CN110165919B - Combined three-phase inverter power supply suitable for multiple load forms - Google Patents
Combined three-phase inverter power supply suitable for multiple load forms Download PDFInfo
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- CN110165919B CN110165919B CN201910418787.6A CN201910418787A CN110165919B CN 110165919 B CN110165919 B CN 110165919B CN 201910418787 A CN201910418787 A CN 201910418787A CN 110165919 B CN110165919 B CN 110165919B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Power Engineering (AREA)
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Abstract
A combined three-phase inverter power supply applicable to multiple load forms belongs to the field of switch power supplies. The power supply independently controls the single-phase inversion of the A phase, the B phase and the C phase in the combined three-phase inverter through the full-bridge inversion controllers of the A phase, the B phase and the C phase. The line-based phase voltage is obtained through the calculation of the detection line voltage, the integrated phase voltage obtained by adding the line-based phase voltage and the detection phase voltage proportion of the output end is used as control feedback to carry out the closed-loop control of the inverter power supply, so that the power supply requirement of a three-wire system load can be met, and the power supply requirement of a four-wire system load can be met by carrying out the closed-loop control of the inverter power supply by using the detection phase voltage of the output end as the control feedback. In the combined three-phase inverter, the A-phase, B-phase and C-phase inverse transformation circuits carry out independent direct current power supply and output single-phase sinusoidal alternating current voltage with equal amplitude and equal frequency and phase difference of 120 degrees.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a combined three-phase inverter power supply suitable for multiple load forms.
Background
The inverter can realize the conversion from direct current to alternating current, and is widely applied to the fields of aviation, transportation, industrial manufacturing and the like which need alternating current conversion. With the continuous progress of society, the requirements on the aspects of inverter power level, flexible combination of modular inverter power supplies, unbalanced load capacity and the like are continuously increased, and the combined inverter structure is produced in response to the operation.
Many discussions are made at home and abroad aiming at the combined three-phase inverter. The software and hardware current-limiting protection strategy of the combined three-phase inverter (see the report of electrotechnical science, 2008) provides a software and hardware combined current-limiting control method of the combined inverter, but the control implementation utilizes a dq coordinate system, decoupling in circuit control cannot be achieved, and the output needs a transformer for isolation, so that the cost and the volume are increased. The 'phase-locked control strategy of a combined three-phase inverter' (see the report of electrotechnical science, 2010) provides a method for sampling load voltage of a certain phase, demodulating phase information and independently controlling each phase. A novel 400Hz inverter multi-loop control system (see the Chinese Motor engineering journal, 2010) provides a multi-loop single-phase inverter controller added with a phase loop to independently control each phase circuit of a combined inverter, so that the harmonic distortion rate of output voltage is reduced. In the two methods, decoupling of circuit control is realized, but an isolation transformer is required to be added at the output end, and the volume and the cost are increased.
Disclosure of Invention
The invention aims to provide a combined three-phase inverter power supply suitable for multiple load forms, which can meet the power supply requirements of three-wire system loads and four-wire system loads by selecting different voltage feedback modes.
In order to realize the scheme, the invention is realized by adopting the system shown in fig. 1, and comprises a combined three-phase inverter, an A-phase full-bridge inverter controller, a B-phase full-bridge inverter controller and a C-phase full-bridge inverter controller.
The combined three-phase inverter comprises a single-phase inverter bridge module, a line voltage detection module, an inverter output end phase voltage detection module and a load form switching module.
The A-phase full-bridge inverter controller comprises a four-wire system phase voltage feedback module, a three-wire system phase voltage feedback module and a digital control module, and the internal composition structures of the A-phase full-bridge inverter controller, the B-phase full-bridge inverter controller and the C-phase full-bridge inverter controller are the same.
The A-phase full-bridge inverter controller, the B-phase full-bridge inverter controller and the C-phase full-bridge inverter controller respectively and independently control the single-phase inverter bridge A, the single-phase inverter bridge B and the single-phase inverter bridge C in the single-phase inverter bridge module.
The single-phase inverter bridge A, the single-phase inverter bridge B and the single-phase inverter bridge C in the single-phase inverter bridge module are respectively composed of a UDC1、UDC2、UDC3Independent direct current power supply is carried out, single-phase sinusoidal alternating current voltage is respectively output by the A phase, the B phase and the C phase in the combined three-phase inverter, and the phase difference between every two phases is 120 degrees.
