CN114421563A - Super capacitor reverse connection protection device and method for wind power pitch control - Google Patents

Super capacitor reverse connection protection device and method for wind power pitch control Download PDF

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Publication number
CN114421563A
CN114421563A CN202210031610.2A CN202210031610A CN114421563A CN 114421563 A CN114421563 A CN 114421563A CN 202210031610 A CN202210031610 A CN 202210031610A CN 114421563 A CN114421563 A CN 114421563A
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voltage
super capacitor
unit
output
input
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CN114421563B (en
Inventor
黄哲
张春勇
张晴
刘纯斌
张俊
翟飞飞
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Guoneng Information Technology Hebei Co ltd
Guoneng Xinkong Internet Technology Co Ltd
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Guoneng Information Technology Hebei Co ltd
Guoneng Xinkong Internet Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The application discloses wind-powered electricity generation becomes oar and connects anti-protection device and method with super capacitor, the device include be used for super capacitor module voltage acquisition's high voltage acquisition unit and low voltage acquisition unit, be used for keeping apart the relay unit of low voltage acquisition unit and super capacitor module, be used for system control's microcontroller unit, be used for exporting super capacitor wiring state output unit, be used for the power input unit of energy input and be used for the charging unit that super capacitor module charges. This application is through the super capacitor voltage who detects super capacitor module, judges whether super capacitor connects conversely to output super capacitor wiring state to the charging unit, with inform whether charging unit can charge to super capacitor module, with the protection that realizes connecing the inverse state to super capacitor. The application has high detection precision and wide application range, and can detect whether the super capacitor is reversely connected or not even if the super capacitor is stored for a long time, and the system can be protected.

Description

Super capacitor reverse connection protection device and method for wind power pitch control
Technical Field
The invention relates to the technical field of wind power generation, in particular to a super capacitor reverse connection protection device and method for wind power pitch control.
Background
In recent years, with the rapid development of the domestic wind power market, a super capacitor is largely used as a standby power supply in a wind power pitch system. The super capacitor has the advantages of high charging and discharging speed, wide temperature range, long cycle life and the like, and is very suitable for being used in a wind power pitch system. However, the wind power pitch system is not provided with a super capacitor reverse detection function, when the super capacitor is reversely connected, the charging unit of the system still charges the super capacitor, so that the super capacitor is reversely charged, the service life of the super capacitor is influenced, and the safety of a fan is seriously threatened even the life safety of people.
Currently, it is conventional to ensure that the supercapacitor is wired correctly by manually identifying the means that include multimeter measurements or detecting the capacity of the supercapacitor. The manual identification method is easy to cause wiring errors due to human factors, increases uncertainty, has low reliability, and is easy to cause misjudgment due to the particularity of the super capacitor; the mode of detecting the capacity of the super capacitor can judge whether the super capacitor is reversely connected only after the super capacitor is charged for a period of time, the protection action is relatively lagged, and the system cannot be really protected.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a super capacitor reverse connection protection device and method for wind power pitch control.
The invention adopts the following technical scheme.
The super capacitor reverse connection protection device for the wind power pitch control comprises a super capacitor module 20, a power input unit 80 and a charging unit 60;
the protection device also comprises a relay unit 30, a high voltage acquisition unit 10, a low voltage acquisition unit 40, a microcontroller unit 50 and a super capacitor wiring state output unit 70;
the power input unit 80 is connected with two ends of the super capacitor module through the charging unit 60;
the high voltage acquisition unit 10 is connected with two ends of the super capacitor module 20, and transmits voltage acquisition signals at two ends of the super capacitor module 20 to a signal input end of the microcontroller unit 50;
the low voltage acquisition unit 40 is connected to two ends of the super capacitor module 20 through the relay unit 30, the output control end of the microcontroller unit 50 controls the relay unit 30 to be turned off and turned on, when the voltage at two ends of the super capacitor module 20 is lower than a set threshold value, the microcontroller unit 50 controls the relay unit 30 to be turned on, the voltage values at two ends of the super capacitor module 20 are acquired through the low voltage acquisition unit 40, and a voltage acquisition signal is transmitted to the signal input end of the microcontroller unit 50;
the microcontroller unit 50 determines the connection state of the super capacitor through the voltage values at the two ends of the super capacitor module 20, and outputs the connection state to the super capacitor connection state output unit 70, the super capacitor connection state output unit 70 is connected with the control end of the charging unit 60, and the charging unit 60 is controlled to charge the super capacitor module 20 according to the connection state of the super capacitor module 20.
