CN110677097A - Bidirectional frequency converter device for high-capacity high-frequency multiphase motor - Google Patents
Bidirectional frequency converter device for high-capacity high-frequency multiphase motor Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/50—Reduction of harmonics
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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
- H02M5/443—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 thyratron or thyristor type requiring extinguishing means
- H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/4505—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
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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
- H02M5/443—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 thyratron or thyristor type requiring extinguishing means
- H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/451—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The application relates to a high-power motor and drive control thereof, in particular to a bidirectional frequency converter device for a high-capacity high-frequency multiphase motor, which comprises n mutually independent alternating current-direct current-alternating frequency units and 1 main controller; n is a positive integer greater than 1, and is equal to the number of windings of the multi-phase motor and is also equal to the number of phases of the multi-phase motor divided by 3. Each alternating current-direct current-alternating frequency unit adopts a modular structure, the structure of each alternating current-direct current-alternating frequency unit is the same, and the rectification-inversion inside each alternating current-direct current-alternating frequency unit adopts a symmetrical topological structure. The hardware structure and the software program of each AC-DC-AC frequency conversion unit are completely consistent, and the AC-DC-AC frequency conversion unit is easy to produce and assemble; each AC-DC-AC frequency conversion unit is isolated from each other, and no circulation current exists between the frequency conversion units, so that the power balance of each winding of the multi-phase motor is ensured; the alternating current-direct current-alternating current frequency units are mutually redundant and backup, so that the multi-phase motor can not be stopped.
Description
Technical Field
The present invention relates to a high power motor and a driving control thereof, and more particularly, to a bidirectional frequency converter device for a high capacity high frequency multi-phase motor.
Background
The multi-phase motor is widely used due to the advantages of large voltage and current range, small rotor loss, high motor efficiency, small direct-current voltage ripple and the like. Among them, a large-capacity high-frequency multi-phase motor has been receiving attention in recent years. The main technical characteristics of the high-capacity high-frequency multi-phase motor comprise: the fundamental frequency is high, the voltage is high, the capacity can reach megawatt level, and the rotating speed is more than 8 times of that of the conventional permanent magnet motor. The multiphase motor needs to generate electricity and to be electrically driven, and energy needs to flow in two directions. In addition, the common mode harmonic control of the motor is strict.
At present, a medium-voltage high-capacity high-frequency multi-phase motor driving frequency converter on the market mainly comprises three schemes of three-level VSC, a cascade H bridge and a thyristor-based LCC. The three-level VSC can realize bidirectional operation, but has low driving frequency and uncontrolled common-mode harmonic; the cascade H bridge can realize high frequency, but can not operate bidirectionally, and common mode harmonic is not controlled; the LCC based on the thyristor can realize bidirectional operation and control common-mode harmonic waves, but has low driving frequency. The multiphase motor driving frequency converters of the three schemes are respectively used in different application occasions, but cannot simultaneously realize high-frequency and bidirectional operation and common-mode harmonic wave controllability.
Disclosure of Invention
The present application provides a bidirectional frequency converter device for a large-capacity high-frequency multiphase motor, aiming at the defects and problems existing in the prior application, and the technical scheme is as follows:
a kind of two-way frequency converter device used for high-capacity high-frequency polyphase machine, characterized by that: the system comprises n mutually independent alternating-direct-alternating frequency units and 1 main controller; n is a positive integer greater than 1, and is equal to the number of windings of the multi-phase motor and is also equal to the number of phases of the multi-phase motor divided by 3. Each alternating current-direct current-alternating frequency unit adopts a modular structure, the structure of each alternating current-direct current-alternating frequency unit is the same, and the rectification-inversion inside each alternating current-direct current-alternating frequency unit adopts a symmetrical topological structure.
The alternating current-direct current-alternating frequency unit comprises a network side contactor, the input end of the network side contactor is connected with an external power supply, and the output end of the network side contactor is connected with the alternating current end of the rectification part; the direct current end of the rectifying part is connected with one side of the reactor; the direct current end of the inverter is connected with the other side of the reactor; and the alternating current end of the inversion part is connected with the input end of the machine side contactor, and the output end of the machine side contactor is connected with one winding of the multi-phase motor.
