CN116345415A - Micro-grid system breaker control device and micro-grid system - Google Patents
Micro-grid system breaker control device and micro-grid system Download PDFInfo
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- CN116345415A CN116345415A CN202310097045.4A CN202310097045A CN116345415A CN 116345415 A CN116345415 A CN 116345415A CN 202310097045 A CN202310097045 A CN 202310097045A CN 116345415 A CN116345415 A CN 116345415A
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- circuit breaker
- power supply
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- 238000000034 method Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention provides a micro-grid system circuit breaker control device and a micro-grid system, comprising a driving power supply connected in series to a shunt tripping coil of a first circuit breaker and a first tripping control link, wherein the first tripping control link comprises a first feedback switch and a first power failure feedback switch which are connected in series. According to the micro-grid system circuit breaker control device and the micro-grid system, the shunt tripping coil of the first circuit breaker is connected with the driving power supply according to the fault feedback of the first power supply, so that the tripping protection of the first circuit breaker in the case of the first power supply fault is realized, the shunt tripping coil of the first circuit breaker is isolated from the first power supply and the load, false triggering of the shunt tripping coil of the first circuit breaker caused by nonlinear pulsating load of the load can be effectively avoided, the adaptability of the system to the micro-grid system is improved, and the stability of the micro-grid system is improved.
Description
Technical Field
The invention relates to the technical field of micro-grid systems, in particular to a micro-grid system breaker control device and a micro-grid system.
Background
In the current micro-grid system field, relay protection of a power circuit breaker adopts a voltage-loss coil, and meanwhile, a control power supply of the circuit breaker generally adopts an input power supply of the system.
When the load is nonlinear pulsating load, the transient regulation rate of the power output can change within a certain range, voltage and frequency are fluctuated, and when the transient fluctuation range exceeds the allowable range of the voltage loss coil, the power station output circuit breaker or the shunt output circuit breaker is tripped, and the system cannot work normally.
Disclosure of Invention
Based on the above, the invention aims to provide a micro-grid system breaker control device and a micro-grid system, so that the influence factors of system false triggering tripping are reduced, and the stability of the micro-grid system is improved.
In one aspect, the present invention provides a micro-grid system circuit breaker control apparatus, the micro-grid system including a first circuit breaker for connecting a load and a first power source, the micro-grid system circuit breaker control apparatus comprising:
a driving power supply;
a first trip control link connected between the shunt trip coil of the first circuit breaker and the driving power supply, wherein,
the first tripping control link comprises a first feedback switch and a first power failure feedback switch which are connected in series;
the closing and opening states of the first feedback switch are consistent with those of the first circuit breaker;
the first power failure feedback switch is in a closed state when the first power fails.
Optionally, the method further comprises:
a second trip control link connected between the shunt trip coil of the second circuit breaker and the driving power source, wherein,
the second tripping control link comprises a second feedback switch and a second power failure feedback switch which are connected in series;
the closing and opening states of the second feedback switch are consistent with those of the second circuit breaker;
the second power failure feedback switch is in a closed state when the second power fails;
the second circuit breaker is used for connecting the second power supply and the load.
Optionally, the method further comprises:
the third feedback switch is connected with the first power failure feedback switch in parallel, and the closing and opening states of the third feedback switch are consistent with those of the second circuit breaker;
and the fourth feedback switch is connected with the second power failure feedback switch in parallel, and the closing and opening states of the fourth feedback switch are consistent with those of the first circuit breaker.
Optionally, the method further comprises:
the first switching-on switch is connected with the driving power supply in series and is used for driving the first circuit breaker to communicate the first power supply with the load when the first switching-on switch is closed;
a first opening switch and a first opening relay connected in series with the driving power supply, wherein when the first opening switch is closed, the first opening relay drives the first breaker to disconnect the first power supply from the load;
the second switching-on switch is connected with the driving power supply in series and is used for driving the second circuit breaker to communicate the second power supply with the load when the second switching-on switch is closed;
and the second breaking switch drives the second breaker to disconnect the second power supply from the load when the second breaking switch is closed.
