CN111799987A - Direct-current bus voltage acquisition circuit and method for 10kV high-voltage frequency conversion integrated machine - Google Patents
Direct-current bus voltage acquisition circuit and method for 10kV high-voltage frequency conversion integrated machine Download PDFInfo
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- CN111799987A CN111799987A CN202010580342.0A CN202010580342A CN111799987A CN 111799987 A CN111799987 A CN 111799987A CN 202010580342 A CN202010580342 A CN 202010580342A CN 111799987 A CN111799987 A CN 111799987A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
Abstract
The invention relates to a direct-current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, which consists of a main control board, a power supply module and N voltage acquisition communication boards, wherein the N voltage acquisition communication boards are used for respectively acquiring direct-current voltages at the input sides of N inversion units; the main control board is communicated with the head end voltage acquisition communication board and the two adjacent voltage acquisition communication boards through optical fibers, each voltage acquisition communication board is provided with a high-frequency magnetic ring power supply unit for supplying power to the voltage acquisition communication board, and the power supply module supplies power to each voltage acquisition communication board through a 10kV voltage-resistant cable. According to the direct-current bus voltage acquisition circuit and the direct-current bus voltage acquisition method, the power supply module supplies power to each voltage acquisition communication board through the 10kV voltage-resistant cable penetrating through the high-frequency magnetic ring power supply unit, so that high-voltage isolation of a power supply loop between the power supply module and each voltage acquisition communication board and between the power supply modules and the voltage acquisition communication boards is realized, and the problem that the power supply for the voltage acquisition circuit is difficult at present is solved.
Description
Technical Field
The invention relates to a direct current bus voltage acquisition circuit and a direct current bus voltage acquisition method, in particular to a direct current bus voltage acquisition circuit and a direct current bus voltage acquisition method for a 10kV high-voltage frequency conversion all-in-one machine.
Background
At present, a 10kV high-voltage frequency conversion all-in-one machine adopts a novel topological structure for smaller size and higher electric energy conversion efficiency. The novel topological structure comprises an input reactor, a rectifying unit, a direct current bus filter, a plurality of inversion units connected in series and a multi-input-end motor. A10 kV high-voltage power is introduced into an input reactor from a power grid, the input reactor is connected to the input of a rectifying unit, the direct-current bus voltage is obtained after rectification of the rectifying unit, the direct-current voltage is filtered through a direct-current bus and then connected to inverters formed by connecting a plurality of inverting units in series, the output of each inverting unit is connected to the power input end of a motor with multiple input ends, and therefore the electrical topological structure of the 10kV high-voltage variable-frequency motor all-in-one machine is formed.
The direct current bus is connected to a plurality of inversion units which are connected in series after filtering, and the whole high-voltage bus is divided into a plurality of direct current buses which are connected in series. Because of the working inconsistency of each inversion unit, the load inconsistency and other reasons, the non-voltage-sharing phenomenon can occur in the series-connected direct current buses, and the operation of the whole machine is influenced, so that the series-connected direct current buses are required to be respectively collected and uploaded to a main control system, and voltage-sharing control is realized through the main control system.
After the 10kV grid voltage is rectified, the direct current bus is about 14140V, the number of the series-connected inverters is generally within 5, for example, 4 inverters are connected in series, and a single direct current bus 3535V is formed after voltage division in series. When the design must consider 1.2 times of overvoltage, a single direct current bus reaches 4242V, and the whole bus reaches 16968V after 4 buses are connected in series. In order to ensure the safety of the main control system and operators, the voltage of each direct current bus connected in series is collected, and high-voltage isolation must be realized between the voltage of each direct current bus and the main control system and between the voltage of each direct current bus and the shell. Because the direct current buses are in series connection, the acquisition units or modules of the direct current bus voltages are also isolated from each other by high voltage. In addition, because the voltage of the direct current bus is too high, the acquisition unit or the module is difficult to be supplied with power from the direct current bus through the DC/DC conversion circuit.
Disclosure of Invention
The invention provides a direct current bus voltage acquisition circuit and a direct current bus voltage acquisition method for a 10kV high-voltage frequency conversion all-in-one machine, aiming at overcoming the defects of the technical problems.
