CN115580005A - Method and equipment for realizing segmented spare power automatic switching based on anti-islanding strategy - Google Patents
Method and equipment for realizing segmented spare power automatic switching based on anti-islanding strategy Download PDFInfo
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- CN115580005A CN115580005A CN202211096182.8A CN202211096182A CN115580005A CN 115580005 A CN115580005 A CN 115580005A CN 202211096182 A CN202211096182 A CN 202211096182A CN 115580005 A CN115580005 A CN 115580005A
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The invention provides a method and equipment for realizing segmented spare power automatic switching based on an anti-islanding strategy, which are applied to an electrochemical energy storage power station, wherein the method comprises the steps of entering a charging state based on charging logic; starting the device based on the starting logic when the electrochemical cell and the adjacent power grid form an unplanned island; after the device is started, a tripping instruction is sent out based on the anti-islanding logic to control the tripping of a main supply circuit switch of a corresponding bus, and the starting logic corresponds to the corresponding anti-islanding protection logic; and after the island operation state is relieved, the standby power supply is switched on based on the standby power automatic switching logic, and the power supply of the voltage-losing bus is recovered. By adding the control strategy of the sectional spare power automatic switching device of the anti-islanding strategy, the problem that the existing standard sectional spare power automatic switching method cannot act correctly in the electrochemical energy storage power station is solved, the formation of an unplanned islanding is avoided, and the running stability and reliability of the electrochemical energy storage power station and a power grid are improved.
Description
Technical Field
The invention belongs to the technical field of power grid protection, and particularly relates to a method and equipment for realizing sectional spare power automatic switching based on an anti-islanding strategy, which are applied to an electrochemical energy storage power station.
Background
With the development of energy storage technology, electrochemical energy storage power stations are gradually applied to a plurality of links such as sources, networks, loads and the like of power systems. The novel power system has higher requirements on functions such as peak-load frequency modulation, flexible output, reactive power support and the like, the traditional pumped storage power station can only absorb water energy, and can only rely on electrochemical batteries with high energy density, multiple cycle times and small size for absorbing new energy such as solar energy, wind energy and the like, so that the electrochemical storage power station is rapidly developed on the 10kV power grid side in recent years.
An urgent problem to be solved when the electrochemical energy storage power station is applied to a 10kV power grid side is the matching problem of a 10kV sectional spare power automatic switching device and anti-islanding protection. The existing 10kV subsection spare power automatic switching device cannot correctly realize functions in an electrochemical energy storage power station, and after a main power supply is lost, an electrochemical battery is connected into a 10kV bus to be connected with a load to form an island after being boosted by an energy storage transformer, so that the 10kV bus still has higher voltage after the main power supply is lost, the condition that the voltage of the bus is required to be detected when the subsection spare power automatic switching device is started is not met, and the subsection spare power automatic switching device cannot be correctly started. Only after the isolated island is in unstable operation and is disconnected, the bus voltage-free condition of the sectional spare power automatic switching device is met, the sectional spare power automatic switching device can be started and jump with the main power supply after the isolated island is disconnected, the sectional switch is controlled to be switched on, and the spare power supply is switched on to restore the power supply of the voltage-lost bus. In addition, unplanned islanding operation can also damage electrical equipment, cause grid reclosing failure, and even threaten the life safety of workers on the power line. Therefore, a sectional backup power automatic switching method for an electrochemical energy storage power station is needed to realize the rapid automatic switching of a backup power supply of the electrochemical energy storage power station.
Disclosure of Invention
In view of this, the invention aims to provide a method for realizing the segmented backup power automatic switching based on an anti-islanding strategy, so as to realize the rapid automatic switching of the backup power supply of an electrochemical energy storage power station.
In order to achieve the technical effects, the invention provides the following technical scheme:
in a first aspect, the invention provides a method for realizing segmented spare power automatic switching based on an anti-islanding strategy, which is applied to an electrochemical energy storage power station and comprises the following steps:
the spare power automatic switching device enters a charging state based on the charging logic;
when the electrochemical battery and an adjacent power grid form an unplanned island, starting the spare power automatic switching device based on starting logic;
after the device is started, the spare power automatic switching device sends a tripping instruction based on anti-islanding logic to control a main supply line switch of a corresponding bus to trip, and the starting logic corresponds to corresponding anti-islanding protection logic;
and after the island operation state is relieved, the spare power automatic switching device switches into a spare power supply based on the spare power automatic switching logic and recovers the power supply of the voltage-loss bus.
Further, the charging logic is specifically:
all charging conditions are satisfied and last for a first time constant value T c1 Thereafter, the device enters a charging state. If any of the charging conditions is not satisfied, the device does not enter a charging state.
