CN113422519B - Frequency converter topology based on harmonic compensation, control method and frequency converter - Google Patents
Frequency converter topology based on harmonic compensation, control method and frequency converter Download PDFInfo
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- CN113422519B CN113422519B CN202110645244.5A CN202110645244A CN113422519B CN 113422519 B CN113422519 B CN 113422519B CN 202110645244 A CN202110645244 A CN 202110645244A CN 113422519 B CN113422519 B CN 113422519B
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
Abstract
The invention discloses a frequency converter topology based on harmonic compensation, a control method and a frequency converter. A frequency converter topology based on harmonic compensation is formed by arranging a rectifying circuit, a compensating circuit and an inverter circuit; the rectification circuit is used for converting an initial alternating current power supply provided by the three-phase power supply into a direct current power supply and transmitting the direct current power supply to the compensation circuit; the compensation circuit is used for generating a compensation power supply according to the direct current power supply, superposing the direct current power supply and the compensation power supply in series to generate a standard direct current power supply, and transmitting the standard direct current power supply to the inverter circuit; the inverter circuit is used for converting a standard direct current power supply into alternating current so as to drive the motor. The power supply rectified by the rectifying circuit is converted through the compensating circuit to generate a compensating power supply, and the compensating power supply and the rectified direct current power supply are overlapped in series, so that the amplitude of the output direct current voltage can be accurately and effectively regulated, the power is further increased, the harmonic content of the alternating current output is reduced, and meanwhile, the capacitance capacity of the traditional topology and the soft start circuit can be reduced.
Description
Technical Field
The invention relates to the technical field of frequency converters, in particular to a frequency converter topology based on harmonic compensation, a control method and a frequency converter.
Background
A Variable-frequency Drive (VFD) is a power control device that applies a frequency conversion technique and a microelectronics technique to control an ac motor by changing a frequency of a motor operating power supply. The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detecting unit micro-processing unit and the like. The frequency converter is used for adjusting the voltage and frequency of the output power supply by switching on and off the internal IGBT, and providing the required power supply voltage according to the actual requirement of the motor, so as to achieve the purposes of energy saving and speed regulation. Along with the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
At present, when the frequency converter is generally composed of rectification, a capacitor, inversion and the like, and when the three-phase power supply charges the capacitor through rectification, the capacitor has large capacity and high withstand voltage, the impact current of the rectifier is also large, and if the controllable rectification with the three-phase PFC is selected, the cost is high. Therefore, how to accurately and effectively adjust the rectified voltage amplitude is a technical problem to be solved.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a rectifier, and aims to solve the technical problem that the rectified voltage amplitude cannot be accurately and effectively adjusted at low cost in the prior art.
To achieve the above object, the present invention provides a frequency converter topology based on harmonic compensation, the frequency converter topology based on harmonic compensation includes: a rectifying circuit, a compensating circuit and an inverting circuit;
the input end of the rectifying circuit is connected with a three-phase power supply, the positive output end of the rectifying circuit is respectively connected with the positive input end of the compensating circuit and the negative output end of the compensating circuit, the negative output end of the rectifying circuit is respectively connected with the negative input end of the compensating circuit and the negative input end of the inverting circuit, the positive output end of the compensating circuit is connected with the positive input end of the inverting circuit, and the output end of the inverting circuit is connected with the motor;
the rectification circuit is used for converting an initial alternating current power supply provided by the three-phase power supply into a direct current power supply and transmitting the direct current power supply to the compensation circuit;
the compensation circuit is used for generating a compensation power supply according to the direct current power supply, superposing the direct current power supply and the compensation power supply in series to generate a standard direct current power supply, and transmitting the standard direct current power supply to the inverter circuit;
the inverter circuit is used for converting the standard direct-current power supply into an alternating-current power supply so as to drive the motor.
Optionally, the compensation circuit includes: an inductor, a first capacitor, a first diode, and a first insulated gate bipolar transistor;
the first end of the inductor is respectively connected with the negative electrode of the first capacitor and the positive output end of the rectifying circuit, the second end of the inductor is respectively connected with the anode of the first diode and the collector of the first insulated gate bipolar transistor, the emitter of the first insulated gate bipolar transistor is connected with the negative output end of the rectifying circuit and the negative input end of the inverting circuit, and the positive electrode of the first capacitor is respectively connected with the cathode of the first diode and the positive input end of the inverting circuit.
