CN105529737A - Power network splitting device and method - Google Patents
Power network splitting device and method Download PDFInfo
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- CN105529737A CN105529737A CN201511004942.8A CN201511004942A CN105529737A CN 105529737 A CN105529737 A CN 105529737A CN 201511004942 A CN201511004942 A CN 201511004942A CN 105529737 A CN105529737 A CN 105529737A
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- frequency
- voltage
- parameter
- threshold value
- grid disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a power network splitting device, which is used for being electrically connected between a power network and a power generation end, and comprises a power network parameter sensing unit and a controller, wherein the power network parameter sensing unit is used for sensing a voltage parameter and a frequency parameter of the power network; and the controller is used for judging whether an isolated network is generated or not according to the voltage parameter and the frequency parameter sensed by the power network parameter sensing unit, and splitting the power generation end and the power network after the isolated network is generated. The invention further provides a power network splitting method. According to the power network splitting device and method, a power generation end unit can be quickly split through sensing the voltage and the frequency of the power network when the power network is in a poor condition.
Description
Technical field
The present invention relates to technical field of power generation, particularly relate to a kind of grid disconnection device and method.
Background technology
In electric power system, a large amount of medium and small-scale water and electricity factory by 10kV circuit access electrical network, is all in this collectively small power supply.Small power supply due to installed capacity little; Equipments Setting is mostly simpler; 10kV only has side disconnecting link to be connected with system; without configuration circuit breaker; relay protection scheme aspect only has overvoltage protection, after online line tripping, if there is higher working voltage when isolated power grid; then disconnect generator 380V side switch, the off-the-line as unit is protected.In the area that small power supply is concentrated, power station all adopts T to be connected on the access way of 10kV circuit mostly, with power load conllinear.During the generating of power station, need lifting voltage step by step, sending outside of guarantee electric energy, especially long transmission line, the voltage of line end is higher, and when night, power load was lighter, the phenomenon of user's overtension is more obvious.Based on above reason, the protective circuit be arranged in power station easily causes misoperation, generator power-cutting switch is disconnected, have impact on normal power generation, cause most of power station all that protective circuit is out of service, or protected definite value to be set to very high magnitude of voltage.Therefore be necessary to propose a kind of follow-on IGBT protection circuit to overcome above-mentioned defect.
Summary of the invention
The object of the invention is to, a kind of grid disconnection device is provided, its off-the-line unit reliability is high, action is quick, can not misoperation when system normal operating voltage is higher.
Another object of the present invention is to, a kind of grid disconnection method is provided, its off-the-line unit reliability is high, action is quick, can not misoperation when system normal operating voltage is higher.
To achieve these goals, the invention provides a kind of grid disconnection device, holding with generating for being electrically connected on electrical network, comprising electrical network parameter detecting unit and controller.Described electrical network parameter detecting unit is for detecting voltage parameter and the frequency parameter of described electrical network; Described controller is used for the voltage parameter that detects according to described electrical network parameter detecting unit and frequency parameter judges whether lonely net occurs, and by described generating end and described grid disconnection after orphan nets generation.
Preferably, described controller is provided with the first voltage threshold and first frequency threshold value, described controller is used for when described voltage parameter is greater than described first voltage threshold and described frequency parameter is greater than described first frequency threshold value, by described generating end and described grid disconnection.
Preferably, described controller is also provided with the second voltage threshold and second frequency threshold value, described controller is used for when described voltage parameter is greater than described second voltage threshold and described frequency parameter is greater than described second frequency threshold value, by described generating end and described grid disconnection; Wherein, described first voltage threshold is greater than described second voltage threshold, and described first frequency threshold value is less than described second frequency threshold value.
Preferably, described controller is also provided with tertiary voltage threshold value, and described controller is used for when described voltage parameter is greater than described tertiary voltage threshold value, by described generating end and described grid disconnection; Wherein, described tertiary voltage threshold value is greater than described first voltage threshold.
