CN113471950A - Storage battery pack fault self-healing system and method for power plant station - Google Patents
Storage battery pack fault self-healing system and method for power plant station Download PDFInfo
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- CN113471950A CN113471950A CN202110885824.1A CN202110885824A CN113471950A CN 113471950 A CN113471950 A CN 113471950A CN 202110885824 A CN202110885824 A CN 202110885824A CN 113471950 A CN113471950 A CN 113471950A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/084—Three-wire systems; Systems having more than three wires for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J1/086—Three-wire systems; Systems having more than three wires 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 or loads and source or sources when the main path fails
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J9/061—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 DC powered loads
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a storage battery pack fault self-healing system and a storage battery pack fault self-healing method for a power plant station, wherein the system comprises a valve-controlled lead-acid storage battery pack, a segmented capacity converter, a lithium battery pack, an on-line monitoring device of the valve-controlled lead-acid storage battery pack and a self-healing system control device; the valve-controlled lead-acid storage battery pack is divided into a plurality of sections, and each section comprises a plurality of valve-controlled lead-acid storage batteries; each valve-controlled lead-acid storage battery section is provided with 1 segmented capacity converter, and the segmented capacity converters are connected with the lithium battery pack in parallel; the lithium battery pack is connected to the direct current bus through a voltage reduction silicon chain; the valve-controlled lead-acid storage battery on-line monitoring device is connected with the valve-controlled lead-acid storage battery. When the valve-controlled lead-acid storage battery pack has faults such as an open circuit in the storage battery, the invention can automatically and quickly isolate the failed storage battery while the lithium iron phosphate storage battery pack keeps continuous power supply of a direct-current power supply, recover the power supply of the rest batteries in the valve-controlled lead-acid storage battery pack and realize self fault repair of the storage battery pack and fault healing of a direct-current power supply system.
Description
Technical Field
The invention relates to the technical field of power generation, transmission and transformation, in particular to a storage battery pack fault self-healing system and method for a power station.
Background
The direct-current power supply system of the power station undertakes low-voltage direct-current power supply tasks of primary and secondary equipment in a power plant, a transformer substation and a converter station, and is an auxiliary system during normal operation of the power station and a security facility under abnormal conditions. With the expansion of the scale of a power grid, the improvement of the operating voltage level and the continuous improvement of the comprehensive automation and intelligent technical level of a power system, the direct current load of a power plant station is increased, the types of auxiliary equipment and devices are increased, and part of important direct current loads needing continuous power supply provide higher requirements for the reliability and safety of power supply of a direct current power supply system. The fixedly installed valve-controlled lead-acid storage battery pack is core equipment of a station direct-current power supply system, although the storage battery pack is in a standby state at ordinary times, the direct-current power supply meeting requirements can be continuously provided for the power station direct-current power supply system under the condition of alternating current power loss or other accident states, and the storage battery pack becomes a unique energy supplier of the power station accident load. When a large impact current occurs, the storage battery pack provides the impact current for the load due to the protection characteristic of the charging device.
And according to the data searched by part of the literature data, the lowest availability of the charging device, the switch and the storage battery pack in the power plant station direct-current power supply system equipment is obtained through preliminary calculation. The change of the fault rate and the repair rate of the charging device, the storage battery pack and the load side switch has no influence on the availability of the power plant station direct-current power supply system, and the change of the fault rate and the repair rate of the storage battery pack has the greatest influence on the reliability index of the whole power plant station direct-current power supply system, so that the power supply reliability of the power plant station direct-current power supply system is determined by the actual state of the valve-controlled lead-acid storage battery pack no matter in an alternating-current power supply interruption state or an accident state or a normal power supply state.
In recent years, an on-line monitoring system for a valve-controlled lead-acid storage battery pack of a power plant is provided, important parameters such as the voltage of a single storage battery, the voltage of the battery pack, the internal resistance of the single storage battery, the internal temperature of the battery and the like are monitored on line, once the abnormality or abnormal change trend of a certain storage battery is found, an alarm is immediately sent to inform operation and maintenance personnel to process the storage battery in time, and the safety and reliability of the system are far from sufficient for power production completed in one step. The storage battery pack of the power plant station direct-current power supply is formed by connecting dozens or more than one hundred of single storage batteries in series, and when any storage battery fails, the storage battery pack formed by the whole series connection cannot normally supply power, for example, when the alternating-current power supply is interrupted due to a power grid accident or a power plant station system fault, the internal open circuit fault of one valve-controlled lead-acid storage battery occurs, the power supply of the power plant station direct-current power supply is interrupted, the accident of the power plant station is directly expanded, and even the accident of power grid system cascading is generated.
