CN107749656B - Energy storage power supply voltage balance control system and method - Google Patents
Energy storage power supply voltage balance control system and method Download PDFInfo
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- CN107749656B CN107749656B CN201711131615.8A CN201711131615A CN107749656B CN 107749656 B CN107749656 B CN 107749656B CN 201711131615 A CN201711131615 A CN 201711131615A CN 107749656 B CN107749656 B CN 107749656B
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a voltage balance control method for a super-capacitor energy storage power supply. The method is characterized in that the sampling of voltage, current and temperature and the starting of the equalizing module are operated in a time-sharing mode, namely, the method comprises the following steps: and (4) managing the cyclic sequence of sampling, judging, equalizing and sampling. In the sampling link, respectively collecting the voltage, current and temperature information of a super capacitor monomer in the energy storage power supply and uploading the information to a central control unit through a CAN network; in the judgment link, the central control unit divides the capacitance into three categories of normal, early warning and alarming according to the data of the sensor; in the balancing link, the central control unit balances the starting voltages of the single bodies belonging to the early warning and alarming categories through the DC/DC module. On the other hand, the method provided by the invention is also suitable for the energy storage power supply voltage balance management consisting of the hybrid super capacitor. The invention effectively improves the running efficiency and the safety performance of the super-capacitor energy storage power supply and has good application prospect in the energy storage type electric car.
Description
Technical Field
The invention relates to the technical field of energy storage devices, in particular to a system and a method for controlling voltage balance of an energy storage power supply.
Background
At present, some achievements have been made in the design of management systems of energy storage power supplies at home and abroad, but there is still room for continuous improvement. Particularly, most of the energy storage power modules using the super capacitor as an energy storage element do not acquire module current data, and meanwhile, the acquisition of temperature data is lacked, and generally, only 2 paths of temperature data are acquired by one module, so that the state of the module cannot be comprehensively mastered. After the multi-channel sensor is additionally arranged, the management system is affected by interference and operation space, and the management system does not have the capability of real-time acquisition and calculation. Therefore, a better voltage balance control method needs to be provided for the super-capacitor energy storage power supply, the problems that the existing energy storage power supply management system is incomplete in data acquisition and insufficient in operation capacity are solved, and the performance of the energy storage power supply management system is improved through time-sharing acquisition balance.
Disclosure of Invention
The invention designs and creatively provides a voltage balance control scheme of time-sharing sampling and balancing, and carries out time-sharing operation on the sampling of voltage, current and temperature and the starting of a balancing module, namely according to the following steps: and the energy storage power supply module is managed by the cyclic sequence of sampling, judging, balancing and sampling. In the sampling link, the voltage, current and temperature sensors respectively collect the voltage, current and temperature information of the super capacitor single body in the energy storage power supply and transmit the voltage, current and temperature information to the central control unit through the CAN network; in the judgment link, the central control unit divides the capacitance into three categories of normal, early warning and warning according to the data of the sensor, wherein the warning is divided into warning (high) and warning (low), and the early warning is divided into early warning (high) and early warning (low); in the balancing link, the central control unit sends out an instruction, and the voltage balancing is started for the super capacitors belonging to the early warning and alarming categories through the DC/DC module. The scheme provided by the invention well solves the problems of interference and operation space, and has great prospect of engineering popularization.
The technical scheme of the invention is as follows:
a voltage balance control system of an energy storage power supply comprises a measuring module, a voltage balance control module, a communication control module and a central controller; the measuring module comprises a current sampling module, a temperature sensor, a voltage measuring device and a first network interface; the current sampling module, the temperature sensor and the voltage measuring device are used for respectively measuring current, temperature and voltage data of all the super capacitor monomers in the super capacitor group to be balanced; the first network interface transmits the acquired current, temperature and voltage data to the central controller through the communication control module; the central controller comprises a voltage judgment module and a temperature judgment module, and the voltage balance control module comprises a second network interface, a bidirectional DC/DC circuit, a discharge resistor and a fuse; the second network interface receives instructions from the central controller through the communication control module, the bidirectional DC/DC circuit and the discharge resistor are respectively connected with all the super capacitor units through the gating switches, the on and off of the bidirectional DC/DC circuit and the discharge resistor are executed according to the instructions of the central control unit, the bidirectional DC/DC circuit is used for adjusting the voltage of the super capacitor units, and the fuse is used for fusing when the DC/DC circuit or the discharge resistor fails so as to protect the super capacitor units.
The energy storage power supply voltage balance control system further comprises a display, and the display is used for displaying the alarm signal and the current sampling value of the central controller.
The energy storage power supply voltage balance control system is characterized by further comprising a fan, wherein the fan is connected with the central controller and used for supplying air to the inside of the super capacitor bank.
The communication control module is a CAN network bus.
The current sampling module is a current sampling resistor, and the current sampling resistor is connected in series into a main current loop of the super capacitor bank.