The absolute value of the voltage of the super capacitor of the high-voltage acquisition unit 10 is greater than or equal to the set threshold value VrThe capacitance voltage of the super capacitor module 20 is collected; the low voltage acquisition unit 40 is used for acquiring the absolute value of the capacitor voltage when the absolute value of the capacitor voltage is smaller than the set threshold value VrThe capacitance voltage of the super capacitor module 20 is collected; the relay unit 30 isolates the low voltage collecting unit 40 from the super capacitor module 20.
The set range of the voltage collected by the high voltage collecting unit 10 is 0-450V.
The high-voltage acquisition unit 10 comprises a divider resistor, an isolation amplifier 9, a differential signal to single-ended signal conversion unit 13 and an addition unit 11; the first input end and the second input end of the high voltage acquisition unit 10 are respectively connected with the first output end and the second output end of the super capacitor module 20, the first input end is connected with a first voltage dividing resistor R103, the second input end is connected with a fifth voltage dividing resistor R89, the first voltage dividing resistor R103, the second voltage dividing resistor R95, the third voltage dividing resistor R176, the fourth voltage dividing resistor R80 and the fifth voltage dividing resistor R89 are sequentially connected in series, two ends of the third voltage dividing resistor R176 are connected with the first capacitor C133 in parallel, two ends of the resistor are respectively connected with the differential input ends VIN + and VIN-of the isolation amplifier 9, the output end of the isolation amplifier 9 is connected with the differential signal to single-ended signal conversion unit 13, the differential signal to single-ended signal conversion unit 13 takes the differential signals VOUT + and VOUT-output by the isolation amplifier 9 as input, the single-ended signal is used as output, the adding unit 11 uses the single-ended signal as input, and uses the positive signal as output;
the output voltage of the super capacitor module 20 is divided and collected by the divider resistor of the high voltage collecting unit 10 and then input to the isolation amplifier 9, the differential signal output by the isolation amplifier 9 is converted into a single-ended signal by the differential signal to single-ended signal converting unit 13, and then converted into a positive signal by the adding unit 11 and input to the microcontroller unit 50.
The low-voltage acquisition unit 40 comprises a divider resistor, a precision amplifier 12 and an addition unit 11;
the first input end of the low-voltage acquisition unit 40 is connected IN series with a sixth voltage-dividing resistor R117 and then connected with a differential input end IN-of the precision amplifier 12, wherein the sixth voltage-dividing resistor R117 is connected IN series with a seventh voltage-dividing resistor R102, and two ends of the seventh voltage-dividing resistor R102 are connected IN parallel with a second capacitor C100; the second input end of the voltage acquisition unit is connected IN series with a ninth voltage-dividing resistor R90 and then connected with the differential input end IN + of the precision amplifier 12, wherein the ninth voltage-dividing resistor R90 is connected IN series with a tenth voltage-dividing resistor R83, and two ends of the tenth voltage-dividing resistor R83 are connected IN parallel with a third capacitor C93.
The multiple amplifying pin RG1 and the multiple amplifying pin RG2 of the precision amplifier 12 are connected with an amplifying resistor R91 to set the amplification factor.
The precision amplifier 12 takes the output voltage of the super capacitor module 20 acquired by the voltage division of the ninth voltage dividing resistor R90, the tenth voltage dividing resistor R83, the seventh voltage dividing resistor R102 and the sixth voltage dividing resistor R117 as input, and takes the amplified voltage signal as output, the output end of the precision amplifier 12 is connected in series with the filter resistor R85 and then connected with the input end of the addition unit 11, wherein the filter resistor R85 is connected in series with the filter capacitor C95, and the filter resistor R85 and the filter capacitor C95 filter the voltage signal output by the precision amplifier 12; the adding unit 11 takes the filtered voltage signal as an input and takes the positive signal as an output.
The relay unit 30 is a double pole relay.
The microcontroller unit 50 outputs the wiring state: when the collected voltage of the super capacitor is positive, the connection state is that the connection of the super capacitor is normal; when the collected voltage of the super capacitor is negative, the connection state is that the super capacitor is reversely connected.
The power input unit 80 is any one of three-phase alternating current input, single-phase alternating current input, and direct current power input; the charging unit 60 is an ac input dc output or a dc input dc output.