The net side contactor and the machine side contactor are three-phase alternating current contactors.
The power devices of the rectification part and the inversion part are thyristors; the rectification part and the inversion part are three-phase full-bridge circuits, and the circuit structures are completely the same.
Each AC-DC-AC frequency conversion unit adopts a modular structure, and the hardware and software structures of each AC-DC-AC frequency conversion unit are the same and can independently operate; each branch is provided with a breaker, and when any AC-DC-AC frequency unit is damaged, the breaker of the corresponding branch is cut off to complete the cutting off of the circuit, so that the circuit has the characteristic that the damage of any AC-DC-AC frequency unit does not influence the operation of other units.
The direct current buses of each alternating current-direct current-alternating frequency unit are not connected in parallel, the main circuits are only connected together at the input side, the output sides of the main circuits are only connected with one winding of the motor respectively, and other connection points are not provided. And the windings of the motor are isolated from each other, so that the main circuit is electrically isolated from each other between the AC-DC-AC frequency conversion units.
The AC-DC-AC frequency conversion unit can realize bidirectional energy flow, namely energy can flow from the side of a power grid to the side of a motor (running in an electric mode) and also can flow from the side of the motor to the side of the power grid (running in a power generation mode). The machine side and the network side of the AC-DC-AC frequency conversion unit have the same topological structures and adopt a three-phase bridge topology based on a thyristor.A three-phase bridge can be in rectification operation or inversion operation by adjusting the trigger angle of the three-phase bridge of the thyristor between 0 ~ 360 degrees.A three-phase bridge is in rectification operation when the trigger angle is between 0 ~ 180 degrees.A three-phase bridge is in inversion operation when the trigger angle is between 180 ~ 360 degrees.A three-phase bridge is in inversion operation when the multi-phase motor is in the electric mode, the three-phase bridge on the side is in rectification operation, the three-phase bridge on the machine side is in inversion operation, and energy flows from the side of the power grid to the side.
The input end of the main controller is connected with the analog signals and the digital signals of the n alternating-direct-alternating frequency units, and the signals of the real-time voltage, current, temperature and the like of the alternating-direct-alternating frequency units are collected; the output end of the main controller is connected with the digital signals and the driving signals of the n alternating-direct-alternating frequency units and is used for controlling power devices, contactors, bypass switches, relays and the like of the alternating-direct-alternating frequency units. The main controller controls the driving pulse sequence of the n alternating-direct-alternating frequency units, and the pulses among the n alternating-direct-alternating frequency units share one clock reference, so that the synchronization relationship is maintained, and the harmonic currents of different phase windings are ensured to have a fixed phase relationship. The phase difference of pulse fundamental waves among the n alternating-direct-alternating frequency units is the same as the phase shift of the windings of the multi-phase motor, so that high-frequency harmonic currents can be mutually weakened, and the total electromagnetic torque ripple is reduced. The main controller can close 1 or n AC-DC-AC frequency conversion units, and the power reduction operation can be realized.
Compared with the prior art, the beneficial effect of this application is:
1. in the application, a bidirectional frequency converter device for a high-capacity high-frequency multiphase motor is provided, which comprises n mutually independent AC-DC-AC frequency conversion units, wherein each AC-DC-AC frequency conversion unit is connected with one winding of the multiphase motor, so that the multiphase motor is driven by the multiphase frequency converter.
2. The AC-DC-AC frequency conversion unit adopts a modular design concept, and the hardware structure and the software program of each AC-DC-AC frequency conversion unit are completely consistent, so that the production and the assembly are easy; each AC-DC-AC frequency conversion unit is isolated from each other, and no circulation current exists between the frequency conversion units, so that the power balance of each winding of the multi-phase motor is ensured; the n alternating-direct-alternating frequency units are mutually redundantly backed up, when 1 or more alternating-direct-alternating frequency units have faults, other alternating-direct-alternating frequency units can still work normally, and the multi-phase motor cannot be stopped.
