WO2017211195A1

WO2017211195A1 - Reconfigurable single-phase digital frequency-variable generator

Info

Publication number: WO2017211195A1
Application number: PCT/CN2017/086034
Authority: WO
Inventors: 张雄蜂
Original assignee: 维尔纳（福建）电机有限公司
Priority date: 2016-06-07
Filing date: 2017-05-26
Publication date: 2017-12-14
Also published as: CN107086805B; CN105826951A; ZA201808010B; CN107086805A

Abstract

Disclosed is a reconfigurable single-phase digital frequency-variable generator, comprising an editable phase signal generator, several single-phase frequency converters and an independent power supply generator connected to the single-phase frequency converters. The single-phase frequency converters comprise a phase synchroniser, a sine-wave signal generator with phase locking, an automatic gain control module, an SPWM modulation module, an isolation drive module and an H bridge output module which are successively connected. The editable phase signal generator is connected to the phase synchroniser of each single-phase frequency converter. The connection mode of an output end of an H bridge output module of the several single-phase frequency converters is any one of series connection, parallel connection, star-shaped connection and annular connection. In the reconfigurable single-phase digital frequency-variable generator, single-phase frequency conversion reconfiguration is performed on an independent power supply generator by means of a single-phase frequency converter, an output mode is changed, and power expansion is achieved so as to satisfy any power requirement application.

Description

Reconfigurable single-phase digital variable frequency generator

Technical field

The invention relates to a power supply, in particular to a reconfigurable single-phase digital variable frequency generator.

Background technique

In independently powered generator applications, the generator that provides this power is often selected based on the rated power of the required supply load. When the rated power of the required power supply load is small, the generator can be powered by high power or a generator corresponding to its power. When the rated power of the required power supply load is large, only the generator with higher power supply can be selected to supply power. However, in most generator applications, there will be a single load that increases the total power consumption due to the increased load or that has a large power during the application process, and further requires high-power power supply; or multi-phase power supply due to load requirements. For the above cases, the existing method is to purchase a generator with a larger power or to replace the output phase with the same load, which greatly increases the purchase cost of the power supply equipment.

Summary of the invention

It is an object of the present invention to provide a reconfigurable single phase digital variable frequency generator.

In order to achieve the object of the present invention, the technical solution thereof is described in detail: a reconfigurable single-phase digital variable frequency generator, including an editable phase signal generator, a plurality of single-phase frequency converters, and an independent power supply connection with a single-phase frequency converter. The single-phase frequency converter includes a phase synchronizer connected in sequence, a sine wave signal generator with phase lock, an automatic gain control module, an SPWM modulation module, an isolated driving module and an H-bridge output module, and the automatic gain control module The voltage feedback module and the current feedback module are further connected to the H-bridge output module, and the editable phase signal generator is connected to the phase synchronizer of each single-phase inverter, and the plurality of singles The output terminals of the H-bridge output modules of the phase inverter are connected in series, in parallel, in a star connection, or in a ring connection.

Further, several single-phase inverters are evenly divided into several groups of units, and the output ends of the H-bridge output modules of several single-phase inverters in several groups are sequentially connected in series, and the output ends of several groups of units are sequentially connected in parallel or in a star shape or Connected in a ring.

Further, a plurality of single-phase inverters are evenly divided into several groups of units, and output terminals of the H-bridge output modules of several single-phase inverters in several groups are connected in parallel, and the output ends of the plurality of units are connected in series or in a star shape or in series. Ring connected.

Further, several single-phase inverters are evenly divided into several groups of units, and the output ends of the H-bridge output modules of several single-phase inverters in several groups of units are connected in a star shape or in a ring shape, and the output ends of several groups of units are sequentially connected in parallel.

The reconfigurable single-phase digital frequency conversion generator of the invention, the editable phase signal generator passes several single-phase frequency conversion The output electrical signals of several independent power supply generators are phase-locked, fixed-frequency, and fixed, and the voltages are superimposed in series, or the currents are superimposed in parallel, or connected in a star or ring shape to form a multi-phase electrical output. Finally, a single single-phase high-voltage or high-current output generator or a single multi-phase alternator is formed, which uses a single-phase inverter to independently recombine the single-phase inverter to change the output mode to achieve power expansion to meet any power. Demand application.

