CN117134638A - Upgrade method, inverter, parallel operation system and readable storage medium - Google Patents
Upgrade method, inverter, parallel operation system and readable storage medium Download PDFInfo
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- CN117134638A CN117134638A CN202311405334.2A CN202311405334A CN117134638A CN 117134638 A CN117134638 A CN 117134638A CN 202311405334 A CN202311405334 A CN 202311405334A CN 117134638 A CN117134638 A CN 117134638A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The application discloses an upgrading method, an inverter, a parallel operation system and a readable storage medium, and relates to the technical field of inverters. The upgrade method is applied to the first inverter. The first inverter comprises a first voltage conversion module and a first switch, and the first voltage conversion module and the first load are connected with a power grid through the first switch. The upgrading method comprises the following steps: judging whether an upgrade instruction is received or not; if an upgrade instruction is received, recording the current first state of the first switch, and executing an upgrade mode based on the upgrade instruction; the first state is read, and the first switch is controlled to be closed when the first state is the closed state. By the mode, the load can be kept uninterrupted when the inverter is upgraded.
Description
Technical Field
The present application relates to the technical field of inverters, and in particular, to an upgrade method, an inverter, a parallel operation system, and a readable storage medium.
Background
Currently, an off-grid inverter is typically provided with two ac ports, a grid port and a load port, respectively. The load port is connected with the load so that the parallel-to-off-grid inverter supplies power for the load.
However, when the on-grid and off-grid inverter needs to be upgraded, the connection between the on-grid and off-grid inverter and the load is usually disconnected, and thus the load is powered off.
Disclosure of Invention
The application aims to provide an upgrading method, an inverter, a parallel operation system and a readable storage medium, which can keep a load from being powered off when the inverter is upgraded.
In order to achieve the above object, in a first aspect, the present application provides an upgrade method applied to a first inverter, where the first inverter includes a first voltage conversion module and a first switch, and the first voltage conversion module and a first load are both connected to a power grid through the first switch, the upgrade method includes:
judging whether an upgrade instruction is received or not;
if the upgrade instruction is received, recording the current first state of the first switch, and executing an upgrade mode;
and reading the first state and controlling the first switch to be closed when the first state is a closed state.
In an alternative manner, the first inverter further includes a second switch, and the first voltage conversion module is connected to the first load through the second switch;
before the recording of the current first state of the first switch, the upgrading method further comprises:
and controlling the second switch to be opened.
In an optional manner, the first inverter is arranged in a parallel operation system, the parallel operation system comprises N inverters which are sequentially connected, and the N inverters comprise the first inverter, wherein N is an integer more than or equal to 2;
after the reading the first state and controlling the first switch to be closed when the first state is a closed state, the upgrading method further comprises:
acquiring the current working state of the parallel operation system, wherein the current working state of the parallel operation system comprises an off-grid output state and a non-off-grid output state, and the off-grid output state is that the connection between the N inverters and the power grid is disconnected and is in an output state;
and controlling the first switch based on the current working state of the parallel operation system.
In an alternative manner, the N inverters further include a second inverter connected to a second load;
the controlling the first switch based on the current working state of the parallel operation system includes:
when the current working state of the parallel operation system is the off-grid output state and the first load is connected with the second load, the first switch is controlled to be disconnected;
and when the current working state of the parallel operation system is the off-grid output state and the first load is not connected with the second load, or when the current working state of the parallel operation system is the non-off-grid output state, controlling the first switch to keep the current state unchanged.
In an alternative manner, the second inverter further comprises a second voltage conversion module and a third switch, the third switch being connected between the second voltage conversion module and the second load;
after said controlling said first switch to open, said upgrade method further comprises:
and if the first state is a closed state, outputting a control signal to the second inverter so that the second inverter controls the third switch to be closed.
