CN112491132B - DC system and DC monitoring system - Google Patents
DC system and DC monitoring system Download PDFInfo
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- CN112491132B CN112491132B CN202011074933.7A CN202011074933A CN112491132B CN 112491132 B CN112491132 B CN 112491132B CN 202011074933 A CN202011074933 A CN 202011074933A CN 112491132 B CN112491132 B CN 112491132B
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a direct current system and a direct current monitoring system, wherein the direct current system comprises: lithium cell, signal acquisition subassembly, balanced circuit and controller. The signal acquisition assembly is arranged, and the signal acquisition assembly acquires the electric signal output by the lithium battery in real time and sends the electric signal to the controller. The controller controls the balance circuit to balance the output voltage of the lithium battery according to the electric signal, so that the direct current system can output stable voltage to improve the working stability of the direct current system. The embodiment of the application solves the technical problem of unstable output voltage of the current direct current system in the prior art, and achieves the technical effect of improving the stability of the output voltage of the direct current system.
Description
Technical Field
The present application relates to a dc power supply system, and more particularly, to a dc power supply system and a dc monitoring system.
Background
With the continuous development of power systems, the voltage level of a power plant is also higher and higher, and core equipment of the power plant is a generator set, so that the generator set plays a vital role in the electric energy output of the whole power plant. The control system of the generator set generally uses direct current, a special direct current system is required to be equipped, and the operation condition of the control special direct current system is directly related to the safe and stable operation of the whole power plant, so that the operation condition of the control special direct current system of the generator set needs to be monitored in real time to determine the normal operation of the control special direct current system.
At present, a valve-controlled sealed lead-acid storage battery with 6V or 12V is adopted in a special direct-current system for controlling a plurality of power plant generating sets, but the valve-controlled sealed lead-acid storage battery is sensitive and is easily influenced by environment, so that the output voltage of the direct-current system is unstable.
Disclosure of Invention
Based on this, it is necessary to provide a dc system and a dc monitoring system for solving the problem that the output voltage of the current dc system is unstable.
A direct current system comprising:
a lithium battery;
the signal acquisition component is in signal connection with the lithium battery and is used for acquiring an electric signal output by the lithium battery;
the output end of the balance circuit is electrically connected with the lithium battery;
the input end of the controller is in signal connection with the signal acquisition component, the output end of the controller is in signal connection with the control end of the balance circuit, and the controller is used for controlling the balance circuit to balance the output voltage of the lithium battery according to the electric signal.
In one embodiment, the balancing circuit is connected in parallel with the lithium battery, the balancing circuit comprising:
a resistor assembly;
and the switch component is connected in series with the resistor component, and the control end of the switch component is connected with the controller through signals.
In one embodiment, the balancing circuit includes:
and the control end of the DC-DC converter is in signal connection with the controller, the output end of the DC-DC converter is electrically connected with the lithium battery, and the DC-DC converter is used for balancing the output voltage of the lithium battery.
In one embodiment, the signal acquisition assembly comprises:
the input end of the voltage collector is in signal connection with the lithium battery, and the output end of the voltage collector is in signal connection with the input end of the controller;
the input end of the current collector is in signal connection with the lithium battery, and the output end of the current collector is in signal connection with the input end of the controller.
In one embodiment, the signal acquisition assembly further comprises:
the temperature collector is used for collecting the temperature of the lithium battery;
and the resistor collector is in signal connection with the lithium battery and is used for collecting the resistor of the lithium battery.
In one embodiment, the lithium battery is a lithium iron phosphate battery.
In one embodiment, the electrolyte of the lithium iron phosphate battery includes an oxidation-reduction additive.
In one embodiment, the oxidation-reduction additive comprises any one or more of acetylferrocene, cerium pentanitrate quaternary ammonium salt.
In one embodiment, the number of the lithium batteries is multiple, and the signal acquisition components are respectively connected with the lithium batteries in a signal manner and are respectively used for acquiring electric signals output by the lithium batteries;
the controller is used for determining whether a plurality of lithium batteries are faulty according to a plurality of the electric signals, and determining the fault position according to a plurality of the electric signals when the lithium batteries are faulty.
A direct current monitoring system comprising:
a direct current system as described above;
and the central control system is in signal connection with the controller system.