The internal open-circuit fault of the valve-controlled lead-acid storage battery is very difficult to predict in the existing floating charge operation mode of a power plant station, effective prevention and treatment measures are lacked, the internal open-circuit fault of the storage battery is sudden, so that people cannot defend the internal open-circuit fault, and a plurality of internal open-circuit faults of the storage battery can appear in each year in a transformer substation governed by one provincial electric power company, so that the internal open-circuit fault becomes a chronic disease which seriously puzzles maintainers and managers for a long time. Therefore, when a fault occurs, such as an open circuit inside the valve-controlled lead-acid storage battery, which can cause the storage battery to lose the power supply capacity, not only an alarm is needed, but also a method and a measure are needed to enable the storage battery to continuously supply power for important loads.
Disclosure of Invention
The invention aims to provide a storage battery pack fault self-healing system and a method for a power plant station, wherein the system is a valve-controlled lead-acid storage battery pack for a direct-current power supply system of the power plant station, when faults such as open circuit and the like occur in individual storage batteries, a direct-current power supply is kept to continuously supply power, fault batteries are automatically and rapidly isolated, the capacity of the residual batteries of the storage battery pack is used for continuously supplying power to a direct-current bus, and the self-fault repair of the storage battery pack and the fault healing of a direct-current power supply system are realized until the continuous power supply function of an emergency power supply is completed.
The invention combines a valve-controlled lead-acid storage battery pack of a direct-current power supply system of a power plant with a special small-capacity non-floating-charging lithium iron phosphate storage battery system through a segmented capacity converter of the valve-controlled lead-acid storage battery pack, and simultaneously utilizes an existing or newly-configured on-line monitoring device of the valve-controlled lead-acid storage battery pack to form a brand-new storage battery pack fault self-healing system. When the valve-controlled lead-acid storage battery pack has faults such as open circuit inside the storage battery, the fault storage battery can be automatically and rapidly isolated while the small-capacity lithium iron phosphate storage battery pack keeps continuous power supply of a direct-current power supply, the power supply of the rest batteries in the storage battery pack is recovered, the self fault repair of the storage battery pack and the fault healing of a direct-current power supply system are realized, and the continuous power supply function of an accident safety power supply is completed.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a storage battery pack fault self-healing system for a power plant, which comprises a valve-controlled lead-acid storage battery pack, wherein the valve-controlled lead-acid storage battery pack is connected to a direct-current bus of a direct-current power supply system of the power plant, and is provided with a charging device; the system also comprises a segmented capacity converter, a non-floating lithium battery system (lithium battery pack for short), a valve-controlled lead-acid battery pack online monitoring device and a self-healing system control device;
the valve-controlled lead-acid storage battery pack is divided into a plurality of sections, and each section comprises a plurality of valve-controlled lead-acid storage batteries;
each valve-controlled lead-acid storage battery segment is provided with 1 segmented capacity converter which is connected with a lithium battery pack in parallel; the lithium battery pack is connected to the direct current bus through a voltage reduction silicon chain;
the valve-regulated lead-acid storage battery pack online monitoring device is connected with the valve-regulated lead-acid storage battery pack and is used for monitoring the storage battery state of the valve-regulated lead-acid storage battery pack, including the single battery fault condition;
the self-healing system control device is connected with the valve control lead-acid storage battery pack on-line monitoring device, the segmented capacity converter and the lithium battery pack, the valve control lead-acid storage battery pack on-line monitoring device is used for monitoring that the valve control lead-acid storage battery pack has storage battery faults, the fault storage battery is determined through the voltage of a storage battery monomer and the temperature parameter inside the battery, when a direct-current power supply of a power plant station is in abnormal states such as system accidents or alternating current interruption, the lithium battery pack continuously supplies power for a direct-current bus at intervals, the uninterrupted continuous power supply of direct-current loads is ensured, the segmented capacity converter of the fault-free storage battery pack is controlled and started, the normal storage battery pack continues to supply power for the direct-current bus, and the power supply function of the valve control lead-acid storage battery pack is recovered. Meanwhile, the self-healing system control device can supplement the discharged capacity for the lithium battery pack according to the real-time running state so as to prepare the capacity of the lithium battery pack. The fault self-healing of the storage battery pack of the direct-current power supply of the power station is realized, and meanwhile, operation and maintenance personnel can quickly replace and maintain the fault storage battery.
Furthermore, the lithium battery pack voltage reducing device further comprises a set of voltage reducing silicon chains with open circuit prevention measures, the voltage reducing silicon chains are arranged between the lithium battery pack and the direct current bus, one end of each voltage reducing silicon chain is connected with the lithium battery pack, and the other end of each voltage reducing silicon chain is connected with the direct current bus. According to the invention, the lithium battery pack can transmit power to the direct current bus through the voltage reduction silicon chain, but the direct current bus does not charge the lithium battery pack normally under the action of the one-way conduction characteristic of the silicon chain.