In an optional manner, before the current working state of the parallel operation system is obtained, the upgrading method further includes:
collecting the voltage of the power grid port;
if the voltage of the power grid port is in the voltage range allowed to be born by the first load, acquiring the current working state of the parallel operation system;
and if the voltage of the power grid port is not in the voltage range allowed to be born by the first load, controlling the first switch to be disconnected.
In a second aspect, the present application provides an inverter comprising a control module;
the control module includes:
at least one processor and a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform the method as described above.
In a third aspect, the application provides a parallel operation system, comprising N inverters which are sequentially connected, wherein N is an integer more than or equal to 2;
at least one inverter of the N inverters is configured as an inverter as described above.
In an alternative manner, the N inverters include a first inverter including a first voltage conversion module, a first switch, and a second switch;
the first voltage conversion module and the first load are connected with a power grid through the first switch, and the first voltage conversion module is also connected with the first load through the second switch.
In an alternative manner, the N inverters further include a second inverter including a second voltage conversion module, a third switch, and a fourth switch;
the second voltage conversion module and the second load are both connected with the power grid through the third switch, and the second voltage conversion module is also connected with the second load through the fourth switch.
In an alternative manner, the N inverters further include a third inverter, the third inverter including a third voltage conversion module, a fifth switch, and a sixth switch;
the third voltage conversion module and the third load are connected with the power grid through the fifth switch, and the third voltage conversion module is also connected with the third load and the first load through the sixth switch respectively.
In a fourth aspect, the present application provides a non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by a processor, cause the processor to perform a method as described above.
The beneficial effects of the application are as follows: the upgrading method provided by the application is applied to the first inverter. The first inverter comprises a first voltage conversion module and a first switch, and the first voltage conversion module and the first load are connected with a power grid through the first switch. The upgrading method comprises the following steps: judging whether an upgrade instruction is received or not; if an upgrade instruction is received, recording the current first state of the first switch, and executing an upgrade mode based on the upgrade instruction; the first state is read, and the first switch is controlled to be closed when the first state is the closed state. By the mode, the first switch can be controlled to be closed when the inverter is upgraded, so that the power grid supplies power for the load through the first switch, and the load is kept from being powered off.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a parallel operation system according to a first embodiment of the present application;
fig. 2 is a schematic circuit diagram of a first inverter and a second inverter according to a first embodiment of the present application;
fig. 3 is a schematic circuit diagram of a first inverter and a third inverter according to a first embodiment of the present application;
fig. 4 is a schematic structural diagram of a first control module according to a first embodiment of the present application;
FIG. 5 is a flowchart of an upgrade method according to a first embodiment of the present application;
FIG. 6 is a schematic diagram of a step 503 shown in FIG. 5 according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an implementation of step 602 shown in FIG. 6 according to an embodiment of the present application;
FIG. 8 is a schematic diagram showing steps of a method according to an embodiment of the present application after the step 701 shown in FIG. 7 is performed;
FIG. 9 is a schematic diagram showing steps of a method according to an embodiment of the present application after performing step 601 shown in FIG. 6;
fig. 10 is a flowchart of an upgrade method according to a second embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a parallel operation system according to an embodiment of the present application. As shown in fig. 1, the parallel operation system 100 includes N inverters connected in sequence. Wherein N is an integer not less than 2.
The N inverters include a first inverter A1, a second inverter A2 …, and AN nth inverter AN. At least one inverter of the first inverter A1, the second inverter A2 …, the nth inverter AN is capable of performing the upgrade method provided by any of the embodiments of the present application. For example, the first inverter A1 can perform the upgrade method provided by any of the embodiments of the present application. As another example, the first inverter A1 and the second inverter A2 …, the nth inverter AN can execute the upgrade method provided by any embodiment of the present application.
The first inverter A1 and the second inverter A2 …, and the nth inverter AN are connected to the power grid 200. The first inverter A1 is also connected with the first load B1 to supply power to the first load B1; the second inverter A2 is also connected to the second load B2 to supply power to the second load B2 … the nth inverter AN is also connected to the nth load BN to supply power to the nth load BN.
