CN107171392B - Standby direct current system of transformer substation - Google Patents
Standby direct current system of transformer substation Download PDFInfo
- Publication number
- CN107171392B CN107171392B CN201710465368.9A CN201710465368A CN107171392B CN 107171392 B CN107171392 B CN 107171392B CN 201710465368 A CN201710465368 A CN 201710465368A CN 107171392 B CN107171392 B CN 107171392B
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- direct current
- storage battery
- sensing circuit
- batteries
- storage
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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
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention provides a standby direct current system of a transformer substation, which can be used for replacing the existing direct current system with serial power supply of storage battery monomers, and comprises the following components: the system comprises an electric energy quality maintaining device, a plurality of storage batteries and a control module. The control module can control the connection between the storage battery and the direct current bus according to the voltage at two ends of the storage battery, so that the storage battery can be discharged one by one based on monomer decision, loss and degradation of the storage battery under floating charge in the existing operation mode are avoided, the problem that the whole storage battery is accelerated to degrade due to overlarge degradation degree of a certain storage battery monomer in the existing operation mode of the storage battery, and the service life of the storage battery is influenced is avoided, and the storage battery capacity and the service life of the storage battery are furthest used. This is a dc system that can be used to replace the existing battery cells in series.
Description
Technical Field
The invention relates to the technical field of transformer substation direct current systems, in particular to a transformer substation standby direct current system.
Background
The parameters of each single battery cannot be guaranteed to be consistent when the single battery leaves a factory; when the power supply enterprises purchase, the single parameter errors are within a certain value as acceptance criteria. When the direct current storage battery system for the station is built, the parameters such as the capacity, the terminal voltage and the like of the storage battery are required to be completely consistent, the internal resistance error of the storage battery is required to be within 5%, and the storage battery is often required to be a product in the same batch in actual operation. This greatly constrains replacement of the spare parts after subsequent battery cell degradation.
The storage battery for the substation or the storage battery for communication is characterized in that a plurality of storage battery monomers are connected in series to form groups, the direct-current charger based on a high-frequency switch is used for directly controlling the charge and discharge of the whole group of storage batteries, and the terminal voltage, the temperature and other parameters of each group of storage batteries are measured and monitored through a storage battery state inspection instrument.
The battery system of the power supply enterprise has a number of on-site backup cells. For example, a voltage class of 110V is adopted for a direct current of a certain substation, so that the storage battery system adopts 52 groups of storage batteries in series connection, and meanwhile, 2 on-site standby single storage batteries are prepared.
Therefore, the invention discloses a transformer substation direct current power supply system which is different from the traditional single battery operation mode.
Disclosure of Invention
Under the existing charging and discharging operation mode of the whole group of storage batteries controlled by the power supply enterprises, the phenomenon that the storage batteries inevitably exist during floating charging (more than 99% of the working time of the storage batteries of the power supply enterprises are in a floating charging state): most of the monomers are in a floating state, one monomer is in an overcharged state, and one monomer is in an undercharged state. This phenomenon inevitably leads to a decrease in the battery capacity of the battery pack, a decrease in the service life of the battery, and even to failure of the core capacity test (when the actual capacity is less than 80% of the rated capacity, it is determined that the core capacity is failed, and the battery needs to be replaced at this time).
The invention connects the storage battery monomers in parallel, and inputs the electrical information of each sensor to the control system, and the control system controls one or more of the storage battery monomers connected in parallel to supply power to the direct current bus.
The storage battery monomer supplies power to the direct current bus through the power quality maintaining device. The power quality maintenance device may be represented simply as consisting of a direct current transformer (e.g., a DC/DC circuit module or otherwise) and a voltage retainer (e.g., a magnetic levitation flywheel energy storage device, a super capacitor array, etc.). This is a dc system that can be used to replace the existing battery cells in series.
Based on the technical problem, the invention provides a standby direct current system of a transformer substation, which has the following specific technical scheme.
