CN-115207967-B - Three-phase alternating current power supply parallel system based on split-phase energy storage inverter

Abstract

The invention discloses a three-phase alternating current power supply parallel system based on a split-phase energy storage inverter, which relates to the field of split-phase energy storage inverters, and aims to realize the fission of a single-phase alternating current power supply through a first split-phase energy storage inverter and a second split-phase energy storage inverter by connecting a second phase line of a host with a first phase line of the slave, controlling the output of the second phase line in the host to lag behind the output of the first phase line by a first preset degree, controlling the output of the first phase line in the slave to lag behind the output of the first phase line by a first preset degree, so that the time sequence output time of the first phase line in the slave overlaps the time sequence output time of the second phase line in the host, and further enabling the overlapping output of the second phase line in the host and the first phase line in the slave to be equivalent to the second phase output in three-phase current, and controlling the line voltage between the first phase output and the second phase output to be preset volt.

Inventors

• JI DEHAI
• ZHANG XINGDONG

Assignees

• 宁波德业变频技术有限公司

Dates

Publication Date

20260505

Application Date

20220621

Claims (10)

1. 1. A split phase energy storage inverter-based three-phase ac power supply parallel system, comprising: The system comprises a first split-phase energy storage inverter serving as a master machine and a second split-phase energy storage inverter serving as a slave machine, wherein the master machine and the slave machine both comprise a first phase line, a second phase line, a first inversion bridge output module connected with the first phase line and a second inversion bridge output module connected with the second phase line; the power supply is used for inputting direct current power supply to the host and the slave; the controller is used for outputting PWM waves to the host after the power supply is started; The first inversion bridge output module in the host is used for sequentially opening all power modules in the first inversion bridge output module according to the wave of PWM waves output by the controller to the host so as to invert the direct-current power supply into alternating current and output the alternating current through the first phase line; The second inverter bridge output module in the host is used for sequentially opening all power modules in the second inverter bridge output module according to the wave of PWM waves output by the controller to the host so as to invert the direct-current power supply into alternating current, control the output of a second phase line in the host to lag behind the output of a first phase line by a first preset degree, control the line voltage between the first phase line and the second phase line in the host to be preset voltage and send the current time sequence time to the slave; The controller is also used for outputting PWM waves to the slave machine after the slave machine receives the time sequence time; The first inversion bridge output module in the slave machine is used for sequentially opening all power modules in the first inversion bridge output module according to the wave sequence of PWM waves output by the controller to the slave machine so as to invert a direct current power supply into alternating current, and controlling the output of a first phase line in the slave machine to lag behind the output of a first phase line in the host machine by a first preset degree so as to enable the time sequence output time of the first phase line in the slave machine to overlap the time sequence output time of a second phase line in the host machine; The second inverter bridge output module in the slave machine is used for opening each power module in the second inverter bridge output module according to the wave sequence of PWM waves output by the controller to the slave machine so as to invert the direct-current power supply into alternating current, and controlling the output of the second phase line in the slave machine to lag behind the output of the first phase line in the slave machine by a first preset degree, and the line voltage between the first phase line and the second phase line in the slave machine is preset volt.
2. 2. The three-phase alternating current power supply parallel system based on the split-phase energy storage inverter according to claim 1, wherein the controller comprises a first PWM port, a second PWM port, a third PWM port and a fourth PWM port, the first PWM port outputs a first PWM wave, the second PWM port outputs a second PWM wave, the third PWM port outputs a third PWM wave, the fourth PWM port outputs a fourth PWM wave, and the waveforms of the first PWM wave, the second PWM wave, the third PWM wave and the fourth PWM wave are consistent.
3. 3. The system of claim 2, wherein the controller is specifically configured to output the first PWM wave and the second PWM wave to the master through the first PWM port and the second PWM port simultaneously after the power is started, and further configured to output the third PWM wave and the fourth PWM wave to the slave through the third PWM port and the fourth PWM port simultaneously after the slave receives the time sequence time.
