CN110336315B - Isolated network operation control system for local power grid of receiving-end city - Google Patents
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- 238000012806 monitoring device Methods 0.000 claims abstract description 58
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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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- H02J3/386—
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
Abstract
The invention provides a receiving end city local power grid isolated network operation control system, wherein: the networking line monitoring device acquires a voltage signal and a current signal of a receiving-end urban local power grid, judges whether the operating state of the receiving-end urban local power grid and a networking-to-isolated network fault between the receiving-end urban local power grid and a main network occur or not, and sends an isolated network operating state signal to the isolated network operating generator adjusting device and the isolated network operating load shedding device when the receiving-end urban local power grid is in an isolated network operating state; and the isolated network operation load shedding device begins to utilize the frequency and the voltage of the local power grid of the receiving end city according to the isolated network operation state signal, and selects to shed the load of the local power grid of the receiving end city. The system provided by the invention can be used for carrying out fine continuous adjustment after the isolated network is formed by the local power grid of the receiving-end city, the control cost is low, and the problem of over-control or under-control can be avoided.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an isolated network operation control system for a local power grid of a receiving-end city.
Background
With the rapid development of economy in China, power load is continuously increased, the voltage level of a power system is higher and higher, and after the voltage level of a main grid frame of the power grid is increased, the risk that isolated grid independent operation or even large-area power failure is possibly caused by accidental events such as natural disasters, power equipment aging, voltage breakdown, cascading failure and the like of a local power grid with a lower voltage level is caused. In recent years, power failure accidents of a large power grid occur worldwide, and the attention degree of people on safe and reliable operation of the power grid is increased. The occurrence of large-area power failure accidents often causes huge economic loss, and the caused consequences are more and more serious.
In order to keep the safe and stable operation of the large power grid, a safety and stability control system is adopted for control in China, the safe and stable operation of the large power grid under the condition of serious faults is ensured, the safety and stability control system is used for controlling the isolated operation of the local power grid of the receiving end city, fine continuous adjustment cannot be carried out, the control cost is large, and the possibility of over-control or under-control exists.
Disclosure of Invention
In order to solve the technical problems, the invention provides a receiving-end urban local power grid isolated network operation control system which can perform fine continuous adjustment after isolated network is formed in the receiving-end urban local power grid, has low control cost and does not have the problems of over-control or under-control.
The invention provides a receiving end city local power grid isolated network operation control system, which comprises: the system comprises a networking line monitoring device, a single-grid fault generator quick adjusting device, a single-grid fault quick load shedding device, a single-grid operation generator adjusting device and a single-grid operation load shedding device;
the networking line monitoring device is used for acquiring voltage signals and current signals of a local power grid of a receiving end city, judging whether the operation state of the local power grid of the receiving end city and whether networking to isolated network faults occur between the local power grid of the receiving end city and a main grid or not according to the voltage signals and the current signals of the local power grid of the receiving end city, and sending control commands to the isolated network fault generator rapid adjusting device and the isolated network fault rapid load switching device when the networking to isolated network faults occur between the local power grid of the receiving end city and the main grid;
the isolated grid fault generator rapid adjusting device is used for adjusting the output power of a generator in a local power grid of a receiving end city according to the control command;
the isolated network fault rapid load shedding device is used for shedding the load of the local power grid of the receiving end city according to the control command;
the isolated network operation generator adjusting device is used for adjusting the output power of a generator in the receiving end city local power grid by using the frequency and the voltage of the receiving end city local power grid according to the isolated network operation state signal;
and the isolated network operation load cutting device is used for selectively cutting off the load of the local power grid of the receiving end city by using the frequency and the voltage of the local power grid of the receiving end city according to the isolated network operation state signal.