Phase voltage U detected by the inverter output end phase voltage detection module and the line voltage detection moduleA0And line voltage UAB、UCATransmitting the signals to an A-phase full-bridge inverter controller, and outputting PWM1, PWM2, PWM3 and PWM4 four-way PWM signals to control a power switch tube S in a single-phase inverter bridge module1、S2、S3、S4Make-and-break; phase voltage U detected by the inverter output end phase voltage detection module and the line voltage detection moduleB0And line voltage UBC、UABTransmitting the signals to a B-phase full-bridge inverter controller, and outputting PWM5, PWM6, PWM7 and PWM8 four-way PWM signals to control a power switch tube S in a single-phase inverter bridge module5、S6、S7、S8Make-and-break; phase voltage U detected by the inverter output end phase voltage detection module and the line voltage detection moduleC0And line voltage UCA、UBCTransmitting the signals to a C-phase full-bridge inverter controller, and outputting PWM9, PWM10, PWM11 and PWM12 four-way PWM signals to control a power switch tube S in a single-phase inverter bridge module9、S10、S11、S12Make and break of (2).
The combined three-phase inverter power supply can meet the power supply requirements of five load forms including single-phase load power supply, three-phase three-wire system load power supply, three-phase four-wire system load power supply, three-phase three-wire system load and single-phase load power supply, and three-phase four-wire system load and single-phase load power supply by selectively using different phase voltage feedback modules.
When the four-wire system phase voltage feedback module is selected for use, the combined three-phase inverter power supply can meet the power supply requirements of four-wire system series loads, namely three load power supply requirements of three-phase four-wire system loads, single-phase loads and three-phase four-wire system loads and single-phase loads for supplying power simultaneously; when the three-wire system phase voltage feedback module is selected for use, the combined three-phase inverter power supply can meet the power supply requirements of three-wire system loads, namely three-phase three-wire system load power supply, single-phase load power supply and three-phase three-wire system load and single-phase load power supply in three load modes.
A four-wire system phase voltage feedback module in an A-phase full-bridge inverter controller receives a detection phase voltage U from an inverter output end phase voltage detection moduleA0When the four-wire system series load needs to be supplied with power, the phase voltage U is detected at the inversion output end through the selection of the A-phase full-bridge inversion controllerA0Phase voltage feedback input U selected as phase A digital control moduleAFED。
The three-wire system voltage feedback module in the A-phase full-bridge inverter controller receives the detection wire voltage U from the wire voltage detection moduleAB、UCAAs the input of the phase voltage calculation module, the output line outputs the basic phase voltage U after calculationALLine voltage UAB、UCAAnd line fundamental voltage UALIs transformed into
Line fundamental voltage UALDetecting phase voltage U with inversion output terminalA0Adding the phase voltages at a proper proportion to obtain an integrated phase voltage UAWhen power supply is needed for the three-wire system load, the phase voltage U is integrated through selection of the A-phase full-bridge inverter controllerAPhase voltage feedback U selected as phase A digital control moduleAFEDAnd (4) inputting.
Wherein the integrated phase voltage UAIs calculated by the formula
UA＝UA0·p+UAL·(1-p)
In the formula, p is a proportionality coefficient, and 0< p <1, the magnitude of p of the proportionality coefficient can be adjusted according to the actual waveform condition, when the phase voltage of the output end of the inverter needs to be improved, the proportionality coefficient p is increased to increase the compromise degree of phase voltage feedback detected by the inverter output end, when the voltage of the output end of the three-wire system needs to be improved, the proportionality coefficient p is decreased to increase the compromise degree of line-based phase voltage feedback, so that the combined three-phase inverter can meet the requirement of supplying power to a three-wire system load and can output a single-phase sinusoidal voltage with a sinusoidal distortion rate less than 5.
The digital control module receives a phase voltage feedback signal UAFEDAnd phase voltage given signal UAREFAnd then, the voltage closed-loop control module performs closed-loop control and outputs a modulation wave as the input of the PWM modulation module, and the PWM modulation module outputs four paths of PWM signals to control the on-off of a power switch tube in the single-phase inverter bridge A.