The invention relates to a direct current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, wherein the 10kV high-voltage frequency conversion all-in-one machine consists of an input reactor, a rectification unit, N inversion units and a multi-winding motor, the alternating current input end of the rectification unit is connected to 10kV alternating current through the input reactor, the output end of the rectification unit forms direct current bus voltage, the two ends of the N inversion units which are connected in series are connected to the direct current bus voltage, and the input end of each inversion unit is connected with a direct current bus filter capacitor; the direct current bus voltage acquisition circuit consists of a main control board, a power supply module and N voltage acquisition communication boards, wherein the N voltage acquisition communication boards are used for respectively acquiring direct current voltages at the input sides of the N inversion units; the method is characterized in that: the main control board is communicated with the head end voltage acquisition communication board and the two adjacent voltage acquisition communication boards through optical fibers to form a series communication loop, each voltage acquisition communication board is provided with a high-frequency magnetic ring power supply unit for supplying power to the voltage acquisition communication board, a 10kV voltage-resistant cable penetrating through the high-frequency magnetic ring power supply unit is arranged on the power supply module, and the power supply module supplies power to each voltage acquisition communication board by introducing a low-voltage high-frequency signal to the 10kV voltage-resistant power supply cable; and the voltage acquisition communication board transmits the acquired direct current bus voltage to the main control board in a time-division multiplexing communication mode.
The invention relates to a direct-current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, wherein a voltage acquisition communication board consists of a voltage attenuation circuit, an A/D conversion circuit, a digital coding circuit, an optical fiber communication receiving circuit and an optical fiber communication transmitting circuit, the input end of the voltage attenuation circuit is connected to the direct-current bus voltage at the input side of an inversion unit, and the output end of the voltage attenuation circuit is connected with the input end of the A/D conversion circuit; the output end of the A/D conversion circuit is connected with the digital coding circuit; the input end of the optical fiber communication receiving circuit is connected with the output end of the rear-end adjacent voltage acquisition communication board through an optical fiber, the output end of the optical fiber communication receiving circuit is connected with the digital coding circuit, the input end of the optical fiber communication transmitting circuit is connected with the output end of the digital coding circuit, and the output end of the optical fiber communication transmitting circuit is connected with the input end of the front-end adjacent voltage acquisition communication board or the main control board.
The invention relates to a direct current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, wherein a high-frequency magnetic ring power supply unit consists of a high-frequency magnetic ring, a secondary winding and a rectification, filtering and voltage stabilizing circuit, a 10kV voltage-resistant cable penetrates through an inner cavity of the high-frequency magnetic ring, the secondary winding is wound on the high-frequency magnetic ring and is connected to the input end of the rectification, filtering and voltage stabilizing circuit, the rectification, filtering and voltage stabilizing circuit rectifies, filters and stabilizes alternating current input by the secondary winding to convert the alternating current into direct current, and the direct current supplies power to a voltage attenuation circuit, an A/D conversion circuit, a.
The invention discloses a voltage acquisition method of a direct-current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, which is characterized by comprising the following steps of:
a) the serial communication circuit comprises communication board numbers, wherein each voltage acquisition communication board in the serial communication circuit has different address numbers, the address number of the 1 st voltage acquisition communication board connected with a main control board through an optical fiber is 1, the address number of the 2 nd voltage acquisition communication board is 2, and by analogy, the address number of the voltage acquisition communication board at the tail end of the serial communication circuit is N;
each voltage acquisition communication board synchronously uploads the acquired direct current bus voltage in a time-sharing multiplexing communication mode, each voltage acquisition communication board comprises a data forwarding state and a bus voltage sending state, only one voltage acquisition communication board is in the bus voltage sending state at the same time, and other voltage acquisition communication boards are in the data forwarding state;
b) sending a voltage of a tail-end communication board, periodically entering a bus voltage sending state by a voltage acquisition communication board with the tail end of a serial communication loop and an address number of N, and sending a serial coding signal by an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N of the voltage acquisition communication board, the acquired direct-current bus voltage and verification data;
c) after the voltage transmission of the communication board with the serial number of N-1 is detected, the voltage acquisition communication board with the address number of N-1 is switched to a bus voltage transmission state from a data forwarding state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-1 of the voltage acquisition communication board, acquired direct current bus voltage and verification data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after the transmission is finished;
d) after the voltage transmission of the communication board with the serial number of N-2 and the voltage acquisition communication board with the address number of N-2 are detected, the voltage acquisition communication board is switched from a data forwarding state to a bus voltage transmission state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-2 of the voltage acquisition communication board, the acquired direct-current bus voltage, verification data and the like, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after being transmitted;
e) voltage sending of the other communication boards is performed in the manner of the step c) and the step d), finally, the voltage acquisition communication board with the address number of 1 is switched from the data forwarding state to the bus voltage sending state after the serial coding signal with the address number of 2 is detected to be sent, the serial coding signal is sent through the optical fiber communication transmitting circuit, the serial coding signal comprises the address number of 1 of the voltage acquisition communication board, the acquired direct current bus voltage and the check data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage sending state after being sent;
f) uploading the new round of data, and sequentially uploading the respective serial coding signals once by the voltage acquisition communication boards in the serial communication loop through the steps b) to e); the periodic timing time of the voltage acquisition communication board with the address number of N is longer than the time for uploading serial coding signals by all the voltage acquisition communication boards, and a new round of data uploading is started after the timing time is up, so that the voltage of each group of buses is uploaded and acquired by all the voltage acquisition communication boards in a time-sharing and optical fiber channel multiplexing mode.