Preferably, the operation control system comprises a plurality of networking line monitoring devices, wherein one networking line monitoring device is a main networking line monitoring device;
each networking line monitoring device is used for acquiring three-phase voltage, three-phase current and switch position signals of a networking line between a substation or a power plant of a local power grid of a receiving end city where the networking line monitoring device is located and a main grid;
the other networking line monitoring devices except the main networking line monitoring device in the plurality of networking line monitoring devices are also used for sending the three-phase voltage, the three-phase current and the switch position signal of the corresponding networking line to the main networking line monitoring device;
the main networking line monitoring device is used for calculating the power of a networking line according to the three-phase voltage, the three-phase current and a switch position signal of the networking line, comparing the three-phase current of the networking line with a set current threshold value, comparing the power of the networking line with the set power threshold value, and judging whether the transformer substation or a switch between the power plant and a main network is in a brake separating state or not according to the switch position signal.
Preferably, the main networking line monitoring device is further configured to send a control command to the isolated network fault generator fast adjustment device to control the isolated network fault generator fast adjustment device to adjust the output power of the generator in the receiving-end urban local power grid when the networking to isolated network fault occurs in the receiving-end urban local power grid, and if a required adjustment amount corresponding to the output power of the generator exceeds an adjustable range of the generator, the main networking line monitoring device also sends a control command to the isolated network fault fast load shedding device to control the isolated network fault fast load shedding device to shed the load of the receiving-end urban local power grid.
Preferably, the main networking line monitoring device is further configured to generate a control command according to the magnitude of power received by the local power grid of the receiving end city from the main network before the fault after all switches on the networking lines between the substation or the power plant of the receiving end city local power grid and the main network are tripped due to the fault, and send the control command to the isolated network fault generator fast adjusting device and the isolated network fault fast load shedding device;
the isolated network fault generator rapid adjusting device is used for adjusting the output power of the generator in the receiving end urban local power grid according to the power received by the corresponding fault front receiving end urban local power grid from the main grid in the control command;
and the isolated network fault rapid load shedding device is used for selectively shedding the load of the local power grid of the receiving end city according to the magnitude of the power received by the local power grid of the receiving end city from the main network before the corresponding fault in the control command.
Preferably, the main networking line monitoring device is further configured to send an isolated network operation state signal to the isolated network operation generator adjusting device and the isolated network operation load shedding device when it is determined that the local power grid of the receiving-end city is in an isolated network operation state.
The implementation of the invention has the following beneficial effects: according to the control system provided by the invention, when a local power grid of a receiving end city has a networking-to-isolated power grid fault, the isolated grid fault generator quick adjusting device adjusts the output power of the generator in the local power grid of the receiving end city according to a control command, the isolated grid fault quick load shedding device cuts off the load of the local power grid of the receiving end city according to the control command, when the local power grid of the receiving end city is in an isolated grid operation state, the isolated grid operation generator adjusting device adjusts the output power of the generator in the local power grid of the receiving end city according to an isolated grid operation state signal by using the frequency and the voltage of the local power grid of the receiving end city, the isolated grid operation load shedding device selects to cut off the load of the local power grid of the receiving end city according to the isolated grid operation state signal by using the frequency and the voltage of the local power grid of the receiving end city, after the isolated grid of the local power grid of the receiving end city is formed, the frequency and the voltage of the local power grid of the receiving end city can be used for fine continuous adjustment, the control cost is low, and the problem of over-control or under-control is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a receiving-end city local power grid isolated grid operation control system provided by the invention.
Fig. 2 is a control flow chart of the isolated network operation control system of the receiving-end city local power grid provided by the invention.
Detailed Description
The invention provides a receiving end city local power grid isolated network operation control system, as shown in figure 1, comprising: the system comprises a networking line monitoring device, a fast regulating device of an isolated network fault generator, a fast load shedding device of an isolated network fault, a regulating device of an isolated network running generator and an isolated network running load shedding device.
The networking circuit monitoring device is used for acquiring voltage signals and current signals of a local power grid of a receiving end city, judging whether the operation state of the local power grid of the receiving end city and the networking-to-isolated network fault between the local power grid of the receiving end city and a main network occur or not according to the voltage signals and the current signals of the local power grid of the receiving end city, and sending a control command to the isolated network fault generator quick adjusting device and the isolated network fault quick load shedding device when the networking-to-isolated network fault occurs between the local power grid of the receiving end city and the main network.