Referring to fig. 2, a circuit structure of the first inverter A1 and the second inverter A2 is illustrated in fig. 2.
In an embodiment, as shown in fig. 2, the first inverter A1 includes a first control module a1_1, a first voltage conversion module a1_2, a first switch a1_3 and a second switch a1_4.
The first voltage conversion module a1_2 and the first load B1 are both connected to the power grid 200 through the first switch a1_3. The first voltage conversion module a1_2 is also connected to the first load B1 through the second switch a1_4. Specifically, two output ends of the first voltage conversion module a1_2 are respectively connected with two ports of the second switch a1_4, the other two ports of the second switch a1_4 are respectively connected with two ports of the first switch a1_3 and two ports of the first load B1, and the other two ports of the first switch a1_3 are connected with the power grid 200. The first control module a1_1 is used for controlling the opening and closing of the first switch a1_3, and of course, the first control module a1_1 can also be used for controlling the opening and closing of the second switch a1_4.
Specifically, when the first switch a1_3 is closed and the second switch a1_4 is open, the power grid 200 supplies power to the first load B1 through the first switch a1_3; when the second switch a1_4 is closed and the first switch a1_3 is opened, the first voltage conversion module a1_2 supplies power to the first load B1 through the second switch a1_4.
In some embodiments, the first voltage conversion module a1_2 may be a module for converting direct current power to alternating current power, i.e., a DC-AC module.
In an embodiment, the second inverter A2 includes a second control module a2_1, a second voltage conversion module a2_2, a third switch a2_3 and a fourth switch a2_4.
The second voltage conversion module a2_2 and the second load B2 are both connected to the power grid 200 through the third switch a2_3. The second voltage conversion module a2_2 is also connected to the second load B2 through the fourth switch a2_4. Specifically, two output ends of the second voltage conversion module a2_2 are respectively connected with two ports of the fourth switch a2_4, the other two ports of the fourth switch a2_4 are respectively connected with two ports of the third switch a2_3 and two ports of the second load B2, and the other two ports of the third switch a2_3 are connected with the power grid 200. The second control module a2_1 is used for controlling the opening and closing of the third switch a2_3, and of course, the second control module a2_1 can also be used for controlling the opening and closing of the fourth switch a2_4. And, the second control module a2_1 is in communication connection with the first control module a1_1 so as to realize data transmission between the second control module a2_1 and the first control module a1_1.
Specifically, when the third switch a2_3 is closed and the fourth switch a2_4 is open, the power grid 200 supplies power to the second load B2 through the third switch a2_3; when the fourth switch a2_4 is closed and the third switch a2_3 is opened, the second voltage conversion module a2_2 supplies power to the second load B2 through the fourth switch a2_4.
In some embodiments, the second voltage conversion module a2_2 may be a module for converting direct current power to alternating current power, i.e., a DC-AC module.
In the embodiment shown in fig. 2, since there is no electrical connection between the first load B1 and the second load B2, the first switch a1_3 may be closed or opened without affecting the second load B2, and likewise, the third switch a2_3 may be closed or opened without affecting the first load B1.
Referring to fig. 3, fig. 3 schematically illustrates a circuit structure of the first inverter A1 and the third inverter A3.
The circuit structure of the first inverter A1 shown in fig. 3 is the same as that of fig. 2, and specific reference may be made to the detailed description of fig. 2, which is not repeated here. The difference is the third inverter A3 and the connection between the first inverter A1 and the third inverter A3.
In an embodiment, as shown in fig. 3, the third inverter A3 includes a third control module a3_1, a third voltage conversion module a3_2, a fifth switch a3_3 and a sixth switch a3_4.
