CN115411754B - Incoming spare power automatic switching method and device for energy storage power station - Google Patents

Incoming spare power automatic switching method and device for energy storage power station Download PDF

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Publication number
CN115411754B
CN115411754B CN202211359206.4A CN202211359206A CN115411754B CN 115411754 B CN115411754 B CN 115411754B CN 202211359206 A CN202211359206 A CN 202211359206A CN 115411754 B CN115411754 B CN 115411754B
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frequency
automatic switching
voltage
preset
mode
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CN115411754A (en
Inventor
李新海
罗海鑫
刘文平
梅龙军
周恒�
郭法安
曾威
刘德志
姚光久
侯伟
程思举
尹雁和
袁拓来
陈伟明
关振坚
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Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an incoming spare power automatic switching method and device of an energy storage power station, wherein the method comprises the following steps: the method comprises the steps of obtaining bus voltage data, bus frequency data, line switch information and incoming line state information of an energy storage power station, judging whether an incoming line spare power automatic switching device meets a preset charging condition, if so, enabling the incoming line spare power automatic switching device to enter the charging state, selecting a starting mode and a protection mode when the incoming line spare power automatic switching device enters the charging state, judging whether the energy storage power station meets the preset spare power automatic switching condition, if so, controlling a power supply incoming line switch to perform closing operation, judging whether the bus voltage data and the line switch information meet a preset fault post-acceleration condition, if so, failing the incoming line spare power automatic switching operation, and if not, succeeding the incoming line spare power automatic switching operation. The method is favorable for solving the technical problem that the inlet wire spare power automatic switching device cannot be correctly started due to the island problem in the conventional inlet wire spare power automatic switching method, and ensures the stable and reliable operation of the energy storage power station.

Description

Incoming spare power automatic switching method and device for energy storage power station
Technical Field
The invention relates to the technical field of inlet wire spare power automatic switching of energy storage power stations, in particular to an inlet wire spare power automatic switching method and device of an 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 depend 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 incoming line spare power automatic switching device and anti-islanding protection. The existing 10kV incoming line spare power automatic switching device cannot correctly realize functions in an electrochemical energy storage power station, after a main power supply upper-level power grid fails to trip or lose voltage, an electrochemical battery is connected into a 10kV bus after being boosted by an energy storage transformer to form an island with an adjacent load, so that the 10kV bus of the electrochemical energy storage power station still has higher voltage, the condition that a detection bus of the incoming line spare power automatic switching device is started is not free of voltage is not met, and the device cannot be correctly started. After the island operation state continues to the unstability disconnection, 10kV bus voltage satisfies the voltage-free condition of the detection bus of the incoming line spare power automatic switching device, the device can be started and jump to the main power supply incoming line switch, after the energy storage power station is determined to be separated from the main power supply upper-level power grid, the spare power supply incoming line switch is controlled to be switched on, the electrochemical energy storage power station is connected with the spare power supply upper-level power grid, and the normal power supply of the electrochemical energy storage power station is recovered. 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, in order to ensure the stable and reliable operation of the energy storage power station, the technical problem that the inlet line backup automatic switching device cannot be started correctly due to the island problem of the existing inlet line backup automatic switching method is solved, and a need for constructing the inlet line backup automatic switching method of the energy storage power station is urgently needed.
Disclosure of Invention
The invention provides an incoming line spare power automatic switching method and device of an energy storage power station, and solves the technical problem that an incoming line spare power automatic switching device cannot be started correctly due to the island problem of the existing incoming line spare power automatic switching method.
In a first aspect, the invention provides an incoming spare power automatic switching method for an energy storage power station, which comprises the following steps:
s1, obtaining incoming line spare power automatic switching data of an energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
s2, judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and the step S3 is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and the step S1 is executed;
s3, selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters a charging state based on the bus voltage data and the bus frequency data;
s4, based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power supply inlet wire switch in the line switch information to perform closing operation, and executing the step S5; if not, returning to execute the step S1;
s5, judging whether the bus voltage data and the line switch information meet preset post-fault acceleration conditions or not; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to execute the step S1; and if not, determining that the inlet wire backup power automatic switching operation of the energy storage power station is successful through the voltage recovery.