Optionally, the compensation circuit includes: the system comprises a single-phase full-bridge inversion unit, an intermediate frequency transformer and a single-phase full-bridge rectification unit;
the positive input end of the single-phase full-bridge inversion unit is connected with the positive output end of the rectification circuit, the negative input end of the single-phase full-bridge inversion unit is connected with the negative output end of the rectification circuit and the negative input end of the inversion circuit, the first output end of the single-phase full-bridge inversion unit is connected with the first input end of the intermediate frequency transformer, the second output end of the single-phase full-bridge inversion unit is connected with the second input end of the intermediate frequency transformer, the first output end of the intermediate frequency transformer is connected with the first input end of the single-phase full-bridge rectification unit, the second output end of the intermediate frequency transformer is connected with the second input end of the single-phase full-bridge rectification unit, the positive output end of the single-phase full-bridge rectification unit is connected with the positive input end of the inversion circuit, and the negative output end of the single-phase full-bridge rectification unit is connected with the positive output end of the rectification circuit;
the single-phase full-bridge inversion unit is used for switching on or switching off according to a control signal so as to control the magnitude, the direction and the frequency of the primary side alternating voltage of the intermediate frequency transformer;
the intermediate frequency transformer is used for attenuating the primary side alternating voltage of the intermediate frequency transformer according to the primary side-secondary side turn ratio and transmitting the secondary side of the intermediate frequency transformer to the single-phase full-bridge rectifying unit;
the single-phase full-bridge rectifying unit is used for rectifying the secondary side voltage of the intermediate frequency transformer into direct current voltage.
In order to achieve the above object, the present invention further provides a method for controlling a topology of a frequency converter based on harmonic compensation, the method being based on the frequency converter topology based on harmonic compensation as described above, the method comprising:
the rectification circuit converts an initial alternating current power supply provided by a three-phase power supply into a direct current power supply and transmits the direct current power supply to the compensation circuit;
the compensation circuit generates a compensation power supply according to the direct current power supply, superimposes the direct current power supply and the compensation power supply to generate a standard direct current power supply, and transmits the standard direct current power supply to the inverter circuit;
the inverter circuit converts the standard direct current power supply into alternating current to drive the motor.
To achieve the above object, the present invention also proposes a frequency converter comprising a frequency converter topology based on harmonic compensation as described above.
According to the invention, a converter topology based on harmonic compensation is formed by arranging a rectifying circuit, a compensating circuit and an inverter circuit; the input end of the rectifying circuit is connected with a three-phase power supply, the positive output end of the rectifying circuit is respectively connected with the positive input end of the compensating circuit and the negative output end of the compensating circuit, the negative output end of the rectifying circuit is respectively connected with the negative input end of the compensating circuit and the negative input end of the inverter circuit, the positive output end of the compensating circuit is connected with the positive input end of the inverter circuit, and the output end of the inverter circuit is connected with the motor; the rectification circuit is used for converting an initial alternating current power supply provided by the three-phase power supply into a direct current power supply and transmitting the direct current power supply to the compensation circuit; the compensation circuit is used for generating a compensation power supply from the direct current power supply, superposing the direct current power supply and the compensation power supply in series to generate a standard direct current power supply, and transmitting the standard direct current power supply to the inverter circuit; and the inverter circuit is used for converting the standard direct-current power supply into alternating current so as to drive the motor. According to the invention, the power rectified by the rectifying circuit is converted by the compensating circuit to generate the compensating power, and the compensating power is overlapped with the rectified direct current power, so that the amplitude of the output direct current voltage can be accurately and effectively regulated, and the power can be further increased and the content of alternating current output harmonic waves can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of a first embodiment of a harmonic compensation-based frequency converter topology according to the present invention;
fig. 2 is a schematic circuit diagram of a rectifying circuit according to the present invention;
FIG. 3 is a schematic diagram of a compensation circuit according to the present invention;
FIG. 4 is a schematic diagram of a circuit structure of another compensation circuit according to the present invention;
fig. 5 is a schematic circuit diagram of an inverter circuit according to the present invention;
fig. 6 is a waveform diagram (solid line) of the output dc voltage of the rectifying circuit according to the present invention;
fig. 7 is a schematic flow chart of a first embodiment of a topology control method of a frequency converter based on harmonic compensation according to the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
|
| 10 | Rectifying | L | Inductance | |
| 20 | Compensation circuit | C1～C2 | First to |
|
| 30 | Inverter circuit | D1～D17 | First to seventeenth diodes | |
| 201 | Single-phase full-bridge inversion unit | Q1～Q11 | First to eleventh insulated gate bipolar transistors | |
| 202 | Single-phase full-bridge rectifying unit | T | Intermediate frequency transformer |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1, fig. 1 is a functional block diagram of a first embodiment of a frequency converter topology based on harmonic compensation according to the present invention.