The embodiment of the application provides a direct current system, which comprises: lithium cell, signal acquisition subassembly, balanced circuit and controller. The signal acquisition assembly is arranged, and the signal acquisition assembly acquires the electric signal output by the lithium battery in real time and sends the electric signal to the controller. The controller controls the balance circuit to balance the output voltage of the lithium battery according to the electric signal, so that the direct current system can output stable voltage to improve the working stability of the direct current system. The embodiment of the application solves the technical problem of unstable output voltage of the current direct current system in the prior art, and achieves the technical effect of improving the stability of the output voltage of the direct current system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic diagram of a dc system and an application environment thereof according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a dc system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a DC system balancing circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a portion of a DC system according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a portion of a DC system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a dc monitoring system according to an embodiment of the present application.
Reference numerals illustrate:
10. a direct current system; 100. a lithium battery; 200. a signal acquisition assembly; 210. a voltage collector; 220. a current collector; 230. a temperature collector; 240. a resistor collector; 300. a balancing circuit; 310. a resistor assembly; 320. a switch assembly; 330. a DC-DC converter; 400. a controller; 20. a direct current monitoring system; 21. and a central control system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, a dc system and a dc monitoring system according to the present application will be described in further detail by examples below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1, an embodiment of the present application provides a dc system 10, which is applied to a control system of a generator set and supplies power to the control system of the generator set. When the direct current system is used, the direct current system is directly and electrically connected with the control system of the generator set to supply power for the control system of the generator set. The following specifically describes a control system of the dc system applied to a generator set.
Referring to fig. 2, one embodiment of the present application provides a dc system 10, comprising: lithium battery 100, signal acquisition assembly 200, balancing circuit 300, and controller 400.
The lithium battery 100 serves as a power source device of the dc system 10, and provides continuous power to the dc system 10. The lithium battery 100 has stable performance, can work in environments with large temperature differences, is not easily affected by the environments, and can continuously and stably output voltage. The lithium battery 100 may be any one or any combination of a lithium titanate (LiCoO 2) battery, a lithium manganate (LiMn 2O 4) battery, a lithium iron phosphate battery, or a disposable manganese dioxide lithium battery, which is not particularly limited, and may be specifically selected according to practical situations, so long as the function of providing a stable output voltage for the dc system 10 is satisfied.
The signal acquisition component 200 is in signal connection with the lithium battery 100, and the signal acquisition component 200 is used for acquiring an electrical signal output by the lithium battery 100, that is, a voltage and/or current signal output by the lithium battery 100. The number of the signal acquisition assemblies 200 may be one or a plurality, and the plurality of signal acquisition assemblies 200 respectively acquire different operation parameters of the lithium battery 100. The signal collection assembly 200 may be a current collector, such as an ammeter, a current transformer, etc., the signal collection assembly 200 may also be a voltage collector, such as a voltmeter, a voltage transformer, etc., and the signal collection assembly 200 may also be a resistance measuring instrument, a temperature measuring instrument, etc., which is not limited in this embodiment. The type, number, model, etc. of the signal acquisition assembly 200 are not limited in this embodiment, and may be specifically selected or set according to practical situations, so long as the function of acquiring the electrical signal output by the lithium battery 100 is satisfied.
The output end of the balancing circuit 300 is electrically connected with the lithium battery 100, and the balancing circuit 300 is configured to reduce the output voltage and/or the output current of the lithium battery 100 when the output of the lithium battery 100 is unstable, for example, overvoltage or overcurrent is generated, so as to prevent the generated overvoltage or overcurrent from affecting the normal operation of the control system of the generator set, and even breakdown the control system of the generator set, thereby causing dangerous accidents. The balancing current may be implemented by increasing the resistance of the lithium battery 100 or reducing the output voltage of the lithium battery 100, and the specific type of the balancing circuit 300 is not limited in this embodiment, and may be specifically selected or set according to the actual situation, so long as the function of balancing the output voltage of the lithium battery 100 is satisfied.
The input end of the controller 400 is in signal connection with the signal acquisition assembly 200, the output end of the controller 400 is in signal connection with the control end of the balancing circuit 300, and the controller 400 is used for controlling the balancing circuit 300 to balance the output voltage of the lithium battery 100 according to the electric signal. For example, when the controller 400 determines that the intensity of the electrical signal is greater than the preset threshold, the balancing circuit 300 is controlled to operate, so as to reduce the output voltage of the lithium battery 100, thereby achieving the purpose of stabilizing the output voltage of the lithium battery 100 and protecting the control system of the generator set.