Further, the lithium battery pack is provided with a supplementary charging device and a battery management system BMS, and the supplementary charging device and the battery management system BMS are combined to perform maintenance management on the low-capacity lithium battery pack.
Further, the valve-regulated lead-acid battery pack is generally uniformly divided into 4 sections, each section including an equal number of valve-regulated lead-acid batteries.
Further, the nominal voltage of the power plant station direct-current power supply system is basically divided into 220V and 110V, and the nominal voltage of the valve-regulated lead-acid storage battery basically comprises 2V, 6V and 12V;
when the system nominal voltage of a direct-current power supply of an electric power plant is 220V, the number of valve-controlled lead-acid storage batteries corresponding to the nominal voltage of 2V in a valve-controlled lead-acid storage battery pack is generally 104, and each section comprises 26 valve-controlled lead-acid storage batteries; when the nominal voltage of the system is 110V, the number of the valve-regulated lead-acid storage batteries corresponding to the nominal voltage of 2V in the valve-regulated lead-acid storage battery pack is generally 52, and each section comprises 13 valve-regulated lead-acid storage batteries.
Further, the storage battery of the lithium battery pack is a lithium iron phosphate storage battery pack.
In a second aspect, the present invention further provides a fault self-healing method for a storage battery pack for a power plant station, where the method is applied to the fault self-healing system for the storage battery pack for the power plant station, and the method includes:
when the valve-controlled lead-acid storage battery pack normally operates:
all storage batteries in the valve-controlled lead-acid storage battery pack are connected to the direct-current bus in a series connection mode under the monitoring of the valve-controlled lead-acid storage battery pack on-line monitoring device, and the charging device supplies power to the direct-current bus in a floating charging operation mode and also performs supplementary charging on the valve-controlled lead-acid storage battery pack so as to make up for capacity loss of the lead-acid storage batteries caused by self-discharge;
when the charging device stops working due to interruption of the alternating current power supply or other reasons, the valve-controlled lead-acid storage battery pack keeps the series connection mode to uninterruptedly supply power to the direct current bus so as to ensure the power consumption of a direct current load;
when the valve-controlled lead-acid storage battery pack has storage battery faults:
when the valve-controlled lead-acid storage battery pack has a fault, such as an open circuit fault in any one valve-controlled lead-acid storage battery, and the charging device stops working due to the interruption of an alternating current power supply or other reasons, the power supply to the direct current bus is interrupted due to the mode formed by the series connection of the storage battery packs, and the power loss (power failure) of the direct current bus and the direct current load is directly caused. At the moment, the valve-controlled lead-acid storage battery pack on-line monitoring device can find a fault and send an alarm signal, but the fault can be processed only by manual work on site. However, when the storage battery pack fault self-healing system for the power station is configured, firstly, the low-capacity non-floating lithium battery pack supplies power to the direct-current bus uninterruptedly and continuously in a seamless connection manner so as to ensure the continuous power utilization of the direct-current load; then, according to the position of a fault storage battery detected by an online monitoring device of a valve-controlled lead-acid storage battery pack, starting a segmented capacity converter of a non-fault storage battery section, supplying power to a direct-current bus through a lithium battery pack in a parallel connection mode to ensure the power consumption of a direct-current load, and simultaneously supplementing the discharged capacity for the lithium battery pack by a self-healing system control device according to a real-time running condition so as to prepare the capacity of the lithium battery pack, so that the condition that the protection function (voltage reduction and current limitation) of the battery capacity converter is started due to the impact load is avoided, the voltage of the direct-current bus falls, the power supply interruption of the direct-current load is caused, and the station accident expansion or the new station accident possibly caused is avoided;
the fault self-healing working steps of the valve-controlled lead-acid storage battery pack are as follows:
firstly, important parameters such as single voltage, group voltage, single internal resistance, battery internal temperature and the like of a storage battery of a valve-controlled lead-acid storage battery pack are monitored on line, and a fault storage battery is accurately judged by a rapid discrimination technology according to monitored parameter data;
secondly, by adopting the rapid isolation and capacity conversion technology of the fault battery, when the alternating current is interrupted or the charging device stops working and the voltage of the direct current bus falls by the fault of the valve-controlled lead-acid storage battery pack to exceed a set value, the lithium battery pack supplies power to the direct current bus uninterruptedly and continuously to ensure the uninterrupted continuous power supply to the direct current load, and meanwhile, according to the judgment of the monitoring device of the storage battery pack on the fault battery, the self-healing system control device enables the non-fault storage battery in the valve-controlled storage battery pack to recover the discharge, thereby ensuring the capacity supply of the valve-controlled lead-acid storage battery pack of the direct current power supply system and realizing the self-healing function of the fault storage battery pack of the direct current power supply system of the power plant.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the lithium battery pack is provided with the special supplementary charging device, the voltage reduction silicon chain is used for realizing unidirectional conductivity, the bus voltage is cut off to charge the lithium battery pack, uninterrupted power supply can be realized after the bus voltage is reduced, the supplementary charging device carries out supplementary charging in a limited way under the control of the BMS, the lithium battery pack is always in a non-floating charging state, and the safety and reliability are greatly improved.