Preferably, described controller is also provided with the 3rd frequency threshold, and described controller is used for when described frequency parameter is greater than described 3rd frequency threshold, by described generating end and described grid disconnection; Wherein, described 3rd frequency threshold is greater than described second frequency threshold value.
To achieve these goals, the present invention also provides a kind of grid disconnection method, and in electric power networks, described electric power networks comprises electrical network and holds with generating.Described grid disconnection method comprises the following steps: voltage parameter and the frequency parameter of detecting described electrical network; Judge whether lonely net occurs according to the described voltage parameter that detects and frequency parameter, and by described generating end and described grid disconnection after orphan nets generation.
Preferably, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are comprised with the step of described grid disconnection by described generating end after orphan nets generation:
The voltage parameter detected described in judgement whether be greater than the first voltage threshold and described in the frequency parameter that detects whether be greater than first frequency threshold value, and the described voltage parameter detected be greater than described first voltage threshold and described in the frequency parameter that detects be greater than described first frequency threshold value time, by described generating end and described grid disconnection.
Preferably, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
The voltage parameter detected described in judgement whether be greater than the second voltage threshold and described in the frequency parameter that detects whether be greater than second frequency threshold value, and the described voltage parameter detected be greater than described second voltage threshold and described in the frequency parameter that detects be greater than described second frequency threshold value time, by described generating end and described grid disconnection; Wherein, described first voltage threshold is greater than described second voltage threshold, and described first frequency threshold value is less than described second frequency threshold value.
Preferably, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
Whether the voltage parameter detected described in judgement is greater than tertiary voltage threshold value, and when the described voltage parameter detected is greater than described tertiary voltage threshold value, by described generating end and described grid disconnection; Wherein, described tertiary voltage threshold value is greater than described first voltage threshold.
Preferably, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
Whether the frequency parameter detected described in judgement is greater than the 3rd frequency threshold, and when the described frequency parameter detected is greater than described 3rd frequency threshold, by described generating end and described grid disconnection; Wherein, described 3rd frequency threshold is greater than described second frequency threshold value.
Beneficial effect of the present invention: the invention provides a kind of grid disconnection device and method; be configured with overfrequency overvoltage protection, overvoltage protection; overfrequency is protected; reliability, rapidity, sensitivity have been taken into account simultaneously; can when there is multiple unfavorable condition in electrical network; quick off-the-line generating terminal group, can avoid off-the-line protection misoperation simultaneously.
In order to further understand feature of the present invention and technology contents, refer to following detailed description for the present invention and accompanying drawing, but accompanying drawing only provides reference and explanation use, is not used for being limited the present invention.
Accompanying drawing explanation
Fig. 1 is the module map of grid disconnection device in an embodiment of the present invention;
Fig. 2 is the module map of grid disconnection device in another execution mode of the present invention
The flow chart of grid disconnection method in Fig. 3 an embodiment of the present invention.
Embodiment
For further setting forth the technological means and effect thereof that the present invention takes, be described in detail below in conjunction with the preferred embodiments of the present invention and accompanying drawing thereof.
Fig. 1 is the module map of grid disconnection device 100 in an embodiment of the present invention.Grid disconnection device 100 can be used in electric power networks; electric power networks comprises electrical network 200 and generating end 300; generating end 300 can be medium and small-scale water and electricity factory, thermal power plant etc.; generating end 300 is generally by 10kV circuit access electrical network 200; if 10kV line tripping, now grid disconnection device 100 can be used as the off-the-line protection of generating end 300.In the present embodiment, grid disconnection device 100 is electrically connected on electrical network 200 and generating end 300, and grid disconnection device 100 comprises electrical network parameter detecting unit 10 and controller 20.Electrical network parameter detecting unit 10 is for detecting voltage parameter and the frequency parameter of electrical network 200; For the voltage parameter that detects according to electrical network parameter detecting unit 10 and frequency parameter, controller 20 judges whether lonely net occurs, and by generating end 300 and electrical network 200 off-the-line after orphan nets generation.In the present embodiment, lonely net phenomenon refer to when electrical network 200 power break because failure accident or the maintenance and jumping of having a power failure time, generating end 300 fails to detect lonely net state in time, and then fail to cut off electrical network 200 in time, form the lonely net of the self-energizing be made up of generating end 300 and surrounding load, lonely net damages to the personal safety of power equipment or operations staff, and affects power supply quality.Electric power networks by inner grid disconnection device 100 make when detect electrical network 200 break down jump disconnected time, in time by generating end 300 and electrical network 200 off-the-line, thus avoid damaging the personal safety of power equipment or operations staff.