3. The rectification-inversion in each AC-DC-AC frequency conversion unit adopts a symmetrical topology, so that the bidirectional flow of energy can be naturally realized, the control method is unified, and the power generation and electric operation working conditions can be smoothly transited; the thyristor is used as a power module, common mode harmonic of the multi-phase motor is controllable, and the multi-phase motor is not easy to damage. The phase of the driving pulse of the n alternating-direct-alternating frequency units is controlled, so that high-frequency harmonic currents among motor windings are weakened mutually, and the total electromagnetic torque pulsation of the motor is reduced. The main controller can realize the cooperative control of a plurality of AC-DC-AC frequency conversion units.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a bidirectional frequency converter device of a high-capacity high-frequency multi-phase motor provided by the invention;
fig. 2 is a schematic structural diagram of an ac-dc-ac frequency conversion unit provided by the present invention.
Fig. 3 is a schematic structural diagram of a 12-phase motor bidirectional frequency converter according to an embodiment of the present invention.
Fig. 4-5 are simulation result graphs of motor torque and electromagnetic power of the two-way inverter of the phase motor in the power generation mode according to the embodiment of the invention.
Fig. 6-7 are simulation result graphs of motor torque and electromagnetic power of the bidirectional inverter of the phase motor 12 in the electric mode according to the embodiment of the present invention.
In the drawings:
the system comprises a 1-AC-DC-AC frequency conversion unit, a 2-main controller, a 3-network side contactor, a 4-external power supply, a 5-rectifying part, a 6-electric reactor, a 7-inverting part, an 8-winding and a 9-machine side contactor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
A kind of two-way frequency converter device used for high-capacity high-frequency polyphase electrical machinery, it includes n mutual independent AC-DC-AC frequency conversion units 1 and 1 master controllers 2; n is a positive integer greater than 1, n is equal to the number of windings 8 of the multiphase motor, and is also equal to the number of phases of the multiphase motor divided by 3. Each alternating current-direct current-alternating frequency unit 1 adopts a modular structure, each alternating current-direct current-alternating frequency unit 1 has the same structure, and the rectification-inversion inside each alternating current-direct current-alternating frequency unit 1 adopts a symmetrical topological structure.
The main controller 2 in the application can be realized by a special industrial control board which is well known by technical personnel in the field, but not limited to, the industrial control board is based on a DSP + FPGA architecture, a DSP model can adopt a TMS320F28377 dual-core processor for realizing a control algorithm, and the FPGA can adopt a Cyclone IV series product for realizing pulse formation, IO expansion and inter-board communication and synchronization.
The alternating current-direct current-alternating frequency unit 1 comprises a network side contactor 3, the input end of the network side contactor 3 is connected with an external power supply 4, and the output end of the network side contactor 3 is connected with the alternating current end of the rectifying part 5; the direct current end of the rectifying part 5 is connected with one side of the reactor 6; the direct current end of the inverter is connected with the other side of the reactor 6; the alternating current end of the inversion part 7 is connected with the input end of the machine side contactor 9, and the output end of the machine side contactor 9 is connected with one winding 8 of the multi-phase motor.
The grid side contactor 3 and the machine side contactor 9 are three-phase ac contactors.
The power devices of the rectifying part 5 and the inverting part 7 are thyristors; the rectification part 5 and the inversion part 7 are all three-phase full-bridge circuits, and the circuit structures are completely the same.
Each AC-DC-AC frequency conversion unit 1 adopts a modular structure, and the software and hardware structures of each AC-DC-AC frequency conversion unit 1 are the same and can independently operate; each branch is provided with a breaker, and when any one AC-DC-AC frequency unit 1 is damaged, the breaker of the corresponding branch is cut off to complete the cutting off from the circuit, so that the circuit has the characteristic that the damage of any one AC-DC-AC frequency unit 1 does not influence the operation of other units.
The dc buses of each ac-dc-ac frequency unit 1 are not connected in parallel, the main circuits are connected together only at the input side, and their output sides are connected with only one winding 8 of the motor, respectively, without other connection points. And the windings 8 of the motor are isolated from each other, thus corresponding to the electrical isolation of the main circuit between each ac-dc-ac frequency unit 1.