The invention has the beneficial effects that: according to the direct-current bus voltage acquisition circuit and the direct-current bus voltage acquisition method for the 10kV high-voltage frequency conversion all-in-one machine, optical fiber communication is adopted between the main control board and the voltage acquisition communication board and between the voltage acquisition communication boards to form a series communication loop, so that the communication loop is simplified, high-voltage isolation between the voltage acquisition communication boards and between the main control board (the frequency conversion all-in-one machine main control board) and the voltage acquisition communication boards is realized, and the main control board and the voltage acquisition communication boards are effectively protected; the high-frequency magnetic ring power supply unit is arranged on each voltage acquisition communication board, the power supply module supplies power to each voltage acquisition communication board through a 10kV voltage-resistant cable penetrating through the high-frequency magnetic ring power supply unit, high-voltage isolation of a power supply loop between the power supply module and each voltage acquisition communication board and between the power supply module and each voltage acquisition communication board is achieved, and the problem that power supply for the voltage acquisition circuit is difficult at present is solved.
Drawings
FIG. 1 is a circuit schematic diagram of a 10kV high-voltage frequency conversion integrated machine in the invention;
FIG. 2 is a schematic diagram of a DC bus voltage acquisition circuit of the 10kV high-voltage frequency conversion integrated machine of the invention;
fig. 3 is a schematic circuit diagram of the voltage acquisition communication board and the high-frequency magnetic ring power supply unit in the invention.
In the figure: the device comprises an input reactor 1, a rectifying unit 2, an inverting unit 3, a multi-winding motor 4, a direct current bus filter capacitor 5, a main control board 6, a voltage acquisition communication board 7, a power supply module 8, an optical fiber 9, a 10kV voltage resistant cable 10, a high-frequency magnetic ring power supply unit 11, a high-frequency magnetic ring 12, a secondary winding 13, a rectifying, filtering and voltage stabilizing circuit 14, a voltage attenuation circuit 15, an A/D conversion circuit 16, a digital coding circuit 17, an optical fiber communication transmitting circuit 18 and an optical fiber communication receiving circuit 19.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a schematic circuit diagram of a 10kV high-voltage frequency conversion all-in-one machine according to the present invention is provided, which is composed of an input reactor 1, a rectifying unit 2, an inverting unit 3, and a multi-winding motor 4, wherein an input end of the input reactor 1 is connected to a 10kV high-voltage alternating current, an output end is connected to an input end of the rectifying unit 3, an output end of the rectifying unit 3 forms a dc bus voltage, two ends of N inverting units 3 connected in series are connected to the dc bus voltage, and outputs of N inverting units 3 are connected to N windings of the multi-winding motor. Thus, the 10kV high-voltage alternating current forms a direct-current bus voltage after being rectified by the rectifying unit 2, and the direct current is converted into alternating current after being inverted by the inverting unit 3 as an input power supply of the inverting unit 3, thereby realizing the variable-frequency control of the multi-winding motor 4. In order to realize voltage-sharing control of each inversion unit 3, the voltage on the input side of each inversion unit 3 needs to be detected, a direct-current bus filter capacitor 5 is connected in parallel to the input side of each inversion unit 3, and the direct-current bus voltage acquisition circuit of the 10kV high-voltage frequency conversion all-in-one machine is used for detecting the voltages DC _1, DC _2, … and DC _ N on the input sides of N inversion units 3.