A super capacitor reverse connection protection method for wind power pitch control is characterized by comprising the following steps:
s1, electrifying the wind power variable pitch system;
s2, the high voltage collecting unit 10 collects the super capacitor voltage from the positive electrode to the negative electrode of the super capacitor module 20 at the time of power-on, and the microcontroller unit 50 detects the super capacitor voltage;
s3, the microcontroller unit 50 determines whether the absolute value of the voltage of the super capacitor collected in the step S2 is larger than or equal to the set threshold value VrIf yes, go to step S6, if no, continue to step S4;
s4, the microcontroller unit 50 controls the relay unit 30 to close;
s5, the low voltage collecting unit 40 collects the super capacitor voltage from the positive electrode to the negative electrode of the super capacitor module 20 at the time of power-on, and the microcontroller unit 50 detects the super capacitor voltage;
s6, the microcontroller unit 50 judges the connection state of the super capacitor according to the positive and negative of the detected voltage of the super capacitor, and when the collected voltage of the super capacitor is positive, the connection of the super capacitor is normal; when the collected voltage of the super capacitor is negative, the super capacitor is reversely connected; the microcontroller unit 50 outputs the wiring state to the super capacitor wiring state output unit 70.
The micro controller unit 50 performs reverse connection state detection on the super capacitor at the power-on time of the wind power pitch system, and performs reverse connection state detection only once when the wind power pitch system is powered on.
Threshold value VrIs within the detection range of the low voltage collecting unit 40, and the threshold value VrAt least 3 times the detection accuracy of the high voltage acquisition unit 10.
Compared with the prior art, the invention has the advantages that the method adopts a mode of combining high-voltage acquisition and low-voltage acquisition, has high detection precision and wide application range, can detect whether the super capacitor is reversely connected or not even if the super capacitor is stored for a long time, and can protect the system. The device and the method can complete detection when the system is powered on, and the charging process does not exist when the super capacitor is reversely connected, so that the system can be more fully protected. What is particularly important is that the reverse charging of the super capacitor in reverse connection can be avoided, and the safety of the fan and the safety of operators are greatly improved.
Drawings
FIG. 1 is a block diagram of a super capacitor reverse protection device according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a high voltage acquisition unit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a low voltage acquisition unit according to an embodiment of the present application;
fig. 4 is a flowchart of a supercapacitor reverse protection method according to an embodiment of the present application.
The labels in the figure are:
10. a high voltage acquisition unit;
20. a super capacitor module;
30. a relay unit;
40. a low voltage acquisition unit;
50. a microcontroller unit;
60. a charging unit;
70. a super capacitor wiring state output unit;
80. a power input unit;
9. an isolation amplifier;
11. an adding unit;
12. a precision amplifier.
13. A differential signal to single-ended signal unit;
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic block diagram of a supercapacitor reverse connection protection device and method for a wind power pitch control, where the supercapacitor for the wind power pitch control is a supercapacitor module 20. The wind power pitch-variable supercapacitor reverse connection protection device comprises a relay unit 30, a supercapacitor module 20, a high-voltage acquisition unit 10, a low-voltage acquisition unit 40, a microcontroller unit 50, a supercapacitor wiring state output unit 70, a power input unit 80 and a charging unit 60.
The charging unit 60 is connected with the power input unit 80 and the super capacitor wiring state output unit 70, and the outputs of the charging unit are respectively connected with the two ends of the super capacitor module 20; the input end of the high voltage acquisition unit 40 is respectively connected with two ends of the super capacitor module 20, and the output end thereof is connected with the microcontroller unit 50; the input of the relay unit 30 is connected with the super capacitor module 20, and the output thereof is connected with the input end of the low voltage acquisition unit 40; the output end of the low voltage acquisition unit 40 is connected with the microcontroller unit 50.
The high voltage acquisition unit 10 and the low voltage acquisition unit 40 are used for acquiring the voltage of the super capacitor module 20, and specifically, the absolute value of the voltage of the super capacitor of the high voltage acquisition unit 10 is greater than or equal to the set threshold value VrCollecting the super capacitor voltage of the super capacitor module; the absolute value of the voltage of the super capacitor of the low-voltage acquisition unit 40 is smaller than the set threshold value VrCollecting the super capacitor voltage of the super capacitor module; the relay unit 30 is used for isolating the low-voltage acquisition unit 40 and the super capacitor module 20, the microcontroller unit 50 is used for system control, and the super capacitor wiring state output unit 70 is used for outputting the super capacitor wiring state.
