CN108964067B - Method and system for stabilizing power grid - Google Patents
Method and system for stabilizing power grid Download PDFInfo
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- CN108964067B CN108964067B CN201810718546.9A CN201810718546A CN108964067B CN 108964067 B CN108964067 B CN 108964067B CN 201810718546 A CN201810718546 A CN 201810718546A CN 108964067 B CN108964067 B CN 108964067B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02H7/04—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 for transformers
- H02H7/045—Differential protection of transformers
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method and a system for stabilizing a power grid. Wherein, the method comprises the following steps: when a power failure occurs in a high-voltage side transformer substation, the low-cycle load shedding device sends a locking signal to a quick switching device of a low-voltage side distribution room through a communication line; the quick switching device of the low-voltage side distribution room enters a de-enabling state according to a locking signal, wherein the low-voltage side distribution room is connected with a plurality of electric equipment through a selector switch; wherein the low voltage side and the high voltage side are connected by a pair of power feeders, and the communication line is used for transmitting a locking signal. The invention solves the technical problem that the low-voltage side distribution room can not be accurately removed when the cycle of the power grid fault system is broken down in the related technology, and achieves the technical effects of power balance and power grid stabilization.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a system for stabilizing a power grid.
Background
In the related technology, when a system cycle is broken down due to a power grid fault of some large-scale power consumers, a low-cycle load shedding device arranged in a main substation of the power consumers can cut off a feeder line according to the importance of load, so that power generation and power utilization in a plant are in a basic balance state, and stable operation of the power grid is ensured.
For a factory power system with a self-contained power plant, a main substation is generally arranged to be connected with a power grid, a generator set of the self-contained power plant is also connected into the main substation after being boosted, a power supply loop of the factory is led out from the main substation to be stepped down and then supplies power to a subordinate device, the subordinate device is generally provided with a power supply mode that two sections of buses are connected with a bus in a single-bus subsection mode, and the two sections of inlet wires and the bus are connected through a quick-switching device to realize quick switching and mutual standby.
Because the low-frequency load-reducing device is arranged in a power user main transformer substation and is far away from a power distribution room of a subordinate device, if the direct output transmission is carried out by using an outlet contact of the low-frequency load-reducing device, at least the following problems can be caused: the transmission output line of the contact is long, the impedance is increased, and the blocking device has the possibility of refusing action; if a plurality of distribution rooms of the subordinate device need to be laid with cables, the problems of high investment cost and high construction difficulty are caused.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a system for stabilizing a power grid, which at least solve the technical problem that a low-voltage side power distribution room cannot be accurately removed when the cycle of a power grid fault system collapses in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a method of stabilizing a power grid, including: when a power failure occurs in a high-voltage side transformer substation, the low-cycle load shedding device sends a locking signal to a quick switching device of a low-voltage side distribution room through a communication line; the quick switching device of the low-voltage side distribution room enters a de-enabling state according to the locking signal, wherein the low-voltage side distribution room is connected with a plurality of electric equipment through the selector switch; wherein the low voltage side and the high voltage side are connected by a pair of power feeders, the communication lines for transmitting the latching signal.
Further, the transmitting of the locking signal from the low-cycle load shedding device to the fast switching device of the low-voltage side electricity distribution room through the communication line includes: the spare outlet node of the low-cycle load shedding device sends a locking signal to the inlet node of the quick-switching device of the low-voltage side power distribution room through a communication line.
Further, after the fast switching device of the low-voltage side distribution room enters the disable state according to the locking signal, the method further comprises the following steps: the method comprises the steps that a fast switching device of a low-voltage side distribution room collects power parameters of power feeders, when the power parameters determine that a transformer substation on a high-voltage side has power failure, a change-over switch of the fast switching device is kept in an open state, and when the change-over switch is in the open state, at least one of the pair of power feeders is in a power-on state.
Further, the communication line is an optical fiber.
Further, the pair of power feed lines is two power feed lines.
According to another aspect of the embodiments of the present invention, there is also provided a system for stabilizing a power grid, the power grid including: a high-side substation, a low-side distribution room connected to the substation by a pair of power feeders, the substation comprising: the low-cycle load shedding device is used for sending a locking signal to a quick switching device of a low-voltage side distribution room through a communication line when the high-voltage side transformer substation has a power failure; the transformer substation comprises: the quick switching device is connected with the low-cycle load shedding device through the communication line and used for entering a de-enabling state after receiving the locking signal, wherein the low-voltage side power distribution room is connected with a plurality of electric devices through the change-over switch.
