distance, high voltage.Due to intermittence, randomness and the fluctuation of wind-resources, cause the wind-powered electricity generation in large-scale wind power base to be exerted oneself fluctuation in a big way can occur thereupon, further cause the fluctuation of electric power transmission network trend, bring series of problems to safe operation of electric network.
By in February, 2014, the installed capacity of Gansu Power Grid grid connected wind power has reached 7,020,000 kilowatts, accounts for 21% of Gansu Power Grid total installation of generating capacity, becomes the second largest main force power supply that is only second to thermoelectricity.Along with the improving constantly of wind-electricity integration scale, operation that 750kV ultrahigh-voltage alternating-current is sent circuit outside and Jiuquan-Zhuzhou ± 800kV extra-high voltage direct-current are sent the reply of circuit outside, the new forms of energy development model that ten million multikilowatt wind-powered electricity generation base, Jiuquan is extensive by starting, high concentrates, remote, ultrahigh-voltage alternating-current is combined conveying with extra-high voltage direct-current.Due to the fluctuation of large-scale wind power, in wind power system, introduce a large amount of power electronic device, while making fault, transient process is more complicated, and this makes the fault signature that relaying protection system faces that marked change occur.Hexi Corridor 750kV electrical network is as wind-powered electricity generation Transmission Corridor; except power supply has fluctuation feature; due to will adopt ± 800kV extra-high voltage direct-current transmission technology; it also has the feature of AC-DC hybrid power grid; the power electronic equipment that extra-high voltage direct-current transmission is introduced makes power network electricity transmission line fault transient process more complicated; duration is longer, and harmonic content is abundant, will relaying protection be brought to the impact of can not ignore.Therefore need the AC-DC hybrid power grid relaying protection problem of large-scale wind power access to analyse in depth research, especially need the protection allocation plan of the transmission line of studying each electric pressure, ensure power network safety operation.
Summary of the invention
750kV electrical network is as the passage of sending in ten million multikilowatt wind-powered electricity generation base, Gansu; except power supply has stochastic behaviour; due to will with ± 800kV extra high voltage direct current transmission line paired running; it also has the feature of AC-DC hybrid power grid; add and have interconnecting ties characteristic (Gansu and Xinjiang Power), therefore the protection of 750kV transmission line configuration should consider.When the electrical network dorsal part system of circuit access is stronger, this end is subject to the impact of wind-powered electricity generation or direct current just less, more close to conventional electrical network, now can adopt the protection allocation plan of conventional transmission line; In the time that the dorsal part system of circuit access electrical network is weak, need to consider the impact on protection of wind-powered electricity generation and direct current.
The object of the invention is to, for the problems referred to above, propose a kind of 750kV route protection system of wind-powered electricity generation alternating current-direct current access serial-parallel power grid, to realize the advantage that ensures power network safety operation.
For achieving the above object, the technical solution used in the present invention is:
A 750kV route protection system for wind-powered electricity generation alternating current-direct current access serial-parallel power grid, described system configuration is as follows:
Main protection configuration: adopt optical fiber differential protective and protect apart from the high frequency pilot direction forming based on full dose direction or full dose, and utilizing optical-fibre channel configuration to hold based on model time domain or the frequency domain pilot protection that perception is differentiated;
Backup protection configuration: adopt zero sequence and the distance protection based on full dose;
Phase selection element: adopt the phase selection element based on differential current.
Further, described backup protection configuration, as longer in transmission line distance, select long linear distance protection, and adjusted into tripping without the time limit, as the nearly backup protection of transmission line.
Further, when as stronger in the dorsal part system of access, phase selection element adopts based on voltage and the phase selection element based on full dose distance.
Further, described phase selection element can not adopt the phase selection element based on order component and Sudden Changing Rate.Technical scheme of the present invention has following beneficial effect:
Technical scheme of the present invention, by the carrying out of 750kV line system reasonably configured, carries out reasonable distribution to the technical scheme in each protection stage, has reached the object that ensures power network safety operation.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the trip protection logic block-diagram described in the embodiment of the present invention;
Fig. 2 is 750kV line tripping logic diagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
A 750kV route protection system for wind-powered electricity generation access AC-DC hybrid power grid, described system configuration is as follows:
Main protection configuration: adopt optical fiber differential protective and protect apart from the high frequency pilot direction forming based on full dose direction or full dose, and utilizing optical-fibre channel configuration to hold based on model time domain or the frequency domain pilot protection that perception is differentiated;
Backup protection configuration: adopt zero sequence and the distance protection based on full dose;
Phase selection element: adopt the phase selection element based on differential current.
Main protection configuration: adopt optical fiber differential protective and protect apart from the high frequency pilot direction forming based on full dose direction or full dose, and utilizing existing optical-fibre channel configuration to hold based on model time domain/frequency domain pilot protection that perception is differentiated;
Backup protection configuration: employing zero sequence and the distance protection based on full dose, consider that transmission line distance is longer, preferably with long linear distance protection, and adjusted into tripping without the time limit, as the nearly backup protection of transmission line;
Phase selection element: select the phase selection element based on differential current, can adopt based on voltage and the phase selection element based on full dose distance when as stronger in the dorsal part system of access, should not adopt the phase selection element based on order component and Sudden Changing Rate.
