A three-phase AC power supply parallel system based on split-phase energy storage inverter

Abstract

This invention discloses a three-phase AC power parallel system based on a split-phase energy storage inverter, relating to the field of split-phase energy storage inverters. It connects the second phase line of the main unit to the first phase line of the slave unit, controls the output of the second phase line in the main unit to lag behind the output of the first phase line by a first preset degree, and controls the output of the first phase line in the slave unit to lag behind the output of the first phase line in the main unit by the same preset degree. This causes the timing output time of the first phase line in the slave unit to overlap with the timing output time of the second phase line in the main unit, thereby making the overlapping output of the second phase line in the main unit and the first phase line in the slave unit equivalent to the second phase output in a three-phase current. Furthermore, the line voltages between the first and second phase outputs, and between the second and third phase outputs, are controlled to be preset volts. Through a first and a second split-phase energy storage inverter, it achieves the splitting of a single-phase AC power supply, meeting the needs of different electrical appliances.

Description

Technical Field

[0001] This invention relates to the field of split-phase energy storage inverters, and more particularly to a three-phase AC power supply parallel system based on a split-phase energy storage inverter. Background Technology

[0002] With the rapid development of photovoltaic energy storage inverters, the diverse power grids have placed more flexible demands on the use of inverters. In order to simultaneously meet the needs of electrical appliances with different numbers of AC power supplies (single-phase or three-phase AC power supplies) and maximize the economic benefits of users, this invention proposes a three-phase AC power parallel system based on split-phase energy storage inverters. Summary of the Invention

[0003] To convert single-phase AC power into three-phase AC power to meet the needs of different electrical appliances, this invention proposes a three-phase AC power parallel system based on a phase-splitting energy storage inverter, comprising:

[0004] The first split-phase energy storage inverter, serving as the master unit, and the second split-phase energy storage inverter, serving as the slave unit, each include a first phase line, a second phase line, a first inverter bridge output module connected to the first phase line, and a second inverter bridge output module connected to the second phase line; the second phase line of the master unit is connected to the first phase line of the slave unit.

[0005] The power supply is used to input DC power to the host and slave devices.

[0006] The controller is used to output a PWM wave to the host after the power is turned on;

[0007] The first inverter bridge output module in the host is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to invert the DC power supply into AC power and output it through the first phase line.

[0008] The second inverter bridge output module in the host is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to convert DC power into AC power, and control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, the line voltage between the first phase line and the second phase line to a preset volt, and send the current timing time to the slave.

[0009] The controller is also configured to output a PWM wave to the slave device after receiving the timing information.

[0010] The first inverter bridge output module in the slave device is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to convert DC power into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device.

[0011] The second inverter bridge output module in the slave device is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to invert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line is a preset volt.

[0012] Furthermore, the controller includes 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, and the fourth PWM port outputs a fourth PWM wave. The waveforms of the first PWM wave, the second PWM wave, the third PWM wave, and the fourth PWM wave are consistent.

[0013] Furthermore, the controller is specifically used to simultaneously output a first PWM wave and a second PWM wave to the host through the first PWM port and the second PWM port after the power is turned on; it is also used to simultaneously output a third PWM wave and a fourth PWM wave to the slave through the third PWM port and the fourth PWM port after the slave receives the timing time.

[0014] Furthermore, the first inverter bridge output module in the host is specifically used to turn on each power module in the first inverter bridge output module according to the wave sequence of the first PWM wave output to the host from the first PWM port in the controller, so as to invert the DC power supply into AC power and output it through the first phase line;

[0015] The second inverter bridge output module in the host is specifically used to open each power module in the second inverter bridge output module according to the wave sequence of the second PWM wave output from the second PWM port in the controller to the host, so as to invert DC power into AC power, and control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, the line voltage between the first phase line and the second phase line to a preset volt, and send the current timing time to the slave.

[0016] The first inverter bridge output module in the slave device is specifically used to turn on each power module in the first inverter bridge output module according to the waveform sequence of the third PWM wave output to the slave device from the third PWM port in the controller, so as to invert the DC power supply into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device.

[0017] The second inverter bridge output module in the slave device is specifically used to turn on each power module in the second inverter bridge output module according to the wave sequence of the fourth PWM wave output from the fourth PWM port in the controller to the slave device, so as to invert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line is a preset volt.