The AC-DC-AC frequency conversion unit 1 can realize bidirectional energy flow, namely energy can flow from the side of a power grid to the side of a motor (running in an electric mode) and also can flow from the side of the motor to the side of the power grid (running in a power generation mode). The machine side and the network side of the AC-DC-AC frequency conversion unit 1 have the same topological structure and adopt a three-phase bridge topology based on a thyristor.A three-phase bridge can be in rectification running or inversion running by adjusting the trigger angle of the three-phase bridge of the thyristor between 0 ~ 360 degrees.A three-phase bridge is in rectification running when the trigger angle is between 0 ~ 180 degrees.A three-phase bridge is in inversion running when the trigger angle is between 180 ~ 360 degrees.
The input end of the main controller 2 is connected with the analog signals and the digital signals of the n alternating-direct-alternating frequency units 1, and the signals of the real-time voltage, current, temperature and the like of the alternating-direct-alternating frequency units 1 are collected; the output end of the main controller 2 is connected with the digital signals and the driving signals of the n alternating-direct-alternating frequency units 1 and is used for controlling power devices, contactors, bypass switches, relays and the like of the alternating-direct-alternating frequency units 1. The main controller 2 controls the driving pulse sequence of the n ac-dc-ac frequency units 1, and the pulses among the n ac-dc-ac frequency units 1 share one clock reference, so as to maintain the synchronous relationship and ensure that the harmonic currents of the windings 8 in different phases have a fixed phase relationship. The phase difference of pulse fundamental waves among the n alternating-direct-alternating frequency units 1 is the same as the phase shift of the multi-phase motor winding 8, so that the high-frequency harmonic currents can be mutually weakened, and the total electromagnetic torque ripple is reduced. The main controller 2 can turn off 1 or n ac-dc-ac frequency conversion units 1, and the power-down operation can be realized.
In the present application, a bidirectional frequency converter device for a high-capacity high-frequency multiphase motor is provided, comprising n mutually independent ac-dc-ac frequency conversion units 1, each ac-dc-ac frequency conversion unit 1 is connected with one winding 8 of the multiphase motor, so as to realize the driving of the multiphase motor by the multiphase frequency converter.
The AC-DC-AC frequency conversion unit 1 adopts a modular design concept, and the hardware structure and the software program of each AC-DC-AC frequency conversion unit 1 are completely consistent, so that the production and the assembly are easy; each AC-DC-AC frequency conversion unit 1 is isolated from each other, and no circulation current exists between frequency conversion units, so that the power balance of each winding 8 of the multi-phase motor is ensured; the n alternating-direct-alternating frequency units 1 are mutually redundant and backup, when 1 or more alternating-direct-alternating frequency units 1 have faults, other alternating-direct-alternating frequency units 1 can still work normally, and the multi-phase motor can not be stopped.
The rectification-inversion in each AC-DC-AC frequency conversion unit 1 adopts a symmetrical topology, so that the bidirectional flow of energy can be naturally realized, the control method is uniform, and the working conditions of power generation and electric operation can be smoothly transited; the thyristor is used as a power module, common mode harmonic of the multi-phase motor is controllable, and the multi-phase motor is not easy to damage. By controlling the phase of the driving pulse of the n alternating-direct-alternating frequency units 1, the high-frequency harmonic current among the motor windings 8 is weakened mutually, and the total electromagnetic torque pulsation of the motor is reduced. The main controller 2 can realize the cooperative control of a plurality of ac-dc-ac frequency conversion units 1.
Example 2
Fig. 3 shows an embodiment of the present invention, and the bidirectional frequency converter device for 12-phase motor is implemented as follows:
the motor comprises 4 AC-DC-AC frequency conversion units 1 and a main controller 2, wherein the input side of each AC-DC-AC frequency conversion unit 1 is connected with an external power supply 4, and the output side of each AC-DC-AC frequency conversion unit 1 is connected with one winding 8 of a 12-phase motor.