The wind power pitch-variable supercapacitor reverse connection protection device judges whether the supercapacitor is reversely connected or not by detecting the supercapacitor voltage of the supercapacitor module 20, and outputs the supercapacitor wiring state to the charging unit 60 through the supercapacitor wiring state output unit 70 so as to inform the charging unit 60 whether the supercapacitor module 20 can be charged or not, so that the supercapacitor reverse connection protection is realized.
The scheme is mainly applied to occasions adopting the super capacitor as the standby power supply in the wind power pitch control system, and is also suitable for other occasions adopting the super capacitor as the standby power supply in the wind power generation system, such as a wind power yaw system and the like. The scheme can also be applied to other occasions adopting the super capacitor as a standby power supply.
The absolute value of the voltage of the super capacitor of the high-voltage acquisition unit 10 is greater than or equal to the set threshold value VrThe capacitance voltage of the super capacitor module 20 is collected; the low voltage acquisition unit 40 is used for acquiring the absolute value of the capacitor voltage when the absolute value of the capacitor voltage is smaller than the set threshold value VrThe capacitance voltage of the super capacitor module 20 is collected; the relay unit 30 isolates the low voltage collecting unit 40 from the super capacitor module 20.
The set range of the voltage collected by the high voltage collecting unit 10 is 0-450V.
The high-voltage acquisition unit 10 comprises a divider resistor, an isolation amplifier 9, a differential signal to single-ended signal conversion unit 13 and an addition unit 11; the first input end and the second input end of the high voltage acquisition unit 10 are respectively connected with the first output end and the second output end of the super capacitor module 20, the first input end is connected with a first voltage dividing resistor R103, the second input end is connected with a fifth voltage dividing resistor R89, the first voltage dividing resistor R103, the second voltage dividing resistor R95, the third voltage dividing resistor R176, the fourth voltage dividing resistor R80 and the fifth voltage dividing resistor R89 are sequentially connected in series, two ends of the third voltage dividing resistor R176 are connected with the first capacitor C133 in parallel, two ends of the resistor are respectively connected with the differential input ends VIN + and VIN-of the isolation amplifier 9, the output end of the isolation amplifier 9 is connected with the differential signal to single-ended signal conversion unit 13, the differential signal to single-ended signal conversion unit 13 takes the differential signals VOUT + and VOUT-output by the isolation amplifier 9 as input, the single-ended signal is used as an output, and the adding unit 11 uses the single-ended signal as an input and uses the positive signal as an output.
The output voltage of the super capacitor module 20 is divided and collected by the divider resistor of the high voltage collecting unit 10 and then input to the isolation amplifier 9, the differential signal output by the isolation amplifier 9 is converted into a single-ended signal by the differential signal to single-ended signal converting unit 13, and then converted into a positive signal by the adding unit 11 and input to the microcontroller unit 50.
As shown in fig. 2, the input end of the high voltage collecting unit 10 is connected to the first output end VC1 and the second output end VC2 of the super capacitor module 20, respectively, the input end of the high voltage collecting unit 10 receives the output voltage of the super capacitor module 20, the voltage is divided and collected by the first voltage dividing resistor R103, the second voltage dividing resistor R95, the third voltage dividing resistor R176, the fourth voltage dividing resistor R80, and the fifth voltage dividing resistor R89 of the high voltage collecting unit 10, and then is input to the differential input ends VIN + and VIN of the isolation amplifier 9, and a person skilled in the art can select the type of the isolation amplifier according to experience, where the type of the isolation amplifier 9 is HCPL-7840 in this embodiment, the differential signal VOUT +/VOUT output by the isolation amplifier HCPL-7840 is converted into a single-ended signal by the differential signal to single-ended signal converting unit 13, and then is converted into a positive signal U _ DC1 by the adding unit 11, and then is input to the microcontroller unit 50 for collection, the adding unit 11 includes a voltage constant of 1.5V, and the adding unit 11 combines the voltage constant with the single-ended signal output by the differential signal to single-ended signal unit 13 and converts the combined voltage constant into a positive signal, that is, the output signal is shifted up by 1.5V. The differential to single ended signal unit 13 and the adding unit 11 are conventional circuits.