4. 4. The system of claim 3, wherein the first inverter bridge output module in the host is specifically configured to turn on each power module in the first inverter bridge output module according to a wave sequence of the first PWM wave output by the first PWM port in the controller to the host, so as to invert the dc power into ac and output the ac through the first phase line; The second inverter bridge output module in the host is specifically configured to turn on each power module in the second inverter bridge output module according to a wave sequence of a second PWM wave output by a second PWM port in the controller to the host, so as to invert the dc power into ac power, control the output of a second phase line in the host to lag behind the output of a first phase line by a first preset degree, control the line voltage between the first phase line and the second phase line in the host to be preset voltage, and send the current time sequence time to the slave; The first inversion bridge output module in the slave machine is specifically configured to turn on each power module in the first inversion bridge output module according to a wave sequence of a third PWM wave output by a third PWM port in the controller to the slave machine, so as to invert the dc power supply into ac power, and control the output of the first phase line in the slave machine to lag behind the output of the first phase line in the host machine by a first preset degree, so that the time sequence output time of the first phase line in the slave machine overlaps the time sequence output time of the second phase line in the host machine; the second inverter bridge output module in the slave machine is specifically configured to turn on each power module in the second inverter bridge output module according to a wave sequence of a fourth PWM wave output by a fourth PWM port in the controller to the slave machine, so as to invert the dc power supply into ac power, and control the output of the second phase line in the slave machine to lag behind the output of the first phase line in the slave machine by a first preset degree, and the line voltage between the first phase line and the second phase line in the slave machine is preset volt.
5. 5. The split phase energy storage inverter-based three-phase alternating current power supply parallel system according to any one of claims 1 to 4, wherein the output of a first phase line in the master is equivalent to a first phase output in three-phase currents, the overlapping output of a second phase line in the master and the first phase line in the slave is equivalent to a second phase output in three-phase currents, the output of the second phase line in the slave is equivalent to a third phase output in three-phase currents, and line voltages between the first phase output and the second phase output and between the second phase output and the third phase output are all preset volts.
6. 6. The split phase energy storage inverter-based three-phase ac power supply parallel system according to claim 1, wherein the first inverter bridge output module comprises a first inverter bridge output circuit, and specifically comprises: The power supply comprises a first power module, a first driver, a second power module, a second driver, a third power module, a third driver, a fourth power module and a fourth driver, wherein the first driver is connected with a first end of the first power module, the second driver is connected with a second end of the second power module, the second driver is connected with a first end of the second power module, the third end of the third power module is connected with a third end of a first inductor and a second end of the fourth power module, the second end of the third power module is connected with a second end of the second power module, the third end of the second power module is connected with a zero line, the third end of the fourth power module is connected with a ground, and the other end of the first inductor is connected with a first phase line to output.
7. 7. The split phase energy storage inverter-based three-phase ac power supply parallel system according to claim 1, wherein the second inverter bridge output module comprises a second inverter bridge output circuit, which specifically comprises: the power supply comprises a fifth power module, a fifth driver, a sixth power module, a sixth driver, a seventh power module, a seventh driver, an eighth power module and an eighth driver, wherein the fifth driver is connected with a first end of the fifth power module, the sixth power module is connected with a first end of the sixth power module, the seventh driver is connected with a first end of the seventh power module, the seventh power module is connected with a seventh driver, the eighth power module is connected with a first end of the eighth power module, a third end of the seventh power module is connected with a third end of a second inductor and a second end of the eighth power module, the second end of the seventh power module is connected with a second end of the sixth power module, the third end of the sixth power module is connected with a zero line, the third end of the eighth power module is connected with a third end of the eighth power module, and the other end of the second inductor is connected with a second phase line for output.
8. 8. The split phase energy storage inverter based three-phase ac power supply parallel system of claim 5, wherein said first predetermined degree is 120 degrees.
9. 9. The split-phase energy storage inverter-based three-phase alternating current power supply parallel system according to claim 1, wherein the current time sequence time is sent to the slave machine in a CAN communication mode in the second inverter bridge output module of the master machine.
10. 10. The three-phase alternating current power supply parallel system based on the split phase energy storage inverter according to claim 1, wherein the direct current power supply is inverted into alternating current, the alternating current is 120-volt pure sinusoidal alternating current, and the power supply is a 48-volt battery pack.