As shown in fig. 1, in the present embodiment, the frequency converter topology based on harmonic compensation includes: a rectifier circuit 10, a compensation circuit 20, and an inverter circuit 30;
the input end of the rectifying circuit 10 is connected with a three-phase power supply, the positive output end of the rectifying circuit 10 is respectively connected with the positive input end of the compensating circuit 20 and the negative output end of the compensating circuit 20, the negative output end of the rectifying circuit 10 is respectively connected with the negative input end of the compensating circuit 20 and the negative input end of the inverting circuit 30, the positive output end of the compensating circuit 20 is connected with the positive input end of the inverting circuit 30, and the output end of the inverting circuit 30 is connected with the motor;
the frequency converter used in industry is divided into a single phase and three phases, the single phase and the three phases are distinguished by the voltage supplied by the main loop, the three phases are that the main loop is connected with 380V alternating current of RST three phases, and the output is connected with three phase line UVW for the motor; the single-phase circuit is connected with 220-volt LN alternating current of the single-phase circuit, and outputs the single-phase circuit to the motor by connecting UVW three-phase lines, and the embodiment is preferably a three-phase frequency converter.
It is understood that a three-phase power supply is a power supply consisting of three alternating potentials of the same frequency, equal amplitude and mutually differing in phase by 120 ° in sequence. An electric motor is a device that converts electrical energy into mechanical energy.
A rectifying circuit 10 for converting an initial alternating current supplied from a three-phase power supply into a direct current power supply, the direct current power supply voltage containing 300Hz harmonics, and transmitting the direct current power supply to the compensating circuit 20;
the rectifier circuit 10 converts an ac power source into a dc power source.
Further, referring to fig. 2, fig. 2 is a schematic circuit diagram of a rectifying circuit according to the present invention.
As shown in fig. 2, the rectifying circuit 10 includes: a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, and an eleventh diode D11;
the anode of the sixth diode D6 and the cathode of the seventh diode D7 are connected to R of the three-phase power supply, the anode of the eighth diode D8 and the cathode of the ninth diode D9 are connected to S of the three-phase power supply, the anode of the twelfth diode D10 and the cathode of the eleventh diode D11 are connected to T of the three-phase power supply, the cathode of the sixth diode D6, the cathode of the eighth diode D8 and the cathode of the twelfth diode D10 are connected to the positive input terminal of the compensation circuit 20, and the anode of the seventh diode D7, the anode of the ninth diode D9 and the anode of the eleventh diode D11 are connected to the negative input terminal of the compensation circuit 20.
It should be understood that, in the present embodiment, the rectifying circuit 10 is powered by a three-phase power supply, the rectifying circuit 10 is composed of six diodes, the sixth diode D6, the eighth diode D8 and the twelfth diode D10 are a common cathode group, and the seventh diode D7, the ninth diode D9 and the eleventh diode D11 are a common anode group.
The compensation circuit 20 is configured to generate a compensation power supply according to the dc power supply, and superimpose the dc power supply and the compensation power supply in series to generate a standard dc power supply, and transmit the standard dc power supply to the inverter circuit 30;
it is understood that when the dc power is input to the compensation circuit 20, the compensation circuit 20 may generate a compensation power according to the dc power, and the dc power output by the rectifying circuit 10 and the compensation power output by the compensation circuit 20 may be superimposed in series to generate a standard dc power.
Further, referring to fig. 3, fig. 3 is a schematic circuit structure of a compensation circuit according to the present invention.
As shown in fig. 3, the compensation circuit 20 includes: an inductor L, a first capacitor C1, a first diode D1, and a first insulated gate bipolar transistor Q1;
the first end of the inductor L is connected with the negative electrode of the first capacitor C1 and the positive output end of the rectifying circuit 10, the second end of the inductor L is connected with the anode of the first diode D1 and the collector of the first insulated gate bipolar transistor Q1, the emitter of the first insulated gate bipolar transistor Q1 is connected with the negative output end of the rectifying circuit 10, and the positive electrode of the first capacitor C1 is connected with the cathode of the first diode D1 and the positive input end of the inverter circuit 30.