The dc system 10 provided in this embodiment includes: lithium battery 100, signal acquisition assembly 200, balancing circuit 300, and controller 400. The balance circuit 300 is electrically connected with the output end of the lithium battery 100, the input end of the balance circuit 300 is electrically connected with the output end of the lithium battery 100, and the output end of the balance circuit 300 is electrically connected with the control system of the generator set to supply power to the control system of the generator set. The signal acquisition assembly 200 is in signal connection with the lithium battery 100, and acquires the electrical signal of the lithium battery 100, that is, the working state parameter of the lithium battery 100, in real time, and transmits the acquired electrical signal to the controller 400. The controller 400 analyzes and processes the received electric signal, determines whether the intensity of the electric signal exceeds a preset threshold, and determines that the lithium battery 100 works normally if the intensity of the electric signal does not exceed the preset threshold; if the intensity of the electrical signal exceeds the preset threshold, it is proved that the lithium battery 100 has abnormal discharge, and at this time, the controller 400 controls the balancing circuit 300 to decrease the output current and/or voltage of the lithium battery 100 by increasing the resistance, so as to achieve the purpose of stabilizing the output voltage of the lithium battery 100 and protecting the control system of the generator set.
The embodiment of the application provides a direct current system 10, which comprises: lithium battery 100, signal acquisition assembly 200, balancing circuit 300, and controller 400. By providing the signal acquisition assembly 200, the signal acquisition assembly 200 acquires the electric signal output by the lithium battery 100 in real time and sends the electric signal to the controller 400. The controller 400 controls the balancing circuit 300 to balance the output voltage of the lithium battery 100 according to the electric signal, so that the dc system 10 according to the embodiment of the application can output a stable voltage to improve the working stability of the dc system 10. The embodiment of the application solves the technical problem of unstable output voltage of the current direct current system 10 in the prior art, and achieves the technical effect of improving the stability of the output voltage of the direct current system 10.
Referring to fig. 3, in one embodiment, the balancing circuit 300 is connected in parallel with the lithium battery 100, and the balancing circuit 300 includes a resistor component 310 and a switch component 320.
The resistor assembly 310 is connected in parallel with the lithium battery 100 in operation, and the resistor assembly 310 is used for consuming overvoltage and/or overcurrent generated when the lithium battery 100 is unstable in operation. The resistor assembly 310 may include one or more resistors, and the resistors may be connected in series or in parallel, which is not specifically limited in this embodiment, and may be specifically selected or set according to practical situations.
The switch assembly 320 is connected in series with the resistor assembly 310, a control end of the switch assembly 320 is connected with the controller 400 in a signal manner, the switch assembly 320 is an electronic switch, and the controller 400 controls the electronic switch to be turned off or on. When the lithium battery 100 is operating normally, or the voltage output of the lithium battery 100 is stable, the electronic switch is turned off, the resistor assembly 310 is not connected in parallel with the lithium battery 100, and the lithium battery 100 operates normally. When an abnormality occurs in the lithium battery 100, for example, overvoltage or overcurrent occurs, the controller 400 controls the electronic switch to be turned on, and at this time, the resistor assembly 310 is connected in parallel with the lithium battery 100 to shunt the output current of the lithium battery 100, thereby reducing the output current of the lithium battery 100 and achieving the purpose of protecting the control system of the generator set. In this embodiment, the number of the electronic switches in the switch assembly 320 may be one or more, and a plurality of the electronic switches may be connected in series, so as to improve the working stability of the dc system 10 in this embodiment.
Referring to fig. 4, in one embodiment, the balancing circuit 300 includes: a DC-DC converter 330.
The control end of the DC-DC converter 330 is in signal connection with the controller 400, the output end of the DC-DC converter 330 is electrically connected with the lithium battery 100, and the DC-DC converter 330 is used for balancing the output voltage of the lithium battery 100. The DC-DC converter 330 may be a boost converter, a buck converter, or a boost converter, and this embodiment is preferably a boost converter, and may implement boost and buck functions at the same time, so that flexible adjustment is conveniently performed according to the working state of the lithium battery 100 and different needs of the generator set control system, so as to output different voltages. Once the type of the DC-DC converter 330 is fixed, the output voltage of the DC-DC converter 330 is relatively fixed, for example, the output voltage of the DC-DC converter 330 may be 5V, 10V, etc., so as to convert the voltage output by the lithium battery 100 into a stable 5V or 10V voltage, so that the voltage with a fixed size is provided for a control system of a generator set, and the stability is high. The type, number, etc. of the DC-DC converter 330 are not limited in this embodiment, and may be specifically selected or set according to practical situations.