Optionally, the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the protection mode comprises a voltage protection mode corresponding to the voltage starting mode and a frequency protection mode corresponding to the frequency starting mode; the step S3 includes:
step S31, determining a voltage starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus voltage data and a preset phase voltage threshold;
step S32, determining a frequency starting mode when the incoming line spare power automatic switching device enters a charging state based on the magnitude relation between the bus frequency data and a preset frequency threshold;
step S33, determining the corresponding voltage protection mode and the frequency protection mode based on the determined voltage start mode and the frequency start mode.
Optionally, the voltage start-up mode comprises a low voltage start-up mode and a high voltage start-up mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the step S31 includes:
when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value, selecting the low-voltage starting mode;
and when the minimum phase voltage data in the bus voltage data is larger than the preset second phase voltage threshold, selecting the high-voltage starting mode.
Optionally, the frequency start-up mode comprises a low frequency start-up mode and a high frequency start-up mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the step S32 includes:
when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold, selecting the low-frequency starting mode;
and when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold, selecting the high-frequency starting mode.
Optionally, the preset spare power automatic switching condition includes a fault isolation condition and a spare power supply network power supply switching condition; the S4 comprises the following steps:
step S41, judging whether the energy storage power station meets the fault isolation condition; if yes, go to step S42; if not, returning to execute the step S1;
step S42, based on the starting mode and the protection mode, the bus voltage data, the line switch information and the incoming line state information are combined, and whether the energy storage power station meets the power supply input condition of the standby power supply network or not is judged; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing the step S5; if not, returning to execute the step S1.
In a second aspect, the present invention provides an incoming spare power automatic switching device for an energy storage power station, including:
the acquisition module is used for acquiring incoming spare power automatic switching data of the energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
the charging module is used for judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and a selection module is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and returns to the execution acquisition module;
the selection module is used for selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters a charging state based on the bus voltage data and the bus frequency data;
the first judgment module is used for judging whether the energy storage power station meets a preset spare power automatic switching condition or not based on the starting mode and the protection mode by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing a second judgment module; if not, returning to the execution acquisition module;
the second judgment module is used for judging whether the bus voltage data and the line switch information meet the preset post-fault acceleration condition or not; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to the execution acquisition module; if not, the incoming line spare power automatic switching operation of the energy storage power station is determined to be successful through voltage recovery.
Optionally, the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the protection mode comprises a voltage protection mode corresponding to the voltage starting mode and a frequency protection mode corresponding to the frequency starting mode; the selection module comprises:
the voltage sub-module is used for determining a voltage starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus voltage data and a preset phase voltage threshold value;
the frequency sub-module is used for determining a frequency starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus frequency data and a preset frequency threshold;
and the protection sub-module is used for determining the corresponding voltage protection mode and the frequency protection mode based on the determined voltage starting mode and the frequency starting mode.
Optionally, the voltage start-up mode comprises a low voltage start-up mode and a high voltage start-up mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the voltage sub-module comprises:
the low-voltage submodule is used for selecting the low-voltage starting mode when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value;
and the high-voltage sub-module is used for selecting the high-voltage starting mode when the minimum phase voltage data in the bus voltage data is greater than the preset second phase voltage threshold value.
Optionally, the frequency start-up mode comprises a low frequency start-up mode and a high frequency start-up mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the frequency sub-module comprises:
the low-frequency submodule is used for selecting the low-frequency starting mode when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold;
and the high-frequency sub-module is used for selecting the high-frequency starting mode when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold.
Optionally, the preset spare power automatic switching condition includes a fault isolation condition and a spare power supply network power supply switching condition; the first judging module comprises:
the isolation submodule is used for judging whether the energy storage power station meets the fault isolation condition; if yes, executing a investing submodule; if not, returning to the execution acquisition module;
the input submodule is used for judging whether the energy storage power station meets the power input condition of the standby power supply network or not based on the starting mode and the protection mode by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power supply inlet wire switch in the circuit switch information to perform closing operation, and executing a second judging module; if not, returning to the execution acquisition module.