The hardware structures of the 4 AC-DC-AC frequency conversion units 1 are completely the same, and the 4 AC-DC-AC frequency conversion units comprise a network side contactor 3, a rectification part 5, a reactor 6, an inversion part 7, a machine side contactor 9 and a main controller 2. The circuit structure of the rectifying part 5 and the circuit structure of the inverting part 7 are completely the same, the three-phase full-bridge circuit is adopted, and the power device is a thyristor. The input end of the network side contactor 3 is connected with an external power supply 4, and the output end is connected with the alternating current end of the rectifying part 5; the direct current end of the rectifying part 5 is connected with one side of the reactor 6; the direct current end of the inverter is connected with the other side of the reactor 6; the ac terminal of the inverter section 7 is connected to the input terminal of the machine side contactor 9, and the output terminal of the machine side contactor 9 is connected to one winding 8 of the multiphase motor.
The input end of the main controller 2 is connected with analog signals and digital signals of the 4 AC-DC-AC frequency conversion units 1, real-time signals of voltage, current, temperature and the like at the power supply side are collected, a control algorithm is executed, digital signals are output to drive power devices of the AC-DC-AC frequency conversion units 1, and DC bus voltage is established and bus current is stabilized; in a power generation mode, signals such as real-time voltage, current and torque at the side of a motor winding 8 are collected, a control algorithm is executed, a digital signal is output to drive a power device of an AC-DC-AC frequency conversion unit 1, and the torque current of the motor is controlled in real time; in the electric mode, signals such as real-time voltage, current, rotating speed and the like at the side of the motor winding 8 are collected, a control algorithm is executed, a digital signal is output to drive a power device of the AC-DC-AC frequency conversion unit 1, and the rotating speed of the motor is controlled in real time.
The sequence of drive pulses for the 4 ac-dc-ac frequency conversion units 1 is determined by the main controller 2 and has the following characteristics: the pulses between the 4 ac-dc-ac frequency units 1 share a clock reference, thereby maintaining a synchronous relationship and ensuring that harmonic currents of different phase windings 8 have a fixed phase relationship. The phase difference of the pulse fundamental wave between the 4 AC-DC-AC frequency conversion units 1 is the same as the phase shift of the multi-phase motor winding 8, so that the high-frequency harmonic current can be mutually weakened, and the total electromagnetic torque ripple is reduced.
4 AC-DC-AC frequency conversion units 1 are completely electrically isolated, and 4 sets of windings 8 of 12-phase motors are isolated from each other, so that no essential electric circulation exists among 4 parallel frequency converters. The power between the windings 8 can be balanced.
4 AC-DC-AC frequency conversion units 1 can operate independently, and any one AC-DC-AC frequency conversion unit 1 is damaged without influencing the operation of other units. Furthermore, a reduced power operation can be achieved by the main controller 2 switching off 1 or more ac-dc-ac frequency conversion units 1.
The ac-dc-ac frequency conversion unit 1 can realize bidirectional energy flow, and energy can flow from the grid side to the motor side (motoring mode) and from the motor side to the grid side (generating mode). In the power generation mode, the torque and the electromagnetic power of the generator are shown in fig. 4 and 5, and the negative sign represents the power generation working condition. The power of the generator reaches the rated 10 MW. The torque fluctuation and the power fluctuation are small, only high-frequency pulsation with the frequency of 6kHz exists, the amplitude is about +/-4%, and the performance is good. In the electric mode, motor torque and electromagnetic power are as shown in fig. 6 and 7, and the plus sign indicates an electric operating condition. The motor power reaches a rated 5 MW. The torque fluctuation and the power fluctuation are small, only high-frequency pulsation with the frequency of 3kHz exists, the amplitude is about +/-4%, and the performance is good.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. The above embodiments only represent the preferred embodiments of the present invention, and various modifications of some parts of the embodiments by those skilled in the art will embody the principles of the present invention and fall within the protection scope of the present invention.