The control mode of the B-phase full-bridge inverter controller and the C-phase full-bridge inverter controller is the same as that of the A-phase full-bridge inverter controller, corresponding four paths of PWM signals are respectively output to control the on-off of power switching tubes in the single-phase inverter bridge B and the single-phase inverter bridge C, and the calculation formulas of the line-based phase voltage and the integrated phase voltage are respectively
UB＝UB0·p+UBL·(1-p)
UC＝UC0·p+UCL·(1-p)
In the formula of UBL、UCLLine base voltages of phase B and phase C, UB、UCThe phase voltage is integrated with the phase B and the phase C respectively.
Compared with the prior art, the invention has the advantages that a heavy power frequency isolation transformer does not need to be added at the output end of the combined three-phase inverter, the system volume is reduced, the power density is improved, and the cost is saved; the power supply requirements of five load forms of single-phase load power supply, three-phase three-wire system load power supply, three-phase four-wire system load power supply, three-phase three-wire system load and single-phase load power supply at the same time and three-phase four-wire system load and single-phase load power supply at the same time can be met.
Drawings
FIG. 1 is a block diagram of a combined three-phase inverter power system
Detailed Description
The invention provides a combined three-phase inverter power supply suitable for multiple load forms, which can meet the power supply requirements of three-wire system loads and four-wire system loads by selecting different phase voltage feedback modes for control, and the specific implementation mode is as follows:
fig. 1 shows a system block diagram of the combined three-phase inverter power supply, which includes four parts, namely a combined three-phase inverter (1), an a-phase full-bridge inverter controller (2), a B-phase full-bridge inverter controller (3), and a C-phase full-bridge inverter controller (4).
The combined three-phase inverter (1) comprises four parts, namely a single-phase inverter bridge module (1-1), a line voltage detection module (1-2), an inverter output end phase voltage detection module (1-3) and a load form switching module (1-4), wherein the single-phase inverter bridge module comprises a single-phase inverter bridge A, a single-phase inverter bridge B and a single-phase inverter bridge C.
The single-phase inverter bridge A, the single-phase inverter bridge B and the single-phase inverter bridge C respectively pass through the UDC1、UDC2、UDC3And carrying out independent direct current power supply.
The A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) respectively independently control the single-phase inverter bridge A, the single-phase inverter bridge B and the single-phase inverter bridge C in the single-phase inverter bridge module (1-1).
The overall control process of the combined three-phase inverter power supply is as follows:
phase voltage U detected by output end phase voltage detection modules (1-3) and line voltage detection modules (1-2) in combined three-phase inverter (1)A0And line voltage UAB、UCAThe signal is transmitted to an A-phase full-bridge inverter controller (2), and after a series of control processing of the controller, four paths of PWM signals of PWM1, PWM2, PWM3 and PWM4 are output to control a power switch tube S in a single-phase inverter bridge module (1-1)1、S2、S3、S4Turn on and turn off;
phase voltage U detected by output end phase voltage detection modules (1-3) and line voltage detection modules (1-2) in combined three-phase inverter (1)B0And line voltage UBC、UABThe signal is transmitted to a B-phase full-bridge inverter controller (3), and after a series of control processing of the controller, four paths of PWM signals of PWM5, PWM6, PWM7 and PWM8 are output to control a power switch tube S in a single-phase inverter bridge module (1-1)5、S6、S7、S8Turn on and turn off;
phase voltage U detected by output end phase voltage detection modules (1-3) and line voltage detection modules (1-2) in combined three-phase inverter (1)C0And line voltage UCA、UBCThe signal is transmitted to a C-phase full-bridge inverter controller (4), and after a series of control processing of the controller, four paths of PWM signals of PWM9, PWM10, PWM11 and PWM12 are output to control a power switch tube S in a single-phase inverter bridge module (1-1)9、S10、S11、S12On and off.
The control modes of the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) are the same, so that the control mode of each phase inverter module is explained by taking the A-phase full-bridge inverter controller (2) as a main mode.
The A-phase full-bridge inverter controller (2) comprises a four-wire system phase voltage feedback module (2-1), a three-wire system phase voltage feedback module (2-2) and a digital control module (2-3), and the internal composition structures of the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) are the same as those of the A-phase full-bridge inverter controller (2).