2. The invention is provided with a plurality of sections of valve-controlled lead-acid storage batteries, and each section is provided with a sectional capacity converter, thereby avoiding the embarrassing state that the power supply is interrupted again because any one of the sections fails; in the prior art, the battery modules are usually connected by one DC/DC converter, the voltage of a direct current bus fluctuates in the conversion process, and if only one DC/DC converter fails, the power supply is interrupted again.
3. When the valve-controlled lead-acid storage battery pack fails, the direct-current bus loses power, and before the segmented capacity converter normally supplies power, the direct-current bus is directly supplied with power continuously due to the lithium battery pack, so that the interruption of direct-current power supply is avoided.
4. The segmented capacity converter is connected with the lithium battery pack in parallel, so that the lithium battery pack can provide enough load current and short-circuit current required by the action of the protection device no matter the load current is increased or short-circuit fault occurs, and the faults of protective shutdown of the segmented capacity converter, power failure of a direct-current bus and the like cannot occur.
5. The invention relates to a fault self-healing technology of a direct-current power supply storage battery pack, which can automatically and rapidly isolate a fault battery while keeping the continuous power supply of a direct-current power supply when an open circuit fault occurs inside individual batteries of storage batteries connected in series with the storage battery pack, continuously supply power to a direct-current bus by using the capacity of the residual batteries of the storage battery pack, realize the self-fault repair of the storage battery pack and the fault healing of a direct-current power supply system until the fault self-healing technology finishes the continuous power supply function of an accident safety power supply.
6. On the premise of keeping the main wiring and the running mode of the original station direct-current power supply system unchanged, the invention uses partial functions of the configured valve-controlled lead-acid storage battery pack online monitoring device in a bypass mode, combines a segmented capacity converter and a non-floating-charging type small-capacity lithium iron storage battery pack, forms a power station direct-current power supply storage battery pack fault self-healing system, solves the problem of direct-current bus voltage reduction caused by self protection when the DC/DC converter outputs impact current, and improves the power supply reliability and the safe running level of the direct-current power supply system for the power station.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a storage battery pack fault self-healing system for a power station according to the present invention.
Fig. 2 is a schematic structural diagram of a storage battery pack fault self-healing system for a power station according to the present invention.
Fig. 3 is a wiring diagram of a storage battery pack fault self-healing system for a power station according to an embodiment of the present invention.
Reference numbers and corresponding part names:
1-a direct current load; 2-a charging device; 3-valve-controlled lead-acid storage battery; 4-a segmented capacity converter; 5-a silicon chain for reducing blood pressure; 6-lithium battery pack; 7-a supplementary charging device; 8-direct current bus of the direct current power supply system.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 to fig. 3, the storage battery pack fault self-healing system for the power plant of the present invention includes a valve-controlled lead-acid storage battery pack 3, wherein the valve-controlled lead-acid storage battery pack 3 is connected to a dc bus 8 of a dc power supply system of the power plant, and the valve-controlled lead-acid storage battery pack 3 is equipped with a charging device 2; the direct current bus 8 can be hung on the direct current load 1; the system also comprises a segmented capacity converter 4, a lithium battery pack 6, a valve-controlled lead-acid storage battery pack online monitoring device and a self-healing system control device;
the valve-controlled lead-acid storage battery pack 3 is divided into a plurality of sections, and each section comprises a plurality of valve-controlled lead-acid storage batteries;
each valve-controlled lead-acid storage battery segment is provided with 1 segmented capacity converter 4, and the segmented capacity converters 4 are directly connected with a low-capacity lithium battery pack 6 in parallel; the lithium battery pack 6 is connected to the direct current bus 8 through a voltage reduction silicon chain;
the valve-controlled lead-acid storage battery pack online monitoring device is connected with the valve-controlled lead-acid storage battery pack 3 and is used for monitoring the battery fault condition of the valve-controlled lead-acid storage battery pack 3;
the self-healing system control device is connected with the valve-controlled lead-acid storage battery pack online monitoring device, the segmented capacity converter 4 and the lithium battery pack 6, and is used for automatically and continuously supplying power to the direct current bus 8 through the voltage reduction silicon chain at intervals when the valve-controlled lead-acid storage battery pack online monitoring device monitors that the valve-controlled lead-acid storage battery pack 3 has an open-circuit battery fault, so that uninterrupted continuous power supply of a direct current load is ensured when a direct current power supply of an electric power plant is in an abnormal state such as a system accident or alternating current interruption; meanwhile, the on-line monitoring device of the valve-controlled lead-acid storage battery pack determines a fault storage battery through important parameters such as the voltage of a storage battery monomer and the internal temperature of the battery, the segmented capacity converter 4 is controlled to be started, the normal storage battery continues to supply power for a direct-current bus, the power supply function of the storage battery pack is recovered, meanwhile, the self-healing system control device can supplement discharged capacity for the lithium battery pack 6 according to real-time running conditions, the capacity of the lithium battery pack 6 is prepared, the fault self-healing of the direct-current power supply storage battery pack of the power plant is realized, and meanwhile, operation and maintenance personnel can perform quick replacement maintenance on the fault storage battery.