[0018] Furthermore, the output of the first phase line in the host is equivalent to the first phase output of the three-phase current; the overlapping output of the second phase line in the host and the first phase line in the slave is equivalent to the second phase output of the three-phase current; the output of the second phase line in the slave is equivalent to the third phase output of the three-phase current; the line voltage 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.

[0019] Furthermore, the first inverter bridge output module includes a first inverter bridge output circuit, which specifically includes:

[0020] A first power module and a first driver connected to its first end; a second power module and a second driver connected to its first end; a third power module and a third driver connected to its first end; a fourth power module and a fourth driver connected to its first end; wherein, the second end of the first power module is connected to a power supply, and the third end is simultaneously connected to the third end of the third power module, one end of the first inductor, and the second end of the fourth power module; the second end of the third power module is connected to the second end of the second power module; the third end of the second power module is connected to the neutral line; the third end of the fourth power module is grounded; the other end of the first inductor is connected to the first phase line for output.

[0021] Furthermore, the second inverter bridge output module includes a second inverter bridge output circuit, which specifically includes:

[0022] A fifth power module and a fifth driver connected to its first end; a sixth power module and a sixth driver connected to its first end; a seventh power module and a seventh driver connected to its first end; an eighth power module and an eighth driver connected to its first end; wherein, the second end of the fifth power module is connected to a power supply, and its third end is simultaneously connected to the third end of the seventh power module, one end of the second inductor, and the second end of the eighth power module; the second end of the seventh power module is connected to the second end of the sixth power module; the third end of the sixth power module is connected to the neutral line; the third end of the eighth power module is grounded; the other end of the second inductor is connected to the second phase line for output.

[0023] Furthermore, the first preset degree is 120 degrees.

[0024] Furthermore, in the second inverter bridge output module of the host, the current timing time is sent to the slave device via CAN communication.

[0025] Furthermore, the DC power supply is inverted to AC power, specifically 120 volts pure sinusoidal AC power; the power source is a 48 volt battery pack.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] (1) This invention connects the second phase line of the host to the first phase line of the slave, and uses the PWM wave output by the controller to control 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 through the output module of the second inverter bridge in the host, and uses the PWM wave output by the controller to control the output of the first phase line in the slave to lag behind the output of the first phase line in the host by a first preset degree through the output module of the first inverter bridge in the slave, so that the timing output time of the first phase line in the slave overlaps with the timing output time of the second phase line in the host, thereby achieving the overlap between the second phase line in the host and the first phase line in the slave. The stacked output is equivalent to the second phase output in a three-phase current. The output of the first phase line in the host is equivalent to the first phase output in a three-phase current, and the output of the second phase line in the slave is equivalent to the third phase output in a three-phase current. The line voltages between the first phase output and the second phase output, as well as between the second phase output and the third phase output, are all preset volts. Through the first phase splitting energy storage inverter as the host and the second phase splitting energy storage inverter as the slave, the splitting of single-phase AC power (i.e., AC power obtained by inverting DC power) is realized to obtain three-phase AC power, which meets the needs of different electrical appliances.

[0028] (2) The three-phase AC power parallel system proposed in this invention converts the DC power input to the host and slave into three-phase AC power, which greatly improves the flexibility and controllability of power use. Attached Figure Description

[0029] Figure 1 Wiring diagram of the first split-phase energy storage inverter and the second split-phase energy storage inverter;

[0030] Figure 2 This is the output circuit diagram of the first inverter bridge;

[0031] Figure 3 This is the output circuit diagram of the second inverter bridge;

[0032] Figure 4 This is the phase angle diagram after fission. Detailed Implementation

[0033] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0034] Example 1

[0035] To convert single-phase AC power into three-phase AC power to meet the needs of different electrical appliances, this invention proposes a three-phase AC power parallel system based on a phase-splitting energy storage inverter, comprising:

[0036] A first split-phase energy storage inverter serving as the master and a second split-phase energy storage inverter serving as the slave, each including a first phase line, a second phase line, a first inverter bridge output module connected to one end of the first phase line, and a second inverter bridge output module connected to one end of the second phase line; for example Figure 1 As shown, the other end of the second phase line of the host is connected to the other end of the first phase line of the slave.