An inverter output end phase voltage detection module (1-3) in the combined three-phase inverter (1) detects an inverter output end phase voltage UA0The signal is transmitted to a four-wire system phase voltage feedback module in an A-phase full-bridge inverter controller (2), and when the load form is a four-wire system series load form, the A-phase full-bridge inverter controller (2) controls K2Is closed and K3Disconnecting the inverter, and detecting phase voltage U at the inverter output endA0Phase voltage reversal as a phase a closed loop controlFeed UAFED。
The line voltage detection module (1-2) in the combined three-phase inverter (1) detects the line voltage UAB、UCAThe signal is transmitted to a three-wire system phase voltage feedback module in an A-phase full-bridge inverter controller (2), and a wire-based phase voltage U is calculated and obtained through a phase voltage calculation moduleALLine voltage UAB、UCAAnd line fundamental voltage UALIs transformed into
The line fundamental voltage UALDetecting phase voltage U with inversion output terminalA0Adding the phase voltages at a proper proportion to obtain an integrated phase voltage UAWhen the load form is a three-wire system load form, the A-phase full-bridge inverter controller (2) controls K2Is disconnected and K3Closed to integrate the phase voltage UAPhase voltage feedback U as phase A closed loop controlAFEDIntegrating the phase voltage UAIs calculated by the formula
UA＝UA0·p+UAL·(1-p)
In the formula, p is a proportionality coefficient, 0< p <1, and the degree of consideration of feedback forms of two types of phase voltages, namely the inverter output end detection phase voltage and the line-based phase voltage, can be adjusted by adjusting the magnitude of p of the proportionality coefficient according to the condition of the output waveform in practice.
When the voltage of the output end of the inverter needs to be improved, the proportionality coefficient p value is increased to increase the compromise degree of the voltage feedback of the detection phase of the inverter output end, and when the voltage of the output end of the three-wire system needs to be improved, the proportionality coefficient p value is decreased to increase the compromise degree of the voltage feedback of the line-based phase, so that the combined three-phase inverter can meet the requirement of power supply of a three-phase three-wire system load and can output a single-phase sinusoidal voltage with a sinusoidal distortion rate of less than 5% at the inverter output end to supply power to a single-phase load.
The digital control module (2-3) receives phase voltageFeedback signal UAFEDAnd phase voltage given signal UAREFThen, the U is putAFEDAnd UAREFTransmitting the voltage to a voltage closed-loop control module for closed-loop control, and outputting a modulation wave to a PWM modulation module to generate PWM1, PWM2, PWM3 and PWM4 four-way PWM signals to control a power switch tube S of a single-phase inverter bridge A in a single-phase inverter bridge module (1-1)1、S2、S3、S4On and off.
As shown in fig. 1, the B-phase full-bridge inverter controller (3) is controlled in the same manner as the a-phase full-bridge inverter controller (2), and receives the inverter output phase voltage U detected by the inverter output phase voltage detection module (1-3) and the line voltage detection module (1-2)B0And line voltage UBC、UABThe signal is controlled and regulated by the same control as the A-phase full-bridge inverter controller (2), and then four PWM signals of PWM5, PWM6, PWM7 and PWM8 are output to control a power switch tube S of a single-phase inverter bridge B in the single-phase inverter bridge module (1-1)5、S6、S7、S8On and off of which line base voltage UBLAnd integrated phase voltage UBIs calculated by the formula
UB＝UB0·p+UBL·(1-p)
As shown in fig. 1, the C-phase full-bridge inverter controller (4) is controlled in the same manner as the a-phase full-bridge inverter controller (2), and receives the inverter output phase voltage U detected by the inverter output phase voltage detection module (1-3) and the line voltage detection module (1-2)C0And line voltage UCA、UBCThe signal is controlled and regulated by the same control as the A-phase full-bridge inverter controller (2), and then four PWM signals of PWM9, PWM10, PWM11 and PWM12 are output to control a power switch tube S of a single-phase inverter bridge C in the single-phase inverter bridge module (1-1)9、S10、S11、S12On and off of which line base voltage UCLAnd integrated phase voltage UCIs calculated by the formula
UC＝UC0·p+UCL·(1-p)
A phase A, a phase B and a phase C in the combined three-phase inverter (1) respectively output single-phase sinusoidal alternating-current voltages with equal amplitude and same frequency, and a phase difference of 120 degrees is fixed between each phase.