As shown in fig. 2, a schematic diagram of a 10kV high-voltage frequency conversion all-in-one dc bus voltage acquisition circuit of the invention is provided, which is composed of a main control board 6, a power module 8 and N voltage acquisition communication boards 7, the main control board 6 is the main control board of the frequency conversion all-in-one, the main control board 6 is connected with the foremost voltage acquisition communication board 7 (numbered 1) through optical fiber communication, and the other two adjacent voltage acquisition communication boards 7 are connected through optical fiber communication, so that a series communication loop is formed. All be provided with high frequency magnetic ring power supply unit 11 on every voltage acquisition communication board 1, be provided with 10kV resistant voltage cable 10 on the power module 8, 10kV resistant voltage cable 10 passes every high frequency magnetic ring power supply unit 11, like this, power module 8 can realize the power supply to every voltage acquisition communication board through exerting low pressure (200V), high frequency alternating signal for 10kV resistant voltage cable 10.
The main control board 6 and all the voltage acquisition communication boards 7 form a serial communication loop through optical fibers, each voltage acquisition communication board synchronously uploads the acquired direct current bus voltage in a time-sharing multiplexing mode, each voltage acquisition communication board comprises a data forwarding state and a bus voltage sending state, only one voltage acquisition communication board is in the bus voltage sending state at the same time, and other voltage acquisition communication boards are in the data forwarding state,
as shown in fig. 3, a schematic circuit diagram of a voltage acquisition communication board and a high-frequency magnetic ring power supply unit according to the present invention is provided, the voltage acquisition communication board 7 is composed of a voltage attenuation circuit 15, an a/D conversion circuit 16, a digital coding circuit 17, an optical fiber communication transmitting circuit 18 and an optical fiber communication receiving circuit 19, the voltage attenuation circuit 15 is configured to measure a dc bus voltage at an input terminal of the inverter unit 3, attenuate the acquired dc bus voltage and input the attenuated dc bus voltage to an input terminal of the a/D conversion circuit 16, the a/D conversion circuit 16 converts the acquired analog dc voltage signal into a digital signal and then input the digital signal to the digital coding circuit 17, and the digital coding circuit 17 codes the digital voltage signal and transmits the digital signal through the optical fiber communication transmitting circuit 18. The input end of the optical fiber communication receiving circuit 19 is connected with the output signal of the voltage acquisition communication board 7 at the rear end, and the output end is connected with the digital coding circuit 17 so as to receive and forward the voltage signals sent by other voltage acquisition communication boards 7.
Taking the voltage acquisition communication board N as an example, it is described that the DC bus voltage DC _ N is first attenuated by the voltage attenuation circuit in the process of acquiring the DC bus voltage by the voltage acquisition communication board N, the attenuated voltage signal is processed into a digital signal by the AD conversion circuit, the digital signal is processed into a serial code signal by the digital code circuit, and the serial code signal is converted into an optical signal by the optical fiber communication transmitting circuit.
The high-frequency magnetic ring power supply unit 11 is composed of a high-frequency magnetic ring 12, a secondary winding 13 and a rectification, filtering and voltage stabilizing circuit 14, a 10kV voltage-resistant cable 10 penetrates through a through hole in the high-frequency magnetic ring 12, the secondary winding 13 is wound on the high-frequency magnetic ring 12, the secondary winding 13 is connected with the input end of the rectification, filtering and voltage stabilizing circuit 14, and the output of the rectification, filtering and voltage stabilizing circuit 14 supplies power to a voltage attenuation circuit 15, an A/D conversion circuit 16, a digital coding circuit 17, an optical fiber communication transmitting circuit 18 and an optical fiber communication receiving circuit 19. The power module 8 outputs high-frequency alternating current signals (the voltage value is about 200V) to the cable 14 which can resist 10kV voltage, alternating current voltage signals can be generated in the secondary winding 13 through the electromagnetic coupling principle, and the alternating current voltage signals output by the secondary winding 13 are rectified, filtered and stabilized by the rectifying, filtering and stabilizing circuit 14 to output direct current power supplies for the operation of all modules and circuits.
According to the electromagnetic coupling principle, high-frequency voltage on a 10kV cable is coupled to a secondary winding on a magnetic ring through the magnetic ring, and high-frequency voltage output by the secondary winding is processed by a rectifying, filtering and voltage stabilizing circuit to provide a high-voltage isolation and stable working power supply for a voltage acquisition communication board. Finally, the power supply requirements of the voltage acquisition boards are met, and high-voltage isolation is achieved between the external power supply and the voltage acquisition communication boards and between the voltage acquisition communication boards.