Referring to fig. 5, in one embodiment, the signal acquisition assembly 200 includes: voltage collector 210, current collector 230, temperature collector 230, resistance collector 240.
An input end of the voltage collector 210 is in signal connection with the lithium battery 100, and an output end of the voltage collector 210 is in signal connection with an input end of the controller 400. The voltage collector 210 may be a voltmeter, and is connected in parallel with the lithium battery 100 when in use, to directly collect the voltage parameter of the lithium battery 100, with low cost and high fidelity of signal collection. The voltage collector 210 may also be a voltage transformer, and is not required to be electrically connected with the lithium battery 100, and only needs to be in close contact, so that the voltage parameters of the lithium battery 100 are collected through electromagnetic induction, and the lithium battery is convenient to move, high in flexibility and capable of collecting the voltage parameters at different positions. The type, number, etc. of the voltage collectors 210 are not limited in this embodiment, and may be specifically selected or set according to practical situations.
An input end of the current collector 230 is in signal connection with the lithium battery 100, and an output end of the current collector 230 is in signal connection with an input end of the controller 400. The current collector 230 may be an ammeter, and is electrically connected to the lithium battery 100 when in use, to directly collect current parameters of the lithium battery 100, with low cost and high fidelity of signal collection. The current collector 230 may also be a current transformer, and is not required to be electrically connected with the lithium battery 100, and only needs to be in close contact, so that the current parameters of the lithium battery 100 are collected through electromagnetic induction, and the lithium battery is convenient to move, high in flexibility and capable of collecting the current parameters at different positions. The type, number, etc. of the current collectors 230 are not limited in this embodiment, and may be specifically selected or set according to practical situations.
The temperature collector 230 is in signal connection with the controller 400, and the temperature collector 230 is configured to collect the temperature of the lithium battery 100, and transmit the temperature signal of the lithium battery 100 to the controller 400 for analysis and processing by the controller 400. The temperature collector 230 may be a contact type thermo detector, such as a thermocouple thermo detector, or a non-contact type thermo detector, such as an infrared thermo detector. The number of the temperature collectors 230 may be one or more, and when the number of the temperature collectors 230 is more than one, the temperature collectors 230 are respectively disposed at different positions of the lithium battery 100 to measure temperature parameters of different positions of the lithium battery 100, so that more accurate and comprehensive temperature parameters of the working state of the lithium battery 100 can be obtained, and the judgment accuracy of the controller 400 is improved, thereby improving the output stability of the direct current system 10 provided in this embodiment.
The input end of the resistance collector 240 is in signal connection with the lithium battery 100, the output end of the resistance collector 240 is in signal connection with the controller 400, and the resistance collector 240 is used for collecting the resistance of the lithium battery 100 and transmitting the resistance signal of the lithium battery 100 to the controller 400 for analysis and processing by the controller 400. The number of the resistor collectors 240 may be one or more, and in this embodiment, the number, the model, etc. of the resistor collectors 240 are not limited, and may be specifically selected according to actual situations, so long as the function of collecting the resistor of the lithium battery 100 is satisfied.
In one embodiment, the lithium battery 100 is a lithium iron phosphate battery. The lithium iron phosphate battery is a lithium ion battery using lithium iron phosphate as a positive electrode material, has good high temperature resistance, has an electrothermal peak value of 350-500 ℃, has a wide working stability range of 20-75 ℃ and can work at different environmental temperatures, thereby improving the adaptability of the direct current system 10 and the working stability under different temperature environments. The lithium iron phosphate battery has no memory effect, that is, no matter what state the lithium iron phosphate battery is in, the lithium iron phosphate battery can be used at any time without being put up and recharged, and has excellent working performance. Meanwhile, the lithium iron phosphate battery also has the excellent performances of large capacity and long service life, and can prolong the power supply time and improve the power supply quantity of the direct current system 10. The specific model, type, etc. of the lithium iron phosphate battery are not limited in this embodiment, and may be specifically selected according to practical situations.