The combined three-phase inverter power supply can meet the power supply requirements of five load forms including single-phase load power supply, three-phase three-wire system load power supply, three-phase four-wire system load power supply, three-phase three-wire system load and single-phase load power supply simultaneously, and three-phase four-wire system load and single-phase load power supply simultaneously by selectively using different phase voltage feedback modules through the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4).
When the load form switches module (1-4) K as shown in FIG. 13When the system is closed, namely the load is in a four-wire system series load form, at the moment, the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) select a four-wire system phase voltage feedback module to enable the system to operate in a four-wire system phase voltage feedback mode, phase voltages detected by the inverter output end phase voltage detection modules (1-3) are selected to be directly used as phase voltage feedback of closed-loop control, and the power supply requirements of three load forms, namely three-phase four-wire system load power supply, single-phase load power supply and three-phase four-wire system load and single-phase load power supply at.
When the load form switches module (1-4) K as shown in FIG. 13When the system is disconnected, namely the load is in a three-wire system series load form, at the time, the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) select the three-wire system phase voltage feedback module to enable the system to operate in a three-wire system phase voltage feedback mode, the three-phase system phase voltage feedback module calculates and processes the phase voltage received from the inverter output end phase voltage detection module (1-3) and the line voltage received from the line voltage detection module (1-2) to obtain an integrated phase voltage, and the integrated phase voltage is selected to be used as a closed-loop controlledPhase voltage feedback can meet the power supply requirements of three load modes, namely three-phase three-wire system load power supply, single-phase load power supply and three-phase three-wire system load and single-phase load power supply at the same time.
Claims (2)
1. A combined three-phase inverter power supply suitable for multiple load forms is characterized in that: the power supply includes: the system comprises a combined three-phase inverter (1), an A-phase full-bridge inverter controller (2), a B-phase full-bridge inverter controller (3) and a C-phase full-bridge inverter controller (4);
a combined three-phase inverter (1) comprises: the system comprises a single-phase inverter bridge module (1-1), a line voltage detection module (1-2), an inverter output end phase voltage detection module (1-3) and a load form switching module (1-4);
a phase, B phase and C phase in the combined three-phase inverter (1) respectively output single-phase sinusoidal alternating-current voltages with equal amplitude and same frequency, and the phase difference between each phase is 120 degrees;
the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) respectively control the single-phase inverter bridge A, the single-phase inverter bridge B and the single-phase inverter bridge C in the single-phase inverter bridge module (1-1) independently;
the inverter output end phase voltage detection module (1-3) and the line voltage detection module (1-2) are used for converting the inverter output end phase voltage UA0And line voltage UAB、UCAThe signal is transmitted to an A-phase full-bridge inverter controller (2), and the A-phase full-bridge inverter controller (2) outputs PWM1, PWM2, PWM3 and PWM4 four-way PWM signals to control a power switch tube S in a single-phase inverter bridge module (1-1)1、S2、S3、S4Turn on and turn off;
the inverter output end phase voltage detection module (1-3) and the line voltage detection module (1-2) are used for converting the inverter output end phase voltage UB0And line voltage UBC、UABThe signal is transmitted to a B-phase full-bridge inverter controller (3), and the B-phase full-bridge inverter controller (3) outputs PWM5, PWM6, PWM7 and PWM8 four-path PWM signals to control a power switch tube S in a single-phase inverter bridge module (1-1)5、S6、S7、S8Turn on and turn off;
the inverter output end phase voltage detection module (1-3) and the line voltage detection module (1-2) are used for converting the inverter output end phase voltage UC0And line voltage UCA、UBCThe signal is transmitted to a C-phase full-bridge inverter controller (4), and the C-phase full-bridge inverter controller (4) outputs PWM9, PWM10, PWM11 and PWM12 four-path PWM signals to control a power switch tube S in a single-phase inverter bridge module (1-1)9、S10、S11、S12Turn on and turn off;
the A-phase full-bridge inverter controller (2) comprises: the device comprises a four-wire system phase voltage feedback module (2-1), a three-wire system phase voltage feedback module (2-2) and a digital control module (2-3);
the internal structures of the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) are the same;