The energy storage power supply voltage balance control method of the system comprises the following steps:
A1. acquiring voltage, current and temperature data of the super capacitor single bodies in the super capacitor bank, and transmitting the data to a central controller;
A2. judging whether the monomer is in overvoltage or not, if the monomer is in overvoltage, marking the state of the monomer as high alarm by the central controller;
A3. judging whether the monomer is under-voltage or not, if so, marking the state of the monomer as alarm low by the central controller;
A4. judging whether the monomer has overhigh temperature or not, if the monomer has overhigh temperature, marking the state of the monomer as high alarm by the central controller;
A5. calculating the average voltage of all the monomers, and marking the monomer state of the capacitor monomer with the voltage higher than the average value by a certain threshold value as early warning high;
A6. marking the monomer state of the capacitor monomer with the voltage lower than the average value by a certain threshold value as low early warning;
A7. marking the monomer state of the rest capacitor monomers as normal;
A8. the central controller sends out an instruction, a discharge resistance loop is connected to the single body with the high alarm state, the alarm state is transmitted to the display screen, and the air supply quantity in the super capacitor bank is increased;
for the monomer with the early warning high state, a DC/DC voltage reduction circuit is switched on;
turning on a DC/DC booster circuit for the monomer with low early warning state;
A9. and circularly executing the steps A1-A8 until all the capacitor cell voltages are kept within a certain range of the average value, and simultaneously ensuring that no over-temperature cell exists.
The energy storage power module structure and the balance control method provided by the invention have the following advantages:
1. accurate monitoring energy storage power supply module state
General energy storage module in the existing market does not possess multichannel temperature acquisition and current sampling function, consequently, can't accurately master the state of every monomer in the energy storage module, when a certain monomer appears the excess temperature trouble in energy storage system, often can not in time discover until the evolution is serious trouble, brings the safety risk. The invention provides a measuring scheme for the temperature, the voltage and the current of each monomer, which can accurately monitor the state of the monomer and find out the hidden trouble in time.
2. Improving voltage balance control efficiency
The importance of voltage balance is self-evident to the energy storage module, the previous engineering application case usually adopts a scheme of real-time sampling and balancing, but with the continuous increase of the scale of the energy storage power supply, the operation capability and the anti-interference capability are continuously challenged, and the faults caused by the operation capability and the anti-interference capability are very common in the current engineering. According to the scheme provided by the invention, by means of a time-sharing sampling and balancing method, the hardware defect of insufficient operation space is effectively avoided, and meanwhile, the working efficiency of the power management system is improved.
3. Modular design
The invention carries out modular design on the measuring module and the balancing module of the Capacitance Management System (CMS), and provides convenience for subsequent engineering application and maintenance.
Drawings
Fig. 1 is a schematic structural diagram of a super capacitor energy storage power supply voltage balancing device.
Fig. 2 is a schematic diagram of a voltage balance control method of a super capacitor energy storage power supply.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Examples
Fig. 1 is a hardware schematic diagram of an equalization scheme according to the present invention. An embodiment of the present invention will be described in detail below with reference to fig. 1 by way of specific examples.
In one embodiment, the energy storage power supply voltage balance control system comprises a measuring module, a voltage balance control module, a communication control module and a central controller; the measuring module comprises a current sampling module, a temperature sensor, a voltage measuring device and a first network interface; the current sampling module, the temperature sensor and the voltage measuring device are used for respectively measuring current, temperature and voltage data of all the super capacitor monomers in the super capacitor group to be balanced; the first network interface transmits the acquired current, temperature and voltage data to the central controller through the communication control module; the central controller comprises a voltage judgment module and a temperature judgment module, and the voltage balance control module comprises a second network interface, a bidirectional DC/DC circuit, a discharge resistor and a fuse; the second network interface receives instructions from the central controller through the communication control module, the bidirectional DC/DC circuit and the discharge resistor are respectively connected with all the super capacitor units through the gating switches, the on and off of the bidirectional DC/DC circuit and the discharge resistor are executed according to the instructions of the central control unit, the bidirectional DC/DC circuit is used for adjusting the voltage of the super capacitor units, and the fuse is used for fusing when the DC/DC circuit or the discharge resistor fails so as to protect the super capacitor units. The energy storage power supply voltage balance control system further comprises a display, and the display is used for displaying the alarm signal and the current sampling value of the central controller. The energy storage power supply voltage balance control system is characterized by further comprising a fan, wherein the fan is connected with the central controller and used for supplying air to the inside of the super capacitor bank.
In an embodiment of the present invention, the communication control module is a CAN network bus.
In an embodiment of the invention, the current sampling module is a current sampling resistor, and the current sampling resistor is connected in series to a main current loop of the super capacitor bank.