In a specific embodiment, the electrolyte of the lithium iron phosphate battery 100 contains an oxidation-reduction additive, the lithium iron phosphate in the lithium iron phosphate battery 100 and lithium ions are in a dynamic balance state of consumption and production, and the reaction limit and dynamic balance between the lithium iron phosphate and lithium ions are maintained inside the lithium iron phosphate battery 100. The oxidation-reduction additive is oxidized on the positive electrode under a certain voltage to form active molecules, and then diffuses to the negative electrode to be reduced to neutral molecules, namely, a continuous oxidation-reduction balance process is established in the battery, a loop is formed, charges accumulated on the power-down electrode and excessive current in the battery are released to play a role in protection, an electrochemical self-protection mechanism for preventing overcharge is established, the problem of battery overcharge can be effectively solved, and therefore the working stability of the lithium iron phosphate battery is improved, namely, the working stability of the direct current system 10 in the embodiment is improved. The redox additive contains any one or a combination of a plurality of acetyl ferrocene and pentanitrate cerium quaternary ammonium salt, the types, the addition amounts and the like of the redox additive are not limited, and the redox additive can be specifically selected or set according to actual conditions, and the redox additive only needs to be full of the functions of preventing overcharge and dynamic electrochemical stabilization.
In one embodiment, the number of the lithium batteries 100 is plural, the signal acquisition component 200 is respectively in signal connection with plural lithium batteries 100, and plural lithium batteries 100 are respectively used for acquiring electrical signals output by plural lithium batteries 100. The controller 400 is configured to determine whether a plurality of the lithium batteries 100 are malfunctioning according to a plurality of the electrical signals, and determine a location of the malfunction according to a plurality of the electrical signals in case of malfunction. The lithium battery 100 may include a main battery pack and a standby battery pack, where the number of batteries in each main battery pack is greater than the number of batteries in the standby battery pack, so as to reduce the cost of the dc system 10 while ensuring that the dc system 10 operates stably.
The direct current system 10 of the present embodiment adopts active equalization, that is, adding an oxidation-reduction additive into the electrolyte of the lithium battery 100, and adopts passive equalization, that is, a passive equalization system composed of the signal acquisition component 200, the equalization circuit 300 and the controller 400, where the active equalization system and the passive equalization system cooperate to realize stable and safe operation of the direct current system 10.
The controller 400 in this embodiment may also control the charging of the lithium battery 100, for example, when the lithium battery 100 is charged, in the first 80% of the stages, the charging is performed with a large current, and the remaining 20% is performed with a small current, and once the lithium battery 100 is fully charged, the charging efficiency of the lithium battery 100 is improved by performing a float charging. When the output voltage of the lithium battery 100 is too high, the balancing circuit 300 may balance the output voltage of the lithium battery 100, or directly shut down the lithium battery 100, thereby improving the working stability of the dc system 10 according to the present embodiment.
Referring to fig. 6, an embodiment of the present application provides a dc monitoring system 20, including: a direct current system 10 and a central control system 21.
The beneficial effects of the dc system 10 are described in detail in the above embodiments, and are not described herein.
The central control system 21 is in signal connection with the controller 400, and the central control system 21 is used for monitoring the direct current system 10, monitoring whether the direct current system 10 works normally, acquiring daily operation parameters of the direct current system 10, and the like.
In one embodiment, the controller 400 may establish the dc system simulation model by using the electrical signals of the lithium battery 100 collected by the collection assembly, that is, the operation parameters of the lithium battery 100, and the mechanical structural parameters of the lithium battery 100, and store the dc system simulation model in the controller 400 or the central control system 21. The DC system simulation model can provide a visual DC system 10, a worker can carry out remote panoramic visual monitoring through the DC system simulation model, when an abnormality is found in a certain parameter in the DC system 10, the fault position can be determined only through the abnormal parameter, and the worker can quickly solve through remote control or directly go to the fault position for maintenance, so that the problem of needing a large amount of troubleshooting of the fault determination position is avoided, and the maintenance efficiency is greatly improved.