[0037] Figure 1 In this diagram, INV A represents the master unit, INV B represents the slave unit, L1 represents the first phase line, L2 represents the second phase line (i.e., the combined phase line of the second phase line L2 in the master unit and the first phase line L1 in the slave unit), L3 represents the third phase line (i.e., the second phase line in the slave unit), N represents the neutral line, and l1, l2, and n are connection ports. The second phase line L2 in the master unit INV A is connected to the first phase line L1 in the slave unit INV B, and the neutral line N in the master unit INV A is connected to the neutral line N in the slave unit INV B before output.

[0038] The power supply is used to input DC power to the host and slave devices.

[0039] The controller is used to output a PWM wave to the host after the power is turned on;

[0040] The first inverter bridge output module in the host is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to invert the DC power supply into AC power and output it through the first phase line.

[0041] The second inverter bridge output module in the host is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to convert DC power into AC power, and control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, the line voltage between the first phase line and the second phase line to a preset volt, and send the current timing time to the slave.

[0042] The controller is also configured to output a PWM wave to the slave device after receiving the timing information.

[0043] The first inverter bridge output module in the slave device is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to convert DC power into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device.

[0044] The second inverter bridge output module in the slave device is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to invert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line is a preset volt.

[0045] The controller includes 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, and the fourth PWM port outputs a fourth PWM wave. The waveforms of the first PWM wave, the second PWM wave, the third PWM wave, and the fourth PWM wave are consistent.

[0046] The waveforms of the PWM waves output by the first PWM port, the second PWM port, the third PWM port and the fourth PWM port are controllable. In this embodiment, the waveform of the PWM wave is set to the PWM wave waveform corresponding to the output line voltage of 208Vac.

[0047] The controller is specifically used to simultaneously output a first PWM wave and a second PWM wave to the host through the first PWM port and the second PWM port after the power is turned on; it is also used to simultaneously output a third PWM wave and a fourth PWM wave to the slave through the third PWM port and the fourth PWM port after the slave receives the timing time.

[0048] The first inverter bridge output module in the host is specifically used to turn on each power module in the first inverter bridge output module according to the wave sequence of the first PWM wave output to the host from the first PWM port in the controller, so as to invert the DC power supply into AC power and output it through the first phase line.

[0049] The second inverter bridge output module in the host is specifically used to open each power module in the second inverter bridge output module according to the wave sequence of the second PWM wave output from the second PWM port in the controller to the host, so as to invert DC power into AC power, and control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, the line voltage between the first phase line and the second phase line to a preset volt, and send the current timing time to the slave.

[0050] The first inverter bridge output module in the slave device is specifically used to turn on each power module in the first inverter bridge output module according to the waveform sequence of the third PWM wave output to the slave device from the third PWM port in the controller, so as to invert the DC power supply into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device.

[0051] The second inverter bridge output module in the slave device is specifically used to turn on each power module in the second inverter bridge output module according to the wave sequence of the fourth PWM wave output from the fourth PWM port in the controller to the slave device, so as to invert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line is a preset volt.

[0052] like Figure 4 As shown, the output of the first phase line in the host is equivalent to the first phase output L1 in the three-phase current; the overlapping output of the second phase line in the host and the first phase line in the slave is equivalent to the second phase output L2 in the three-phase current; the output of the second phase line in the slave is equivalent to the third phase output L3 in the three-phase current; the line voltage 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.

[0053] like Figure 2 As shown, the first inverter bridge output module includes a first inverter bridge output circuit, which specifically includes:

[0054] The system comprises: a first power module QR1 and a first driver G-QA1 connected to its first terminal; a second power module QR2 and a second driver G-QA2 connected to its first terminal; a third power module QR3 and a third driver G-QA3 connected to its first terminal; and a fourth power module QR4 and a fourth driver G-QA4 connected to its first terminal. The second terminal of the first power module QR1 is connected to a power supply HV-HV, and its third terminal is simultaneously connected to the third terminal of the third power module QR3, one end of the first inductor L1, and the second terminal of the fourth power module QR4. The second terminal of the third power module QR3 is connected to the second terminal of the second power module QR2. The third terminal of the second power module QR2 is connected to the neutral line BUS_N. The third terminal of the fourth power module QR4 is grounded H_GED. The other end of the first inductor L1 is connected to the first phase line for output.