The relay unit 30 is a double-pole relay, the input of which is respectively connected with two ends of the super capacitor module 20, and the output of which is respectively connected with the input end of the low voltage acquisition unit 40; the relay unit 30 coil is controlled by the microcontroller unit 50.
The low-voltage acquisition unit 40 comprises a divider resistor, a precision amplifier 12 and an addition unit 11;
the first input end of the low-voltage acquisition unit 40 is connected IN series with a sixth voltage-dividing resistor R117 and then connected with a differential input end IN-of the precision amplifier 12, wherein the sixth voltage-dividing resistor R117 is connected IN series with a seventh voltage-dividing resistor R102, and two ends of the seventh voltage-dividing resistor R102 are connected IN parallel with a second capacitor C100; the second input end of the voltage acquisition unit is connected with the differential input end IN + of the precision amplifier 12 after being connected with a ninth voltage-dividing resistor R90 IN series, wherein the ninth voltage-dividing resistor R90 is connected with a tenth voltage resistor R83 IN series, and two ends of the tenth voltage resistor R83 are connected with a third capacitor C93 IN parallel;
the multiple amplifying pin RG1 and the multiple amplifying pin RG2 of the precision amplifier 12 are connected with an amplifying resistor R91 to set the amplification factor.
The precision amplifier 12 takes the output voltage of the super capacitor module 20 acquired by the voltage division of the ninth voltage dividing resistor R90, the tenth voltage dividing resistor R83, the seventh voltage dividing resistor R102 and the sixth voltage dividing resistor R117 as input, and takes the amplified voltage signal as output, the output end of the precision amplifier 12 is connected in series with the filter resistor R85 and then connected with the input end of the addition unit 11, wherein the filter resistor R85 is connected in series with the filter capacitor C95, and the filter resistor R85 and the filter capacitor C95 filter the voltage signal output by the precision amplifier 12; the adding unit 11 takes the filtered voltage signal as an input and takes the positive signal as an output.
As shown IN fig. 3, the input end of the low voltage collecting unit 40 is respectively connected to the super capacitor voltage UC1 and the super capacitor voltage UC2 output by the relay unit 30, and the output voltage of the relay unit 30 is divided by the ninth voltage dividing resistor R90, the tenth voltage dividing resistor R83, the seventh voltage dividing resistor R102, and the sixth voltage dividing resistor R117 and then input to the differential input ends IN + and IN-of the precision amplifier 12. The amplification of the precision amplifier 12 is set by an amplifying resistor R91, for example, the amplification is set to 10 times. The precision amplifier 12 of the present embodiment is of type INA114, and the multiple amplification pin RG1 and the multiple amplification pin RG2 are connected to the amplification resistor R91 to set the amplification factor. The output signal of the precision amplifier 12 is filtered by the filter resistor R85 and the filter capacitor C95, and then converted into a positive signal U _ DC2 by the adding unit 11, and the positive signal U _ DC2 is input to the microcontroller unit 50 for collection, the adding unit 11 includes a voltage constant of 1.5V, and the voltage constant and the output signal of the precision amplifier 12 are combined by the adding unit 11 and converted into a positive signal, that is, the output signal is shifted up by 1.5V.
Preferably, the microcontroller unit 50 determines the connection state of the super capacitor according to the voltage value of the super capacitor, and outputs the connection state to the super capacitor connection state output unit 70, and specifically, the microcontroller unit 50 determines the connection state of the super capacitor according to the collected positive and negative voltages of the super capacitor module 20 at the power-on time, and outputs the connection state to the super capacitor connection state output unit 70. When the collected voltage of the super capacitor is positive, the wiring of the super capacitor is normal; and when the collected voltage of the super capacitor is negative, the super capacitor is reversely connected.