A backup direct current system of a substation, comprising: the system comprises an electric energy quality maintaining device, a plurality of storage batteries and a control module; each storage battery is connected in parallel and can supply power for the direct current bus connection, and the control module controls one or more of the storage battery monomers connected in parallel to supply power to the direct current bus; when the terminal voltage of one of the storage batteries supplying power to the direct current bus is lower than a preset threshold, the control module disconnects the storage battery which is higher than the preset threshold from the direct current bus, and enables the other storage battery with the terminal voltage meeting the requirement to be connected with the direct current bus for discharging and supplying energy.
Further, the power quality maintenance apparatus includes: a dc transformer and a voltage holder.
Further, the direct current transformer is a DC/DC circuit module.
Further, the voltage retainer is a magnetic levitation flywheel energy storage device and/or a super capacitor array.
The voltage retainer (such as a magnetic suspension flywheel energy storage device, a super capacitor array and the like) is sensitive in response, can ensure the quality of supplied electric energy, and can tolerate ripple noise caused by DC and short interruption thereof. A DC transformer (e.g., a DC/DC circuit module or otherwise) is used to ensure that the terminal voltages of the parallel batteries all become the voltages required for the DC bus.
Further, the plurality of storage batteries are one or more of lead acid batteries, lithium batteries, and phosphoric acid batteries. This can be applied to batteries having various electromotive forces, and also to batteries having various degradation levels. They can simultaneously connect in parallel with the controller via the controllable switch, awaiting power to be supplied in connection with the bus.
Further, the threshold value is determined by sensing the electromotive force of the battery, and the threshold value is set adaptively.
Further, the control module includes a voltage sensing circuit for detecting a terminal voltage of a battery that is supplying power to the dc bus.
Further, the voltage sensing circuit is a static synchronous compensation circuit, a synchronous signal generating circuit or a magnetic compensation Hall sampling circuit.
Further, the control module comprises a plurality of switches, and one switch controls the connection between one storage battery and the power generation device to be disconnected.
Further, the switch is a high power CMOS switch and/or an IGBT switch.
Further, the control module includes a current sensing circuit meter for detecting a total current of a battery that is supplying power to the dc bus.
Further, the current sensing circuit may use a static synchronous compensation circuit, a synchronous signal generation circuit, or a magnetic compensation hall sampling circuit.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can directly connect wires at two ends of the battery to supply energy, and is convenient to use;
2. the capacity and the service life of the storage battery are used to the maximum extent;
3. the number N of the storage batteries is not controlled; the electromotive force of the storage battery is not limited, and lead acid, lithium batteries, phosphoric acid batteries and other batteries can be connected into the system at the same time; the storage batteries with different degradation degrees can be connected into the system.
Drawings
Fig. 1 is a schematic diagram of a substation backup dc system of the present invention.
Reference numerals illustrate: 1-magnetic suspension flywheel energy storage device, 2-DC chopper, 3-current sensing circuit, 4-voltage sensing circuit, 5-storage battery 1, 6-storage battery 2, 7-storage battery N, 8-switch, 9-controller.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Referring to fig. 1, the invention provides a standby direct current system of a transformer substation, which comprises an electric energy quality maintaining device composed of a magnetic suspension flywheel energy storage device 1 and a DC chopper device 2, a plurality of storage batteries numbered 1-n, and a control module composed of a voltage sensing circuit 4, a current sensing circuit 3, a controller 9 and a plurality of switches 8.
The direct current bus is connected with the input end of the magnetic suspension flywheel energy storage device 1, and the output end of the magnetic suspension flywheel energy storage device 1 is connected with the input end of the DC chopper device 2. The DC chopper device 2 is connected to the storage batteries, each in parallel. A switch 8 is arranged on the parallel branch of each storage battery. The parallel bus of the storage battery is provided with a current sensing circuit 3. The voltage sensing circuit 4 is connected in parallel with the battery. The controller 9 is connected to the current sensing circuit 3, the voltage sensing circuit 4, and each switch 8, respectively.
