CN112993947A - Network type frequency voltage emergency control method, device and system - Google Patents
Network type frequency voltage emergency control method, device and system Download PDFInfo
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- CN112993947A CN112993947A CN202110161509.4A CN202110161509A CN112993947A CN 112993947 A CN112993947 A CN 112993947A CN 202110161509 A CN202110161509 A CN 202110161509A CN 112993947 A CN112993947 A CN 112993947A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000002159 abnormal effect Effects 0.000 claims abstract description 21
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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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- 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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a network type frequency voltage emergency control method, a device and a system, wherein a main transformer station detects whether the frequency of a bus voltage is abnormal; if the abnormal condition exists, the load shedding operation is carried out on the main transformer station, and meanwhile, a load shedding command is sent to the target sub-transformer station through the network; and the target sub-substation controls the action of the outgoing trip circuit according to the load reduction command. According to the invention, one transformer is selected as a main transformer station, other transformer stations are sub-transformer stations, load reduction equipment is only installed on the main transformer station, the voltage frequency of the whole network is detected on the main transformer station, when the voltage frequency is detected to be abnormal, the main transformer station sends a load reduction instruction to the sub-transformer stations, and the sub-transformer stations can control the tripping loop to act according to the load reduction instruction, so that the load reduction equipment does not need to be additionally arranged on each transformer station, and the workload, the investment cost and the maintenance cost are reduced.
Description
Technical Field
The invention relates to the field of emergency control of frequency and voltage of transformers, in particular to a network type emergency control method, device and system of frequency and voltage.
Background
The frequency-voltage emergency control system must avoid all primary and secondary users, resulting in insufficient load shedding in part of regions. Aiming at the problem, the current method is to newly add a load reduction device at each transformer substation, but the newly added load reduction device needs to store technical improvement projects and is connected into each outlet trip circuit by combining a power failure plan, the period is long, the device is difficult to regularly check, and the operation and maintenance are not in place.
Disclosure of Invention
In order to solve the above problems, the present invention provides a network type frequency voltage emergency control method, device and system.
The technical scheme of the invention is as follows: a network type frequency voltage emergency control method comprises the following steps:
the main transformer station detects whether the frequency of the bus voltage is abnormal;
if the abnormal condition exists, the load shedding operation is carried out on the main transformer station, and meanwhile, a load shedding command is sent to the target sub-transformer station through the network;
and the target sub-substation controls the action of the outgoing trip circuit according to the load reduction command.
Further, the method comprises the following steps:
when the main transformer station detects that the frequency of the bus voltage is abnormal, calculating the required total load shedding amount;
obtaining the amount of the load which can be cut off per se;
subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
obtaining the switchable load capacity of each sub-substation;
and determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
And further determining a target sub-substation according to the residual load shedding amount and the load shedding amount of each sub-substation and based on the load shedding priority of each sub-substation.
The technical scheme of the invention also comprises a network type frequency and voltage emergency control device which is arranged at the end of the main transformer substation and comprises,
an abnormal signal receiving module: receiving a bus voltage frequency abnormal signal;
the self load shedding execution module: carrying out load shedding operation on the main transformer station;
an offloading command sending module: and sending a load shedding command to the target sub-substation through the network.
Further, still include:
the total load shedding amount calculation module: calculating the required total load shedding amount;
a first load acquisition module: obtaining the switchable load capacity of the main power station;
the residual load shedding amount calculation module: subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
the second load shedding amount acquisition module: obtaining the switchable load capacity of each sub-substation;
the target sub-substation determination module: and determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
Further, the target sub-substation determining module determines the target sub-substation according to the remaining load shedding amount and the load shedding amount of each sub-substation and based on the load shedding priority of each sub-substation.
The technical scheme of the invention also comprises a network type frequency and voltage emergency control system, which comprises a main transformer station and a plurality of sub-transformer stations;
the main transformer station is provided with load reduction equipment and a main controller, and the load reduction equipment is electrically connected with the main controller; the main controller is provided with the device of any one of the above items;
each sub-substation is provided with a sub-controller, each outgoing line tripping loop in the sub-substation is provided with a tripping switch, and the tripping switch is electrically connected with the corresponding sub-controller;
the main controller communicates with each sub-controller through a network.