According to the technical scheme, the invention has the following advantages: the invention provides an incoming line spare power automatic switching method of an energy storage power station, which comprises the steps of S1, obtaining incoming line spare power automatic switching data of the energy storage power station, wherein the incoming line spare power automatic switching data comprise bus voltage data, bus frequency data, line switch information and incoming line state information, S2, judging whether an incoming line spare power automatic switching device meets preset charging conditions or not according to the bus voltage data, the line switch information and the incoming line state information, if so, the incoming line spare power automatic switching device enters a charging state, and executing the step S3, if not, the incoming line spare power automatic switching device does not enter the charging state, returning to the step S1 and the step S3, selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters the charging state based on the bus voltage data and the frequency data, and selecting the step S4, based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information, if so, controlling a spare power incoming line switch in the line switch information to perform a closing operation, executing the step S5, otherwise, returning to the step S1, judging whether the bus voltage data and the line switch information meet a preset fault rear acceleration condition or not, if so, determining that the incoming line spare power automatic switching operation of the energy storage power station fails, controlling the spare power incoming line switch to perform a tripping operation, returning to the step S1, otherwise, determining that the incoming line spare power automatic switching operation of the energy storage power station succeeds, the bus voltage data, the line switch information and the incoming line state information through voltage recovery, and judging whether the energy storage power station meets the preset spare power automatic switching condition or not, if yes, controlling a spare power supply inlet wire switch in the circuit switch information to perform a closing operation, executing a step S5, if not, returning to execute the step S1, and step S5, judging whether the bus voltage data and the circuit switch information meet preset post-fault acceleration conditions, if yes, determining that the inlet wire spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet wire switch to perform a tripping operation, and returning to execute the step S1, if not, determining that the inlet wire spare power automatic switching operation of the energy storage power station succeeds through voltage recovery, and solving the technical problem that an inlet wire spare power automatic switching device cannot be started correctly due to the fact that an island problem occurs in the existing inlet wire spare power automatic switching method, and guaranteeing stable and reliable operation of the energy storage power station.
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 flowchart of a first embodiment of an incoming spare power automatic switching method of an energy storage power station according to the present invention;
fig. 2 is a flowchart of a second embodiment of an incoming spare power automatic switching method of an energy storage power station according to the present invention;
fig. 3 is a block diagram of an incoming spare power automatic switching device of an energy storage power station according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an incoming line spare power automatic switching method and device of an energy storage power station, which are used for solving the technical problem that an incoming line spare power automatic switching device cannot be started correctly due to the island problem of the existing incoming line spare power automatic switching method.
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, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first embodiment, referring to fig. 1, fig. 1 is a flowchart of a first embodiment of an incoming spare power automatic switching method of an energy storage power station, including:
s101, obtaining incoming line spare power automatic switching data of an energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
it should be noted that an energy storage power station (specifically, an electrochemical energy storage power station) refers to a substation system that performs multiple-cycle electric energy storage, conversion, and release by using an electrochemical battery with high energy density, and realizes important functions such as flexible output, peak and frequency modulation, and reactive power support.
The automatic backup power switching device (i.e. automatic switching device for backup power supply) is a device which can quickly switch a substation with dual power supply or multiple power supply into a backup power supply after a main power supply is lost due to a failure.
Step S102, judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and step S103 is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and the step S101 is executed;
step S103, selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters a charging state based on the bus voltage data and the bus frequency data;
it should be noted that the start mode includes a voltage start mode and a frequency start mode; the voltage start-up mode comprises a low voltage start-up mode and a high voltage start-up mode; the frequency start-up mode includes a low frequency start-up mode and a high frequency start-up mode.
The protection mode comprises a voltage protection mode and a frequency protection mode; the voltage start-up mode comprises a low voltage protection mode and a high voltage protection mode; the frequency protection mode includes a low frequency protection mode and a high frequency protection mode.
In the embodiment of the invention, a voltage starting mode when the incoming line backup power automatic switching device enters a charging state is determined based on the magnitude relation between the bus voltage data and a preset phase voltage threshold, a frequency starting mode when the incoming line backup power automatic switching device enters the charging state is determined based on the magnitude relation between the bus frequency data and a preset frequency threshold, and the corresponding voltage protection mode and the corresponding frequency protection mode are determined based on the determined voltage starting mode and the determined frequency starting mode.