When the direct current system for the transformer substation works normally, the system disclosed by the invention is required to have zero power output. At this time, the electric energy quality maintaining device is on the idle load and direct current bus, if the electric energy quality maintaining device selects the flywheel, the flywheel will maintain the rotation speed omega; if the capacitor is selected, the capacitor holding voltage is a certain value U.
The direct current system for the transformer substation loses power due to the accident, so that the device can rapidly respond to supply power to the direct current bus. At this time, since there is a power output such as the electric power quality maintaining means selects the flywheel, the rotation speed ω of the flywheel will decrease. The device will set a constant less than 1, such as η being 0.98, so that frequent start-up of the flywheel due to inherent losses of the machine etc. is avoided. When the flywheel speed drops to eta omega, the power quality maintaining device should wake the control device to select the storage battery monomer to supply power to the direct current bus through the power quality maintaining device.
When the DC chopper device 2 detects that the flywheel is decelerated to 0.98 omega, the DC starts to work, 1-N is strategically given to the switch to be conducted through the controller, and when the controller detects that the voltage sensing circuit 4 is lower than 1-1.1 times, preferably 1.05 times of cut-off voltage. The next numbered switch is given on. The number N of the storage batteries is not controlled; the electromotive force of the storage battery is not limited, and lead acid, lithium batteries, phosphoric acid batteries and other batteries can be connected into the system at the same time; the storage batteries with different degradation degrees can be connected into the system.
When the fact that the direct current bus is powered by an external power supply is detected, the device stops working, and the flywheel recovers the rotating speed omega to idle.
The threshold value of the cutoff voltage is determined by: 1. the lead-acid storage battery is protected from being lowered to a cut-off voltage during discharging, so that the storage battery is prevented from being degraded due to single deep discharging. 2. The storage battery with memory benefit such as nickel-hydrogen storage battery is protected, and the storage battery can be discharged to be close to the cut-off voltage, so that the single capacity of the storage battery is utilized to the maximum extent. For example, the threshold value may be manually set as a fixed multiple of the cutoff voltage, a function of the cutoff voltage, the ambient temperature, or the like, or the threshold value may be set to determine the type of the battery by sensing the electromotive force of the battery, and the set value of the threshold value may be adaptively selected.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. The standby direct current system of the transformer substation is characterized by comprising an electric energy quality maintaining device composed of a magnetic suspension flywheel energy storage device and a DC chopper device, a plurality of storage batteries numbered 1-N, and a control module composed of a voltage sensing circuit, a current sensing circuit, a controller and a plurality of switches;
the DC bus is connected with the input end of the magnetic suspension flywheel energy storage device, the output end of the magnetic suspension flywheel energy storage device is connected with the input end of the DC chopper device, the DC chopper device is connected with the storage batteries, each storage battery is connected in parallel, a switch is arranged on a parallel branch of each storage battery, a current sensing circuit is arranged on a bus connected with the storage batteries in parallel, the voltage sensing circuit is connected with the storage batteries in parallel, and the controller is respectively connected with the current sensing circuit, the voltage sensing circuit and each switch;
when the direct current system for the transformer substation works normally, the system outputs zero power, at the moment, the electric energy quality maintaining device is unloaded on the direct current bus, and the flywheel keeps the rotating speed omega;
when the direct current system for the transformer substation loses power due to reasons, the electric energy quality maintaining device supplies power to the direct current bus, the rotating speed omega of the flywheel is reduced, and when the rotating speed of the flywheel is reduced to eta omega, the electric energy quality maintaining device wakes the control module to select the storage battery monomer to supply power to the direct current bus through the electric energy quality maintaining device, wherein eta is a constant smaller than 1;
detecting a magnetic suspension flywheel energy storage device by a DC chopper device, starting DC to work when the flywheel is decelerated to eta omega, strategically giving 1-N to the switch to be conducted by a controller, and giving the next numbered switch to be conducted when the voltage sensing circuit detected by the controller is lower than 1-1.1 times of cut-off voltage;
when the DC bus is detected to be supplied with power by an external power supply, the power quality maintaining device stops working, and the flywheel recovers the rotating speed omega to idle.