Description

Three-phase alternating current power supply parallel system based on split-phase energy storage inverter Technical Field The invention relates to the field of split-phase energy storage inverters, in particular to a three-phase alternating current power supply parallel system based on the split-phase energy storage inverter. Background In order to simultaneously meet the requirements of electric appliances of alternating current power supplies (single-phase or three-phase alternating current power supplies) with different phases, and maximize the economic benefit of users, the invention provides a three-phase alternating current power supply parallel system based on a split-phase energy storage inverter. Disclosure of Invention In order to split a single-phase alternating current power supply into three-phase alternating current so as to meet different electrical appliance requirements, the invention provides a three-phase alternating current power supply parallel system based on a split-phase energy storage inverter, which comprises: The system comprises a first split-phase energy storage inverter serving as a master machine and a second split-phase energy storage inverter serving as a slave machine, wherein the master machine and the slave machine both comprise a first phase line, a second phase line, a first inversion bridge output module connected with the first phase line and a second inversion bridge output module connected with the second phase line; the power supply is used for inputting direct current power supply to the host and the slave; the controller is used for outputting PWM waves to the host after the power supply is started; The first inversion bridge output module in the host is used for sequentially opening all power modules in the first inversion bridge output module according to the wave of PWM waves output by the controller to the host so as to invert the direct-current power supply into alternating current and output the alternating current through the first phase line; The second inverter bridge output module in the host is used for sequentially opening all power modules in the second inverter bridge output module according to the wave of PWM waves output by the controller to the host so as to invert the direct-current power supply into alternating current, control the output of a second phase line in the host to lag behind the output of a first phase line by a first preset degree, control the line voltage between the first phase line and the second phase line to be preset voltage and send the current time sequence time to the slave; The controller is also used for outputting PWM waves to the slave machine after the slave machine receives the time sequence time; The first inversion bridge output module in the slave machine is used for sequentially opening all power modules in the first inversion bridge output module according to the wave sequence of PWM waves output by the controller to the slave machine so as to invert a direct current power supply into alternating current, and controlling the output of a first phase line in the slave machine to lag behind the output of a first phase line in the host machine by a first preset degree so as to enable the time sequence output time of the first phase line in the slave machine to overlap the time sequence output time of a second phase line in the host machine; The second inverter bridge output module in the slave machine is used for opening each power module in the second inverter bridge output module according to the wave sequence of PWM waves output by the controller to the slave machine so as to invert the direct-current power supply into alternating current and control the output of the second phase line in the slave machine to lag behind the output of the first phase line in the slave machine by a first preset degree and the line voltage between the first phase line and the second phase line to be preset volt. Further, the controller comprises a first PWM port, a second PWM port, a third PWM port and a fourth PWM port, wherein the first PWM port outputs a first PWM wave, the second PWM port outputs a second PWM wave, the third PWM port outputs a third PWM wave, the fourth PWM port outputs a fourth PWM wave, and the waveforms of the first PWM wave, the second PWM wave, the third PWM wave and the fourth PWM wave are consistent. The controller is specifically configured to output a first PWM wave and a second PWM wave to the host computer through the first PWM port and the second PWM port at the same time after the power supply is started, and further configured to output a third PWM wave and a fourth PWM wave to the slave computer through the third PWM port and the fourth PWM port at the same time after the slave computer receives the time sequence time. Further, the first inverter bridge output module in the host is specifically configured to sequentially turn on each power module in the first inverter bridge output module accordin