As shown in fig. 2, the energy storage power supply voltage balancing control method of the system according to the embodiment of the present invention includes the following steps:
A1. acquiring voltage, current and temperature data of the super capacitor single bodies in the super capacitor bank, and transmitting the data to a central controller;
A2. judging whether the monomer is in overvoltage or not, if the monomer is in overvoltage, marking the state of the monomer as high alarm by the central controller;
A3. judging whether the monomer is under-voltage or not, if so, marking the state of the monomer as alarm low by the central controller;
A4. judging whether the monomer has overhigh temperature or not, if the monomer has overhigh temperature, marking the state of the monomer as high alarm by the central controller;
A5. calculating the average voltage of all the monomers, and marking the monomer state of the capacitor monomer with the voltage higher than the average value by a certain threshold value as early warning high;
A6. marking the monomer state of the capacitor monomer with the voltage lower than the average value by a certain threshold value as low early warning;
A7. marking the monomer state of the rest capacitor monomers as normal;
A8. the central controller sends out an instruction, a discharge resistance loop is connected to the single body with the high alarm state, the alarm state is transmitted to the display screen, and the air supply quantity in the super capacitor bank is increased;
for the monomer with the early warning high state, a DC/DC voltage reduction circuit is switched on;
turning on a DC/DC booster circuit for the monomer with low early warning state;
A9. and circularly executing the steps A1-A8 until all the capacitor cell voltages are kept within a certain range of the average value, and simultaneously ensuring that no over-temperature cell exists.
The bidirectional DC/DC is used for adjusting the voltage of the monomer in the module, when the voltage of the monomer is too low, the module charges the monomer, when the voltage of the monomer is too high, the monomer reversely charges the module, and when the voltage of the monomer reaches the highest working voltage, the discharge resistors on the anode and the cathode of the monomer are timely connected, so that the purpose of reducing the voltage is achieved. The fuse is used for fusing when the DC/DC circuit or the discharge resistor fails so as to protect the energy storage module.
Claims (4)
1. An energy storage power supply voltage balance control system is characterized by comprising a measuring module, a voltage balance control module, a communication control module and a central controller; the measuring module comprises a current sampling module, a temperature sensor, a voltage measuring device and a first network interface; the current sampling module, the temperature sensor and the voltage measuring device are used for respectively measuring current, temperature and voltage data of all the super capacitor monomers in the super capacitor group to be balanced; the current sampling module is a current sampling resistor, and the current sampling resistor is connected in series into a main current loop of the super capacitor bank; the first network interface transmits the acquired current, temperature and voltage data to the central controller through the communication control module; the central controller comprises a voltage judgment module and a temperature judgment module, and the voltage balance control module comprises a second network interface, a bidirectional DC/DC circuit, a discharge resistor and a fuse; the second network interface receives instructions from the central controller through the communication control module, the bidirectional DC/DC circuit and the discharge resistor are respectively connected with all the super capacitor units through the gating switches, the on and off of the bidirectional DC/DC circuit and the discharge resistor are executed according to the instructions of the central control unit, the bidirectional DC/DC circuit is used for adjusting the voltage of the super capacitor units, and the fuse is used for fusing when the DC/DC circuit or the discharge resistor fails so as to protect the super capacitor units;
the control method of the energy storage power supply voltage balance control system comprises the following steps:
A1. acquiring voltage, current and temperature data of the super capacitor single bodies in the super capacitor bank, and transmitting the data to a central controller;
A2. judging whether the monomer is in overvoltage or not, if the monomer is in overvoltage, marking the state of the monomer as high alarm by the central controller;
A3. judging whether the monomer is under-voltage or not, if so, marking the state of the monomer as alarm low by the central controller;
A4. judging whether the monomer has overhigh temperature or not, if the monomer has overhigh temperature, marking the state of the monomer as high alarm by the central controller;
A5. calculating the average voltage of all the monomers, and marking the monomer state of the capacitor monomer with the voltage higher than the average value by a certain threshold value as early warning high;
A6. marking the monomer state of the capacitor monomer with the voltage lower than the average value by a certain threshold value as low early warning;
A7. marking the monomer state of the rest capacitor monomers as normal;
A8. the central controller sends out an instruction, a discharge resistance loop is connected to the single body with the high alarm state, the alarm state is transmitted to the display screen, and the air supply quantity in the super capacitor bank is increased;
for the monomer with the early warning high state, a DC/DC voltage reduction circuit is switched on;
turning on a DC/DC booster circuit for the monomer with low early warning state;
A9. and circularly executing the steps A1-A8 until the voltages of all the capacitor monomers are kept within a certain range of the average value, and simultaneously ensuring that no monomer with overhigh temperature exists.
2. The system of claim 1, further comprising a display for displaying the alarm signal of the central controller and displaying the current samples.
3. The system of claim 1, further comprising a fan connected to the central controller for supplying air to the interior of the supercapacitor bank.
4. The system of claim 1 wherein the communication control module is a CAN network bus.
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| CN112103575B (en) * | 2020-09-18 | 2021-06-25 | 江苏工程职业技术学院 | Energy storage management system based on dynamic scanning |
| CN116031510B (en) * | 2023-01-11 | 2024-05-17 | 中国铁塔股份有限公司 | Battery equalization method and device and related equipment |
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| CN102122732B (en) * | 2011-01-11 | 2013-10-30 | 启明信息技术股份有限公司 | Method and device for controlling fault tolerance of battery management system of electric automobile |
| CN102664433A (en) * | 2012-03-23 | 2012-09-12 | 东莞新能德科技有限公司 | Cell equalization system based on bidirectional DC/DC |
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