According to the network type frequency voltage emergency control method, device and system, one transformer is selected as a main transformer station, other transformer stations are sub transformer stations, load reduction equipment is only installed on the main transformer station, the voltage frequency of the whole network is detected in the main transformer station, when the voltage frequency is detected to be abnormal, the main transformer station sends a load reduction instruction to the sub transformer stations, the sub transformer stations can control tripping loop action to occur according to the load reduction instruction, load reduction equipment does not need to be additionally arranged in each transformer station, and the workload, the input cost and the maintenance cost are reduced.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a block diagram illustrating a second embodiment of the present invention;
fig. 3 is a schematic block diagram of three structures according to the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
Example one
As shown in fig. 1, the present embodiment provides a network type frequency-voltage emergency control method, which includes the following steps:
s1, detecting whether the bus voltage frequency is abnormal by the main substation;
s2, if the abnormal condition exists, the load shedding operation is carried out on the main transformer substation, and meanwhile, a load shedding command is sent to the target sub-transformer substation through the network;
and S3, controlling the action of the outgoing trip circuit by the target sub-substation according to the load shedding command.
The method selects one transformer substation as a main transformer substation, other transformer substations as sub-transformer substations, the main transformer substation detects the voltage frequency state of the whole network, and when the voltage frequency of the whole network is abnormal, the main transformer substation sends instructions to other sub-transformer substations through the network so as to control the sub-transformer substations to act. And each sub-substation does not need to be additionally provided with load reduction equipment, so that the investment cost and the maintenance cost are reduced.
The method comprises the following steps of determining a sub-substation needing to execute load shedding action:
step one, when a main transformer station detects that the frequency of bus voltage is abnormal, calculating the required total load shedding amount;
step two, obtaining the load cutting capacity per se;
subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
step four, obtaining the switchable load capacity of each sub-substation;
and step five, determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
In addition, in the fifth step, the target sub-substation is determined according to the remaining load shedding amount and the load shedding amount of each sub-substation and also based on the load shedding priority of each sub-substation. The method comprises the steps of firstly selecting the sub-transformer substation with the lowest priority to judge the load shedding amount, if the load shedding amount of the sub-transformer substation cannot meet the requirement of the residual load shedding amount, judging the load shedding amount of the sub-transformer substation with the lowest priority, if the total load shedding amount of the two sub-transformer substations cannot meet the requirement of the residual load shedding amount, further selecting the sub-transformer substation with the lowest priority, and so on until the total load shedding amount of the selected sub-transformer substation meets the residual load shedding amount.
Example two
As shown in fig. 2, on the basis of the first embodiment, the present embodiment provides a network-type frequency-voltage emergency control device, which is configured at a main substation end and executed by the main substation end, and includes the following functional modules.
The abnormal signal receiving module 101: receiving a bus voltage frequency abnormal signal;
the self load shedding execution module 102: carrying out load shedding operation on the main transformer station;
the offloading command sending module 103: and sending a load shedding command to the target sub-substation through the network.
In order to determine the target sub-substation, the following functional modules are also arranged:
the total tangential load calculation module 104: calculating the required total load shedding amount;
the first tangential load amount acquisition module 105: obtaining the switchable load capacity of the main power station;
the remaining tangential load amount calculation module 106: subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
the second load shedding amount obtaining module 107: obtaining the switchable load capacity of each sub-substation;
target sub-substation determination module 108: and determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
The target sub-substation determining module 108 determines the target sub-substation according to the remaining load shedding amount and the load shedding amount of each sub-substation, and based on the load shedding priority of each sub-substation.
EXAMPLE III
As shown in fig. 3, the present embodiment provides a network-type frequency-voltage emergency control system, which includes a main substation and a plurality of sub-substations.
The main transformer station is provided with load shedding equipment and a main controller, and the load shedding equipment is electrically connected with the main controller. The load shedding equipment can detect the voltage frequency of the bus in real time, transmit detection information to the main controller and receive an instruction of the main controller to execute load shedding operation. The main controller is configured with the device of the second embodiment, and executes the method of the first embodiment after operation, and executes load shedding operation on the whole network when the voltage frequency is abnormal.
Each sub-substation is provided with a sub-controller, each outgoing line tripping loop in the sub-substation is provided with a tripping switch, and the tripping switch is electrically connected with the corresponding sub-controller. The main controller communicates with each sub-controller through a network. And the sub-controller receives a load shedding command of the main controller and controls the action of the trip switches of the trip loops according to the command so as to realize load shedding.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A network type frequency voltage emergency control method is characterized by comprising the following steps:
the main transformer station detects whether the frequency of the bus voltage is abnormal;
if the abnormal condition exists, the load shedding operation is carried out on the main transformer station, and meanwhile, a load shedding command is sent to the target sub-transformer station through the network;
and the target sub-substation controls the action of the outgoing trip circuit according to the load reduction command.