As depicted in figs. 1 and 2, reclosing: 750kV transmission line should configure reclosing, adopts single-phase tripping operation mode, and single-phase fault is jumped single-phase, overlaps.Any heterogeneous fault is jumped three-phase and is not overlapped; Catastrophe failure is as the hand lock-reclosing lock in the time that faulty line trips that closes or close a floodgate, acceleration protection action, lock-reclosing lock.
Wherein in Fig. 1, the protections of pilot protection and long linear distance are not subject to the impact of distributed capacitance, can be by circuit actual disposition;
In figure, marking * is or the quick distance protection of configuration based on power frequency phasor matrix bundle decomposition algorithm.
Logical symbol in literary composition adopt or door and with door.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a 750kV route protection system for wind-powered electricity generation access AC-DC hybrid power grid, is characterized in that, described system configuration is as follows:
Main protection configuration: adopt optical fiber differential protective and protect apart from the high frequency pilot direction forming based on full dose direction or full dose, and utilizing optical-fibre channel configuration to hold based on model time domain or the frequency domain pilot protection that perception is differentiated;
Backup protection configuration: adopt zero sequence and the distance protection based on full dose;
Phase selection element: adopt the phase selection element based on differential current.
2. the 750kV route protection system of wind-powered electricity generation access AC-DC hybrid power grid according to claim 1, is characterized in that, described backup protection configuration; as longer in transmission line distance; select long linear distance protection, and adjusted into tripping without the time limit, as the nearly backup protection of transmission line.
3. the 750kV route protection system of wind-powered electricity generation access AC-DC hybrid power grid according to claim 1 and 2, is characterized in that, when as stronger in the dorsal part system of access, phase selection element adopts based on voltage and the phase selection element based on full dose distance.
4. the 750kV route protection system of wind-powered electricity generation access AC-DC hybrid power grid according to claim 3, is characterized in that, described phase selection element can not adopt the phase selection element based on order component and Sudden Changing Rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410187640.8A CN103986131B (en) | 2014-05-06 | 2014-05-06 | The 750kV line protection systems of wind power integration AC-DC hybrid power grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410187640.8A CN103986131B (en) | 2014-05-06 | 2014-05-06 | The 750kV line protection systems of wind power integration AC-DC hybrid power grid |
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| Publication Number | Publication Date |
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| CN103986131A true CN103986131A (en) | 2014-08-13 |
| CN103986131B CN103986131B (en) | 2017-05-31 |
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| CN201410187640.8A Expired - Fee Related CN103986131B (en) | 2014-05-06 | 2014-05-06 | The 750kV line protection systems of wind power integration AC-DC hybrid power grid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119270A (en) * | 2015-07-30 | 2015-12-02 | 国家电网公司 | Method of analyzing the influence of mass wind power accessing on directional comparison pilot protection |
| CN108599116A (en) * | 2018-04-13 | 2018-09-28 | 国家电网有限公司 | A kind of DC line protection method suitable for alternating current-direct current mixing power distribution network |
| CN111009886A (en) * | 2019-11-20 | 2020-04-14 | 金诗瑶 | Remote-set power protection method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2175538A2 (en) * | 2000-04-10 | 2010-04-14 | General Electric Company | Improved line current differential protective relaying method and relay for in-zone tapped transformers |
| CN103488873A (en) * | 2013-08-28 | 2014-01-01 | 广东电网公司电力调度控制中心 | Multi-mode hidden-fault risk analysis method of relaying protection system |
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2014
- 2014-05-06 CN CN201410187640.8A patent/CN103986131B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2175538A2 (en) * | 2000-04-10 | 2010-04-14 | General Electric Company | Improved line current differential protective relaying method and relay for in-zone tapped transformers |
| CN103488873A (en) * | 2013-08-28 | 2014-01-01 | 广东电网公司电力调度控制中心 | Multi-mode hidden-fault risk analysis method of relaying protection system |
Non-Patent Citations (1)
| Title |
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| 刘益青: "智能变电站站域后备保护原理及实现技术研究", 《中国博士学位论文全文数据库》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119270A (en) * | 2015-07-30 | 2015-12-02 | 国家电网公司 | Method of analyzing the influence of mass wind power accessing on directional comparison pilot protection |
| CN105119270B (en) * | 2015-07-30 | 2020-02-14 | 国家电网公司 | Analysis method for influence of scale wind power access on longitudinal direction protection |
| CN108599116A (en) * | 2018-04-13 | 2018-09-28 | 国家电网有限公司 | A kind of DC line protection method suitable for alternating current-direct current mixing power distribution network |
| CN111009886A (en) * | 2019-11-20 | 2020-04-14 | 金诗瑶 | Remote-set power protection method and device |
| CN111009886B (en) * | 2019-11-20 | 2022-04-01 | 金诗瑶 | Remote-set power protection method and device |
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| CN103986131B (en) | 2017-05-31 |
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