Step S104, based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing step S105; if not, returning to execute the step S101;
in the embodiment of the present invention, step S1041 is performed to determine whether the energy storage power station satisfies the fault isolation condition; if yes, go to step S1042; if not, returning to execute the step S101; step S1042, based on the starting mode and the protection mode, combining the bus voltage data, the line switch information and the incoming line state information, judging whether the energy storage power station meets the power supply input condition of the standby power supply network; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing step S105; if not, the process returns to step S101.
Step S105, judging whether the bus voltage data and the line switch information meet a preset post-fault acceleration condition; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to execute the step S101; if not, determining that the inlet wire backup power automatic switching operation of the energy storage power station is successful through the voltage recovery;
in the incoming line spare power automatic switching method of the energy storage power station provided by the embodiment of the invention, through the step S101, incoming line spare power automatic switching data of the energy storage power station are obtained, wherein the incoming line spare power automatic switching data comprise bus voltage data, bus frequency data, line switch information and incoming line state information, the step S102 is to judge whether the incoming line spare power automatic switching device meets the preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information, if yes, the incoming line spare power automatic switching device enters the charging state, the step S103 is executed, if not, the incoming line spare power automatic switching device does not enter the charging state, the step S101 is executed, the step S103 is executed, the starting mode and the corresponding protection mode of the incoming line spare power automatic switching device are selected when the incoming line spare power automatic switching device enters the charging state are executed, the step S104 is executed based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information, if so, controlling a spare power incoming line switch in the line switch information to perform a closing operation, executing the step S105, otherwise, returning to the step S101, judging whether the bus voltage data and the line switch information meet a preset fault rear acceleration condition or not, if so, determining that the incoming line spare power automatic switching operation of the energy storage power station fails, controlling the spare power incoming line switch to perform a tripping operation, returning to the step S101, and if not, recovering to be normal through voltage to determine that the incoming line spare power automatic switching operation of the energy storage power station succeeds The starting technical problem ensures the stable and reliable operation of the energy storage power station.
In a second embodiment, referring to fig. 2, fig. 2 is a flowchart of a method for incoming line backup automatic switching of an energy storage power station according to the present invention, including:
step S201, obtaining incoming line spare power automatic switching data of an energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
in the embodiment of the invention, incoming line spare power automatic switching data of an energy storage power station are obtained; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information.
Step S202, judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and step S203 is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and the step S201 is executed in a returning mode;
in the embodiment of the present invention, it is determined whether an incoming line backup automatic switching device meets a preset charging condition, if the incoming line backup automatic switching device meets the preset charging condition, the incoming line backup automatic switching device enters a charging state, step S3 is executed, and if the incoming line backup automatic switching device does not meet the preset charging condition, the incoming line backup automatic switching device does not enter the charging state, and step S201 is executed again.
In a specific implementation, the incoming spare power automatic switching device meets all charging conditions and continuously presets a first period T c1 Thereafter, the device enters a charging state. And if the incoming line spare power automatic switching device does not meet any charging condition, the incoming line spare power automatic switching device does not enter a charging state.
The charging conditions include: 1) The three-phase voltage of the two-section bus is greater than a preset first voltage threshold value U y (ii) a 2) Switching on the sectional switch; 3) One incoming line is mainly supplied (namely, the incoming line is in an operating state) and the other incoming line is standby (namely, the incoming line is in an operating state); 4) And the incoming line spare power automatic switching function is put into use.
Step S203, determining a voltage starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus voltage data and a preset phase voltage threshold;
it should be noted that, when the electrochemical energy storage power station and the adjacent load form an unintended island, the 10kV bus voltage and frequency are abnormal, so the bus voltage and frequency are used as criteria for unintended island formation.
Anti-islanding (prohibiting the occurrence of unintended islanding) refers to preventing the electrochemical energy storage power station from occurring and continuing to supply power to adjacent parts of the grid when the grid is under voltage loss.
The start-up mode comprises a voltage start-up mode and a frequency start-up mode; the voltage start-up mode comprises a low voltage start-up mode and a high voltage start-up mode; the frequency start-up mode includes a low frequency start-up mode and a high frequency start-up mode.