DRAWINGS

Figure 1 is a functional block diagram of a first embodiment of the present invention;

2 is a diagram showing relationship of a control electric signal of an editable phase signal generator to a phase synchronizer of each single-phase inverter according to a first embodiment of the present invention;

3 is a diagram showing relationship between electrical signal voltages at the output end of an H-bridge output module of each single-phase inverter according to the first embodiment of the present invention;

4 is a diagram showing voltage versus output of an output terminal of a plurality of single-phase inverters connected in series according to a first embodiment of the present invention;

Figure 5 is a functional block diagram of a second embodiment of the present invention;

Figure 6 is a functional block diagram of a third embodiment of the present invention;

7 is a diagram showing relationship of a control electric signal of an editable phase signal generator to a phase synchronizer of each single-phase inverter according to a third embodiment of the present invention;

8 is a diagram showing relationship between electrical signal voltages outputted by respective output ends of a plurality of single-phase inverters of a single-phase inverter according to a third embodiment of the present invention;

Figure 9 is a functional block diagram of a fourth embodiment of the present invention;

Where t denotes time, u denotes an electrical signal, t0 denotes the time when the editable phase signal generator first sends a control signal to the phase synchronizer of the single-phase inverter, and T denotes the alternating current signal outputted by the output of the H-bridge output module The cycle, a, b respectively correspond to the output terminals of several single-phase inverter H-bridge output modules, and A, B and C respectively correspond to several single-phase inverters. The output terminals of the H-bridge output modules are star-connected and connected in a ring-shaped recombination. .

detailed description

1 shows a reconfigurable single-phase digital variable frequency generator of the present invention, as shown in FIG. 1, a reconfigurable single-phase digital variable frequency generator, including an editable phase signal generator 1, and a plurality of single-phase inverters 2 And an independent power supply generator 3 connected to the single-phase frequency converter 2, the single-phase frequency converter 2 includes a phase synchronizer 21 connected in sequence, a sine wave signal generator 22 with phase lock, an automatic gain control module 23, and SPWM modulation The module 24, the isolated driving module 25 and the H-bridge output module 26, the automatic gain control module 23 includes a voltage feedback module 231 and a current feedback module 232, and the voltage feedback module 231 and the current feedback module 232 and the H-bridge output module 26, respectively. Connected, the editable phase signal generator 1 is connected to the phase synchronizer 21 of each single-phase frequency converter 2, and the output of the H-bridge output module 26 of several single-phase frequency converters 2 The ends are connected in series.

In the first embodiment of the present invention, the editable phase signal generator 1 serves as a total control function; each of the independent power supply generators 3 supplies power to the corresponding single-phase frequency converter 2; the voltage feedback module 231 of the automatic gain control module 23 and The current feedback module 232 is used for output feedback of the H-bridge output module 26. According to the feedback, the automatic gain control module 23 adjusts the sine wave signal generated by the phase-locked sine wave signal generator 22, and finally causes each H-bridge output module. The output voltage of the output of 26 is the same as the voltage and current of the electrical signal; the SPWM modulation module 24 triggers the H-bridge output module 26 through the isolating drive module 25, so that the H-bridge output module 26 acts as an inverter and outputs an alternating current signal. In operation, the editable phase signal generator 1 unidirectionally controls the phase synchronizer 21 of each single-phase frequency converter 2, and the phase synchronizer 21 transmits a corresponding signal to the phase-locked sine wave signal generator 22 to enable phase-locked The sine wave signal generator 22 outputs an associated sine wave signal. The sine wave signal is adjusted by the automatic gain control module 23 and sent to the SPWM modulation module 24. The SPWM modulation module 24 drives the H-bridge output module 26 through the isolation drive module 25 to make the H-bridge. The output end of the output module 26 outputs an electric signal corresponding to the phase, the frequency, the voltage and the current, and the electric signals of the plurality of single-phase inverters 2 are connected in series to complete the superposition of the voltages to achieve power expansion.