For further explanation of the present embodiment, the lithium battery pack further includes a set of voltage-reducing silicon chains 5 with an open-circuit prevention measure, the voltage-reducing silicon chains 5 are disposed between the lithium battery pack 6 and the dc bus 8, one end of the voltage-reducing silicon chain 5 is connected to the lithium battery pack 6, and the other end of the voltage-reducing silicon chain is connected to the dc bus 8. According to the invention, the voltage reduction silicon chain 5 is adopted, so that the lithium battery pack 6 can supply power to the direct current bus 8, but the direct current bus 8 is not charged to the lithium battery pack 6 under the action of the one-way conduction characteristic of the silicon chain.
For further explanation of the present embodiment, the lithium battery pack 6 is equipped with a supplementary charging device 7 and a battery management system BMS, the supplementary charging device 7 is a supplementary charging device 7 of a non-float-charged lithium battery pack 6, and the small-capacity lithium battery pack 6 is maintained and managed by combining the supplementary charging device 7 and the battery management system BMS.
For further explanation of the present embodiment, for safety and reliability, the valve-regulated lead-acid battery 3 is uniformly divided into 4 sections, which may be divided into more sections, and is beneficial to isolating a plurality of faulty batteries, but the boost voltage of the segmented capacity converter 4 will be increased, the number and specification of the assembled batteries will be increased, the interchangeability is poor, the number of spare batteries is large, the cost is increased, and the probability that 2 or more faulty batteries occur simultaneously in a group of batteries is too small; and simultaneously, in order to take the nominal voltages of 220V and 110V power plant station direct current power supply systems into consideration, each valve-controlled lead-acid storage battery pack 3 comprises the same number of storage batteries, so that the valve-controlled lead-acid storage battery pack 3 is not easily divided into 3 sections.
When in implementation: the invention combines a valve-controlled lead-acid storage battery pack 3 of a direct-current power supply system of a power station with a special small-capacity lithium iron phosphate storage battery pack 6 through a sectional capacity converter 4 (which can be a bidirectional DC/DC converter) of the valve-controlled lead-acid storage battery pack 3, and simultaneously utilizes an existing or newly-configured online monitoring device of the valve-controlled lead-acid storage battery pack 3 to form a brand-new storage battery pack fault self-healing system. When the valve-controlled lead-acid storage battery pack 3 has faults such as open circuit inside the storage battery, the fault storage battery can be automatically and rapidly isolated while the small-capacity lithium iron phosphate storage battery pack 6 keeps continuous power supply of the direct-current power supply, the power supply of the rest batteries in the storage battery pack is recovered, the self fault repair of the storage battery pack and the fault healing of the direct-current power supply system are realized, and the continuous power supply function of the emergency power supply is completed.