2. The backup direct current system of a substation of claim 1, wherein: the plurality of storage batteries are one or more of lead-acid batteries, lithium batteries and phosphoric acid batteries.
3. The backup direct current system of a substation of claim 1, wherein: the voltage sensing circuit is used for detecting the terminal voltage of the storage battery supplying power to the direct current bus.
4. A substation backup direct current system according to claim 3, characterized in that: the voltage sensing circuit uses one of a static synchronous compensation circuit, a synchronous signal generation circuit or a magnetic compensation Hall sampling circuit.
5. The backup direct current system of a substation of claim 1, wherein: the current sensing circuit is used for detecting the total current of the storage battery supplying power to the direct current bus.
6. The backup dc system of claim 5, wherein: the current sensing circuit uses one of a static synchronous compensation circuit, a synchronous signal generation circuit or a magnetic compensation Hall sampling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710465368.9A CN107171392B (en) | 2017-06-19 | 2017-06-19 | Standby direct current system of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710465368.9A CN107171392B (en) | 2017-06-19 | 2017-06-19 | Standby direct current system of transformer substation |
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| Publication Number | Publication Date |
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| CN107171392A CN107171392A (en) | 2017-09-15 |
| CN107171392B true CN107171392B (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710465368.9A Active CN107171392B (en) | 2017-06-19 | 2017-06-19 | Standby direct current system of transformer substation |
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Citations (5)
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| JPH0623162U (en) * | 1992-07-31 | 1994-03-25 | アイコム株式会社 | Battery pack with generator |
| CN201726194U (en) * | 2010-05-31 | 2011-01-26 | 深圳市保达发电设备有限公司 | Uninterruptable power-output power supply system for storing energy in flywheel |
| CN202402482U (en) * | 2011-12-31 | 2012-08-29 | 河南速达电动汽车科技有限公司 | High-speed magnetic suspension bearing dedicated to flywheel energy storage battery |
| CN204231154U (en) * | 2014-08-05 | 2015-03-25 | 南京工程学院 | A kind of magnetic levitation switch magnetic resistance fly-wheel motor |
| CN106646037A (en) * | 2016-11-28 | 2017-05-10 | 国家电网公司 | DC system real-time detection method for transformer station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10270305B2 (en) * | 2015-12-07 | 2019-04-23 | Hamilton Sundstrand Corporation | Motor-generator with multiple stator windings |
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2017
- 2017-06-19 CN CN201710465368.9A patent/CN107171392B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623162U (en) * | 1992-07-31 | 1994-03-25 | アイコム株式会社 | Battery pack with generator |
| CN201726194U (en) * | 2010-05-31 | 2011-01-26 | 深圳市保达发电设备有限公司 | Uninterruptable power-output power supply system for storing energy in flywheel |
| CN202402482U (en) * | 2011-12-31 | 2012-08-29 | 河南速达电动汽车科技有限公司 | High-speed magnetic suspension bearing dedicated to flywheel energy storage battery |
| CN204231154U (en) * | 2014-08-05 | 2015-03-25 | 南京工程学院 | A kind of magnetic levitation switch magnetic resistance fly-wheel motor |
| CN106646037A (en) * | 2016-11-28 | 2017-05-10 | 国家电网公司 | DC system real-time detection method for transformer station |
Non-Patent Citations (3)
| Title |
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| Chen Junling,et al..A novel uninterruptible power supply using flywheel energy storage unit.《The 4th International Power Electronics and Motion Control Conference, 2004. IPEMC 2004》.2005,第1180-1184页. * |
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| CN107171392A (en) | 2017-09-15 |
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Address after: 516001 Huizhou Avenue, Huicheng District, Huizhou, Guangdong Province, No. 19 Applicant after: HUIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID Co.,Ltd. Address before: 516001 Huizhou Avenue, Huicheng District, Guangzhou, Guangdong Province, No. 19 Applicant before: HUIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID Co.,Ltd. |
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