The protection mode comprises a voltage protection mode and a frequency protection mode; the voltage start-up mode comprises a low voltage protection mode and a high voltage protection mode; the frequency protection mode includes a low frequency protection mode and a high frequency protection mode.
In an alternative embodiment, the voltage start-up mode includes a low voltage start-up mode and a high voltage start-up mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the step S203 includes:
when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value, selecting the low-voltage starting mode;
and when the minimum phase voltage data in the bus voltage data is larger than the preset second phase voltage threshold, selecting the high-voltage starting mode.
In the embodiment of the invention, when the maximum phase voltage of any bus is lower than the preset first phase voltage threshold value U d1 When the standby power automatic switching device is started, the incoming standby power automatic switching device is started at low voltage; when the minimum phase voltage of any bus is higher than the preset second phase voltage threshold value U g1 And when the incoming line spare power automatic switching device is started, high voltage is applied to the incoming line spare power automatic switching device.
Step S204, determining a frequency starting mode when the incoming line spare power automatic switching device enters a charging state based on the size relation between the bus frequency data and a preset frequency threshold;
in an alternative embodiment, the frequency start-up mode includes a low frequency start-up mode and a high frequency start-up mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the step S204 includes:
when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold, selecting the low-frequency starting mode;
and when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold, selecting the high-frequency starting mode.
In the embodiment of the invention, when the minimum frequency data of any bus is greater than the preset first frequency threshold F d1 When the incoming line spare power automatic switching device is started at low frequency, when the maximum frequency data of any bus is smaller than a preset second frequency threshold value F g1 And when the incoming line spare power automatic switching device is started at high frequency.
Step S205, determining a corresponding voltage protection mode and a frequency protection mode based on the selected voltage starting mode and the selected frequency starting mode;
it should be noted that the protection mode includes a voltage protection mode corresponding to the voltage start mode and a frequency protection mode corresponding to the frequency start mode.
In the embodiment of the invention, the corresponding protection mode is selected according to the starting mode of the incoming line spare power automatic switching device.
In a specific implementation, the low-voltage protection means that after the low-voltage startup, the maximum phase voltage of any bus is in a preset second period T vd Is lower than a preset third phase voltage threshold value U d2 And the device sends a tripping command to control the tripping of the main power supply incoming line switch.
The high-voltage protection means that after the high voltage is started, the minimum phase voltage of any bus is in a preset third period T vg Is internally higher than a preset fourth phase voltage threshold value U g2 And the device sends a tripping command to control the tripping of the main power supply incoming line switch.
The low-frequency protection means that after the low-frequency starting, the frequency of any bus is in a preset fourth period T fd Is lower than a preset third frequency threshold F d2 And the device sends a tripping command to control the tripping of the main power supply incoming line switch.
The high-frequency protection means that after high-frequency starting, the frequency of any bus is in a preset fifth period T fg Is higher than a preset fourth frequency threshold F g2 And the device sends a tripping command to control the tripping of the main power supply incoming line switch.
Step S206, judging whether the energy storage power station meets preset fault isolation conditions; if yes, go to step S207; if not, returning to execute the step S201;
in the embodiment of the invention, when the energy storage power station is isolated from the power supply of the failed main power supply network, the energy storage power station is determined to meet the preset fault isolation condition; and when the energy storage power station is not isolated from the power supply of the failed main power supply network, determining that the energy storage power station does not meet the preset fault isolation condition.
Step S207, based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset power supply input condition of the power supply network by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing step S208; if not, returning to execute the step S201;
in the embodiment of the present invention, when the energy storage power station satisfies the preset power input condition of the backup power network, the backup power incoming line switch in the line switch information is controlled to perform a closing operation, and when the energy storage power station does not satisfy the preset power input condition of the backup power network, the step S201 is executed again.
The preset power supply condition of the standby power supply network is that in a preset sixth period, the main power supply incoming line switch which prevents island tripping is separated, the two sections of buses have no voltage, and the main power supply line switch has no current.
The position of the main power supply inlet wire switch can be judged by acquiring the position of the switch, and the voltage-free bus means that the three-phase voltage of the bus is lower than a voltage-free fixed value U w The main supply circuit switch is currentless, that is, the three-phase current of the main supply circuit switch is lower than the currentless fixed value I w 。
Step S208, judging whether the bus voltage data and the line switch information meet a preset post-fault acceleration condition; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to execute the step S201; and if not, determining that the inlet wire backup power automatic switching operation of the energy storage power station is successful through the voltage recovery.