The invention relates to a voltage acquisition method of a direct-current bus voltage acquisition circuit of a 10kV high-voltage frequency conversion all-in-one machine, which is realized by the following steps:
a) the serial communication circuit comprises communication board numbers, wherein each voltage acquisition communication board in the serial communication circuit has different address numbers, the address number of the 1 st voltage acquisition communication board connected with a main control board through an optical fiber is 1, the address number of the 2 nd voltage acquisition communication board is 2, and by analogy, the address number of the voltage acquisition communication board at the tail end of the serial communication circuit is N;
each voltage acquisition communication board synchronously uploads the acquired direct current bus voltage in a time-sharing multiplexing communication mode, each voltage acquisition communication board comprises a data forwarding state and a bus voltage sending state, only one voltage acquisition communication board is in the bus voltage sending state at the same time, and other voltage acquisition communication boards are in the data forwarding state;
b) sending a voltage of a tail-end communication board, periodically entering a bus voltage sending state by a voltage acquisition communication board with the tail end of a serial communication loop and an address number of N, and sending a serial coding signal by an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N of the voltage acquisition communication board, the acquired direct-current bus voltage and verification data;
c) after the voltage transmission of the communication board with the serial number of N-1 is detected, the voltage acquisition communication board with the address number of N-1 is switched to a bus voltage transmission state from a data forwarding state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-1 of the voltage acquisition communication board, acquired direct current bus voltage and verification data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after the transmission is finished;
d) after the voltage transmission of the communication board with the serial number of N-2 and the voltage acquisition communication board with the address number of N-2 are detected, the voltage acquisition communication board is switched from a data forwarding state to a bus voltage transmission state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-2 of the voltage acquisition communication board, the acquired direct-current bus voltage, verification data and the like, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after being transmitted;
e) voltage sending of the other communication boards is performed in the manner of the step c) and the step d), finally, the voltage acquisition communication board with the address number of 1 is switched from the data forwarding state to the bus voltage sending state after the serial coding signal with the address number of 2 is detected to be sent, the serial coding signal is sent through the optical fiber communication transmitting circuit, the serial coding signal comprises the address number of 1 of the voltage acquisition communication board, the acquired direct current bus voltage and the check data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage sending state after being sent;
f) uploading the new round of data, and sequentially uploading the respective serial coding signals once by the voltage acquisition communication boards in the serial communication loop through the steps b) to e); the periodic timing time of the voltage acquisition communication board with the address number of N is longer than the time for uploading serial coding signals by all the voltage acquisition communication boards, and a new round of data uploading is started after the timing time is up, so that the voltage of each group of buses is uploaded and acquired by all the voltage acquisition communication boards in a time-sharing and optical fiber channel multiplexing mode.
Claims (4)
1. A10 kV high-voltage frequency conversion all-in-one direct-current bus voltage acquisition circuit comprises an input reactor (1), a rectification unit (2), N inversion units (4) and a multi-winding motor (4), wherein the alternating-current input end of the rectification unit is connected to 10kV alternating current through the input reactor, the output end of the rectification unit forms direct-current bus voltage, the two ends of the N inversion units which are connected in series are connected to the direct-current bus voltage, and the input end of each inversion unit is connected with a direct-current bus filter capacitor (5); the direct current bus voltage acquisition circuit consists of a main control board (6), a power supply module (8) and N voltage acquisition communication boards (7), wherein the N voltage acquisition communication boards are used for respectively acquiring direct current voltages at the input sides of the N inversion units; the method is characterized in that: the main control board and the head end voltage acquisition communication board and two adjacent voltage acquisition communication boards are communicated through optical fibers (9) to form a series communication loop, each voltage acquisition communication board is provided with a high-frequency magnetic ring power supply unit (11) for supplying power to the voltage acquisition communication board, a power supply module (8) is provided with a 10kV voltage-resistant cable (10) penetrating through the high-frequency magnetic ring power supply unit, and the power supply module supplies power to each voltage acquisition communication board by introducing a low-voltage high-frequency signal to the 10kV voltage-resistant power supply cable; and the voltage acquisition communication board transmits the acquired direct current bus voltage to the main control board in a time-division multiplexing communication mode.