Optionally, the first closing relay and the first opening relay further control closing and opening states of the first feedback switch and the fourth feedback switch;
the second closing relay and the second opening relay also control closing and opening states of the second feedback switch and the third feedback switch.
Optionally, the first power source and the second power source are a mains power source and a mobile station power source.
According to another aspect of the invention, a micro-grid system is provided, which comprises the micro-grid system breaker control device provided by the invention.
The micro-grid system circuit breaker control device is provided with a first tripping control link which is connected with a shunt tripping coil of a first circuit breaker and a driving power supply, the first tripping control link is connected with a first feedback switch and a first power supply fault feedback switch in series, the closing and opening states of the first feedback switch are consistent with those of the first circuit breaker, when the first circuit breaker is closed, the shunt tripping coil of the first circuit breaker is connected with the driving power supply when the first power supply fault feedback switch is closed due to the first power supply fault, and the first circuit breaker trips, so that power supply fault protection is realized. The driving power supply of the shunt tripping coil is separated from the first power supply, transient fluctuation can occur in the output of the power supply caused by nonlinear pulse load of the micro-grid system, the tripping protection of the circuit breaker is prevented from being triggered by the transient fluctuation, and therefore the running stability of the micro-grid system can be improved, and the practicability is improved.
The micro-grid system provided by the invention comprises the micro-grid system breaker control device, transient fluctuation can be generated in the output of the micro-grid system due to nonlinear pulse load of the load, the trip protection of the breaker is prevented from being triggered by the transient fluctuation, and the running stability and the practicability of the micro-grid system can be improved.
Drawings
Fig. 1 is a schematic view of a part of a micro grid system according to a first embodiment of the present invention;
fig. 2 and 3 are schematic views illustrating a part of a control device for a micro grid system circuit breaker according to a second embodiment of the present invention;
description of main reference numerals:
the invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a schematic diagram of a portion of a micro grid system according to a first embodiment of the invention is shown.
In this embodiment, the micro-grid system controls the connection between the commercial power supply 10 and the load 30 through the first breaker QF01, controls the connection between the mobile power station power supply 20 and the load 30 through the second breaker QF02, and ensures that the load 30 is connected to only one power supply at the same time by interlocking control of the first breaker QF01 and the second breaker QF02, and meanwhile, avoids safety accidents caused by direct communication between the power supplies.
Wherein, the control of the first breaker QF01 and the second breaker QF02 is controlled by the micro-grid system breaker control device provided by the invention.
Referring to fig. 2 and 3, a schematic diagram of a part of a control device for a micro grid system circuit breaker according to a second embodiment of the invention is shown.
In the embodiment, the switching-on of the first breaker QF01 is controlled by a first switching-on relay KA01, and the switching-off is controlled by a first switching-off relay KA 02; the closing of the second breaker QF02 is controlled by a second closing relay KA03, and the opening is controlled by a second opening relay KA 04.
The first switching-on relay KA01 is connected in series with the first switching-on switch SA01-L and the driving power supply, and when the first switching-on switch SA01-L is closed, the first switching-on relay KA01 switches on a switching-on control power supply path of the first circuit breaker QF01, and the first circuit breaker QF01 switches on and switches on a live wire and a zero wire of the commercial power supply 10 and the load 30.
The first opening relay KA02 is connected in series with the first opening switch SA01-R and the driving power supply, and when the first opening switch SA01-R is closed, the first opening relay KA02 turns on the opening control power supply path of the first breaker QF01, the first breaker QF01 opens, and the live wire and the neutral wire of the commercial power supply 10 and the load 30 are disconnected.
In the present embodiment, the closing control power source and the opening control power source of the first circuit breaker QF01 are the commercial power source 10.
The second switching-on relay KA03 is connected with the second switching-on switch SA02-L in series with the driving power supply, when the second switching-on switch SA02-L is closed, the second switching-on relay KA03 is connected with a switching-on control power supply path of the second circuit breaker QF02, and the second circuit breaker QF02 is switched on to connect with a live wire and a zero wire of the mobile unit power supply 20 and the load 30.