In a specific implementation, the on-off time of the first insulated gate bipolar transistor Q1 may be controlled by software, the longer the on time of the first insulated gate bipolar transistor Q1, the more energy is stored in the inductor L, when the first insulated gate bipolar transistor Q1 is turned off, the inductor L may charge the first capacitor C1 through the first diode D1, after the charging is completed, the first capacitor C1 is used as a compensation power supply, and is overlapped with the rectified dc power supply in series, and together discharges to the load in the inverter circuit 30. Accordingly, the compensation voltage of the output of the compensation circuit 20 can be controlled according to the on-time of the first igbt Q1, and the longer the on-time of the first igbt Q1, the larger the compensation voltage.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of another compensation circuit according to the present invention.
As shown in fig. 4, the compensation circuit 20 includes: a single-phase full-bridge inverter unit 201, an intermediate frequency transformer T, and a single-phase full-bridge rectifier unit 202;
the positive input end of the single-phase full-bridge inverter unit 201 is connected with the positive output end of the rectifying circuit 10, the negative input end of the single-phase full-bridge inverter unit 201 is connected with the negative output end of the rectifying circuit 10, the first output end of the single-phase full-bridge inverter unit 201 is connected with the first input end of the intermediate frequency transformer T, the second output end of the single-phase full-bridge inverter unit 201 is connected with the second input end of the single-phase full-bridge rectifying unit 202, the second output end of the intermediate frequency transformer T is connected with the second input end of the single-phase full-bridge rectifying unit 202, the positive output end of the single-phase full-bridge rectifying unit 202 is connected with the positive input end of the rectifying circuit 30, and the negative output end of the single-phase full-bridge rectifying unit 202 is connected with the positive output end of the rectifying circuit 10;
the single-phase full-bridge inverter unit 201 is configured to turn on or off according to a control signal, thereby controlling the magnitude, direction, and frequency of the primary ac voltage of the intermediate frequency transformer T;
the single-phase full-bridge inverter unit 201 includes: a second insulated gate bipolar transistor Q2, a third insulated gate bipolar transistor Q3, a fourth insulated gate bipolar transistor Q4, and a fifth insulated gate bipolar transistor Q5;
the collector of the second insulated gate bipolar transistor Q2 and the collector of the fourth insulated gate bipolar transistor Q4 are connected to the positive output terminal of the rectifying circuit 10, the emitter of the third insulated gate bipolar transistor Q3 and the emitter of the fifth insulated gate bipolar transistor Q5 are connected to the negative output terminal of the rectifying circuit 10, the emitter of the fourth insulated gate bipolar transistor Q4 is connected to the collector of the fifth insulated gate bipolar transistor Q5 and the first input terminal of the intermediate frequency transformer T, respectively, and the emitter of the second insulated gate bipolar transistor Q2 is connected to the collector of the third insulated gate bipolar transistor Q3 and the second input terminal of the intermediate frequency transformer T, respectively.
The on-time of the second insulated gate bipolar transistor Q2, the third insulated gate bipolar transistor Q3, the fourth insulated gate bipolar transistor Q4, and the fifth insulated gate bipolar transistor Q5 may be controlled by a control signal.
The intermediate frequency transformer T is used for attenuating the primary side alternating voltage of the intermediate frequency transformer according to the primary side-to-secondary side turn ratio and transmitting the secondary side of the intermediate frequency transformer to the single-phase full-bridge rectifying unit 202;
one end of a primary coil of the intermediate frequency transformer T is connected with a first output end of the single-phase full-bridge inversion unit 201, the other end of the primary coil of the intermediate frequency transformer T is connected with a second output end of the single-phase full-bridge inversion unit 201, one end of a secondary coil of the intermediate frequency transformer T is connected with a first input end of the single-phase full-bridge rectification unit 202, and the other end of the secondary coil of the intermediate frequency transformer T is connected with a second input end of the single-phase full-bridge rectification unit 202.
The single-phase full-bridge rectifying unit 202 is used for rectifying the secondary side voltage of the intermediate frequency transformer into a direct current voltage.
Since the secondary voltage output from the intermediate frequency transformer T is an ac voltage, the single-phase full-bridge rectifier 202 is required to convert the ac signal into a dc voltage and output the dc voltage to the inverter circuit 30.