Further, the low-cycle load shedding device includes: a main outlet node connected to the low-voltage side distribution room through the power feeder; and the standby exit node is connected with the fast switching device through the communication line and is used for sending the locking signal to the fast switching device.
Further, the quick-cutting device includes: and the entrance node is connected with the standby exit node through the communication line and is used for receiving the locking signal.
Further, the quick-cutting device includes: the acquisition module is used for acquiring the power parameters of the power feeder line on the low-voltage side; and the control module is used for keeping a change-over switch of the quick switching device in an open state when the power parameter determines that the transformer substation on the high-voltage side has a power failure, wherein when the change-over switch is in the open state, at least one of the pair of power feeders is in a power-on state.
Further, the communication line is an optical fiber, and/or the pair of power feeders is two pairs of power feeders.
In the embodiment of the invention, when a power failure occurs in a transformer substation at a high-voltage side, the quick switching device of the distribution room at the low-voltage side enters an enable-off state according to a locking signal, the quick switching device is locked, and the section switching-on is not started, so that partial load is cut off, the technical effects of power utilization balance and power grid stabilization are realized, the technical problem that the distribution room at the low-voltage side cannot be accurately cut off when the cycle of a power grid failure system collapses in the related technology is solved, and meanwhile, the purpose that the load-generating electric equipment cannot be completely lost is ensured, so that the production cannot be completely broken down.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow diagram of a method of stabilizing a power grid according to an embodiment of the invention;
FIG. 2 is a block diagram of a system for stabilizing a power grid in accordance with an embodiment of the present invention;
FIG. 3 is an overall schematic diagram of a power grid of an embodiment of the present invention;
FIG. 4 is a schematic diagram of functional modules of an embodiment of the present invention;
fig. 5 is a schematic diagram of connections between functional modules according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided an embodiment of a method of stabilizing an electrical grid, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer-executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for stabilizing a power grid according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, when a power failure occurs in a high-voltage side transformer substation, the low-cycle load shedding device sends a locking signal to a quick switching device of a low-voltage side distribution room through a communication line;
step S104, enabling a quick switching device of the low-voltage side power distribution room to enter a de-enabled state according to a locking signal, wherein the low-voltage side power distribution room is connected with a plurality of electric equipment through a selector switch; wherein the low voltage side and the high voltage side are connected by a pair of power feeders, said communication lines being for transmitting said locking signal.
Through the steps, when a transformer substation on a high-voltage side has a power failure, the quick switching device of the distribution room on the low-voltage side enters an enable-off state according to a locking signal, the quick switching device is locked, and the sectional switching-on is not started, so that partial load is cut off, the technical effects of power utilization balance and power grid stabilization are achieved, the technical problem that the distribution room on the low-voltage side cannot be accurately cut off when the cycle of a power grid failure system collapses in the related technology is solved, meanwhile, all the electric equipment generating the load is not powered off, and the purpose that the production cannot be completely broken down is ensured.
Optionally, the sending, by the low-cycle load shedding device, the locking signal to the fast switching device of the low-voltage side distribution room through the communication line includes: the spare outlet node of the low-cycle load shedding device sends a locking signal to the inlet node of the quick-switching device of the low-voltage side power distribution room through a communication line.
Optionally, after the fast switching device of the low-voltage side distribution room enters the disable state according to the locking signal, the fast switching device of the low-voltage side distribution room acquires power parameters of the power feeders, and when it is determined that a power failure occurs in the substation on the high-voltage side through the power parameters, the change-over switch of the fast switching device is kept in the open state, wherein when the change-over switch is in the open state, at least one of the pair of power feeders is in the power-on state. Optionally, when the power feeder is two power feeders, one of the two power feeders is in a power-on state, and the other power feeder is in a power-off state.
Optionally, after the fast switching device of the low-voltage side distribution room enters the disable state according to the locking signal, the method further includes: switching the fast switching device to an enabled state for a preset period of time or after the power failure returns to normal.
Alternatively, the communication line may be a medium such as an optical fiber.