The second switching relay KA04 is connected in series with the second switching switch SA02-R and the driving power supply, and when the second switching switch SA02-R is closed, the second switching relay KA04 turns on a switching control power supply path of the second circuit breaker QF02, the second circuit breaker QF02 switches off, and the live wire and the zero wire of the mobile unit power supply 20 and the load 30 are disconnected.
In the present embodiment, the closing control power source and the opening control power source of the second circuit breaker QF02 are the mobile unit power source 20.
The first switch SA01-L, the first switch SA01-R, the second switch SA02-L and the second switch SA02-R are, for example, switches such as a knob switch, a push button switch, a knob sub-switch and the like, so as to be safely operated.
The first shunt tripping coil QF01-SHT (shunt tripping coil OF the first breaker QF01 for trip control OF the first breaker), the first feedback switch QF01-OF1 and the first power failure feedback switch KA05 are connected in series with the driving power supply, the closing and opening states OF the first feedback switch QF01-OF1 are consistent with the closing and opening states OF the first breaker QF01, the first power failure feedback switch KA05 is in a closed state when the mains supply 10 fails, and the faults OF the mains supply 10 include overvoltage, overcurrent and other fault states.
The second shunt tripping coil QF02-SHT (shunt tripping coil OF the second breaker QF02, for trip control OF the second breaker), the second feedback switch QF02-OF1, and the second power failure feedback switch KA06 are connected in series with the driving power supply, the closing and opening states OF the second feedback switch QF02-OF1 are consistent with the closing and opening states OF the second breaker QF02, the second power failure feedback switch KA06 is in a closed state when the mobile unit power supply 20 fails, and the faults OF the mobile unit power supply 20 include fault states such as overvoltage and overcurrent.
The third feedback switch QF02-OF2 is connected with the first power failure feedback switch KA05 in parallel, and the closing and opening states OF the third feedback switch QF02-OF2 are consistent with those OF the second circuit breaker QF 02; the fourth feedback switch QF01-OF2 is connected with the second power failure feedback switch KA06 in parallel, and the closing and opening states OF the fourth feedback switch QF01-OF2 are consistent with those OF the first circuit breaker QF 01.
The switching-on control OF the first feedback switch QF01-OF1 and the fourth feedback switch QF01-OF2 can be driven by a first switching-on relay KA01, and the switching-off control can be driven by a first switching-off relay KA 02; the second feedback switch QF02-OF1 and the third feedback switch QF02-OF2 can be driven by a second closing relay KA03, and the opening control can be driven by a second opening relay KA 04.
When the first circuit breaker QF01 is in a closing state, the first feedback switch QF01-OF1 is closed, at the moment, if the mains supply 10 fails, the first power failure feedback switch KA05 is closed, the first shunt tripping coil QF01-SHT is connected with the driving power supply, and the first circuit breaker QF01 trips to realize the mains supply failure protection; if the second breaker QF02 is closed at the moment, the third feedback switch QF02-OF2 is closed, the first shunt tripping coil QF01-SHT is also connected with the driving power supply, the first breaker QF01 trips, the interlocking control OF the first breaker QF01 and the second breaker QF02 is realized, the situation that the mains supply 10 and the mobile unit power supply 20 are simultaneously connected with the input end OF the load 30 is avoided, and the direct connection OF the mains supply 10 and the mobile unit power supply 20 is avoided.
When the second breaker QF02 is in a closing state, the second feedback switch QF02-OF1 is closed, at the moment, if the mobile unit power supply 20 fails, the second power failure feedback switch KA06 is closed, the second shunt tripping coil QF02-SHT is connected with the driving power supply, the second breaker QF02 trips, and the mobile unit power failure protection is realized; if the first breaker QF01 is closed at the moment, the fourth feedback switch QF01-OF2 is closed, the second shunt tripping coil QF02-SHT is also connected with the driving power supply, the second breaker QF01 trips, the interlocking control OF the first breaker QF01 and the second breaker QF02 is realized, the situation that the mains supply 10 and the mobile unit power supply 20 are simultaneously connected with the input end OF the load 30 is avoided, and the direct connection OF the mains supply 10 and the mobile unit power supply 20 is avoided.