Specifically, as shown in FIG. 2, the editable phase signal generator 1 transmits the same control electric signal to the phase synchronizer 21 of each single-phase inverter 2 at the same time, and the same control electric signal finally causes each single-phase frequency conversion. The sine wave signal generated by the sine wave signal generator 22 has the same frequency and amplitude; and the control electric signal transmitted at the same time causes the sine wave signal generated by the sine wave signal generator 22 to have the same phase. Finally, each single-phase inverter sine wave signal generator 22 generates exactly the same sine wave signal, so that the phase and frequency of the electrical signals outputted by the output of each single-phase inverter H-bridge output module 26 are the same, even if each H-bridge The electrical signal outputted from the output of the output module 26 is phase-locked and fixed-frequency; the same sine wave signal generated by each single-phase inverter sine wave signal generator 22 passes through the automatic gain control module 23, and is in the automatic gain control module voltage feedback module 231. And the feedback of the current feedback module 232, the sine wave signal amplitude sent to each single-phase inverter SPWM modulation module 24 is adjusted, and the single-phase inverter H bridge output driven by the SPWM modulation module 24 is output. The module 26 can realize high-amplitude electric signal reduction in the case where the respective independent power supply generators 3 input different amplitude electric signals, that is, the H-bridge output module 26 driven by each SPWM modulation module 24 finally realizes the inverter output, and The amplitude of each AC signal outputted at the output is the same. Thus, the phase, frequency, voltage and current of the electrical signals outputted by the output terminals of the respective H-bridge output modules 26 are the same, satisfying the conditions of series-parallel connection, as shown in FIG. 3, the outputs of the H-bridge output modules 26 of the single-phase inverters are shown in FIG. The output AC signal changes exactly the same over time.

As shown in FIG. 4, after the output ends of the phase synchronizer H-bridge output modules 26 are connected in series, the output electrical signals realize superposition of voltages, that is, voltage values increase.

Figure 5 shows a second embodiment of a reconfigurable single phase digital variable frequency generator of the present invention. In the first aspect of the invention In the two embodiments, the outputs of the H-bridge output modules 26 of the plurality of single-phase inverters 2 are sequentially connected in parallel. The other structure is the same as that of the embodiment 1.

In the second embodiment of the present invention, the alternating current signals outputted by the output terminals of the single-phase inverter H-bridge output module 26 are completely the same as time, that is, the alternating current signals outputted by the output ends of the respective H-bridge output modules 26 are The phase, the frequency and the amplitude are the same, and the specific implementation process is the same as that in the first embodiment. In the second embodiment of the present invention, the electrical signals of the same phase, frequency, voltage and current outputted by the output terminals of the single-phase inverter H-bridge output module 26 are connected in parallel to complete the superposition of the currents to achieve power expansion.

Figure 6 shows a third embodiment of a reconfigurable single phase digital variable frequency generator of the present invention. In a third embodiment of the invention, the outputs of the H-bridge output modules 26 of the plurality of single-phase frequency converters 2 are connected in a star shape. The other structure is the same as that of the embodiment 1.

In a third embodiment of the present invention, the output signals of the output terminals of the single-phase inverter H-bridge output module 26 are the same, and the electrical signals having the same phase and phase difference are connected in a star shape to form a multi-phase electrical output. Change the output mode to achieve power expansion.

Specifically, as shown in FIG. 7, the editable phase signal generator 1 respectively transmits the same control electric signal to the phase synchronizer 21 of each single-phase inverter 2 at a plurality of different time points, and the same control electric signal makes each single The frequency and amplitude of the sine wave signal generated by the phase converter sine wave signal generator 22 are the same; and the number of different time points is the same as the number of the single-phase frequency converter 2, and the time difference between adjacent time points is the same, and Except for the first time point, the remaining time points are the first cycle of the sine wave signal generated by the sine wave signal generator 22 corresponding to the single-phase inverter after the control phase signal generator 1 transmits the control electric signal at the first time point. For the equalization point, the first period of the sine wave signal is equally divided according to the number of the single-phase inverters 2, so that the sinusoidal signal generators 22 generate sinusoidal signals with a phase difference of a certain angle. Further, each sine wave signal generator 22 generates sinusoidal signals with the same frequency and different phases to ensure that the output signals of the output terminals of the H-bridge output modules 26 of the single-phase inverters have the same frequency and different phases; each single-phase inverter The sine wave signal generated by the sine wave signal generator 22 passes through the automatic gain control module 23, and is sent to each single-phase inverter SPWM modulation module 24 under the feedback adjustment of the automatic gain control module voltage feedback module 231 and the current feedback module 232. The sinusoidal signal amplitude is worth adjusting, so that the single-phase inverter H-bridge output modules 26 driven by the SPWM modulation module 24 can achieve high amplitudes when the respective independent power supply generators 3 input different amplitude electrical signals. The value of the electrical signal is reduced. Finally, the H-bridge output module 26 driven by each SPWM modulation module 24 is inverted, and the amplitudes of the AC signals outputted by the output terminals are the same. In this way, the electrical signals outputted by the output ends of the H-bridge output modules 26 are satisfied to be connected in a star shape and connected in a ring shape. As shown in FIG. 8, the AC signals outputted from the output terminals of the H-bridge output modules 26 of the single-phase inverters are shown in FIG. The frequency, voltage and current are the same, the phases are different, and the multiphase electrical output is formed after recombination.