Specifically, the single-phase full-bridge rectification unit 202 includes: a second diode D2, a third diode D3, a fourth diode D4, and a fifth diode D5;
the first output end of the intermediate frequency transformer T is respectively connected with the cathode of the fourth diode D4 and the anode of the fifth diode D5, the second output end of the intermediate frequency transformer T is respectively connected with the anode of the second diode D2 and the cathode of the third diode D3, the positive input end of the inverter circuit 30 is respectively connected with the cathode of the second diode D2 and the cathode of the fifth diode D5, and the negative input end of the inverter circuit 30 is respectively connected with the anode of the third diode D3 and the anode of the fourth diode D4.
It will be appreciated that the compensation circuit 20 further comprises: a second capacitor C2; the positive electrode of the second capacitor C2 is respectively connected with the positive output end of the single-phase full-bridge rectifying unit 202 and the positive input end of the inverter circuit 30, and the negative electrode of the second capacitor C2 is respectively connected with the negative output end of the single-phase full-bridge rectifying unit 202 and the positive output end of the rectifying circuit 10;
in a specific implementation, the longer the effective on time of the single-phase full-bridge inverter unit 201, the more the primary winding of the intermediate frequency transformer T stores energy, the larger the voltage of the secondary winding of the intermediate frequency transformer T will be, and then the single-phase full-bridge rectifier unit 202 converts the ac voltage output by the intermediate frequency transformer into the dc voltage, and charges the second capacitor C2. Therefore, the compensation voltage of the output of the compensation circuit 20 can be controlled according to the effective on-time of the single-phase full-bridge inverter unit 201, and the longer the effective on-time of the single-phase full-bridge inverter unit 201, the larger the compensation voltage.
The direct current power supply generated by the rectifying circuit 10 and the compensating power supply generated by the compensating circuit are overlapped in series, namely, the voltage of the direct current power supply and the compensating power supply are added, harmonic waves are mutually counteracted, a standard direct current power supply is generated, and the standard direct current power supply is transmitted to the inverter circuit 30;
optionally, according to the series connection of the dc power supply and the compensation power supply, the output voltage is superimposed as a feedback value, the target voltage is a set value, and the two voltages form closed-loop adjustment, so that the switching on time of the compensation circuit is adjusted, the superimposed voltage is stable and has no harmonic wave, a standard dc power supply is formed, and the standard dc power supply is transmitted to the inverter circuit 30; in addition, the voltage of the standard direct current power supply can be higher than the output voltage peak value of the rectifying circuit, so that the driving capability is stronger.
And an inverter circuit 30 for converting the standard DC power supply into AC power to drive the motor.
Further, referring to fig. 5, fig. 5 is a schematic circuit diagram of an inverter circuit according to the present invention.
As shown in fig. 5, the inverter circuit 30 includes: a sixth insulated gate bipolar transistor Q6, a twelfth diode D12, a seventh insulated gate bipolar transistor Q7, a thirteenth diode D13, an eighth insulated gate bipolar transistor Q8, a fourteenth diode D14, a ninth insulated gate bipolar transistor Q9, a fifteenth diode D15, a tenth insulated gate bipolar transistor Q10, a sixteenth diode D16, an eleventh insulated gate bipolar transistor Q11, and a seventeenth diode D17;
the positive output terminal of the compensation circuit 20 is connected to the collector of the sixth insulated-gate bipolar transistor Q6, the cathode of the twelfth diode D12, the collector of the eighth insulated-gate bipolar transistor Q8, the cathode of the fourteenth diode D14, the collector of the tenth insulated-gate bipolar transistor Q10, and the cathode of the sixteenth diode D16, respectively, the negative output terminal of the rectification circuit 10 is connected to the emitter of the seventh insulated-gate bipolar transistor Q7, the anode of the thirteenth diode D13, the emitter of the ninth insulated-gate bipolar transistor Q9, the anode of the fifteenth diode D15, the emitter of the eleventh insulated-gate bipolar transistor Q11, and the anode of the seventeenth diode D17, the emitter of the sixth insulated-gate bipolar transistor Q6, the anode of the twelfth diode D12, the collector of the seventh insulated-gate bipolar transistor Q7, and the cathode of the thirteenth diode D13 are connected to the U of the motor, the anode of the eighth insulated-gate bipolar transistor Q8, the anode of the fourteenth diode D14, the anode of the thirteenth insulated-gate bipolar transistor Q9, and the anode of the seventeenth diode D15 are connected to the anode of the drain of the seventeenth insulated-gate bipolar transistor Q11, and the drain of the seventeenth diode D16 of the motor are connected to the drain of the seventeenth insulated-gate bipolar transistor Q11.