In an embodiment of the present invention, controller 20 is provided with the first voltage threshold and first frequency threshold value, controller 20 be greater than the first voltage threshold for the voltage parameter detected at electrical network parameter detecting unit 10 and frequency parameter is greater than first frequency threshold value time, by generating end 300 and electrical network 200 off-the-line.When electric power networks normally runs, even if overtension, because the frequency of electrical network 200 maintains power frequency 50Hz, grid disconnection device 100 also can not misoperation.When electrical network 200 trips and forms lonely net, voltage and frequency raise simultaneously, grid disconnection device 100 just action, and the setting of simultaneously being compared by this kind of voltage and frequency, improves the reliability of off-the-line protection.
As to further improvement of the present invention, controller 20 is also provided with the second voltage threshold and second frequency threshold value.The voltage parameter of controller 20 also for detecting at electrical network parameter detecting unit 10 be greater than the second voltage threshold and frequency parameter is greater than second frequency threshold value time, by generating end 300 and electrical network 200 off-the-line.Wherein, the first voltage threshold is greater than the second voltage threshold, and first frequency threshold value is less than second frequency threshold value.Electric power networks is by arranging two-part overfrequency overvoltage protection; one of them its voltage threshold of overfrequency overvoltage protection is higher, frequency threshold is lower; focus on off-the-line rapidity, another its voltage threshold of overfrequency overvoltage protection is lower, frequency threshold is higher, focuses on off-the-line sensitivity.
As to further improvement of the present invention, controller 20 is also provided with tertiary voltage threshold value, when the voltage parameter of controller 20 also for detecting at electrical network parameter detecting unit 10 is greater than tertiary voltage threshold value, by generating end 300 and electrical network 200 off-the-line.Wherein, tertiary voltage threshold value is greater than the first voltage threshold, and tertiary voltage threshold value is also greater than the first voltage threshold.For example; the rotating speed of generating end 300 hydraulic turbine is depended in change due to frequency; when electrical network 200 trips formation isolated power grid; voltage instantaneous rises, but frequency can not be suddenlyd change, and the rising of frequency need through certain time delay; therefore overfrequency overvoltage protection is depended merely on; controller 20 can not disconnect generating end 300 switch over-voltage suppression fast after electrical network 200 trips, and therefore in serious superpotential situation, the electric equipment of user side still likely damages.Controller 20 is by setting ratio first voltage threshold and all high tertiary voltage threshold value of the second voltage threshold, thus ustomer premises access equipment can escape the too high high voltage that electric power networks normally runs appearance, when orphan nets the serious overvoltage of appearance, although now frequency parameter does not exceed predetermined threshold value, grid disconnection device 100 equally can fast by generating end 300 and electrical network 200 off-the-line.
As to further improvement of the present invention, controller 20 is also provided with the 3rd frequency threshold, when the frequency parameter of controller 20 also for detecting at electrical network parameter detecting unit 10 is greater than the 3rd frequency threshold, by generating end 300 and electrical network 200 off-the-line.Wherein, the 3rd frequency threshold is greater than second frequency threshold value, and the 3rd frequency threshold is also greater than first frequency threshold value.For example, when electrical network 200 trips formation isolated power grid, under water power exerts oneself the condition balanced with power load, overvoltage can not be produced, although the damage of user side electric equipment now directly can not be caused, but voltage during isolated power grid, frequency constantly fluctuates, power supply quality is lower, also can have impact on the action of circuit checkout voltage reclosing simultaneously, this Time Controller 20 by setting one than first frequency threshold value and all high the 3rd frequency threshold of second frequency threshold value, grid disconnection device 100 equally can fast by generating end 300 and electrical network 200 off-the-line, for reclosing checkout voltage creates conditions, shorten the time that electric power networks restores electricity.