The third voltage conversion module a3_2 and the third load B3 are both connected to the power grid 200 through a fifth switch a3_3. The third voltage conversion module a3_2 is further connected to a third load B3 via a sixth switch a3_4. Specifically, two output ends of the third voltage conversion module a3_2 are respectively connected with two ports of the sixth switch a3_4, the other two ports of the sixth switch a3_4 are respectively connected with two ports of the fifth switch a3_3, two ports of the third load B3 and two ports of the first load B1, and the other two ports of the fifth switch a3_3 are connected with the power grid 200. Meanwhile, the third control module a3_1 of the first load B1 and the third load B3 is used for controlling the opening and closing of the fifth switch a3_3, and of course, the third control module a3_1 can also be used for controlling the opening and closing of the fourth switch a2_4. And, the third control module a3_1 is in communication connection with the first control module a1_1 so as to realize data transmission between the third control module a3_1 and the first control module a1_1.
Specifically, when the fifth switch a3_3 is closed and the sixth switch a3_4 is open, the power grid 200 supplies power to the third load B3 through the third switch a2_3; when the sixth switch a3_4 is closed and the fifth switch a3_3 is opened, the third voltage conversion module a3_2 supplies power to the second load B2 through the fourth switch a2_4.
In some embodiments, the third voltage conversion module a3_2 may be a module for converting direct current power to alternating current power, i.e., a DC-AC module.
In the embodiment shown in fig. 3, since there is an electrical connection between the first load B1 and the third load B3, when the first switch a1_3 is closed, if the sixth switch a3_4 is also closed and the third inverter A3 is in the output state, the output of the third inverter A3 will be caused to be directly connected to the grid 200. Since both the voltage and the phase are not synchronized, the third inverter A3 is likely to be damaged. Likewise, the fifth switch a3_3 may cause the first inverter A1 to be damaged when it is closed. Thus, in this embodiment, when N inverters in the parallel operation system are in output states, the switches (such as the first switch a1_3 and the fifth switch a3_3) connected to the power grid 200 should be kept off, so as to prevent the N inverters from being directly connected to the power grid 200 and being damaged, which is beneficial to prolonging the service lives of the N inverters.
Referring to fig. 4, fig. 4 illustrates one configuration of the first control module a1_1.
As shown in fig. 4, the first control module a1_1 includes at least one processor a1_11 and a memory a1_12, where the memory a1_12 may be internal to the first control module a1_1, or external to the first control module a1_1, and the memory a1_12 may also be a remotely located memory, and connected to the first control module a1_1 through a network.
The memory a1_12 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The memory a1_12 may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, the memory a1_12 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory a1_12 optionally includes memory remotely located relative to the processor a1_11, which may be connected to the terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The processor a1_11 performs various functions and processes of the terminal by running or executing software programs and/or modules stored in the memory a1_12 and calling data stored in the memory a1_12, thereby performing overall monitoring of the terminal, for example, implementing the upgrade method according to any of the embodiments of the present application.
The number of processors a1_11 may be one or more, and one processor a1_11 is exemplified in fig. 4. The processor a1_11 and the memory a1_12 may be connected by a bus or other means. The processor a1_11 may include a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a controller, a Field Programmable Gate Array (FPGA) device, and the like. The processor a1_11 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
Embodiments of the present application also provide a non-volatile computer-readable storage medium storing computer-executable instructions that, when executed by an inverter, cause the inverter to perform the upgrade method of any of the embodiments above.
Embodiments of the present application also provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the upgrade method as in any of the embodiments above.
Referring to fig. 5, fig. 5 is a flowchart of an upgrade method according to an embodiment of the present application. The upgrading method is applied to the first inverter. The first inverter comprises a first voltage conversion module and a first switch, and the first voltage conversion module and the first load are connected with the power grid through the first switch. In some embodiments, the first inverter may be implemented by a structure as shown in fig. 1 to 4, and specific implementation processes are described in detail in the foregoing embodiments, which are not repeated herein.
As shown in fig. 5, the upgrade method includes the steps of:
step 501: and judging whether an upgrade instruction is received.
Step 502: if an upgrade instruction is received, recording the current first state of the first switch, and executing an upgrade mode.