Further, referring to fig. 6, fig. 6 is a waveform diagram (solid line) of a dc signal output by the rectifying circuit according to the present invention.
As shown in fig. 6, in actual situations, harmonic components, that is, pits, are generated through the rectifying circuit, in fig. 6, the ordinate represents the output voltage value U, the abscissa represents the period T, the voltage maximum value is 220×sqrt (2) ×sqrt (3) =537V, the voltage minimum value is 220×sqrt (2) ×3/2=467v, and after the superposition of the compensating circuit, a smooth waveform is generated, that is, the voltage at all times becomes 537V, and the power is increased by (1/2×537-467) ×t)/537×t=1/15, so that the power is also increased by 1/15 after the compensation of the compensating circuit.
In the embodiment, a frequency converter topology based on harmonic compensation is formed by arranging a rectifying circuit, a compensating circuit and an inverter circuit; the input end of the rectifying circuit is connected with a three-phase power supply, the positive output end of the rectifying circuit is respectively connected with the positive input end of the compensating circuit and the negative output end of the compensating circuit, the negative output end of the rectifying circuit is respectively connected with the negative input end of the compensating circuit and the negative input end of the inverter circuit, the positive output end of the compensating circuit is connected with the positive input end of the inverter circuit, and the output end of the inverter circuit is connected with the motor; the rectification circuit is used for converting initial alternating current provided by the three-phase power supply into direct current power supply and transmitting the direct current power supply to the compensation circuit; the compensation circuit is used for generating a compensation power supply according to the direct current power supply, superposing the direct current power supply and the compensation power supply to generate a standard direct current power supply, and transmitting the standard direct current power supply to the inverter circuit; and the inverter circuit is used for converting the standard direct-current power supply into an alternating-current power supply. According to the embodiment, the voltage rectified by the rectifying circuit is converted through the compensating circuit to generate the compensating voltage, and the compensating voltage is overlapped with the rectified voltage, so that the voltage amplitude can be accurately and effectively adjusted, and the power can be further increased.
Based on the converter topology based on harmonic compensation provided by the invention, a converter topology control method based on harmonic compensation is provided, and referring to fig. 7, fig. 7 is a flow diagram of a first embodiment of the converter topology control method based on harmonic compensation provided by the invention.
In this embodiment, the control method includes:
step S10: the rectification circuit converts initial alternating current provided by the three-phase power supply into direct current power supply and transmits the direct current power supply to the compensation circuit;
the frequency converter used in industry is divided into a single phase and three phases, the single phase and the three phases are distinguished by the voltage supplied by the main loop, the three phases are that the main loop is connected with 380V alternating current of RST three phases, and the output is connected with three phase line UVW for the motor; the single-phase circuit is connected with 220-volt LN alternating current of the single-phase circuit, and outputs the single-phase circuit to the motor by connecting UVW three-phase lines, and the embodiment is preferably a three-phase frequency converter.
It is understood that a three-phase power supply is a power supply consisting of three alternating potentials of the same frequency, equal amplitude and mutually differing in phase by 120 ° in sequence. An electric motor is a device that converts electrical energy into mechanical energy.
Step S20: the compensation circuit generates a compensation power supply according to the direct current power supply, superimposes the direct current power supply and the compensation power supply to generate a standard direct current power supply, and transmits the standard direct current power supply to the inverter circuit;
it is understood that when the dc signal is input to the compensation circuit, the compensation circuit may generate a compensation power according to the dc power, and connect the dc power output by the rectification circuit and the compensation power output by the compensation circuit in series to generate a harmonic-free dc power, that is, a standard dc power.
Step S30: the inverter circuit converts the standard direct current power supply into alternating current to drive the motor.
In the embodiment, the initial alternating current provided by the three-phase power supply is converted into the direct current power supply through the rectifying circuit, the direct current power supply is transmitted to the compensating circuit, the compensating circuit generates the compensating power supply according to the direct current power supply, the direct current power supply and the compensating power supply are overlapped to generate the standard direct current power supply, the standard direct current power supply is transmitted to the inverting circuit, and the inverting circuit converts the standard direct current power supply into alternating current to drive the motor. According to the embodiment, the voltage rectified by the rectifying circuit is converted through the compensating circuit to generate the compensating voltage, and the compensating voltage is overlapped with the rectified voltage, so that the voltage amplitude can be accurately and effectively adjusted, and the power can be further increased.