Preferably, the super capacitor wiring state output unit 70 is responsible for outputting the super capacitor wiring state information output by the microcontroller unit 50 to the charging unit 60 to control the charging unit 60 to charge the super capacitor module 20. The output mode of the super capacitor wiring state output unit 70 may be a DO or dry contact type, or a software communication mode, such as a CAN communication mode, and specifically needs to be used in cooperation with the charging unit 60. The wiring state output unit 70 receives a signal from the microcontroller unit 50 that the wiring of the super capacitor is normal, and outputs a charging command to the charging unit, and the charging unit 60 charges the super capacitor module; the connection state output unit 70 receives the signal of the reverse connection of the super capacitor from the micro controller unit 50, and controls the charging unit 60 to stop charging the super capacitor. In addition, the charging unit 60 manages the charging of the super capacitor, and stops charging when the super capacitor is full and recharges when the super capacitor is under power. The charging unit 60 is connected to the power input unit 80 and the super capacitor connection state output unit 70, and outputs thereof are respectively connected to two ends of the super capacitor module 20. Preferably, the power input unit 80 may be an ac power input or a dc power input. The input of the alternating current power supply can be three-phase alternating current input or single-phase alternating current input. Accordingly, the charging unit 60 may be an ac input dc output or a dc input dc output. The charging unit 60 receives the super capacitor wiring state signal from the super capacitor wiring state output unit 70, and determines whether the super capacitor module 20 can be charged.
The invention also provides an anti-reverse protection method based on the super capacitor anti-reverse protection device for wind power pitch control, as shown in a flow chart of a second embodiment of the application in fig. 4, the method comprises the following steps:
s1, electrifying the wind power variable pitch system;
s2, the high voltage collecting unit 10 collects the super capacitor voltage from the positive electrode to the negative electrode of the super capacitor module 20 at the time of power-on, and the microcontroller unit 50 detects the super capacitor voltage;
s3, the microcontroller unit 50 determines whether the absolute value of the voltage of the super capacitor collected in the step S2 is larger than or equal to the set threshold value VrIf yes, go to step S6, if no, continue to step S4;
s4, the microcontroller unit 50 controls the relay unit 30 to close;
s5, the low voltage collecting unit 40 collects the super capacitor voltage from the positive electrode to the negative electrode of the super capacitor module 20 at the time of power-on, and the microcontroller unit 50 detects the super capacitor voltage;
s6, the microcontroller unit 50 judges the connection state of the super capacitor according to the positive and negative of the detected voltage of the super capacitor, and when the collected voltage of the super capacitor is positive, the connection of the super capacitor is normal; when the collected voltage of the super capacitor is negative, the super capacitor is reversely connected; the microcontroller unit 50 outputs the wiring state to the super capacitor wiring state output unit 70.
Preferably, the system performs the reverse state detection of the super capacitor immediately upon power-up, and is performed only once upon power-up of the system.
Preferably, when the absolute value of the voltage of the super capacitor is greater than or equal to a set threshold value VrThen, the high voltage acquisition unit 10 is adopted to detect the voltage of the super capacitor; when the absolute value of the voltage of the super capacitor is smaller than a set threshold value VrIn the process, the relay unit 30 is closed, and the low-voltage acquisition unit 40 is adopted to detect the voltage of the super capacitor, so that the detection precision is improved.
The high voltage acquisition unit 10 can adapt to the super capacitor voltage of the full setting range without damage, and preferably, the voltage setting range is 0-450V; the relay unit 30 is closed only when the low-voltage acquisition unit 40 is used for detecting the voltage of the super capacitor, and is opened in other time, so that the low-voltage acquisition unit 40 is prevented from being damaged due to the fact that the detected voltage of the super capacitor is high.
Preferably, the system firstly adopts the high voltage acquisition unit 10 to detect the voltage of the super capacitor when being powered on, and only when the absolute value of the detection result of the high voltage acquisition unit 10 is smaller than the set threshold value VrThen, the low voltage acquisition unit 40 is used to detect the supercapacitor voltage.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.

Claims (11)

1. The super capacitor reverse connection protection device for the wind power pitch control comprises a super capacitor module (20), a power input unit (80) and a charging unit (60); it is characterized in that the preparation method is characterized in that,
the protection device further comprises a relay unit (30), a high-voltage acquisition unit (10), a low-voltage acquisition unit (40), a microcontroller unit (50) and a super capacitor wiring state output unit (70);
the power input unit (80) is connected with two ends of the super capacitor module through the charging unit (60);
the high-voltage acquisition unit (10) is connected with two ends of the super capacitor module (20) and transmits voltage acquisition signals at the two ends of the super capacitor module (20) to a signal input end of the microcontroller unit (50);
the low-voltage acquisition unit (40) is connected to two ends of the super capacitor module (20) through the relay unit (30), the output control end of the microcontroller unit (50) controls the switching-off and switching-on of the relay unit (30), when the voltage at two ends of the super capacitor module (20) is lower than a set threshold value, the microcontroller unit (50) controls the switching-on and switching-off of the relay unit (30), the voltage values at two ends of the super capacitor module (20) are acquired through the low-voltage acquisition unit (40), and voltage acquisition signals are transmitted to the signal input end of the microcontroller unit (50);
the method is characterized in that the microcontroller unit (50) judges the wiring state of the super capacitor through voltage values at two ends of the super capacitor module (20) and outputs the wiring state to the super capacitor wiring state output unit (70), the super capacitor wiring state output unit (70) is connected with the control end of the charging unit (60), and the charging unit (60) is controlled to charge the super capacitor module (20) according to the wiring state of the super capacitor module (20).