Claims (10)
1. A kind of two-way frequency converter device used for high-capacity high-frequency polyphase machine, characterized by that: comprises n mutually independent AC-DC-AC frequency conversion units (1) and 1 main controller (2); each alternating current-direct current-alternating frequency unit (1) adopts a modular structure, each alternating current-direct current-alternating frequency unit (1) has the same structure, and the rectification-inversion inside each alternating current-direct current-alternating frequency unit (1) adopts a symmetrical topological structure.
2. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 1, wherein: the alternating current-direct current-alternating frequency unit (1) comprises a network side contactor (3), the input end of the network side contactor (3) is connected with an external power supply (4), and the output end of the network side contactor (3) is connected with the alternating current end of the rectifying part (5); the direct current end of the rectifying part (5) is connected with one side of the reactor (6); the direct current end of the inverter is connected with the other side of the reactor (6); the alternating current end of the inversion part (7) is connected with the input end of the machine side contactor (9), and the output end of the machine side contactor (9) is connected with one winding (8) of the multi-phase motor.
3. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 2, characterized in that: the net side contactor (3) and the machine side contactor (9) are three-phase alternating current contactors; the main controller (2) comprises but is not limited to an industrial control board, the industrial control board is based on a DSP + FPGA architecture, a TMS320F28377 dual-core processor is adopted in the DSP model, and a CycloneIV series product is adopted in the FPGA.
4. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 2, characterized in that: the power devices of the rectifying part (5) and the inverting part (7) are thyristors; the rectification part (5) and the inversion part (7) are all three-phase full-bridge circuits, and the circuit structures are completely the same.
5. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 1, wherein: each AC-DC-AC frequency conversion unit (1) has the same hardware and software structure and can independently operate; each branch is provided with a breaker, and when any one AC-DC-AC frequency conversion unit (1) is damaged, the breaker of the corresponding branch is cut off to be cut off from the circuit.
6. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 5, wherein: the direct current buses of each alternating current-direct current-alternating frequency unit (1) are not connected in parallel, the main circuits are only connected together at the input side, the output sides of the main circuits are only connected with one winding (8) of the motor respectively, the windings (8) of the motor are isolated from each other, and the main circuits between the alternating current-direct current-alternating frequency units (1) are electrically isolated.
7. The bidirectional converter device for large-capacity high-frequency multiphase motors as claimed in claim 1, wherein the machine side and network side topologies of the AC-DC-AC frequency conversion unit (1) are identical, a thyristor-based three-phase bridge topology is adopted, the three-phase bridge can be in rectifying operation or in inverting operation by adjusting the firing angle of the thyristor three-phase bridge between 0 ~ 360 degrees, the three-phase bridge is in rectifying operation when the firing angle is between 0 ~ 180 degrees, and the three-phase bridge is in inverting operation when the firing angle is between 180 ~ 360 degrees.
8. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 7, wherein: when the multi-phase motor operates in an electric mode, the three-phase bridge on the grid side operates in a rectification mode, the three-phase bridge on the machine side operates in an inversion mode, and energy flows from the grid side to the motor side; when the multiphase motor operates in a power generation mode, the machine side three-phase bridge operates in a rectification mode, the grid side three-phase bridge operates in an inversion mode, and energy flows from the motor side to the power grid side.
9. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 1, wherein: the input end of the main controller (2) is connected with the analog signals and the digital signals of the n alternating-direct-alternating frequency units (1) to acquire signals of real-time voltage, current, temperature and the like of the alternating-direct-alternating frequency units (1); the output end of the main controller (2) is connected with the digital signals and the driving signals of the n alternating-direct-alternating frequency units (1) and is used for controlling power devices, contactors, bypass switches and relays of the alternating-direct-alternating frequency units (1).
10. A bidirectional frequency converter apparatus for a large-capacity high-frequency multi-phase motor according to claim 9, wherein: the main controller (2) controls the driving pulse sequence of n AC-DC-AC frequency-changing units (1), the pulses among the n AC-DC-AC frequency-changing units (1) share one clock reference, the pulse fundamental wave phase difference among the n AC-DC-AC frequency-changing units (1) is the same as the phase shift of a multiphase motor winding (8), and the main controller (2) can close 1 or n AC-DC-AC frequency-changing units (1).
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