2. The network-based frequency-voltage emergency control method of claim 1, further comprising the steps of:
when the main transformer station detects that the frequency of the bus voltage is abnormal, calculating the required total load shedding amount;
obtaining the amount of the load which can be cut off per se;
subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
obtaining the switchable load capacity of each sub-substation;
and determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
3. The network-based frequency-voltage emergency control method of claim 2, wherein the target sub-substation is determined based on the load shedding priority of each sub-substation while the remaining load shedding amount and the switchable load amount of each sub-substation are determined.
4. A network-type frequency-voltage emergency control device is characterized in that the network-type frequency-voltage emergency control device is arranged at a main transformer station end and comprises,
an abnormal signal receiving module: receiving a bus voltage frequency abnormal signal;
the self load shedding execution module: carrying out load shedding operation on the main transformer station;
an offloading command sending module: and sending a load shedding command to the target sub-substation through the network.
5. The network-based frequency-voltage emergency control device of claim 4, further comprising:
the total load shedding amount calculation module: calculating the required total load shedding amount;
a first load acquisition module: obtaining the switchable load capacity of the main power station;
the residual load shedding amount calculation module: subtracting the self-cuttable load amount from the total cut load amount to obtain the residual cut load amount;
the second load shedding amount acquisition module: obtaining the switchable load capacity of each sub-substation;
the target sub-substation determination module: and determining the target sub-transformer substation according to the residual load shedding amount and the load shedding amount of each sub-transformer substation.
6. The network-type frequency-voltage emergency control device of claim 5, wherein the target sub-substation determining module determines the target sub-substation based on the load shedding priority of each sub-substation while determining the remaining load shedding amount and the switchable load shedding amount of each sub-substation.
7. A network type frequency voltage emergency control system is characterized by comprising a main transformer substation and a plurality of sub-transformer substations;
the main transformer station is provided with load reduction equipment and a main controller, and the load reduction equipment is electrically connected with the main controller; the master controller is provided with the apparatus of any one of claims 4-6;
each sub-substation is provided with a sub-controller, each outgoing line tripping loop in the sub-substation is provided with a tripping switch, and the tripping switch is electrically connected with the corresponding sub-controller;
the main controller communicates with each sub-controller through a network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110161509.4A CN112993947A (en) | 2021-02-05 | 2021-02-05 | Network type frequency voltage emergency control method, device and system |
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| CN202110161509.4A CN112993947A (en) | 2021-02-05 | 2021-02-05 | Network type frequency voltage emergency control method, device and system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868164A (en) * | 2012-09-18 | 2013-01-09 | 安徽省电力公司芜湖供电公司 | Low-frequency voltage load-reducing linkage coordination control method |
| 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 |
| CN107134787A (en) * | 2017-06-23 | 2017-09-05 | 国网江苏省电力公司电力科学研究院 | Urgent accurate cutting load control system and cutting load method based on distributed feeder automation |
| CN112186782A (en) * | 2020-09-30 | 2021-01-05 | 山东大学 | Accurate low-frequency load shedding system and method proportional to frequency offset |
| CN112260285A (en) * | 2020-08-27 | 2021-01-22 | 国电南瑞科技股份有限公司 | Accurate load control system and method for power distribution network |
-
2021
- 2021-02-05 CN CN202110161509.4A patent/CN112993947A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868164A (en) * | 2012-09-18 | 2013-01-09 | 安徽省电力公司芜湖供电公司 | Low-frequency voltage load-reducing linkage coordination control method |
| 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 |
| CN107134787A (en) * | 2017-06-23 | 2017-09-05 | 国网江苏省电力公司电力科学研究院 | Urgent accurate cutting load control system and cutting load method based on distributed feeder automation |
| CN112260285A (en) * | 2020-08-27 | 2021-01-22 | 国电南瑞科技股份有限公司 | Accurate load control system and method for power distribution network |
| CN112186782A (en) * | 2020-09-30 | 2021-01-05 | 山东大学 | Accurate low-frequency load shedding system and method proportional to frequency offset |
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Application publication date: 20210618 |
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