In the embodiment of the invention, whether the acceleration condition after all faults is met is judged, if yes, a tripping command is sent immediately to control the incoming line switch to trip, and the spare power automatic switching fails; and if the acceleration condition after all faults is not met, the voltage of the 10kV bus with the voltage loss is confirmed to be normal, and the spare power automatic switching is successful.
In a specific implementation, a preset post-fault acceleration condition is used for judging whether a standby power incoming line switch is in fault, and the post-fault acceleration condition includes: 1) Any incoming line switch current is larger than fault current setting value I d (ii) a 2) Any bus voltage satisfies any composite voltage open condition. The composite voltage open condition comprises that the bus voltage is greater than the voltage setting value U d The bus zero sequence voltage is greater than the setting value U 0 The negative sequence voltage of the bus is greater than the setting value U 2 。
In the incoming line backup automatic switching method of the energy storage power station provided by the embodiment of the invention, the incoming line backup automatic switching data of the energy storage power station is obtained through the step S1, the incoming line backup automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information, the step S2 is to judge whether the incoming line backup automatic switching device meets the preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information, if yes, the incoming line backup automatic switching device enters the charging state, the step S3 is executed, if not, the incoming line backup automatic switching device does not enter the charging state, the step S1 is executed, the step S3 is executed, the starting mode and the corresponding protection mode of the incoming line backup automatic switching device entering the charging state are selected based on the bus voltage data and the frequency data, the step S4 is executed based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information, if so, controlling a spare power incoming line switch in the line switch information to perform a closing operation, executing the step S5, otherwise, returning to the step S1, judging whether the bus voltage data and the line switch information meet a preset fault rear acceleration condition or not, if so, determining that the incoming line spare power automatic switching operation of the energy storage power station fails, controlling the spare power incoming line switch to perform a tripping operation, returning to the step S1, otherwise, determining that the incoming line spare power automatic switching operation of the energy storage power station succeeds, the bus voltage data, the line switch information and the incoming line state information through voltage recovery, and judging whether the energy storage power station meets the preset spare power automatic switching condition or not, if yes, controlling a spare power supply inlet wire switch in the circuit switch information to perform a closing operation, executing a step S5, if not, returning to execute the step S1, and step S5, judging whether the bus voltage data and the circuit switch information meet preset post-fault acceleration conditions, if yes, determining that the inlet wire spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet wire switch to perform a tripping operation, and returning to execute the step S1, if not, determining that the inlet wire spare power automatic switching operation of the energy storage power station succeeds through voltage recovery, and solving the technical problem that an inlet wire spare power automatic switching device cannot be started correctly due to the fact that an island problem occurs in the existing inlet wire spare power automatic switching method, and guaranteeing stable and reliable operation of the energy storage power station.
Referring to fig. 3, fig. 3 is a block diagram of an incoming line backup automatic switching device of an energy storage power station according to an embodiment of the present invention, including:
the acquisition module 301 is used for acquiring incoming spare power automatic switching data of the energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
the charging module 302 is configured to determine whether the incoming line backup automatic switching device meets a preset charging condition according to the bus voltage data, the line switch information, and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and a selection module 303 is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and returns to the execution acquisition module 301;
a selecting module 303, configured to select a starting mode and a protection mode corresponding to the starting mode when the incoming line backup automatic switching device enters a charging state based on the bus voltage data and the bus frequency data;
the first judging module 304 is configured to judge whether the energy storage power station meets a preset spare power automatic switching condition based on the starting mode and the protection mode in combination with the bus voltage data, the line switch information, and the incoming line state information; if yes, controlling a standby incoming line switch in the line switch information to perform a closing operation, and executing a second judging module 305; if not, returning to the execution acquisition module 301;
a second determining module 305, configured to determine whether the bus voltage data and the line switch information meet a preset post-fault acceleration condition; if yes, determining that the incoming line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply incoming line switch to perform tripping operation, and returning to the execution acquisition module 301; and if not, determining that the inlet wire backup power automatic switching operation of the energy storage power station is successful through the voltage recovery.