2. The super capacitor reverse connection protection device for wind power pitch control according to claim 1,
the absolute value of the voltage of the super capacitor of the high-voltage acquisition unit (10) is more than or equal to a set threshold value VrThe capacitance voltage of the super capacitor module (20) is collected; the low voltage acquisition unit (40) is used for acquiring the voltage when the absolute value of the capacitor voltage is smaller than the set threshold value VrThe capacitance voltage of the super capacitor module (20) is collected; the relay unit (30) isolates the low-voltage acquisition unit (40) from the super capacitor module (20).
3. The super capacitor reverse connection protection device for wind power pitch control according to claim 1 or 2,
the set range of the voltage collected by the high-voltage collecting unit (10) is 0-450V.
4. The super capacitor reverse connection protection device for wind power pitch control according to claim 3,
the high-voltage acquisition unit (10) comprises a divider resistor, an isolation amplifier (9), a differential signal to single-ended signal conversion unit (13) and an addition unit (11); the first input end and the second input end of the high-voltage acquisition unit (10) are respectively connected with a first output end and a second output end of the super capacitor module (20), the first input end is connected with a first voltage-dividing resistor (R103), the second input end is connected with a fifth voltage-dividing resistor (R89), the first voltage-dividing resistor (R103), the second voltage-dividing resistor (R95), the third voltage-dividing resistor (R176), the fourth voltage-dividing resistor (R80) and the fifth voltage-dividing resistor (R89) are sequentially connected in series, two ends of the third voltage-dividing resistor (R176) are connected with the first capacitor (C133) in parallel, two ends of the rear resistor are respectively connected with a differential input end VIN + and VIN of the isolation amplifier (9), the output end of the isolation amplifier (9) is connected with a differential signal-to-single-end signal conversion unit (13), the differential signal to-single-end signal conversion unit (13) takes differential signals VOUT + and VOUT-output by the isolation amplifier (9) as input, the single-ended signal is used as output, the addition unit (11) uses the single-ended signal as input, and the positive signal is used as output;
the output voltage of the super capacitor module (20) is input into the isolation amplifier (9) after being subjected to voltage division acquisition by a divider resistor of the high-voltage acquisition unit (10), a differential signal output by the isolation amplifier (9) is converted into a single-ended signal through the differential signal to single-ended signal unit (13), and the single-ended signal is converted into a positive signal through the addition unit (11) and input into the microcontroller unit (50).
5. The super capacitor reverse connection protection device for wind power pitch control according to claim 1,
the low-voltage acquisition unit (40) comprises a divider resistor, a precision amplifier (12) and an addition unit (11);
the first input end of the low-voltage acquisition unit (40) is connected with the differential input end IN-of the precision amplifier (12) after being connected with a sixth voltage-dividing resistor (R117) IN series, wherein the sixth voltage-dividing resistor (R117) is connected with a seventh voltage-dividing resistor (R102) IN series, and two ends of the seventh voltage-dividing resistor (R102) are connected with a second capacitor (C100) IN parallel; the second input end of the voltage acquisition unit is connected with a ninth divider resistor (R90) IN series and then is connected with a differential input end IN + of the precision amplifier (12), wherein the ninth divider resistor (R90) is connected with a tenth voltage resistor (R83) IN series, and two ends of the tenth voltage resistor (R83) are connected with a third capacitor (C93) IN parallel;
a multiple amplification pin (RG1) and a multiple amplification pin (RG2) of the precision amplifier (12) are connected with an amplification resistor (R91) to set amplification factors;
the precision amplifier (12) takes the output voltage of the super capacitor module (20) acquired by the voltage division of the ninth voltage dividing resistor (R90), the tenth voltage dividing resistor (R83), the seventh voltage dividing resistor (R102) and the sixth voltage dividing resistor (R117) as input, takes the amplified voltage signal as output, and the output end of the precision amplifier (12) is connected with the input end of the addition unit (11) after being connected with the filter resistor (R85) in series, wherein the filter resistor (R85) is connected with the filter capacitor (C95) in series, and the filter resistor (R85) and the filter capacitor (C95) filter the voltage signal output by the precision amplifier (12); the addition unit (11) takes the filtered voltage signal as an input and takes the positive signal as an output.