Based on the nominal voltage of the power station direct-current power supply system, the power station direct-current power supply system is basically divided into 220V and 110V, the 110V system is few, meanwhile, the nominal voltage of the valve-controlled lead-acid storage battery is basically 2V, 6V and 12V, and the power station basically uses the 2V storage battery. Taking 2V storage batteries as an example, the nominal voltage of a power plant station direct-current power supply system 220V corresponds to 104 storage batteries in the valve-controlled lead-acid storage battery pack 3, the nominal voltage of the power plant station direct-current power supply system 110V corresponds to 52 storage batteries in the valve-controlled lead-acid storage battery pack 3, the valve-controlled lead-acid storage battery pack 3 is generally divided into 4 sections (which can be divided into more sections and is beneficial to isolating a plurality of fault storage batteries, but the boosting voltage of the segmented capacity converter 4 is increased, the assembling quantity and specification are increased, the interchangeability is poor, a plurality of spare products are obtained, the cost is increased greatly, the probability that 2 or more fault storage batteries simultaneously appear in one group of storage batteries is too small), the number of the storage batteries in each section of the valve-controlled lead-acid storage battery pack 3 is 26 or 13, 1 segmented capacity converter 4 is configured in each section and is directly connected in parallel with the small-capacity lithium iron storage battery pack 6, sometimes the maintenance or the need of the small-capacity storage battery pack 6, two or more groups of small-capacity lithium iron storage battery packs are used in parallel. In order to isolate the lithium iron storage battery 6 from the floating charging voltage from the direct current bus, a group of voltage reduction silicon chains 5 are added between the direct current bus 8 and the lithium iron storage battery 6, so that the lithium iron storage battery 6 can supply power to the direct current bus 8, but the direct current bus 8 is acted by the unidirectional conduction characteristic of the silicon chains and does not charge the lithium iron storage battery 6; the lithium iron storage battery pack 6 is provided with a supplementary charging device 7 and a battery management system BMS, which form a non-floating charging lithium battery pack system for maintaining and managing the small-capacity lithium iron storage battery pack 6, and the storage battery pack fault self-healing system for the power plant is formed as shown in figures 1, 2 and 3.
When the valve-controlled lead-acid storage battery pack 3 of the direct-current power supply system of the power plant station is normal, the lithium iron storage battery pack is in a non-offline non-floating charging hot standby state. When the alternating current interruption or the charging device 2 stops working and the voltage drop amplitude of the direct current bus 8 exceeds a set value due to the fault of the valve-controlled lead-acid storage battery pack 3, the lithium iron storage battery pack in hot standby continuously supplies power to the direct current bus at intervals (0ms) to ensure that the direct current load is continuously supplied with power uninterruptedly, meanwhile, the valve-controlled lead-acid storage battery on-line monitoring device determines a fault battery through important parameters such as monomer voltage, battery internal temperature and the like, starts the segmented capacity converter 4, enables the normal storage battery to continuously supply power to the direct current bus, recovers the power supply function of the storage battery pack, achieves the self-recovery of the fault of the direct current power storage battery pack of the power plant, and meanwhile, operation and maintenance personnel can rapidly replace and maintain the fault storage battery.
Compared with the prior art, the innovation points of the invention comprise the following points:
(1) the lithium battery pack is provided with the special supplementary charging device, the bus voltage is cut off by utilizing the voltage reduction silicon chain unidirectional conductivity, the uninterrupted power supply can be realized after the bus voltage is reduced, the supplementary charging device carries out supplementary charging in a limited way under the control of the BMS, so that the lithium battery pack is always in a non-floating charging state, and the safety and reliability are greatly improved;
(2) the multi-section lead-acid storage battery pack is provided with the section capacity converters, so that the embarrassing state that the power supply is interrupted again due to the fault of any one battery is avoided; in the prior art, the battery modules are usually connected by one DC/DC converter, the voltage of a direct current bus fluctuates in the conversion process, and if only one DC/DC converter fails, the power supply is interrupted again.
(3) When the valve-controlled lead-acid storage battery pack fails, the direct-current bus loses power, and before the segmented capacity converter normally supplies power, the direct-current bus is directly supplied with power continuously due to the lithium battery pack, so that the interruption of direct-current power supply is avoided;
(4) the segmented capacity converter is connected with the lithium battery pack in parallel, so that the lithium battery pack can provide enough load current and short-circuit current required by the action of the protection device no matter the load current is increased or short-circuit fault occurs, and the faults of protective shutdown of the segmented capacity converter, power failure of a direct-current bus and the like cannot occur.