Step 503: the first state is read, and the first switch is controlled to be closed when the first state is the closed state.
Wherein, the upgrade method is executed by the first control module A1_1 as an example. In the related art, after receiving an upgrade instruction, the first control module a1_1 directly executes an upgrade mode to upgrade functions, and when the upgrade is performed, the control of the first switch a1_3 is stopped, so that the first switch a1_3 is disconnected, the first load B1 is also powered off to stop running, and the user experience is poor.
In the present application, after receiving the upgrade command, the first control module a1_1 records the current state (i.e. the first state) of the first switch a1_3. Then, the first state is read while the upgrade mode is performed (of course, the first switch a1_3 is turned off due to the upgrade mode being entered at this time). If the first state is a closed state, it is determined that the first load B1 is in a state of being powered on and operating normally when receiving the upgrade instruction. In this case, the first control module a1_1 controls the first switch a1_3 to be turned on again according to the recorded first state, so as to supply power to the first load B1 through the power grid 200, thereby restoring the normal operation of the first load B1, that is, realizing the process of keeping the first load B1 uninterrupted when the first control module a1_1 is upgraded, which is beneficial to improving the practicality and the user experience.
In addition, if the recorded first state is the off state, the first switch a1_3 is kept off when the first control module a1_1 is upgraded, so as to prevent the first load B1 from being damaged due to sudden power supply to the first load B1, thereby improving the safety and stability.
In an embodiment, the first inverter further comprises a second switch, and the first voltage conversion module is connected to the first load through the second switch, for example, a second switch a1_4 as shown in fig. 2. The upgrade method further comprises the steps of, before the recording of the current first state of the first switch in step 502 is performed: the second switch is controlled to be turned off.
Specifically, by controlling the second switch a1_4 to be opened, it is possible to prevent the first inverter A1 from being damaged due to the direct connection of the power grid 200 and the first voltage conversion module a1_2 when the first switch a1_3 is closed.
In an embodiment, the first inverter is disposed in a parallel operation system, and the parallel operation system includes N inverters sequentially connected, where the N inverters include the first inverter. In some embodiments, the parallel operation system may be implemented by a structure as shown in fig. 1 to 3, and specific implementation processes have been described in detail in the foregoing embodiments, which are not repeated herein.
As shown in fig. 6, after the first state is read in step 503 and the first switch is controlled to be closed when the first state is a closed state, the upgrade method further includes the following steps:
step 601: and acquiring the current working state of the parallel operation system.
Step 602: and controlling the first switch based on the current working state of the parallel operation system.
The current working state of the parallel operation system comprises an off-network output state and a non-off-network output state.
The off-grid output state is that the connection between the N inverters and the grid is disconnected and in the output state. Taking fig. 2 as an example, the off-grid output state is that the first switch a1_3 and the second switch a1_4 in the first inverter A1 are both disconnected, and the connection between the first inverter A1 and the power grid 200 is disconnected; the third switch a2_3 and the fourth switch a2_4 in the second inverter A2 are both opened, and the connection between the second inverter A2 and the power grid 200 is opened. Meanwhile, the first inverter A1 and the second inverter A2 are both in an output state.
The non-off-grid output state includes that the N inverters are in a standby state or a grid-connected state. The standby state refers to the state that the inverter is inactive or not in use. The grid-connected state refers to a state in which the inverter is connected to the grid and shares power.
Based on the current operating state of the parallel operation system, it can be determined whether the closing and opening of the first switch a1_3 may cause damage to the period in the parallel operation system, so as to feel whether the first switch a1_3 is opened or closed.
In an embodiment, the N inverters further include a second inverter connected to a second load, such as the second inverter A2 shown in fig. 2. Wherein N is an integer not less than 2. Then, as shown in fig. 7, based on the current working state of the parallel operation system, the specific implementation process of controlling the first switch in step 602 may include the following steps:
step 701: when the current working state of the parallel operation system is an off-network output state and the first load is connected with the second load, the first switch is controlled to be disconnected.