According to an embodiment of the present invention, an embodiment of a system for stabilizing a power grid is provided, and fig. 2 is a structural diagram of the system for stabilizing the power grid according to the embodiment of the present invention, as shown in fig. 2, the power grid includes: a high-voltage side substation 20, a low-voltage side electricity distribution room 22 connected to the substation via a pair of power feeders,
the substation 20 includes: the low-cycle load shedding device 202 is used for sending a locking signal to a quick switching device of a low-voltage side distribution room through a communication line when a power failure occurs in a high-voltage side transformer substation;
the electricity distribution room 22 includes: and a quick switching device 222 connected to the low-cycle load shedding device through a communication line, for entering a disabled state after receiving a locking signal, wherein the low-voltage side electricity distribution room is connected to the plurality of electric devices through a transfer switch.
Optionally, the low-cycle load shedding device comprises: the main outlet node is connected with the low-voltage side power distribution room through a power feeder; and the spare exit node is connected with the fast switching device through a communication line and used for sending a locking signal to the fast switching device.
Optionally, the fast-cutting device comprises: and the inlet node is connected with the standby outlet node through a communication line and used for receiving the locking signal.
Optionally, the fast-cutting device comprises: the acquisition module is used for acquiring power parameters of the power feeder line on a low-voltage side; and the control module is used for keeping a change-over switch of the quick switching device in an open state when the power parameter determines that the transformer substation on the high-voltage side has a power failure, wherein when the change-over switch is in the open state, at least one of the pair of power feeders is in a power-on state.
In the system of the present embodiment, the communication line is an optical fiber, and/or the pair of power feeders is two power feeders.
When the low-cycle load shedding device of the power consumer main substation acts, in order to ensure that the production device does not lose power completely, the device can only cut 1 of 2 lines of the main substation feeder line of the same distribution room. When 1 incoming line of the lower-level distribution room loses power, the quick switching device starts the low-voltage side section switch to be switched on, and the power load of the upper-level system is not cut off. Fig. 3 is an overall schematic diagram of a power grid according to an embodiment of the present invention, which includes at least the following functional modules:
the fast switching device is used as a switching criterion of 2 incoming lines and sections according to sampled current, voltage and switching value signals of two sections of buses. When the section 1 is in power-off and no current, the quick switching device cuts off the section and closes the section switch. If an external locking signal is input, the quick switching device is locked to switch the functions. The quick-switching device has a function of locking and withdrawing the switching value input contact signal, so that the outlet contact is led to the locking input contact of the quick-switching device to realize related functions when the low-cycle deloading device acts.
The low-cycle load shedding device of the main transformer substation samples voltage signals of a system, when the voltage and the frequency of the system vibrate, the voltage signals are set according to fixed values, and an outlet tripping node is separated from a feeder switch, so that the purpose of load shedding is achieved. When the low-cycle load shedding device acts, the load feeder is cut off in batches. The total substation is 2 inlet wires of subordinate factory device (being the consumer of low pressure side) power supply, if cut off simultaneously, will cause the whole device to lose the electricity, and production is stopped, if only cut off 1, the fast cutting device starts and closes a floodgate with the segmentation, then the power load of system still has not been alleviated in the factory. Through the scheme of the embodiment, the quick switching device for power supply of the lower-level factory device is locked when the low-cycle load shedding device acts, so that part of unimportant loads can be cut off, the power generation and utilization of power consumers are guaranteed to be in a balanced state as much as possible, the reliable power supply of important loads is guaranteed, the single-section power supply of a power supply system of the switched load device can be guaranteed, and the continuity of power utilization in production is guaranteed.
The optical fiber differential protection device comprises differential protection optical fibers or other communication media, can realize remote transmission of electrical locking between a local power distribution room and a remote power distribution room, adopts optical fiber differential protection for main protection of the transformer, samples a non-electric protection signal of a transformer body by a device at a low-voltage side, and can set tripping outlet contacts by an outlet matrix by the protection devices at two sides when the non-electric protection is started. Fig. 4 is a schematic diagram of functional modules of an embodiment of the present invention. Fig. 5 is a schematic diagram of connections between functional modules according to an embodiment of the present invention.