Example 2
As shown in fig. 1 to fig. 3, the difference between the present embodiment and embodiment 1 is that the present embodiment provides a method for self-healing of a fault of a storage battery pack for an electric power plant station, where the method is applied to a system for self-healing of a fault of a storage battery pack for an electric power plant station in embodiment 1, and the method includes:
when the valve-controlled lead-acid storage battery pack normally operates:
all storage batteries in the valve-controlled lead-acid storage battery pack 3 are connected to a direct-current bus in a series connection mode under the monitoring of an on-line monitoring device of the valve-controlled lead-acid storage battery pack, and the charging device 2 supplies power to the direct-current bus in a floating charging operation mode and also performs complementary charging on the valve-controlled lead-acid storage battery pack 3 so as to make up for capacity loss of the storage batteries caused by self-discharge;
when the charging device 2 stops working due to interruption of the alternating current power supply or other reasons, the valve-controlled lead-acid storage battery pack 3 keeps the series connection mode to uninterruptedly supply power to the direct current bus so as to ensure the power consumption of a direct current load;
when the valve-controlled lead-acid storage battery pack has storage battery faults:
when a fault occurs in a specific storage battery of the valve-controlled lead-acid storage battery pack 3, such as an open circuit fault in any storage battery, and the charging device 2 stops working due to the interruption of an alternating current power supply or other reasons, the power supply to the direct current bus is interrupted due to the mode formed by the series connection of the storage battery packs, so that the power loss (power failure) of the direct current bus and the direct current load is directly caused. At the moment, the valve-controlled lead-acid storage battery pack on-line monitoring device can find a fault and send an alarm signal, but the fault can be processed only by manual work on site. However, when the storage battery pack fault self-healing system for the power station is configured, firstly, the small-capacity non-floating lithium battery pack 6 supplies power to the direct current bus 8 seamlessly and uninterruptedly in a seamless connection manner so as to ensure the power consumption of a direct current load; then, according to the position of a fault storage battery detected by an online monitoring device of a valve-controlled lead-acid storage battery pack, starting a segmented capacity converter 4 of a non-fault storage battery section, supplying power to a direct-current bus 8 through a lithium battery pack 6 in a parallel connection mode to ensure the power consumption of a direct-current load, and simultaneously, a self-healing system control device can supplement discharged capacity for the lithium battery pack 6 according to a real-time running condition to prepare the capacity of the lithium battery pack 6, so that the phenomenon that the protection function (voltage reduction and current limitation) of a battery capacity converter is started due to impact load is avoided, the voltage of the direct-current bus 8 falls, the power supply interruption of the direct-current load is caused, and a station accident is expanded or a new station accident is caused possibly;
the fault self-healing working steps of the valve-controlled lead-acid storage battery pack are as follows:
firstly, important parameters such as single voltage, group voltage, single internal resistance, battery internal temperature and the like of a storage battery of a valve-controlled lead-acid storage battery pack are monitored on line, and a fault storage battery is accurately judged by a rapid discrimination technology according to monitored parameter data;
secondly, by adopting the rapid isolation and capacity conversion technology of the fault battery, when the alternating current interruption or the charging device stops working and the voltage of the direct current bus falls beyond a set value due to the fault of the valve-controlled lead-acid storage battery pack 3, the lithium battery pack 6 supplies power to the direct current bus 8 in a seamless connection mode to ensure that the direct current load is supplied with power uninterruptedly and continuously, meanwhile, according to the judgment of the monitoring device of the storage battery pack on the fault battery, the self-healing system control device enables the non-fault storage battery in the valve-controlled lead-acid storage battery pack to recover discharging, the capacity supply of the valve-controlled lead-acid storage battery pack of the direct current power supply system is ensured, and the self-healing function of the fault storage battery pack of the direct current power supply of the power plant is realized.
The invention relates to a fault self-healing technology of a direct-current power supply storage battery pack, which can automatically and quickly isolate a fault battery when a storage battery connected in series with a valve-controlled lead-acid storage battery pack has a fault of a single battery, and continuously supply power to a direct-current bus by using the capacity of the residual battery of the valve-controlled lead-acid storage battery pack, thereby realizing the self fault healing of the valve-controlled lead-acid storage battery pack and the fault healing of a direct-current power supply system until the fault self-healing technology finishes the continuous power supply function of an accident safety power supply.
On the premise of keeping the main wiring and the running mode of the original power plant station direct-current power supply system unchanged, a fault self-healing system of the plant station direct-current power supply storage battery pack is formed by using partial functions of a configured valve-controlled lead-acid storage battery pack online monitoring device in a bypass mode and combining a segmented capacity converter and a non-floating-charging small-capacity lithium iron storage battery pack, the problem that the direct-current bus voltage is reduced or even loses power due to self protection when a DC/DC converter outputs impact current is solved, and the power supply reliability and the safe running level of the power plant station direct-current power supply system are improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A storage battery pack fault self-healing system for a power station comprises a valve-controlled lead-acid storage battery pack, wherein the valve-controlled lead-acid storage battery pack is connected to a direct-current bus of a direct-current power supply system of the power station, and the valve-controlled lead-acid storage battery pack is provided with a charging device; the system is characterized by also comprising a segmented capacity converter, a lithium battery pack, a valve-controlled lead-acid battery pack online monitoring device and a self-healing system control device;
the valve-controlled lead-acid storage battery pack is divided into a plurality of sections, and each section comprises a plurality of valve-controlled lead-acid storage batteries;
each valve-controlled lead-acid storage battery segment is provided with 1 segmented capacity converter which is connected with a lithium battery pack in parallel; the lithium battery pack is connected to the direct current bus;
the valve-regulated lead-acid storage battery pack online monitoring device is connected with the valve-regulated lead-acid storage battery pack and is used for monitoring the storage battery state of the valve-regulated lead-acid storage battery pack, including the single battery fault condition;
the self-healing system control device is connected with the valve-controlled lead-acid storage battery pack online monitoring device, the segmented capacity converter and the lithium battery pack, and is used for determining a fault storage battery through the monomer voltage of the storage battery and the internal temperature parameter of the battery when the valve-controlled lead-acid storage battery pack online monitoring device monitors that the valve-controlled lead-acid storage battery pack has storage battery faults, controlling and starting the segmented capacity converter of a fault-free storage battery section under the condition that the lithium battery pack continuously supplies power for a direct-current bus without intervals, enabling the normal storage battery section to continuously supply power for the direct-current bus, and recovering the power supply function of the valve-controlled lead-acid storage battery pack; meanwhile, the self-healing system control device supplements the discharged capacity for the lithium battery pack according to the real-time running state so as to prepare the capacity of the lithium battery pack.