Step 702: when the current working state of the parallel operation system is the off-grid output state and the first load is not connected with the second load, or when the current working state of the parallel operation system is the non-off-grid output state, the first switch is controlled to keep the current state unchanged.
Specifically, when the current working state of the parallel operation system is the off-network output state, two connection relations exist between the first load and the second load, and the first switch can be controlled pertinently based on the two relations.
The first connection relationship is shown in fig. 2, and there is no direct connection between the first load B1 and the second load B2. At this time, the first switch a1_3 may be closed or opened without affecting the second load B2, and at the same time, the third switch a2_3 may be closed or opened without affecting the first load B1. Then, the current state of the first switch a1_3 is kept unchanged, that is, if the current state of the first switch a1_3 is closed, the first switch a1_3 is kept closed; if the current state of the first switch a1_3 is off, the first switch a1_3 is kept off.
The second connection is shown in fig. 3, where the first load B1 is directly connected to the third load B3 (here, the second load). At this time, since there is an electrical connection between the first load B1 and the third load B3, when the first switch a1_3 is closed, if the sixth switch a3_4 is also closed and the third inverter A3 is in the output state, the output of the third inverter A3 is directly connected to the grid 200. Since both the voltage and the phase are not synchronized, the third inverter A3 is likely to be damaged. Likewise, the fifth switch a3_3 may cause the first inverter A1 to be damaged when it is closed. Thus, in this embodiment, the first switch a1_3 needs to be controlled to be turned off to prevent the power grid 200 from being damaged by the direct connection between the first switch a1_3 and the third inverter A3, which is beneficial to protect the third inverter A3.
When the current working state of the parallel operation system is a non-off-grid output state, namely the N inverters are in a standby state or a grid-connected state, even if the power grid 200 is directly connected with any one of the N inverters, the damage of the inverters can not be caused. Then, the current state of the first switch a1_3 is kept unchanged.
In an embodiment, the second inverter further includes a second voltage conversion module and a third switch, and the third switch is connected between the second voltage conversion module and the second load. For example, as shown in fig. 2, the second inverter A2 further includes a second voltage conversion module a2_2 and a third switch a2_3, and the third switch a2_3 is connected between the second voltage conversion module a2_2 and the second load B2.
Then, as shown in fig. 8, after performing the step 701 of controlling the first switch to be opened, the upgrade method further includes the following method steps:
step 801: and if the first state is a closed state, outputting a control signal to the second inverter so that the second inverter controls the third switch to be closed.
Take fig. 3 as an example. At this time, the third inverter A2 corresponds to the second inverter in step 801, and the sixth switch a3—3 corresponds to the third switch in step 801. After the first switch a1_3 is controlled to be turned off, the first load B1 is powered down to stop the movement. However, when the state before the first switch a1_3 is updated is closed, the first load B1 is powered and in an operating state. Then, in order to restore the operation of the first load B1, since the first load B1 is directly connected to the third load B3, the first inverter A1 outputs a control signal to the third inverter A3, so that the third inverter A3 closes the sixth switch a3_3, and the third voltage conversion module a3_2 supplies power to the first load B1 through the sixth switch a3_3, thereby maintaining the operation of the first load B1, that is, maintaining the first load B1 uninterrupted when the first inverter A1 is upgraded.
In one embodiment, as shown in fig. 9, before the current working state of the parallel operation system is obtained in step 601, the upgrade method further includes the following steps:
step 901: and collecting the voltage of the power grid port.
Step 902: and if the voltage of the power grid port is in the voltage range allowed to be born by the first load, acquiring the current working state of the parallel operation system.
Step 903: and if the voltage of the power grid port is not in the voltage range allowed to be born by the first load, controlling the first switch to be turned off.