Please refer to Fig. 2, as to further improvement of the present invention, grid disconnection device 100 also comprises man-machine interface 30, can be used for inputting parameter information and the control command of required setting.In other execution modes of invention, man-machine interface 30 can also be used to the running status showing electric power networks in real time.
Further, in order to meet the convenience that grid disconnection device 100 is installed, hardware designs of the present invention can directly be contained in the generator control cabinet of generating end 300, specification is consistent with the meter meter of the cabinet internal standard of existing generator, and design size can be: long × wide × dark=116mm × 120mm × 88mm; Mounting means is installation by adhering, installs bore size can be: length × wide=110mm*110mm, perforate is preferably square hole.
Fig. 3 is the flow chart of grid disconnection method in an embodiment of the present invention.This grid disconnection method can be used in grid disconnection device 100.In the present embodiment, grid disconnection method comprises the following steps: S100, the voltage parameter of detecting electrical network and frequency parameter; According to the voltage parameter detected and frequency parameter, S102, judges whether lonely net occurs, and by generating end and grid disconnection after orphan nets generation.Particularly, voltage parameter and the frequency parameter of electrical network can be detected by electrical network parameter detecting unit 10, can judge whether lonely net occurs by controller 20 according to the voltage parameter detected and frequency parameter simultaneously, and by generating end and grid disconnection after orphan nets generation.
As the further improvement to step S102, controller 20 judges whether the voltage parameter detected is greater than the first voltage threshold and whether the frequency parameter detected is greater than first frequency threshold value, and when the voltage parameter detected is greater than the first voltage threshold and the frequency parameter detected is greater than first frequency threshold value, by generating end and grid disconnection.
As the further improvement to step S102, controller 20 judges whether the voltage parameter detected is greater than the second voltage threshold and whether the frequency parameter detected is greater than second frequency threshold value, and when the voltage parameter detected is greater than the second voltage threshold and the frequency parameter detected is greater than second frequency threshold value, by generating end and grid disconnection.Wherein, the first voltage threshold is greater than the second voltage threshold, and first frequency threshold value is less than second frequency threshold value.
As the further improvement to step S102, controller 20 judges whether the voltage parameter detected is greater than tertiary voltage threshold value, and described to voltage parameter be greater than tertiary voltage threshold value time, by generating end and grid disconnection.Wherein, tertiary voltage threshold value is greater than the first voltage threshold and is greater than the second voltage threshold.
As the further improvement to step S102, controller 20 judges whether the frequency parameter detected is greater than the 3rd frequency threshold, and when the frequency parameter detected is greater than the 3rd frequency threshold, by generating end and grid disconnection.Wherein, the 3rd frequency threshold is greater than first frequency threshold value and is greater than second frequency threshold value.
In sum; grid disconnection device and method provided by the invention; be configured with overfrequency overvoltage protection, overvoltage protection; overfrequency is protected; reliability, rapidity, sensitivity have been taken into account simultaneously; can when there is multiple unfavorable condition in electrical network, quick off-the-line generating terminal group, can avoid off-the-line protection misoperation simultaneously.
The above, for the person of ordinary skill of the art, can make other various corresponding change and distortion according to technical scheme of the present invention and technical conceive, and all these change and be out of shape the protection range that all should belong to the claims in the present invention.