Figure 9 shows a fourth embodiment of a reconfigurable single phase digital variable frequency generator of the present invention. In a fourth embodiment of the invention, the outputs of the H-bridge output modules 26 of the plurality of single-phase frequency converters 2 are connected in a ring. The other structure is the same as that of the embodiment 1.

In the fourth embodiment of the present invention, the electrical signals outputted by the output terminals of the H-bridge output modules 26 of the single-phase inverter have the same frequency, voltage and current, and the phases are different by a certain angle. The specific implementation process is the same as that of the third embodiment. The electrical signals outputted by the output terminals of the H-bridge output modules 26 of several single-phase inverters are connected in a ring shape to form a multi-phase electrical output, and the output multi-phase power is different from the multi-phase electrical output of the third embodiment only in the amplitude of the electrical signals. Change the output mode and finally achieve power expansion.

The reconfigurable single-phase digital frequency conversion generator of the invention can edit the phase signal generator 1 through a plurality of single-phase frequency converters 2, so that the output electrical signals of the plurality of independent power supply generators 3 are phase-locked, fixed-frequency, fixed, and connected in series. The superposition of voltages, or the superposition of currents in parallel, or in a star or ring connection to form a multiphase electrical output, which ultimately constitutes a single single-phase high-voltage or high-current output generator or a single multi-phase alternator that passes The single-phase inverter 2 will recombine the single-phase inverter of the independent power supply generator 3, change the output mode, and realize power expansion to meet any power demand application.

The reconfigurable single-phase digital frequency conversion generator of the invention, the plurality of single-phase frequency converters 2 can be evenly divided into several groups of units, and the output ends of the H-bridge output modules 26 of the plurality of single-phase frequency converters 2 in the plurality of units can be connected in series. The output ends of several groups of units are connected in parallel or in a star shape or in a ring shape; the output ends of the H-bridge output modules 26 of several single-phase frequency converters 2 in several groups of units may be sequentially connected in parallel, and the output ends of several groups of units are connected in series. Or connected in a star shape or in a ring shape; the output ends of the H-bridge output modules 26 of the plurality of single-phase frequency converters 2 in the plurality of units may be connected in a star shape or in a ring shape, and the output ends of the plurality of units are sequentially connected in parallel. According to the needs of practical applications, several single-phase inverters 2 can be combined in series, parallel, star-connected or ring-connected.

Claims

A reconfigurable single-phase digital variable frequency generator, comprising: an editable phase signal generator, a plurality of single-phase frequency converters and an independent power supply generator connected with the single-phase frequency converter, wherein the single-phase frequency converter comprises a connected phase synchronizer, a phase-locked sine wave signal generator, an automatic gain control module, an SPWM modulation module, an isolated drive module, and an H-bridge output module, the automatic gain control module including a voltage feedback module and a current feedback module The voltage feedback module and the current feedback module are also respectively connected to the H-bridge output module, and the editable phase signal generator is connected with the phase synchronizer of each single-phase inverter, and the output of the H-bridge output modules of several single-phase inverters. The end connection modes are any one of series connection, parallel connection, star connection, and ring connection.
The reconfigurable single-phase digital variable frequency generator according to claim 1, wherein: the plurality of single-phase inverters are evenly divided into a plurality of groups, and the outputs of the H-bridge output modules of the plurality of single-phase inverters in the plurality of units are outputted. The ends are connected in series, and the output ends of several groups of units are connected in parallel or in a star shape or in a ring shape.
The reconfigurable single-phase digital variable frequency generator according to claim 1, wherein: the plurality of single-phase inverters are evenly divided into a plurality of groups, and the outputs of the H-bridge output modules of the plurality of single-phase inverters in the plurality of units are outputted. The ends are connected in parallel, and the output ends of several groups of units are connected in series or in a star shape or in a ring shape.
The reconfigurable single-phase digital variable frequency generator according to claim 1, wherein: the plurality of single-phase inverters are evenly divided into a plurality of groups, and the outputs of the H-bridge output modules of the plurality of single-phase inverters in the plurality of units are outputted. The ends are connected in a star shape or in a ring shape, and the output ends of several groups of cells are sequentially connected in parallel.