Specifically, the voltage at the grid port is the voltage output by the grid 200. The voltage range that the first load B1 is allowed to bear is denoted by [ Vmin, vmax ], wherein Vmax is the maximum voltage that the first load B1 is allowed to bear, and if the voltage exceeds Vmax, the first load B1 is damaged due to the excessive input voltage; vmin is the minimum voltage that the first load B1 can operate, and if Vmin is smaller than Vmin, the first load B1 cannot operate normally. It can be seen that when the voltage of the power grid 200 is too high (greater than Vmax) or too low (less than Vmin), the power grid 200 cannot directly supply the first load B1, and the first switch a1_3 should be controlled to be turned off to prevent the first load B1 from being damaged. Conversely, if the voltage at the grid port is within the voltage range allowed by the first load, step 601 may be performed continuously.
Referring to fig. 10, fig. 10 is a flowchart of an upgrade method according to another embodiment of the present application. Please refer to fig. 2, fig. 3 and fig. 10. Specifically, the first inverter A1 is exemplified as an upgrade. First, the first control module a1_1 determines whether an upgrade instruction is received. If the first control module a1_1 does not receive the upgrade instruction, no operation is executed. If the first control module a1_1 receives the upgrade instruction, the second switch a1_4 is controlled to be opened to prevent the power grid 200 from being directly connected to the first voltage conversion module a1_2 to damage the first voltage conversion module a1_2 when the first switch a1_3 is closed. Next, the current state (i.e., the first state) of the first switch a1_3 is recorded, and the upgrade mode starts to be performed. Thereafter, the first state is read. If the first state is a closed state, the first switch A1_3 is controlled to be closed so as to supply power to the first load B1 through the power grid 200, thereby keeping the first load B1 uninterrupted; if the first state is off, the first switch a1_3 is controlled to be kept off.
Then, the voltage of the port of the power grid 200 is collected, and whether the voltage of the port of the power grid 200 is in a range which the first load B1 is allowed to bear is judged. If the voltage of the port of the power grid 200 is not in the range which the first load B1 is allowed to bear, the first switch A1_3 is controlled to be disconnected; if the voltage of the port of the power grid 200 is in the range allowed to be born by the first load B1, the current working state of the parallel operation system is obtained. And then judging whether the current working state of the parallel operation system is an off-network output state. If the current working state of the parallel operation system is not the off-network output state, namely the current working state of the parallel operation system is the non-off-network output state, the first switch A1_3 is controlled to keep the current state unchanged; if the current working state of the parallel operation system is the off-network output state, further judging whether the first load B1 and the second load B2 are directly connected. If the first load B1 is not directly connected with the second load B2, the first switch A1_3 is controlled to keep the current state unchanged; if the first load B1 is directly connected to the second load B2, the first switch a1_3 is controlled to be turned off. And, if the first recorded state is closed, in order to keep the first load B1 uninterrupted, the first control module a1_1 outputs a control signal to the second control module a2_1, so that the second control module a2_1 controls the third switch a2_3 to be closed. Then, the second voltage conversion module a2_2 can supply power to the first load B1 through the third switch a2_3 to keep the first load B1 uninterrupted.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (12)
1. An upgrade method, applied to a first inverter, where the first inverter includes a first voltage conversion module and a first switch, and the first voltage conversion module and a first load are both connected to a power grid through the first switch, the upgrade method includes:
judging whether an upgrade instruction is received or not;
if the upgrade instruction is received, recording the current first state of the first switch, and executing an upgrade mode;
and reading the first state and controlling the first switch to be closed when the first state is a closed state.
2. The upgrade method according to claim 1, wherein the first inverter further comprises a second switch, the first voltage conversion module being connected to the first load through the second switch;
before the recording of the current first state of the first switch, the upgrading method further comprises:
and controlling the second switch to be opened.