In one embodiment, the signal acquisition component 200, the controller 400 and the central control system 21 may be connected by wired communication, or may be connected by wireless communication, such as 3G, 4G, bluetooth, etc., so as to avoid the need for on-site wiring and improve the flexibility of transmission. Meanwhile, the communication among the signal acquisition component 200, the controller 400 and the central control system 21 may be encrypted, for example, the operation may be limited by setting multiple authentications such as a user name, a password, an authorization level, a security responsibility partition definition, etc., so as to improve the data security of the dc system 10 and the dc monitoring system 20 in this embodiment.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A dc system, comprising:
a lithium battery;
the signal acquisition component is in signal connection with the lithium battery and is used for acquiring an electric signal output by the lithium battery;
the output end of the balance circuit is electrically connected with the lithium battery;
the input end of the controller is in signal connection with the signal acquisition component, the output end of the controller is in signal connection with the control end of the balance circuit, and the controller is used for controlling the balance circuit to increase the resistance of the lithium battery or reduce the output voltage of the lithium battery to balance the output voltage of the lithium battery according to the electric signal;
wherein the balancing circuit comprises: a resistor assembly; the switch component is connected in series with the resistor component, the control end of the switch component is connected with the controller in a signal manner, and the resistor component is used for consuming overvoltage and/or overcurrent generated when the lithium battery works unstably; or alternatively, the process may be performed,
the balancing circuit includes: and the control end of the DC-DC converter is in signal connection with the controller, the output end of the DC-DC converter is electrically connected with the lithium battery, and the DC-DC converter is used for balancing the output voltage of the lithium battery.
2. The direct current system according to claim 1, wherein the switch assembly is an electronic switch, the controller controls the electronic switch to be opened when the lithium battery is in normal operation or when the voltage output of the lithium battery is stable, and controls the electronic switch to be closed when the lithium battery is abnormal.
3. The direct current system according to claim 1, wherein the DC-DC converter is any one of a boost converter, a buck converter, and a boost converter.
4. The direct current system of claim 1, wherein the signal acquisition assembly comprises:
the input end of the voltage collector is in signal connection with the lithium battery, and the output end of the voltage collector is in signal connection with the input end of the controller;
the input end of the current collector is in signal connection with the lithium battery, and the output end of the current collector is in signal connection with the input end of the controller.
5. The direct current system of claim 4, wherein the signal acquisition assembly further comprises:
the temperature collector is used for collecting the temperature of the lithium battery;
and the resistor collector is in signal connection with the lithium battery and is used for collecting the resistor of the lithium battery.
6. The direct current system according to claim 1, wherein the lithium battery is a lithium iron phosphate battery.
7. The direct current system according to claim 6, wherein the electrolyte of the lithium iron phosphate battery comprises an oxidation-reduction additive.
8. The direct current system according to claim 7, wherein the oxidation-reduction additive comprises any one or more of acetylferrocene, cerous pentanitrate quaternary ammonium salt.
9. The direct current system according to claim 1, wherein the number of the lithium batteries is a plurality, the signal acquisition components are respectively connected with the lithium batteries in a signal manner and are respectively used for acquiring electric signals output by the lithium batteries;
the controller is used for determining whether a plurality of lithium batteries are faulty according to a plurality of the electric signals, and determining the fault position according to a plurality of the electric signals when the lithium batteries are faulty.
10. A direct current monitoring system, comprising:
the direct current system according to any one of claims 1-9;
and the central control system is in signal connection with the controller system.
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| CN202011074933.7A CN112491132B (en) | 2020-10-09 | 2020-10-09 | DC system and DC monitoring system |
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| CN202011074933.7A CN112491132B (en) | 2020-10-09 | 2020-10-09 | DC system and DC monitoring system |
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| CN108631444A (en) * | 2018-05-30 | 2018-10-09 | 国网江苏电力设计咨询有限公司 | Transforming plant DC power supply hierarchical monitoring based on ferric phosphate lithium cell manages system |
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| US7737580B2 (en) * | 2004-08-31 | 2010-06-15 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
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| CN106655317A (en) * | 2016-09-27 | 2017-05-10 | 武汉纺织大学 | Compound active equalization circuit based on FPGA architecture |
| CN108110844A (en) * | 2017-12-29 | 2018-06-01 | 山东鲁能智能技术有限公司 | A kind of balancer of battery pack |
| CN108631444A (en) * | 2018-05-30 | 2018-10-09 | 国网江苏电力设计咨询有限公司 | Transforming plant DC power supply hierarchical monitoring based on ferric phosphate lithium cell manages system |
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