[0055] like Figure 3 As shown, the second inverter bridge output module includes a second inverter bridge output circuit, which specifically includes:

[0056] The fifth power module QR5 and the fifth driver G-QA5 connected to its first terminal; the sixth power module QR6 and the sixth driver G-QA6 connected to its first terminal; the seventh power module QR7 and the seventh driver G-QA7 connected to its first terminal; the eighth power module QR8 and the eighth driver G-QA8 connected to its first terminal; wherein, the second terminal of the fifth power module QR5 is connected to the power supply HV-HV, and the third terminal is simultaneously connected to the third terminal of the seventh power module QR7, one end of the second inductor L2, and the second terminal of the eighth power module QR8; the second terminal of the seventh power module QR7 is connected to the second terminal of the sixth power module QR6; the third terminal of the sixth power module QR6 is connected to the neutral line BUS_N; the third terminal of the eighth power module QR8 is grounded H_GED; the other end of the second inductor L2 is connected to the second phase line for output.

[0057] The first preset degree is 120 degrees.

[0058] The three-phase AC power parallel system proposed in this embodiment converts the DC power input to the host and slave into three-phase AC power with a phase voltage of 120Vac and a line voltage of 208Vac, which greatly improves the flexibility and controllability of power use.

[0059] It should be noted that the three-phase AC power supply parallel system also includes:

[0060] The power grid type setting interface is used to select the power grid type corresponding to the DC power supply. The power grid types include: 1. Three-phase AC power with a phase voltage of 120Vac and a line voltage of 208Vac; 2. Split-phase AC power with a phase voltage of 120Vac and a line voltage of 240Vac. After selecting the power grid type, the line voltage can be adjusted by the PWM waves output from the first, second, third, and fourth PWM ports in the controller corresponding to the power grid type (in this embodiment, different power grid types have corresponding preset waveform PWM waves). By selecting the corresponding power grid type according to the power demand of the electrical appliances, the flexibility of power use is further improved.

[0061] A digital oscilloscope is used to display the various PWM waves output by the controller.

[0062] In the second inverter bridge output module of the host, the current timing time is sent to the slave via CAN communication.

[0063] The process of converting DC power to AC power specifically refers to 120Vac pure sinusoidal AC power; the power source is a 48V battery pack.

[0064] This invention connects the second phase line of the master unit to the first phase line of the slave unit. The second inverter bridge output module in the master unit uses a PWM wave output from the controller to control the output of the second phase line in the master unit to lag behind the output of the first phase line by a first preset degree. Similarly, the first inverter bridge output module in the slave unit uses a PWM wave output from the controller to control the output of the first phase line in the slave unit to lag behind the output of the first phase line in the master unit by the same preset degree. This causes the timing output time of the first phase line in the slave unit to overlap with the timing output time of the second phase line in the master unit, thereby achieving overlap between the second phase line in the master unit and the first phase line in the slave unit. The output is equivalent to the second phase output of a three-phase current. The output of the first phase line in the host is equivalent to the first phase output of a three-phase current, and the output of the second phase line in the slave is equivalent to the third phase output of a three-phase current. The line voltages between the first and second phase outputs, and between the second and third phase outputs, are all preset volts. Through the first phase splitting energy storage inverter as the host and the second phase splitting energy storage inverter as the slave, the splitting of single-phase AC power (i.e., AC power obtained by inverting DC power) is realized to obtain three-phase AC power, which meets the needs of different electrical appliances.

[0065] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0066] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A three-phase AC power supply parallel system based on a split-phase energy storage inverter, characterized in that, include: The first split-phase energy storage inverter, serving as the master unit, and the second split-phase energy storage inverter, serving as the slave unit, each include a first phase line, a second phase line, a first inverter bridge output module connected to the first phase line, and a second inverter bridge output module connected to the second phase line; the second phase line of the master unit is connected to the first phase line of the slave unit. The power supply is used to input DC power to the host and slave devices. The controller is used to output a PWM wave to the host after the power is turned on; The first inverter bridge output module in the host is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to invert the DC power supply into AC power and output it through the first phase line. The second inverter bridge output module in the host is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the host, so as to convert DC power into AC power, and control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, the line voltage between the first phase line and the second phase line in the host to be a preset volt, and send the current timing time to the slave. The controller is also configured to output a PWM wave to the slave device after receiving the timing information. The first inverter bridge output module in the slave device is used to turn on each power module in the first inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to convert DC power into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device. The second inverter bridge output module in the slave device is used to turn on each power module in the second inverter bridge output module according to the wave sequence of the PWM wave output by the controller to the slave device, so as to convert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line in the slave device is a preset volt.