In an alternative embodiment, the start-up mode includes a voltage start-up mode and a frequency start-up mode; the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the protection mode comprises a voltage protection mode corresponding to the voltage starting mode and a frequency protection mode corresponding to the frequency starting mode; the selection module 303 includes:
the voltage sub-module is used for determining a voltage starting mode when the inlet wire backup automatic switching device enters a charging state based on the size relation between the bus voltage data and a preset phase voltage threshold value;
the frequency sub-module is used for determining a frequency starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus frequency data and a preset frequency threshold;
and the protection sub-module is used for determining the corresponding voltage protection mode and the frequency protection mode based on the determined voltage starting mode and the frequency starting mode.
In an alternative embodiment, the voltage start-up mode includes a low voltage start-up mode and a high voltage start-up mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the voltage sub-module comprises:
the low-voltage submodule is used for selecting the low-voltage starting mode when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value;
and the high-voltage sub-module is used for selecting the high-voltage starting mode when the minimum phase voltage data in the bus voltage data is greater than the preset second phase voltage threshold value.
In an alternative embodiment, the frequency start-up mode includes a low frequency start-up mode and a high frequency start-up mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the frequency sub-module comprises:
the low-frequency submodule is used for selecting the low-frequency starting mode when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold;
and the high-frequency sub-module is used for selecting the high-frequency starting mode when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold.
In an optional embodiment, the preset spare power automatic switching condition comprises a fault isolation condition and a spare power supply network power supply switching condition; the first determining module 304 includes:
the isolation submodule is used for judging whether the energy storage power station meets the fault isolation condition; if yes, executing a investing submodule; if not, returning to the execution acquisition module 301;
the input submodule is used for judging whether the energy storage power station meets the power input condition of the standby power supply network or not based on the starting mode and the protection mode by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby incoming line switch in the line switch information to perform a closing operation, and executing a second judging module 305; if not, the process returns to the execution acquiring module 301.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the method and apparatus disclosed in the present invention can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned readable storage medium includes: a U-disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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 (6)

1. An incoming spare power automatic switching method of an energy storage power station is characterized by comprising the following steps:
the method comprises the following steps of S1, obtaining incoming line spare power automatic switching data of an energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
s2, judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and the step S3 is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and the step S1 is executed in a returning mode;
s3, selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters a charging state based on the bus voltage data and the bus frequency data; the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the protection mode comprises a voltage protection mode corresponding to the voltage starting mode and a frequency protection mode corresponding to the frequency starting mode;
s4, based on the starting mode and the protection mode, judging whether the energy storage power station meets a preset spare power automatic switching condition or not by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing the step S5; if not, returning to execute the step S1; the preset spare power automatic switching conditions comprise fault isolation conditions and spare power supply network power supply switching conditions;
s5, judging whether the bus voltage data and the line switch information meet a preset post-fault acceleration condition or not; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to execute the step S1; if not, determining that the inlet wire backup power automatic switching operation of the energy storage power station is successful through the voltage recovery;
the step S3 includes:
step S31, determining a voltage starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus voltage data and a preset phase voltage threshold;
step S32, determining a frequency starting mode when the incoming line spare power automatic switching device enters a charging state based on the magnitude relation between the bus frequency data and a preset frequency threshold;
step S33, determining the corresponding voltage protection mode and the frequency protection mode based on the determined voltage starting mode and the frequency starting mode;
the step S4 includes:
step S41, judging whether the energy storage power station meets the fault isolation condition; if yes, go to step S42; if not, returning to execute the step S1;
step S42, based on the starting mode and the protection mode, combining the bus voltage data, the line switch information and the incoming line state information to judge whether the energy storage power station meets the power supply input condition of the standby power supply network; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing the step S5; if not, returning to execute the step S1.
2. The incoming line backup power automatic switching method of an energy storage power station of claim 1 characterized in that said voltage startup mode comprises a low voltage startup mode and a high voltage startup mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the step S31 includes:
when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value, selecting the low-voltage starting mode;
and when the minimum phase voltage data in the bus voltage data is larger than the preset second phase voltage threshold, selecting the high-voltage starting mode.