2. The system according to claim 1, further comprising a set of voltage-reducing silicon chains, wherein the voltage-reducing silicon chains are disposed between the lithium battery pack and the dc bus, and one end of each voltage-reducing silicon chain is connected to the lithium battery pack and the other end of each voltage-reducing silicon chain is connected to the dc bus.
3. The self-healing system for the fault of the storage battery pack for the power plant station as claimed in claim 1, wherein the lithium battery pack is equipped with a supplementary charging device and a battery management system BMS, and the lithium battery pack is maintained and managed by combining the supplementary charging device and the battery management system BMS.
4. The system according to claim 1, wherein the valve-regulated lead-acid battery pack is uniformly divided into 4 sections, and each section comprises an equal number of valve-regulated lead-acid batteries.
5. The self-healing system for the failure of the storage battery pack for the power plant station according to claim 4, wherein nominal voltages of the direct current power supply system of the power plant station include 220V and 110V, and nominal voltages of the valve-regulated lead-acid storage battery include 2V, 6V and 12V;
when the system nominal voltage of a direct-current power supply of an electric power plant is 220V, the number of valve-controlled lead-acid storage batteries corresponding to the nominal voltage of 2V in the valve-controlled lead-acid storage battery pack is 104, and each section comprises 26 valve-controlled lead-acid storage batteries; when the nominal voltage of the system is 110V, the number of the valve-regulated lead-acid storage batteries corresponding to the nominal voltage of 2V in the valve-regulated lead-acid storage battery pack is 52, and each section comprises 13 valve-regulated lead-acid storage batteries.
6. The system according to claim 1, wherein the storage battery of the lithium battery pack is a lithium iron phosphate storage battery pack.
7. A method for self-healing of a fault of a storage battery pack for a power plant station, which is applied to the system for self-healing of a fault of a storage battery pack for a power plant station according to any one of claims 1 to 6, and which comprises:
and (3) normal operation of the valve-controlled storage battery pack:
all storage batteries in the valve-controlled lead-acid storage battery pack are connected to the direct-current bus in a series connection mode under the monitoring of the valve-controlled lead-acid storage battery pack on-line monitoring device, and the charging device supplies power to the direct-current bus in a floating charging mode and also performs supplementary charging on the valve-controlled lead-acid storage battery pack;
when the charging device stops working, the valve-controlled lead-acid storage battery pack keeps the series connection mode of the valve-controlled lead-acid storage battery pack to uninterruptedly supply power to the direct-current bus;
when the valve-controlled lead-acid storage battery pack has storage battery faults:
when the valve-controlled lead-acid storage battery pack has internal open circuit faults of individual storage batteries, firstly, the non-floating lithium-charged battery pack supplies power to the direct-current bus uninterruptedly and continuously in a seamless connection manner; then, according to the position of the failed storage battery detected by the valve-regulated lead-acid storage battery pack online monitoring device, starting a segmented capacity converter of a non-failed storage battery section, and supplying power to a direct-current bus through a lithium battery pack in a parallel connection mode; meanwhile, the self-healing system control device supplements the discharged capacity for the lithium battery pack according to the real-time running condition so as to prepare the capacity of the lithium battery pack;
the fault self-healing working steps of the valve-controlled lead-acid storage battery pack are as follows:
firstly, carrying out online monitoring on the single voltage, the group voltage, the single internal resistance and the internal temperature parameter of the storage battery of the valve-controlled lead-acid storage battery pack, and judging a fault storage battery according to the monitored parameter data;
and secondly, when the valve-regulated lead-acid storage battery pack has a fault, the lithium battery pack supplies power to the direct-current bus uninterruptedly and continuously, so that the uninterrupted power supply of the direct-current load is ensured, and meanwhile, the self-healing system control device restores the discharge of a non-fault storage battery in the valve-regulated lead-acid storage battery pack according to the judgment of the monitoring device of the storage battery pack on the fault battery.
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