3. The upgrading method according to claim 1 or 2, wherein the first inverter is arranged in a parallel operation system, the parallel operation system comprises N inverters which are sequentially connected, the N inverters comprise the first inverter, and N is an integer not less than 2;
after the reading the first state and controlling the first switch to be closed when the first state is a closed state, the upgrading method further comprises:
acquiring the current working state of the parallel operation system, wherein the current working state of the parallel operation system comprises an off-grid output state and a non-off-grid output state, and the off-grid output state is that the connection between the N inverters and the power grid is disconnected and is in an output state;
and controlling the first switch based on the current working state of the parallel operation system.
4. The upgrade method of claim 3 wherein the N inverters further comprise a second inverter connected to a second load;
the controlling the first switch based on the current working state of the parallel operation system includes:
when the current working state of the parallel operation system is the off-grid output state and the first load is connected with the second load, the first switch is controlled to be disconnected;
and when the current working state of the parallel operation system is the off-grid output state and the first load is not connected with the second load, or when the current working state of the parallel operation system is the non-off-grid output state, controlling the first switch to keep the current state unchanged.
5. The upgrade method according to claim 4, wherein the second inverter further comprises a second voltage conversion module and a third switch, the third switch being connected between the second voltage conversion module and the second load;
after said controlling said first switch to open, said upgrade method further comprises:
and if the first state is a closed state, outputting a control signal to the second inverter so that the second inverter controls the third switch to be closed.
6. The upgrade method according to claim 3, wherein prior to said obtaining the current operating state of the parallel machine system, the upgrade method further comprises:
collecting the voltage of the power grid port;
if the voltage of the power grid port is in the voltage range allowed to be born by the first load, acquiring the current working state of the parallel operation system;
and if the voltage of the power grid port is not in the voltage range allowed to be born by the first load, controlling the first switch to be disconnected.
7. An inverter, comprising a control module;
the control module includes:
at least one processor and a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.
8. The parallel operation system is characterized by comprising N inverters which are sequentially connected, wherein N is an integer which is more than or equal to 2;
at least one inverter of the N inverters is configured as the inverter of claim 7.
9. The parallel operation system according to claim 8, wherein the N inverters comprise a first inverter comprising a first voltage conversion module, a first switch, and a second switch;
the first voltage conversion module and the first load are connected with a power grid through the first switch, and the first voltage conversion module is also connected with the first load through the second switch.
10. The parallel operation system according to claim 9, wherein the N inverters further comprise a second inverter comprising a second voltage conversion module, a third switch, and a fourth switch;
the second voltage conversion module and the second load are both connected with the power grid through the third switch, and the second voltage conversion module is also connected with the second load through the fourth switch.
11. The parallel operation system according to claim 9, wherein the N inverters further comprise a third inverter comprising a third voltage conversion module, a fifth switch, and a sixth switch;
the third voltage conversion module and the third load are connected with the power grid through the fifth switch, and the third voltage conversion module is also connected with the third load and the first load through the sixth switch respectively.
12. A non-transitory computer readable storage medium storing computer executable instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1-6.
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| CN109936168A (en) * | 2019-04-30 | 2019-06-25 | 阳光电源股份有限公司 | A kind of inverter and its operation method and controller |
| CN210536304U (en) * | 2019-11-12 | 2020-05-15 | 爱士惟新能源技术(扬中)有限公司 | Grid-connected and off-grid switching circuit of photovoltaic inverter |
| WO2021144103A1 (en) * | 2020-01-16 | 2021-07-22 | Sma Solar Technology Ag | Changeover device, retrofit kit and method for supplying electrical power to a load |
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| CN103337900A (en) * | 2013-07-16 | 2013-10-02 | 天津城建大学 | Off-grid wind power supply system based on gird power complementation |
| CN109936168A (en) * | 2019-04-30 | 2019-06-25 | 阳光电源股份有限公司 | A kind of inverter and its operation method and controller |
| CN210536304U (en) * | 2019-11-12 | 2020-05-15 | 爱士惟新能源技术(扬中)有限公司 | Grid-connected and off-grid switching circuit of photovoltaic inverter |
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