Further, the charging conditions specifically include:
the three-phase voltage of the two-section bus is greater than a fixed voltage value U y The sectionalizing switch is put into operation with the functions of automatic spare power switching.
Further, the start logic specifically includes: low voltage start, high voltage start, low frequency start and high frequency start;
the low-voltage starting means that the maximum phase voltage of any bus is lower than a setting value U when low-voltage protection is put into operation d1 The device is started;
the high-voltage starting means that the minimum phase voltage of any bus is higher than a setting value U when high-voltage protection is put into operation g1 When the device is started;
the low-frequency starting means that when the low-frequency protection is put into operation, the frequency of any bus is lower than a setting value F d1 When the device is started;
the high-frequency starting means that when the high-frequency protection is put into operation, the frequency of any bus is higher than a setting value F g1 The device is started.
Further, the anti-islanding logic specifically includes: low voltage protection, high voltage protection, low frequency protection and high frequency protection;
the low-voltage protection means that after the low-voltage is started, the maximum phase voltage of any bus is in a first setting time T vd Internal lower than setting value U d2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
High voltage protection refers to the protection of the circuit after high voltage startup,the minimum phase voltage of any bus is at a set time T vg U higher than setting value g2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
The low-frequency protection means that after the low-frequency starting, any bus frequency is in a setting time T fd Internal lower than setting value F d2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
The high-frequency protection means that after high-frequency starting, any bus frequency is in a setting time T fg Internal higher than setting value F g2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
Further, the spare power automatic switching logic comprises: judging logic;
the judgment logic is that the value T is set at the second time c2 The bus incoming line switch which internally meets the requirement of preventing logic tripping of an island is separated, the corresponding bus is not pressurized, and the main supply line is not flowed.
Further, the spare power automatic switching logic further comprises: an action logic;
the action logic is specifically that after the judgment logic is completed, a closing instruction is sent to control the section switch to close, whether the acceleration condition after all faults is met is judged, if yes, a tripping instruction is sent immediately to control the section switch to trip, and the spare power automatic switching fails; and if the condition for accelerating after the fault is not met and the voltage of the voltage-loss bus is recovered to be normal, the spare power automatic switching is successful.
Further, the post-fault acceleration condition specifically includes:
any incoming current is greater than fault current setting value I d And any bus meets any composite voltage opening condition.
Further, the composite voltage open condition specifically includes:
setting value U that bus voltage is greater than voltage d The zero sequence voltage of the bus is greater than the setting value U 0 The negative sequence voltage of the bus is greater than the setting value U 2 。
In a second aspect, the invention provides an electrochemical energy storage power station sectional spare power automatic switching implementation device based on an anti-islanding strategy, which is applied to an electrochemical energy storage power station, and comprises a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the implementation method of the sectional spare power automatic switching based on the anti-islanding strategy according to the instructions of the computer program.
In summary, the invention provides a method and a device for realizing the segmented spare power automatic switching based on an anti-islanding strategy, which are applied to an electrochemical energy storage power station, wherein the method comprises the steps of entering a charging state based on charging logic; starting the device based on starting logic when the electrochemical battery and an adjacent power grid form an unplanned island; after the device is started, a tripping instruction is sent out based on the anti-islanding logic to control the tripping of a main supply circuit switch of a corresponding bus, and the starting logic corresponds to the corresponding anti-islanding protection logic; and after the island operation state is relieved, the standby power supply is switched on based on the standby power automatic switching logic, and the power supply of the voltage-losing bus is recovered. By adding the control strategy of the sectional spare power automatic switching device of the anti-islanding strategy, the problem that the existing standard sectional spare power automatic switching method cannot act correctly in the electrochemical energy storage power station is solved, the formation of an unplanned islanding is avoided, and the running stability and reliability of the electrochemical energy storage power station and a power grid are improved.
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, and 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 these drawings without inventive exercise.
Fig. 1 is a schematic flow diagram of a method for implementing a segment backup power automatic switching based on an anti-islanding strategy according to an embodiment of the present invention;
fig. 2 is a detailed flowchart of a method for implementing a segment backup power automatic switching based on an anti-islanding strategy according to an embodiment of the present invention;
fig. 3 is a wiring diagram of an electrochemical energy storage power station provided by an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. 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.
With the development of energy storage technology, electrochemical energy storage power stations are gradually applied to a plurality of links such as sources, networks, loads and the like of power systems. The novel power system has higher requirements on functions such as peak-load frequency modulation, flexible output, reactive power support and the like, the traditional pumped storage power station can only absorb water energy, and can only rely on electrochemical batteries with high energy density, multiple cycle times and small size for absorbing new energy such as solar energy, wind energy and the like, so that the electrochemical storage power station is rapidly developed on the 10kV power grid side in recent years.