According to the scheme of the embodiment, the standby tripping outlet contact of the low-frequency load shedding device is set to the standby tripping outlet contact of the high-voltage side optical fiber differential protection device through the standby non-electric quantity input contact of the high-voltage side optical fiber differential protection device, and the tripping outlet contact of the low-voltage side optical fiber differential protection device is led to the locking input contact of the quick-cutting device. When the low-cycle load shedding device acts, the quick-cutting device is locked, so that 1 section of the lower-level production device is electrified, and the other 1 section of the load is thrown away to ensure the stability of the system.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of stabilizing a power grid, comprising:
when a power failure occurs in a high-voltage side transformer substation, the low-cycle load shedding device sends a locking signal to a quick switching device of a low-voltage side distribution room through a communication line;
the quick switching device of the low-voltage side distribution room enters a de-enabling state according to the locking signal, wherein the low-voltage side distribution room is connected with a plurality of electric equipment through a selector switch;
wherein the low voltage side and the high voltage side are connected by a pair of power feeders, the communication lines for transmitting the latching signals;
and when the power feeder lines are two power feeder lines, one of the two power feeder lines is in a power-on state, and the other power feeder line is in a power-off state.
2. The method of claim 1, wherein sending a lock-up signal from the low cycle load shedding device to the fast-switching device of the low side distribution room via the communication line comprises:
the spare outlet node of the low-cycle load shedding device sends a locking signal to the inlet node of the quick-switching device of the low-voltage side power distribution room through a communication line.
3. The method of claim 1, wherein after the fast switching device of the low side distribution room enters a de-enabled state in accordance with the lockout signal, the method further comprises:
the method comprises the steps that a fast switching device of a low-voltage side distribution room collects power parameters of power feeders, when the power parameters determine that a transformer substation on a high-voltage side has power failure, a change-over switch of the fast switching device is kept in an open state, and when the change-over switch is in the open state, at least one of the pair of power feeders is in a power-on state.
4. A method according to any of claims 1 to 3, wherein the communication line is an optical fibre.
5. The method of any of claims 1 to 3, wherein after the fast switching device of the low side distribution room enters a de-enabled state in accordance with the lockout signal, the method further comprises:
switching the fast switching device to an enabled state for a preset period of time or after the power failure returns to normal.
6. A system for stabilizing an electrical grid, the electrical grid comprising: a high-voltage side substation, a low-voltage side electricity distribution room connected with the substation through a pair of power feeders,
the transformer substation comprises: the low-cycle load shedding device is used for sending a locking signal to a quick switching device of a low-voltage side distribution room through a communication line when the high-voltage side transformer substation has a power failure;
the transformer substation comprises: the quick switching device is connected with the low-cycle load shedding device through the communication line and used for entering a de-enabling state after receiving the locking signal, wherein the low-voltage side power distribution room is connected with a plurality of electric equipment through a selector switch;
and when the power feeder lines are two power feeder lines, one of the two power feeder lines is in a power-on state, and the other power feeder line is in a power-off state.
7. The system of claim 6, wherein the low cycle load shedding device comprises:
a main outlet node connected to the low-voltage side distribution room through the power feeder;
and the standby exit node is connected with the fast switching device through the communication line and is used for sending the locking signal to the fast switching device.
8. The system of claim 7, wherein the fast switching means comprises:
and the entrance node is connected with the standby exit node through the communication line and is used for receiving the locking signal.
9. The system of claim 6, wherein the fast switching device comprises:
the acquisition module is used for acquiring the power parameters of the power feeder line on the low-voltage side;
and the control module is used for keeping a change-over switch of the quick switching device in an open state when the power parameter determines that the transformer substation on the high-voltage side has a power failure, wherein when the change-over switch is in the open state, at least one of the pair of power feeders is in a power-on state.
10. The system of any one of claims 6 to 9, wherein the communication line is an optical fiber.
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| CN208297606U (en) * | 2018-04-27 | 2018-12-28 | 四川省盛源鑫智能电气有限责任公司 | A kind of switchgear with wireless monitoring function |
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2018
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| CN105406464A (en) * | 2015-11-20 | 2016-03-16 | 国家电网公司 | Stability control method for faults of ultra-high voltage grid |
| CN105977923A (en) * | 2016-05-09 | 2016-09-28 | 国网山东省电力公司 | Relay protection device and system, realizing plug-and-play, of transformer station |
| CN106356863A (en) * | 2016-09-06 | 2017-01-25 | 许昌许继软件技术有限公司 | Under-frequency load shedding system and under-frequency load shedding method on basis of panoramic information of regional power grids |
| CN208297606U (en) * | 2018-04-27 | 2018-12-28 | 四川省盛源鑫智能电气有限责任公司 | A kind of switchgear with wireless monitoring function |
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