6. The super capacitor reverse connection protection device for wind power pitch control according to claim 1,
the relay unit (30) is a double pole relay.
7. The super capacitor reverse connection protection device for wind power pitch control according to claim 1,
the microcontroller unit (50) outputs a wiring state: when the collected voltage of the super capacitor is positive, the connection state is that the connection of the super capacitor is normal; when the collected voltage of the super capacitor is negative, the connection state is that the super capacitor is reversely connected.
8. The super capacitor reverse connection protection device for wind power pitch control according to claim 1,
the power input unit (80) is any one of three-phase alternating current input, single-phase alternating current input and direct current power input; the charging unit (60) is an AC-input-DC-output or a DC-input-DC-output.
9. The method for protecting the reverse connection of the supercapacitor for the wind power pitch control based on the supercapacitor for the wind power pitch control reverse connection protection device of claims 1 to 8 is characterized by comprising the following steps of:
s1, electrifying the wind power variable pitch system;
s2, the high-voltage acquisition unit (10) acquires the super-capacitor voltage from the anode to the cathode of the super-capacitor module (20) at the power-on moment, and the microcontroller unit (50) detects the super-capacitor voltage;
s3, the microcontroller unit (50) judges whether the absolute value of the super capacitor voltage acquired in the step S2 is larger than or equal to the set threshold value VrIf yes, go to step S6, if no, continue to step S4;
s4, the microcontroller unit (50) controls the relay unit (30) to close;
s5, the low voltage acquisition unit (40) acquires the super capacitor voltage from the positive electrode to the negative electrode of the super capacitor module (20) at the power-on moment, and the microcontroller unit (50) detects the super capacitor voltage;
s6, the microcontroller unit (50) judges the connection state of the super capacitor according to the positive and negative of the detected voltage of the super capacitor, and when the collected voltage of the super capacitor is positive, the connection of the super capacitor is normal; when the collected voltage of the super capacitor is negative, the super capacitor is reversely connected; the microcontroller unit (50) outputs the wiring state to the super capacitor wiring state output unit (70).
10. The supercapacitor reverse connection protection method for wind power pitch control according to claim 9,
the micro-controller unit (50) performs reverse connection state detection on the super capacitor at the power-on moment of the wind power variable pitch system, and performs reverse connection state detection only once when the wind power variable pitch system is powered on.
11. The supercapacitor reverse connection protection method for wind power pitch control according to claim 9,
the threshold value VrIs within the detection range of the low voltage acquisition unit (40), and a threshold value VrIs at least 3 times of the detection precision of the high voltage acquisition unit (10).
CN202210031610.2A 2022-01-12 2022-01-12 Super capacitor reverse connection protection device and method for wind power variable pitch Active CN114421563B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130074692A (en) * 2011-12-26 2013-07-04 주식회사 우진산전 Device of improving ac power quality with super capacitor(edlc)
CN103683420A (en) * 2013-12-13 2014-03-26 惠州市亿能电子有限公司 Voltage balancing circuit of series-connected super-capacitor module of electric automobile
CN204416995U (en) * 2015-02-05 2015-06-24 成都坤宝石油科技有限公司 A kind of service machine power management system
CN105406569A (en) * 2015-12-25 2016-03-16 谢镕安 Intelligent charging system of super-capacitor blade electric vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130074692A (en) * 2011-12-26 2013-07-04 주식회사 우진산전 Device of improving ac power quality with super capacitor(edlc)
CN103683420A (en) * 2013-12-13 2014-03-26 惠州市亿能电子有限公司 Voltage balancing circuit of series-connected super-capacitor module of electric automobile
CN204416995U (en) * 2015-02-05 2015-06-24 成都坤宝石油科技有限公司 A kind of service machine power management system
CN105406569A (en) * 2015-12-25 2016-03-16 谢镕安 Intelligent charging system of super-capacitor blade electric vehicle

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