An urgent problem to be solved when the electrochemical energy storage power station is applied to a 10kV power grid side is the matching problem of a 10kV sectional spare power automatic switching device and anti-islanding protection. The existing 10kV subsection spare power automatic switching device cannot correctly realize functions in an electrochemical energy storage power station, and after a main power supply is lost, an electrochemical battery is connected to a 10kV bus to be connected with a load to form an island after being boosted by energy storage transformer, so that the 10kV bus still has higher voltage after the main power supply is lost, the condition that the bus voltage is required to be detected when the subsection spare power automatic switching device is started is not met, and the subsection spare power automatic switching device cannot be correctly started. Only after the isolated island is in unstable operation and is disconnected, the bus voltage-free condition of the sectional spare power automatic switching device is met, the sectional spare power automatic switching device can be started and jump with the main power supply after the isolated island is disconnected, the sectional switch is controlled to be switched on, and the spare power supply is switched on to restore the power supply of the voltage-lost bus. In addition, unplanned islanding operation can also damage electrical equipment, cause grid reclosing failure, and even threaten the life safety of workers on the power line.
Based on the method, the equipment and the storage medium, the invention provides a segmented spare power automatic switching implementation method, equipment and storage medium based on an anti-islanding strategy, which are applied to an electrochemical energy storage power station.
The following describes in detail an embodiment of the invention, which is applied to an electrochemical energy storage power station and is based on an anti-islanding strategy, of a segment backup power automatic switching implementation method.
Referring to fig. 1, the present embodiment provides a method for implementing a segment backup power automatic switching based on an anti-islanding strategy, including the following steps:
s100: the backup power automatic switching device enters a charging state based on the charging logic.
The charging logic is the criterion for the device to enter a charging state. All charging conditions are satisfied and last for T c1 After time, the device enters a charging state. If any of the charging conditions is not satisfied, the device does not enter a charging state.
The charging conditions include: the three-phase voltage of the two-section bus is greater than a fixed voltage value U y The section switch is separated and the spare power automatic switching function is used.
S200: when the electrochemical battery and the adjacent power grid form an unplanned island, the spare power automatic switching device is started based on the starting logic.
The boot logic is a prerequisite for device boot. When the electrochemical battery and the adjacent power grid form an unplanned island, the bus voltage and the frequency are abnormal, and therefore the bus voltage and the frequency are used as criteria for judging whether the electrochemical battery and the adjacent power grid form the unplanned island.
The startup logic includes: the method comprises the following steps of low-voltage starting, high-voltage starting, low-frequency starting and high-frequency starting, wherein starting logics correspond to corresponding anti-islanding protection logics respectively.
The low-voltage starting means that the maximum phase voltage of any bus is lower than a setting value U when low-voltage protection is put into operation d1 The device is started.
The high-voltage starting means that the minimum phase voltage of any bus is higher than a setting value U when high-voltage protection is put into operation g1 The device is started.
The low-frequency starting means that when the low-frequency protection is put into operation, the frequency of any bus is lower than a setting value F d1 The device is started.
The high frequency starting meansWhen high-frequency protection is put into use, the frequency of any bus is higher than a setting value F g1 The device is started.
S300: after the device is started, the spare power automatic switching device sends a tripping instruction based on the anti-islanding logic to control the main supply line switch of the corresponding bus to trip, and the starting logic corresponds to the corresponding anti-islanding protection logic.
Anti-islanding logic is the basis by which a device switches off non-islanding. The anti-islanding logic comprises: low voltage protection, high voltage protection, low frequency protection, high frequency protection. After the device is started, the anti-islanding protection action corresponding to the starting element sends a tripping instruction to control the tripping of the main supply circuit switch of the corresponding bus, so that the islanding operation state is relieved.
The low-voltage protection means that after the low-voltage is started, the maximum phase voltage of any bus is at a set time T vd Internal lower than setting value U d2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
The high-voltage protection means that after the high voltage is started, the minimum phase voltage of any bus is at the set time T vg U higher than setting value g2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
The low-frequency protection means that after the low-frequency starting, the frequency of any bus is in the setting time T fd Internal lower than setting value F d2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
The high-frequency protection means that after high-frequency starting, any bus frequency is in a setting time T fg Internal higher than setting value F g2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
S400: and after the island operation state is relieved, the spare power automatic switching device switches into a spare power supply based on the spare power automatic switching logic to recover the power supply of the voltage-loss bus.