3. The incoming line spare power automatic switching method of an energy storage power station as claimed in claim 1, characterized in that the frequency starting mode comprises a low frequency starting mode and a high frequency starting mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the step S32 includes:
when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold, selecting the low-frequency starting mode;
and when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold, selecting the high-frequency starting mode.
4. The utility model provides an inlet wire spare power automatic switching device of energy storage power station which characterized in that includes:
the acquisition module is used for acquiring incoming spare power automatic switching data of the energy storage power station; the incoming line spare power automatic switching data comprises bus voltage data, bus frequency data, line switch information and incoming line state information;
the charging module is used for judging whether the incoming line spare power automatic switching device meets a preset charging condition or not according to the bus voltage data, the line switch information and the incoming line state information; if yes, the incoming line spare power automatic switching device enters a charging state, and a selection module is executed; if not, the incoming line spare power automatic switching device does not enter a charging state, and returns to the execution acquisition module;
the selection module is used for selecting a starting mode and a corresponding protection mode when the incoming line spare power automatic switching device enters a charging state based on the bus voltage data and the bus frequency data; the start-up mode comprises a voltage start-up mode and a frequency start-up mode; the protection mode comprises a voltage protection mode corresponding to the voltage starting mode and a frequency protection mode corresponding to the frequency starting mode;
the first judgment module is used for judging whether the energy storage power station meets a preset spare power automatic switching condition or not based on the starting mode and the protection mode by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing a second judgment module; if not, returning to the execution acquisition module; the preset spare power automatic switching conditions comprise fault isolation conditions and spare power supply network power supply switching conditions;
the second judgment module is used for judging whether the bus voltage data and the line switch information meet the preset post-fault acceleration condition or not; if yes, determining that the inlet line spare power automatic switching operation of the energy storage power station fails, controlling the spare power supply inlet line switch to perform tripping operation, and returning to the execution acquisition module; if not, determining that the inlet wire spare power automatic switching operation of the energy storage power station is successful through voltage recovery;
the selection module comprises:
the voltage sub-module is used for determining a voltage starting mode when the incoming line backup automatic switching device enters a charging state based on the magnitude relation between the bus voltage data and a preset phase voltage threshold value;
the frequency sub-module is used for determining a frequency starting mode when the incoming line spare power automatic switching device enters a charging state based on the size relation between the bus frequency data and a preset frequency threshold;
the protection sub-module is used for determining the corresponding voltage protection mode and the frequency protection mode based on the determined voltage starting mode and the frequency starting mode;
the first judging module comprises:
the isolation submodule is used for judging whether the energy storage power station meets the fault isolation condition; if yes, executing a investing submodule; if not, returning to the execution acquisition module;
the input submodule is used for judging whether the energy storage power station meets the power input condition of the standby power supply network or not based on the starting mode and the protection mode by combining the bus voltage data, the line switch information and the incoming line state information; if yes, controlling a standby power incoming line switch in the line switch information to perform closing operation, and executing a second judgment module; if not, returning to the execution acquisition module.
5. The incoming line backup automatic switching device of an energy storage power station of claim 4 characterized in that said voltage startup mode comprises a low voltage startup mode and a high voltage startup mode; the preset phase voltage threshold comprises a preset first phase voltage threshold and a preset second phase voltage threshold; the voltage sub-module comprises:
the low-voltage submodule is used for selecting the low-voltage starting mode when the maximum phase voltage data in the bus voltage data is smaller than the preset first phase voltage threshold value;
and the high-voltage sub-module is used for selecting the high-voltage starting mode when the minimum phase voltage data in the bus voltage data is greater than the preset second phase voltage threshold value.
6. The incoming line backup automatic switching device of an energy storage power station of claim 4, characterized in that said frequency startup mode comprises a low frequency startup mode and a high frequency startup mode; the preset phase voltage threshold comprises a preset first frequency threshold and a preset second frequency threshold; the frequency sub-module comprises:
the low-frequency submodule is used for selecting the low-frequency starting mode when the maximum frequency data in the bus frequency data is smaller than the preset first frequency threshold;
and the high-frequency sub-module is used for selecting the high-frequency starting mode when the minimum frequency data in the bus frequency data is greater than the preset second frequency threshold.
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