2. The 10kV high-voltage frequency conversion all-in-one direct-current bus voltage acquisition circuit according to claim 1, characterized in that: the voltage acquisition communication board (7) consists of a voltage attenuation circuit (15), an A/D conversion circuit (16), a digital coding circuit (17), an optical fiber communication receiving circuit (19) and an optical fiber communication transmitting circuit (18), wherein the input end of the voltage attenuation circuit (15) is connected to the direct current bus voltage at the input side of the inverter unit (3), and the output end of the voltage attenuation circuit is connected with the input end of the A/D conversion circuit; the output end of the A/D conversion circuit is connected with the digital coding circuit; the input end of the optical fiber communication receiving circuit is connected with the output end of the rear-end adjacent voltage acquisition communication board through an optical fiber, the output end of the optical fiber communication receiving circuit is connected with the digital coding circuit, the input end of the optical fiber communication transmitting circuit is connected with the output end of the digital coding circuit, and the output end of the optical fiber communication transmitting circuit is connected with the input end of the front-end adjacent voltage acquisition communication board or the main control board.
3. The 10kV high-voltage frequency conversion all-in-one direct-current bus voltage acquisition circuit according to claim 2, characterized in that: the high-frequency magnetic ring power supply unit (11) is composed of a high-frequency magnetic ring (12), a secondary winding (13) and a rectification, filtering and voltage stabilizing circuit (14), a 10kV voltage-resistant cable penetrates through an inner cavity of the high-frequency magnetic ring (12), the secondary winding is wound on the high-frequency magnetic ring and is connected to the input end of the rectification, filtering and voltage stabilizing circuit, the rectification, filtering and voltage stabilizing circuit rectifies, filters and stabilizes alternating current input by the secondary winding to convert the alternating current into direct current, and power is supplied to a voltage attenuation circuit (15), an A/D conversion circuit (16), a digital coding circuit (17), an optical fiber communication receiving circuit (19) and an optical fiber communication transmitting circuit (18.
4. The voltage acquisition method of the voltage acquisition circuit of the direct-current bus of the 10kV high-voltage frequency conversion all-in-one machine according to claim 1, which is realized by the following steps:
a) the serial communication circuit comprises communication board numbers, wherein each voltage acquisition communication board in the serial communication circuit has different address numbers, the address number of the 1 st voltage acquisition communication board connected with a main control board through an optical fiber is 1, the address number of the 2 nd voltage acquisition communication board is 2, and by analogy, the address number of the voltage acquisition communication board at the tail end of the serial communication circuit is N;
each voltage acquisition communication board synchronously uploads the acquired direct current bus voltage in a time-sharing multiplexing communication mode, each voltage acquisition communication board comprises a data forwarding state and a bus voltage sending state, only one voltage acquisition communication board is in the bus voltage sending state at the same time, and other voltage acquisition communication boards are in the data forwarding state;
b) sending a voltage of a tail-end communication board, periodically entering a bus voltage sending state by a voltage acquisition communication board with the tail end of a serial communication loop and an address number of N, and sending a serial coding signal by an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N of the voltage acquisition communication board, the acquired direct-current bus voltage and verification data;
c) after the voltage transmission of the communication board with the serial number of N-1 is detected, the voltage acquisition communication board with the address number of N-1 is switched to a bus voltage transmission state from a data forwarding state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-1 of the voltage acquisition communication board, acquired direct current bus voltage and verification data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after the transmission is finished;
d) after the voltage transmission of the communication board with the serial number of N-2 and the voltage acquisition communication board with the address number of N-2 are detected, the voltage acquisition communication board is switched from a data forwarding state to a bus voltage transmission state, and starts to transmit a serial coding signal through an optical fiber communication transmitting circuit, wherein the serial coding signal comprises the address number of N-2 of the voltage acquisition communication board, the acquired direct-current bus voltage, verification data and the like, and the serial coding signal automatically returns to the data forwarding state from the bus voltage transmission state after being transmitted;
e) voltage sending of the other communication boards is performed in the manner of the step c) and the step d), finally, the voltage acquisition communication board with the address number of 1 is switched from the data forwarding state to the bus voltage sending state after the serial coding signal with the address number of 2 is detected to be sent, the serial coding signal is sent through the optical fiber communication transmitting circuit, the serial coding signal comprises the address number of 1 of the voltage acquisition communication board, the acquired direct current bus voltage and the check data, and the serial coding signal automatically returns to the data forwarding state from the bus voltage sending state after being sent;
f) uploading the new round of data, and sequentially uploading the respective serial coding signals once by the voltage acquisition communication boards in the serial communication loop through the steps b) to e); the periodic timing time of the voltage acquisition communication board with the address number of N is longer than the time for uploading serial coding signals by all the voltage acquisition communication boards, and a new round of data uploading is started after the timing time is up, so that the voltage of each group of buses is uploaded and acquired by all the voltage acquisition communication boards in a time-sharing and optical fiber channel multiplexing mode.
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