The spare power automatic switching logic is the basis for switching a spare power supply. The spare power automatic switching logic comprises: decision logic and action logic.
The judgment logic is used for judging whether the electrochemical battery forming the unplanned island is disconnected with the power grid or not and meeting the requirement of switching on a standby power supplyEntering the condition. The judgment logic is that the value T is set at the second time c2 The bus incoming line switch which internally meets the requirement of preventing logic tripping of an island is separated, the corresponding bus is not pressurized, and the main supply line is not flowed.
The bus incoming line switch is subjected to position judgment through the acquisition switch in a separated mode, and the bus voltage absence refers to that the three-phase voltage of the corresponding bus is lower than a voltage absence fixed value U w The main supply line is currentless, namely that the three-phase current of the main supply line is lower than a currentless fixed value I w 。
And the action logic is used for quickly switching into a standby power supply and recovering the power supply of the voltage-loss bus. The action logic means that after the judgment logic is completed, a closing instruction is sent to control the section switch to close, whether the acceleration condition after all faults is met is judged, if yes, a tripping instruction is sent immediately to control the section switch to trip, and the spare power automatic switching fails; and if the condition for accelerating after the fault is not met and the voltage of the voltage-loss bus is recovered to be normal, the spare power automatic switching is successful.
The post-fault acceleration condition is used for judging whether the section switch is in fault, and comprises the following steps: any inlet wire current is greater than fault current setting value I d And any bus meets any composite voltage condition.
The composite voltage condition is used for judging whether the bus voltage is abnormal or not, and comprises the following steps: setting value U that bus voltage is greater than voltage d The zero sequence voltage of the bus is greater than the setting value U 0 The negative sequence voltage of the bus is greater than the setting value U 2 。
Fig. 2 is a detailed flowchart of the device executing the charging logic, the starting logic, the anti-islanding logic, and the backup automatic switching logic at one time. Fig. 3 is a wiring diagram of an electrochemical energy storage power station, in which a 10kV bus is connected to an energy storage battery through an energy storage transformer, and a section switch and a main supply switch are in a conventional arrangement.
The embodiment provides a method, equipment and a storage medium for realizing the segmented spare power automatic switching based on an anti-islanding strategy, which are applied to an electrochemical energy storage power station, and the method comprises the steps of entering a charging state based on charging logic; starting the device based on the starting logic when the electrochemical cell and the adjacent power grid form an unplanned island; after the device is started, a tripping instruction is sent out based on the anti-islanding logic to control the tripping of a main supply circuit switch of a corresponding bus, and the starting logic corresponds to the corresponding anti-islanding protection logic; and after the island operation state is relieved, the standby power supply is switched on based on the standby power automatic switching logic, and the power supply of the voltage-losing bus is recovered. According to the invention, by adding the control strategy of the sectional spare power automatic switching device of the anti-islanding strategy, the problem that the existing standard sectional spare power automatic switching method cannot correctly act in the electrochemical energy storage power station is solved, the formation of an unplanned islanding is also avoided, and the stability and reliability of the operation of the electrochemical energy storage power station and a power grid are improved.
The above is a detailed description of an embodiment of the method for implementing the sectional backup power automatic switching based on the anti-islanding strategy, which is applied to the electrochemical energy storage power station, of the present invention, and the following is a detailed description of an embodiment of the device for implementing the sectional backup power automatic switching based on the anti-islanding strategy, which is applied to the electrochemical energy storage power station, of the present invention.
The embodiment provides a segmented spare power automatic switching implementation device based on an anti-islanding strategy, which comprises a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the method for realizing the segmented spare power automatic switching based on the anti-islanding strategy according to the instructions of the computer program.
The above is a detailed description of an embodiment of the invention, which is applied to an electrochemical energy storage power station and is based on an anti-islanding strategy, of a segment spare power automatic switching implementation device, and the following is a detailed description of an embodiment of a computer storage medium of the invention.
The embodiment provides a computer storage medium, and a computer program is stored on the computer readable storage medium, and when executed by a processor, the computer program implements a method for implementing a segmented spare power automatic switching based on an anti-islanding policy according to the foregoing embodiment.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for realizing the segmented spare power automatic switching based on an anti-islanding strategy is characterized by being applied to an electrochemical energy storage power station and comprising the following steps:
the spare power automatic switching device enters a charging state based on the charging logic;
when the electrochemical battery and an adjacent power grid form an unplanned island, the spare power automatic switching device is started based on starting logic;
after the device is started, the spare power automatic switching device sends a tripping instruction based on anti-islanding logic to control a main power supply circuit switch of a corresponding bus to trip, and the starting logic corresponds to the anti-islanding protection logic;
and when the island operation state is relieved, the spare power automatic switching device switches into a spare power supply based on the spare power automatic switching logic, and recovers the power supply of the voltage-loss bus.