2. The three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 1, characterized in that, The controller includes 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, and the fourth PWM port outputs a fourth PWM wave. The waveforms of the first PWM wave, the second PWM wave, the third PWM wave, and the fourth PWM wave are consistent.

3. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 2, characterized in that, The controller is specifically used to simultaneously output a first PWM wave and a second PWM wave to the host through the first PWM port and the second PWM port after the power is turned on; it is also used to simultaneously output a third PWM wave and a fourth PWM wave to the slave through the third PWM port and the fourth PWM port after the slave receives the timing time.

4. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 3, characterized in that, The first inverter bridge output module in the host is specifically used to turn on each power module in the first inverter bridge output module according to the wave sequence of the first PWM wave output to the host from the first PWM port in the controller, so as to invert the DC power supply into AC power and output it through the first phase line. The second inverter bridge output module in the host is specifically used to turn on each power module in the second inverter bridge output module according to the wave sequence of the second PWM wave output from the second PWM port in the controller to the host, so as to invert DC power into AC power, control the output of the second phase line in the host to lag the output of the first phase line by a first preset degree, set the line voltage between the first phase line and the second phase line in the host to a preset volt, and send the current timing time to the slave. The first inverter bridge output module in the slave device is specifically used to turn on each power module in the first inverter bridge output module according to the waveform sequence of the third PWM wave output to the slave device from the third PWM port in the controller, so as to invert the DC power supply into AC power, and control the output of the first phase line in the slave device to lag behind the output of the first phase line in the master device by a first preset degree, so that the timing output time of the first phase line in the slave device overlaps with the timing output time of the second phase line in the master device. The second inverter bridge output module in the slave device is specifically used to turn on each power module in the second inverter bridge output module according to the wave sequence of the fourth PWM wave output from the fourth PWM port in the controller to the slave device, so as to invert the DC power supply into AC power, and control the output of the second phase line in the slave device to lag behind the output of the first phase line in the slave device by a first preset degree, and the line voltage between the first phase line and the second phase line in the slave device is a preset volt.

5. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to any one of claims 1 to 4, characterized in that, The output of the first phase line in the host is equivalent to the first phase output of the three-phase current; the overlapping output of the second phase line in the host and the first phase line in the slave is equivalent to the second phase output of the three-phase current; the output of the second phase line in the slave is equivalent to the third phase output of the three-phase current; the line voltage 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. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 1, characterized in that, The first inverter bridge output module includes a first inverter bridge output circuit, which specifically includes: A first power module and a first driver connected to its first end; a second power module and a second driver connected to its first end; a third power module and a third driver connected to its first end; a fourth power module and a fourth driver connected to its first end; wherein, the second end of the first power module is connected to a power supply, and the third end is simultaneously connected to the third end of the third power module, one end of the first inductor, and the second end of the fourth power module; the second end of the third power module is connected to the second end of the second power module; the third end of the second power module is connected to the neutral line; the third end of the fourth power module is grounded; the other end of the first inductor is connected to the first phase line for output.

7. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 1, characterized in that, The second inverter bridge output module includes a second inverter bridge output circuit, which specifically includes: A fifth power module and a fifth driver connected to its first end; a sixth power module and a sixth driver connected to its first end; a seventh power module and a seventh driver connected to its first end; an eighth power module and an eighth driver connected to its first end; wherein, the second end of the fifth power module is connected to a power supply, and its third end is simultaneously connected to the third end of the seventh power module, one end of the second inductor, and the second end of the eighth power module; the second end of the seventh power module is connected to the second end of the sixth power module; the third end of the sixth power module is connected to the neutral line; the third end of the eighth power module is grounded; the other end of the second inductor is connected to the second phase line for output.

8. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 5, characterized in that, The first preset degree is 120 degrees.

9. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 1, characterized in that, In the second inverter bridge output module of the host, the current timing time is sent to the slave via CAN communication.

10. A three-phase AC power supply parallel system based on a split-phase energy storage inverter according to claim 1, characterized in that, The process of converting DC power to AC power specifically involves using 120-volt pure sinusoidal AC power, with the power source being a 48-volt battery pack.

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