The isolated network fault generator rapid adjusting device is used for adjusting the output power of the generator in the local power grid of the receiving end city according to the control command.
The isolated network fault rapid load shedding device is used for shedding the load of a local power grid of a receiving end city according to a control command.
The isolated network operation generator adjusting device is used for adjusting the output power of a generator in a local power grid of a receiving end city according to an isolated network operation state signal, and the isolated network operation generator adjusting device automatically adjusts and controls according to the frequency and the voltage of the local power grid of the receiving end city after receiving the isolated network operation state signal.
The isolated network operation load shedding device is used for selectively shedding the load of the local power grid of the receiving end city according to the isolated network operation state signal, and automatically selects to shed the load of the local power grid of the receiving end city according to the frequency and the voltage of the local power grid of the receiving end city after receiving the isolated network operation state signal.
Specifically, the isolated network fault generator rapid adjusting device collects three-phase voltage and three-phase current signals of the generator, calculates the frequency, real-time power and adjustable capacity of the generator according to the collected three-phase voltage and three-phase current signals, and receives and executes a command of the networked line monitoring device when a networked to isolated network fault occurs.
The isolated network fault rapid load switching device collects the bus three-phase voltage and the load outgoing line three-phase current of a station (a transformer substation or a power plant), calculates the frequency and the switchable load capacity of the station, and receives and executes a control command of the networked line monitoring device when a networked to isolated network fault occurs.
The isolated network operation generator adjusting device collects three-phase voltage and three-phase current signals of the generator, calculates the frequency, real-time power and adjustable capacity of the generator, receives the isolated network operation state of the networking line monitoring device during isolated network operation, opens the isolated network operation adjusting function of the power plant after receiving the isolated network operation state signals, and adjusts the three-phase voltage and the three-phase voltage according to the real-time frequency of the power plant.
The isolated network operation load shedding device collects the three-phase voltage of a bus and the three-phase current of each load outgoing line of the station (a transformer substation or a power plant), calculates the frequency and the load shedding capacity of the station, receives the isolated network operation state of the networking line monitoring device during isolated network operation, opens the isolated network operation load shedding function of the station after receiving the isolated network operation state, and carries out load shedding control according to the real-time frequency and the voltage of the station.
Furthermore, the operation control system comprises a plurality of networking line monitoring devices, wherein one networking line monitoring device is a main networking line monitoring device. At each substation or power plant, a network line monitoring device is installed, and the main network line monitoring device is communicated with other devices in the operation control system.
Each networking line monitoring device is used for acquiring three-phase voltage, three-phase current and switch position signals of a networking line between a substation or a power plant of a local power grid of a receiving end city where the networking line monitoring device is located and a main grid.
And the other networking line monitoring devices except the main networking line monitoring device in the plurality of networking line monitoring devices are also used for transmitting the three-phase voltage, the three-phase current and the switch position signal of the corresponding networking line to the main networking line monitoring device.
The main networking line monitoring device is used for calculating the power of a networking line according to the three-phase voltage, the three-phase current and a switch position signal of the networking line, comparing the magnitude between the three-phase current and a set current threshold value of the networking line and the magnitude between the power of the networking line and the set power threshold value, judging whether a switch between a transformer substation or a power plant and a main network is in a brake separating state or not according to the switch position signal, judging whether the networking line is in a break state or not when the three-phase current of the networking line is smaller than the set current threshold value and the power of the networking line is smaller than the set power threshold value and whether the switch of the networking line between the transformer substation or the power plant and the main network is in the break state or not, otherwise judging that the networking line is in an outage, judging that a receiving end local power grid and the main network are in an operation state when at least one networking line between the transformer substation or the power plant and the main network is in an operation, judging that the receiving end local power grid is in an isolated network operation state when the last networking line between the transformer substation or the power plant and the main network is in an isolated network fault occurs, and judging that the urban network is in an isolated network fault occurs.