the combined three-phase inverter power supply can meet the power supply requirements of five load forms, namely, single-phase load power supply, three-phase three-wire system load power supply, three-phase four-wire system load power supply, three-phase three-wire system load power supply and single-phase load power supply, and three-phase four-wire system load and single-phase load power supply, by selectively using different phase voltage feedback modules by the A-phase full-bridge inverter controller (2), the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4);
the combined inverter (1) supplies power for a three-phase four-wire system load, or selects and uses four-wire system phase voltage feedback modules in an A-phase full-bridge inverter controller (2), a B-phase full-bridge inverter controller (3) and a C-phase full-bridge inverter controller (4) when the three-phase four-wire system load and a single-phase load supply power simultaneously;
when the combined inverter (1) only supplies power for a single-phase load, four-wire system phase voltage feedback modules in an A-phase full-bridge inverter controller (2), a B-phase full-bridge inverter controller (3) and a C-phase full-bridge inverter controller (4) are selected to be used;
the combined inverter (1) supplies power for a three-phase three-wire system load, or selects a three-wire system phase voltage feedback module in an A-phase full-bridge inverter controller (2), a B-phase full-bridge inverter controller (3) and a C-phase full-bridge inverter controller (4) when the three-phase three-wire system load and a single-phase load supply power simultaneously;
the A-phase full-bridge inversion controller (2) receives the inversion output end phase voltage U of the inverter output end phase voltage detection module (1-3)A0Then, the U is putA0The voltage is transmitted to a four-wire system phase voltage feedback module (2-1);
the A-phase full-bridge inverter controller (2) receives the line voltage U detected by the line voltage detection module (1-2)AB、UCAThen, the U is putAB、UCATransmitting the voltage to a three-wire system phase voltage feedback module (2-2), and outputting a line base voltage U through a phase voltage calculation moduleALIs transformed into a formula
The line fundamental voltage UALPhase voltage U with inversion output endA0Proportional addition is carried out to obtain an integrated phase voltage UAThe calculation formula is
UA＝UA0·p+UAL·(1-p)
Wherein p is a scaling factor and 0< p < 1;
when the power supply is carried out for a three-phase four-wire system load, or the power supply is carried out for the three-phase four-wire system load and a single-phase load simultaneously, or the power supply is only carried out for the single-phase load, the phase voltage U of the inverted output end is selected by the A-phase full-bridge inversion controller (2)A0Phase voltage feedback U as phase A closed loop controlAFED；
When the three-phase three-wire system load is supplied with power or the three-phase three-wire system load and the single-phase load are supplied with power simultaneously, the phase voltage U is integrated through the selection of the A-phase full-bridge inverter controller (2)APhase voltage feedback U as phase A closed loop controlAFED；
The digital control module (2-3) receives a phase voltage feedback signal UAFEDAnd phase voltage given signal UAREFThen, a voltage closed-loop control module outputs a modulation wave to a PWM modulation module to generate four paths of PWM signals to control the on and off of four power switching tubes of a single-phase inverter bridge A;
the control modes of the B-phase full-bridge inverter controller (3) and the C-phase full-bridge inverter controller (4) are the same as those of the A-phase full-bridge inverter controller (2), and the calculation formulas of the line fundamental voltage and the integrated phase voltage are respectively
UB＝UB0·p+UBL·(1-p)
UC＝UC0·p+UCL·(1-p)
In the formula of UBL、UCLLine base voltages of phase B and phase C, UB、UCThe phase voltage is integrated with the phase B and the phase C respectively.
2. A combined three-phase inverter power supply for multiple loads according to claim 1, wherein: the proportionality coefficient p in the three-wire system phase voltage feedback module (2-2) is selected according to the output voltage waveform condition of the combined three-phase inverter power supply, when the phase voltage of the output end of the inverter needs to be improved, the proportionality coefficient p is increased to increase the compromise degree of phase voltage feedback detected by the inverter output end, and when the voltage of the three-wire system output line needs to be improved, the proportionality coefficient p is decreased to increase the compromise degree of line-based phase voltage feedback, so that the combined three-wire system phase voltage inverter can meet the requirement of three-wire system load power supply and can output single-phase sinusoidal voltage with sinusoidal distortion rate.
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