Claims (10)
1. a grid disconnection device, holding with generating for being electrically connected on electrical network, it is characterized in that, comprise:
Electrical network parameter detecting unit, for detecting voltage parameter and the frequency parameter of described electrical network;
For the voltage parameter that detects according to described electrical network parameter detecting unit and frequency parameter, controller, judges whether lonely net occurs, and by described generating end and described grid disconnection after orphan nets generation.
2. grid disconnection device as claimed in claim 1, it is characterized in that, described controller is provided with the first voltage threshold and first frequency threshold value, described controller is used for when described voltage parameter is greater than described first voltage threshold and described frequency parameter is greater than described first frequency threshold value, by described generating end and described grid disconnection.
3. grid disconnection device as claimed in claim 2, it is characterized in that, described controller is also provided with the second voltage threshold and second frequency threshold value, described controller is used for when described voltage parameter is greater than described second voltage threshold and described frequency parameter is greater than described second frequency threshold value, by described generating end and described grid disconnection; Wherein, described first voltage threshold is greater than described second voltage threshold, and described first frequency threshold value is less than described second frequency threshold value.
4. grid disconnection device as claimed in claim 3, it is characterized in that, described controller is also provided with tertiary voltage threshold value, and described controller is used for when described voltage parameter is greater than described tertiary voltage threshold value, by described generating end and described grid disconnection; Wherein, described tertiary voltage threshold value is greater than described first voltage threshold.
5. grid disconnection device as claimed in claim 3, it is characterized in that, described controller is also provided with the 3rd frequency threshold, and described controller is used for when described frequency parameter is greater than described 3rd frequency threshold, by described generating end and described grid disconnection; Wherein, described 3rd frequency threshold is greater than described second frequency threshold value.
6. a grid disconnection method, in electric power networks, described electric power networks comprises electrical network and holds with generating, and it is characterized in that, described grid disconnection method comprises the following steps:
Detect voltage parameter and the frequency parameter of described electrical network;
Judge whether lonely net occurs according to the described voltage parameter that detects and frequency parameter, and by described generating end and described grid disconnection after orphan nets generation.
7. grid disconnection method as claimed in claim 6, it is characterized in that, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are comprised with the step of described grid disconnection by described generating end after orphan nets generation:
The voltage parameter detected described in judgement whether be greater than the first voltage threshold and described in the frequency parameter that detects whether be greater than first frequency threshold value, and the described voltage parameter detected be greater than described first voltage threshold and described in the frequency parameter that detects be greater than described first frequency threshold value time, by described generating end and described grid disconnection.
8. grid disconnection method as claimed in claim 7, it is characterized in that, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
The voltage parameter detected described in judgement whether be greater than the second voltage threshold and described in the frequency parameter that detects whether be greater than second frequency threshold value, and the described voltage parameter detected be greater than described second voltage threshold and described in the frequency parameter that detects be greater than described second frequency threshold value time, by described generating end and described grid disconnection; Wherein, described first voltage threshold is greater than described second voltage threshold, and described first frequency threshold value is less than described second frequency threshold value.
9. grid disconnection method as claimed in claim 8, it is characterized in that, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
Whether the voltage parameter detected described in judgement is greater than tertiary voltage threshold value, and when the described voltage parameter detected is greater than described tertiary voltage threshold value, by described generating end and described grid disconnection; Wherein, described tertiary voltage threshold value is greater than described first voltage threshold.
10. grid disconnection method as claimed in claim 8, it is characterized in that, the voltage parameter detected described in described basis and frequency parameter judge whether lonely net occurs, and are also comprised with the step of described grid disconnection by described generating end after orphan nets generation:
Whether the frequency parameter detected described in judgement is greater than the 3rd frequency threshold, and when the described frequency parameter detected is greater than described 3rd frequency threshold, by described generating end and described grid disconnection; Wherein, described 3rd frequency threshold is greater than described second frequency threshold value.
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| CN110429608A (en) * | 2019-08-19 | 2019-11-08 | 广东电网有限责任公司 | A kind of network system and its disconnection device and Splitting Control |
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