The main networking circuit monitoring device is further used for firstly sending a control command to the isolated network fault generator quick adjusting device when the local power grid of the receiving end city has networking to isolated network faults so as to control the isolated network fault generator quick adjusting device to adjust the output power of the generator in the local power grid of the receiving end city, and if the required adjustment amount corresponding to the output power of the generator exceeds the adjustable range of the generator, the main networking circuit monitoring device also sends a control command to the isolated network fault quick load shedding device so as to control the isolated network fault quick load shedding device to shed the load of the local power grid of the receiving end city for supplementing the rest required adjustment amount of the part exceeding the adjustable range of the generator.
The main networking line monitoring device is further used for generating a control command according to the magnitude of power received by the local power grid of the receiving end city from the main network before a fault after all switches on the substation of the local power grid of the receiving end city or the networking line between the power plant and the main network trip due to the fault, and sending the control command to the isolated network fault generator quick adjusting device and the isolated network fault quick load cutting device.
The isolated network fault generator rapid adjusting device is used for adjusting the output power of the generator in the local power grid of the receiving end city according to the received power of the local power grid of the receiving end city from the main grid before the fault corresponding to the control command.
And the isolated network fault rapid load shedding device is used for selectively shedding the load of the local power grid of the receiving end city according to the magnitude of the power received by the local power grid of the receiving end city from the main network before the fault corresponding to the control command.
Furthermore, the main networking line monitoring device is also used for sending an isolated network operation state signal to the isolated network operation generator adjusting device and the isolated network operation load cutting device when the receiving end city local power grid is judged to be in an operation isolated network state.
Fig. 2 is a control flow chart of the isolated network operation control system of the local power grid of the receiving-end city provided by the invention, and the control process is as follows:
1. the networking line monitoring device judges whether a local power grid of a receiving end city where the control system is located is in a networking operation state or an isolated network operation state, when the local power grid is in the networking operation state, the networking line monitoring device does not send any control command and isolated network operation state signals to other devices, and the control system does not have any control measures.
2. When the last networking line between the local receiving end city power grid and the main grid trips, a networking-to-isolated grid fault is judged to occur, at the moment, control measures are taken according to the magnitude of power received by the local receiving end city power grid from the main grid before the fault, the received power is used as required adjustment quantity, when the required adjustment quantity is smaller than or equal to the sum of the adjustable quantities of all generators in the local receiving end city power grid before the fault (defined as the adjustable range of the generators), the networking line monitoring device only sends a control command to the isolated grid fault generator rapid adjusting device, otherwise, the output of the generators is adjusted according to the adjustable range of the generators, and the rest required adjustment quantity is sent to the isolated grid fault rapid load shedding device for load shedding control.
3. When the isolated network voltage and frequency exceed the allowable fluctuation range 2 (fluctuation is not serious), the isolated network operation load cutting device cuts off part of load after time delay, and the isolated network operation receiving end local power grid is recovered to be normal.