In this embodiment, the driving power source is a 24V dc power source, and the driving power source corresponding to the operation area is a safe voltage, so as to improve the use security of the system.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A micro grid system circuit breaker control apparatus including a first circuit breaker for connecting a load and a first power source, the micro grid system circuit breaker control apparatus comprising:
a driving power supply;
a first trip control link connected between the shunt trip coil of the first circuit breaker and the driving power supply, wherein,
the first tripping control link comprises a first feedback switch and a first power failure feedback switch which are connected in series;
the closing and opening states of the first feedback switch are consistent with those of the first circuit breaker;
the first power failure feedback switch is in a closed state when the first power fails.
2. The micro grid system circuit breaker control apparatus of claim 1, further comprising:
a second trip control link connected between the shunt trip coil of the second circuit breaker and the driving power source, wherein,
the second tripping control link comprises a second feedback switch and a second power failure feedback switch which are connected in series;
the closing and opening states of the second feedback switch are consistent with those of the second circuit breaker;
the second power failure feedback switch is in a closed state when the second power fails;
the second circuit breaker is used for connecting the second power supply and the load.
3. The micro grid system circuit breaker control apparatus of claim 2, further comprising:
the third feedback switch is connected with the first power failure feedback switch in parallel, and the closing and opening states of the third feedback switch are consistent with those of the second circuit breaker;
and the fourth feedback switch is connected with the second power failure feedback switch in parallel, and the closing and opening states of the fourth feedback switch are consistent with those of the first circuit breaker.
4. The micro grid system circuit breaker control apparatus of claim 3, further comprising:
the first switching-on switch is connected with the driving power supply in series and is used for driving the first circuit breaker to communicate the first power supply with the load when the first switching-on switch is closed;
a first opening switch and a first opening relay connected in series with the driving power supply, wherein when the first opening switch is closed, the first opening relay drives the first breaker to disconnect the first power supply from the load;
the second switching-on switch is connected with the driving power supply in series and is used for driving the second circuit breaker to communicate the second power supply with the load when the second switching-on switch is closed;
and the second breaking switch drives the second breaker to disconnect the second power supply from the load when the second breaking switch is closed.
5. The micro grid system circuit breaker control apparatus as set forth in claim 4 wherein,
the first closing relay and the first opening relay also control closing and opening states of the first feedback switch and the fourth feedback switch;
the second closing relay and the second opening relay also control closing and opening states of the second feedback switch and the third feedback switch.
6. The micro grid system circuit breaker control apparatus according to claim 2, wherein,
the first power supply and the second power supply comprise a mains supply and a mobile power station power supply.
7. A micro grid system comprising a micro grid system circuit breaker control apparatus according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310097045.4A CN116345415A (en) | 2023-02-10 | 2023-02-10 | Micro-grid system breaker control device and micro-grid system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310097045.4A CN116345415A (en) | 2023-02-10 | 2023-02-10 | Micro-grid system breaker control device and micro-grid system |
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| CN116345415A true CN116345415A (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310097045.4A Pending CN116345415A (en) | 2023-02-10 | 2023-02-10 | Micro-grid system breaker control device and micro-grid system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116824512A (en) * | 2023-08-28 | 2023-09-29 | 西华大学 | 27.5kV visual grounding disconnecting link state identification method and device |
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2023
- 2023-02-10 CN CN202310097045.4A patent/CN116345415A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116824512A (en) * | 2023-08-28 | 2023-09-29 | 西华大学 | 27.5kV visual grounding disconnecting link state identification method and device |
| CN116824512B (en) * | 2023-08-28 | 2023-11-07 | 西华大学 | 27.5kV visual grounding disconnecting link state identification method and device |
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