2. The method for realizing the automatic sectionalizing power supply based on the anti-islanding strategy according to claim 1, wherein the charging logic is specifically as follows:
all charging conditions are satisfied and last for a first time constant value T c1 Then, the device enters a charging state; if any of the charging conditions is not satisfied, the device does not enter a charging state.
3. The method for realizing the segmented automatic power switching based on the anti-islanding strategy according to claim 2, wherein the charging condition specifically comprises:
the three-phase voltage of the two-section bus is greater than a fixed voltage value U y The automatic transfer switch comprises a section switch and a spare power automatic transfer function.
4. The method for realizing the segmented spare power automatic switching based on the anti-islanding strategy according to claim 1, wherein the starting logic specifically comprises: low voltage start, high voltage start, low frequency start and high frequency start;
the low-voltage starting means that the maximum phase voltage of any bus is lower than a setting value U when low-voltage protection is put into operation d1 The device is started;
the high-voltage starting means that the minimum phase voltage of any bus is higher than a setting value U when high-voltage protection is put into operation g1 When the device is started;
the low-frequency starting means that when the low-frequency protection is put into operation, the frequency of any bus is lower than a setting value F d1 When the device is started;
the high-frequency starting means that when high-frequency protection is put into operation, the frequency of any bus is higher than a setting value F g1 The device is started.
5. The method for implementing the sectionalized automatic power switch based on the anti-islanding strategy according to claim 4, wherein the anti-islanding logic specifically comprises: low voltage protection, high voltage protection, low frequency protection and high frequency protection;
the low-voltage protection means that after the low-voltage is started, the maximum phase voltage of any bus is in a first setting time T vd Internal lower than setting value U d2 The device sends a tripping command to control the tripping of a main supply circuit switch of the corresponding bus;
the high-voltage protection means that after the high voltage is started, the minimum phase voltage of any bus is at the set time T vg U higher than setting value g2 The device sends a tripping command to control the tripping of a main supply circuit switch of the corresponding bus;
the low-frequency protection means that after the low-frequency starting, the frequency of any bus is in the setting time T fd Internal lower than setting value F d2 The device sends a tripping command to control the tripping of a main supply circuit switch of the corresponding bus;
the high-frequency protection means that after high-frequency starting, any bus frequency is in a setting time T fg Internal higher than setting value F g2 And the device sends a tripping command to control the tripping of the main supply circuit switch of the corresponding bus.
6. The method for realizing the segmented automatic power switching based on the anti-islanding strategy according to claim 1, wherein the automatic power switching logic comprises: judging logic;
the judgment logic is specifically to set a value T at a second time c2 And the division of the bus incoming line switch which internally meets the requirement of preventing the logic tripping of the island, the non-voltage of the corresponding bus and the non-current of the main supply line are met.
7. The method for implementing the sectionalized automatic power switching based on the anti-islanding strategy according to claim 6, wherein the automatic power switching logic further comprises: an action logic;
the action logic is specifically that after the judgment logic is completed, a closing instruction is sent to control the section switch to close, whether the acceleration condition after all faults is met is judged, if yes, a tripping instruction is sent immediately to control the section switch to trip, and the spare power automatic switching fails; and if the condition for accelerating after the fault is not met and the voltage of the voltage-loss bus is recovered to be normal, the spare power automatic switching is successful.
8. The method for realizing the sectionalized automatic power switch-on based on the anti-islanding strategy according to claim 7, wherein the post-fault acceleration condition specifically includes:
any incoming current is greater than fault current setting value I d And any bus meets any composite voltage opening condition.
9. The method for realizing the automatic sectionalizing power supply based on the anti-islanding strategy according to claim 8, wherein the composite voltage open condition specifically comprises: bus voltage is greater than voltage setting value U d The zero sequence voltage of the bus is greater than the setting value U 0 The negative sequence voltage of the bus is greater than the setting value U 2 。
10. The device is characterized by comprising a processor and a memory, wherein the processor is used for:
the memory is used for storing a computer program and sending instructions of the computer program to the processor;
the processor executes the segmented spare power automatic switching implementation method based on the anti-islanding strategy according to any one of claims 1 to 9.
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| CN202211096182.8A CN115580005A (en) | 2022-09-08 | 2022-09-08 | Method and equipment for realizing segmented spare power automatic switching based on anti-islanding strategy |
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