When the control system provided by the invention has a fault of converting the networking into the isolated network, control measures are taken according to the power received by the urban local power grid from the main network at the receiving end before the fault, the power unbalance amount of the local isolated network can be quickly balanced, conditions are provided for continuous power supply of the local isolated network, the output of a generator is preferentially adjusted during adjustment and control, and the control cost is reduced. When the isolated network of the local power grid of the receiving end city operates, the isolated network operation generator adjusting device preferentially carries out fine continuous tracking adjustment according to isolated network frequency and voltage, so that the probability of over-control or under-control is reduced. The system can reduce the power failure probability of local power grids of receiving-end cities under extreme conditions and improve the power supply reliability.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments and it is not intended to limit the invention to the specific embodiments described. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (4)
1. The utility model provides a receive end city local electric network isolated network operation control system which characterized in that includes: the system comprises a networking line monitoring device, a single-grid fault generator quick adjusting device, a single-grid fault quick load cutting device, a single-grid operation generator adjusting device, a single-grid operation load cutting device and a plurality of networking line monitoring devices;
the networking line monitoring device is used for acquiring voltage signals and current signals of a local power grid of a receiving end city, judging whether the operation state of the local power grid of the receiving end city and the networking-to-isolated network fault between the local power grid of the receiving end city and a main network occur or not according to the voltage signals and the current signals of the local power grid of the receiving end city, and sending a control command to the isolated network fault generator rapid adjusting device and the isolated network fault rapid load shedding device when the networking-to-isolated network fault occurs between the local power grid of the receiving end city and the main network;
the isolated network fault generator rapid adjusting device is used for adjusting the output power of the generator in the local power grid of the receiving end city according to the control command;
the isolated network fault rapid load shedding device is used for shedding the load of the local power grid of the receiving end city according to the control command;
the isolated grid operation generator adjusting device is used for adjusting the output power of the generator in the receiving end urban local power grid by using the frequency and the voltage of the receiving end urban local power grid according to the isolated grid operation state signal;
the isolated network operation load shedding device is used for selectively shedding the load of the receiving-end urban local power grid by using the frequency and the voltage of the receiving-end urban local power grid according to the isolated network operation state signal;
each networking line monitoring device is used for acquiring three-phase voltage, three-phase current and switch position signals of a networking line between a substation or a power plant of a local power grid of a receiving end city where the networking line monitoring device is located and a main grid;
one of the plurality of networking line monitoring devices is a main networking line monitoring device, and the other networking line monitoring devices except the main networking line monitoring device in the plurality of networking line monitoring devices are also used for sending the three-phase voltage, the three-phase current and the switch position signal of the corresponding networking line to the main networking line monitoring device;
the main networking line monitoring device is used for calculating the power of a networking line according to the three-phase voltage, the three-phase current and a switch position signal of the networking line, comparing the three-phase current of the networking line with a set current threshold value, comparing the power of the networking line with the set power threshold value, and judging whether the transformer substation or a switch between the power plant and a main network is in a brake separating state or not according to the switch position signal.
2. The isolated grid operation control system of the receiving-end urban local power grid according to claim 1, wherein the main networking line monitoring device is further configured to send a control command to the isolated grid fault generator fast adjustment device to control the isolated grid fault generator fast adjustment device to adjust the output power of the generator in the receiving-end urban local power grid when the receiving-end urban local power grid has a networking to isolated grid fault, and if a required adjustment amount corresponding to the output power of the generator exceeds an adjustable range of the generator, the main networking line monitoring device also sends a control command to the isolated grid fault fast load shedding device to control the isolated grid fault fast load shedding device to shed the load of the receiving-end urban local power grid for a portion exceeding the adjustable range of the generator.
3. The isolated operation control system of the receiving-end urban local power grid according to claim 1, wherein the main interconnection line monitoring device is further configured to generate a control command according to the magnitude of power received by the receiving-end urban local power grid from the main grid before a fault after all switches on the interconnection line between the power plant and the main grid or the substation of the receiving-end urban local power grid are tripped due to the fault, and send the control command to the isolated fault generator fast adjusting device and the isolated fault fast load shedding device;
the isolated network fault generator rapid adjusting device is used for adjusting the output power of the generator in the local power grid of the receiving end city according to the power received by the local power grid of the receiving end city from the main grid before the fault corresponding to the control command;
and the isolated network fault rapid load shedding device is used for selectively shedding the load of the local power grid of the receiving end city according to the magnitude of the power received by the local power grid of the receiving end city from the main network before the corresponding fault in the control command.
4. The isolated network operation control system of the receiving-end urban local power grid according to claim 1, wherein the main networking line monitoring device is further configured to send an isolated network operation state signal to the isolated network operation generator adjusting device and the isolated network operation load shedding device when it is determined that the receiving-end urban local power grid is in an operation isolated network state.
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