To achieve the above object, the present invention also proposes a frequency converter comprising a frequency converter topology based on harmonic compensation as described above. The frequency converter adopts all the technical schemes of all the embodiments, so that the frequency converter has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (3)
1. A harmonic compensation-based frequency converter topology, the harmonic compensation-based frequency converter topology comprising: a rectifying circuit, a compensating circuit and an inverting circuit;
the input end of the rectifying circuit is connected with a three-phase power supply, the positive output end of the rectifying circuit is respectively connected with the positive input end of the compensating circuit and the negative output end of the compensating circuit, the negative output end of the rectifying circuit is respectively connected with the negative input end of the compensating circuit and the negative input end of the inverting circuit, the positive output end of the compensating circuit is connected with the positive input end of the inverting circuit, and the output end of the inverting circuit is connected with the motor;
the rectification circuit is used for converting initial alternating current provided by the three-phase power supply into direct current power supply, wherein the voltage of the direct current power supply contains 300Hz harmonic waves, and the direct current power supply is transmitted to the compensation circuit;
the compensation circuit is used for generating a compensation power supply according to the direct current power supply, superposing the direct current power supply and the compensation power supply in series to generate a standard direct current power supply, and transmitting the standard direct current power supply to the inverter circuit;
the inverter circuit is used for converting the standard direct-current power supply into alternating current so as to drive the motor;
the compensation circuit includes: the system comprises a single-phase full-bridge inversion unit, an intermediate frequency transformer and a single-phase full-bridge rectification unit;
the positive input end of the single-phase full-bridge inversion unit is connected with the positive output end of the rectification circuit, the negative input end of the single-phase full-bridge inversion unit is connected with the negative output end of the rectification circuit, the first output end of the single-phase full-bridge inversion unit is connected with the first input end of the intermediate frequency transformer, the second output end of the single-phase full-bridge inversion unit is connected with the second input end of the intermediate frequency transformer, the first output end of the intermediate frequency transformer is connected with the first input end of the single-phase full-bridge rectification unit, the second output end of the intermediate frequency transformer is connected with the second input end of the single-phase full-bridge rectification unit, the positive output end of the single-phase full-bridge rectification unit is connected with the positive input end of the inversion circuit, and the negative output end of the single-phase full-bridge rectification unit is connected with the positive output end of the rectification circuit;
the single-phase full-bridge inversion unit is used for switching on or switching off according to a control signal so as to control the magnitude, the direction and the frequency of the primary side alternating voltage of the intermediate frequency transformer;
the intermediate frequency transformer is used for attenuating the primary side alternating voltage of the intermediate frequency transformer according to the primary side-secondary side turn ratio and transmitting the secondary side of the intermediate frequency transformer to the single-phase full-bridge rectifying unit;
the single-phase full-bridge rectifying unit is used for rectifying the secondary side voltage of the intermediate frequency transformer into direct current voltage;
the compensation circuit includes: an inductor, a first capacitor, a first diode, and a first insulated gate bipolar transistor;
the first end of the inductor is respectively connected with the negative electrode of the first capacitor and the positive output end of the rectifying circuit, the second end of the inductor is respectively connected with the anode of the first diode and the collector of the first insulated gate bipolar transistor, the emitter of the first insulated gate bipolar transistor is connected with the negative output end of the rectifying circuit, and the positive electrode of the first capacitor is respectively connected with the cathode of the first diode and the positive input end of the inverting circuit.
2. A method of controlling a topology of a frequency converter based on harmonic compensation, the method being based on the topology of the frequency converter based on harmonic compensation of claim 1, the method comprising:
the rectification circuit converts initial alternating current provided by the three-phase power supply into direct current power supply and transmits the direct current power supply to the compensation circuit;
the compensation circuit generates a compensation power supply according to the direct current power supply, superimposes the direct current power supply and the compensation power supply to generate a standard direct current power supply, and transmits the standard direct current power supply to the inverter circuit;
the inverter circuit converts the standard direct current power supply into alternating current to drive the motor.
3. A frequency converter comprising a harmonic compensation based frequency converter topology according to claim 1.
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