CN116699474A - Three-phase ammeter phase sequence correction method and three-phase energy storage inverter - Google Patents
Three-phase ammeter phase sequence correction method and three-phase energy storage inverter Download PDFInfo
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- CN116699474A CN116699474A CN202310972412.0A CN202310972412A CN116699474A CN 116699474 A CN116699474 A CN 116699474A CN 202310972412 A CN202310972412 A CN 202310972412A CN 116699474 A CN116699474 A CN 116699474A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000819 phase cycle Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 18
- 229910001219 R-phase Inorganic materials 0.000 description 7
- 230000018199 S phase Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The application relates to a phase sequence correction method of a three-phase ammeter and a three-phase energy storage inverter, and belongs to the technical field of ammeter terminals. The method comprises the following steps: the switch module is controlled to be disconnected; the control module reads a first display voltage value of a first phase of the ammeter and compares the first display voltage value with a preset value; when the first display voltage value is larger than a preset value, the control module reads the three-phase voltage values of the inverter body, and when only one detected phase voltage value in the three-phase voltage values of the inverter body is larger than the preset value, the detected phase is determined to be connected to a first phase of the ammeter; controlling the switch module to be partially closed; the control module reads a second display voltage value of the second phase and compares the second display voltage value with a preset value; when the second display voltage value is larger than a preset value, the control module reads the voltage values of the remaining two phases, and when any one of the voltage values of the remaining two phases is larger than the preset value, the detected phase is determined to be connected into the second phase of the ammeter; the control switch module is fully closed.
Description
Technical Field
The application relates to a phase sequence correction method of a three-phase ammeter and a three-phase energy storage inverter, and belongs to the technical field of ammeter terminals.
Background
The problem of phase-misplacement compensation occurs when the ammeter is connected with the inverter. The method comprises the following steps: the R, S, T phase output of the inverter requires R, S, T phase loads to the household electricity meter to compensate for power separately to meet operational demands. For example: the R-phase output of the inverter requires power compensation of the R-phase load of the home according to the R-phase readings of the meter. However, if the meter misconvergence of the R phase to the S phase, miscompare compensation problems occur.
In the prior art, after the ammeter and the inverter are dismantled and separated, the three phases of the ammeter and/or the inverter can be determined, and then the determined three phases are respectively connected, so that the correct phase sequence connection between the ammeter and the inverter is ensured. However, such a method is cumbersome, and there are still cases where an error is confirmed.
Accordingly, there is a need for an improvement over the prior art to overcome the deficiencies described in the prior art.
Disclosure of Invention
The application aims to provide a phase sequence correction method of a three-phase ammeter and a three-phase energy storage inverter, which can identify whether phase sequence connection between the three-phase energy storage inverter and the three-phase ammeter is correct or not so as to complete automatic matching.
The application aims at realizing the following technical scheme: the method for correcting the phase sequence of the three-phase ammeter is suitable for a three-phase energy storage inverter, the three-phase energy storage inverter comprises an inverter body connected with the ammeter through a connecting wire, a switch module arranged between the inverter body and the ammeter, and a control module electrically connected with the inverter body, the switch module and the ammeter, and the method comprises the following steps:
controlling the switch module to be disconnected;
the control module reads a first display voltage value of a first phase of the ammeter and compares the first display voltage value with a preset value; when the first display voltage value is larger than the preset value, the control module reads three-phase voltage values of the inverter body, and when only one detected phase voltage value in the three-phase voltage values of the inverter body is larger than the preset value, the detected phase is determined to be connected into a first phase of the ammeter;
controlling the switch module to be partially closed;
the control module reads a second display voltage value of a second phase of the ammeter and compares the second display voltage value with a preset value; when the second display voltage value is larger than the preset value, the control module reads the residual two-phase voltage value of the inverter body, and when any one of the residual two-phase voltage values is larger than the preset value, the control module determines that the detected phase is connected to the second phase of the ammeter;
and controlling the switch module to be closed completely.
In one embodiment, the switch module includes a first switch and a second switch;
wherein the first switch is closed after one of the detection phases is determined corresponding to the first phase;
the second switch is closed after the other of the detection phases is correspondingly determined to the second phase.
In one embodiment, the first switch and the second switch are both relays.
In one embodiment, the three-phase energy storage inverter further comprises a compensation module, and the compensation module is connected between the inverter body and the switch module through a connecting wire.
In one embodiment, the compensation module includes a first compensation load, a second compensation load, and a third compensation load, the first compensation load is connected to a first phase of the electric meter, the second compensation load is connected to a second phase of the electric meter, and the third compensation load is connected to a third phase of the electric meter.
In one embodiment, the control module obtains the detected phase voltage value by reading a value of a port of the inverter body.
The application also relates to a three-phase energy storage inverter capable of implementing the three-phase ammeter phase sequence correction method, which comprises an inverter body connected with an ammeter through a connecting wire, a switch module arranged between the inverter body and the ammeter, and a control module electrically connected with the inverter body, the switch module and the ammeter.
In one embodiment, the three-phase energy storage inverter further comprises a compensation module, and the compensation module is connected between the inverter body and the switch module through a connecting wire.
Compared with the prior art, the application has the following beneficial effects: according to the application, the control module and the switch module are arranged in the three-phase energy storage inverter, when initial judgment is carried out, the control module controls the switch module to be opened, the first display voltage value of the first phase of the ammeter and the three-phase voltage value of the inverter body are respectively read, when the first display voltage value is larger than a preset value and only one detection phase voltage value in the three-phase voltage values is larger than the preset value, the detection phase is determined to be connected into the first phase, then the control module controls the switch module to be partially closed, the second display voltage value of the second phase of the ammeter and the remaining two-phase voltage value of the inverter body are respectively read, when the second display voltage value is larger than the preset value and the detection voltage value of any one phase in the remaining two-phase voltage values is larger than the preset value, the detection phase is determined to be connected into the second phase, meanwhile, the third phase is determined, and the switch module is controlled to be fully closed, so that the three-phase connection sequence of the ammeter and the inverter body is determined to be correct, and the method is fast and convenient, and the correct rate can be ensured.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a three-phase energy storage inverter according to the present application.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. 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.
The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, a phase sequence correction method for a three-phase ammeter according to a preferred embodiment of the application is suitable for a three-phase energy storage inverter. The three-phase energy storage inverter is suitable for being connected with an ammeter, and the ammeter can be a user ammeter, a production ammeter and the like, and is not particularly limited herein, and is determined according to practical conditions. Taking the utility meter as an example, when the utility meter is installed, the three phases of the utility meter and the three phases of the three-phase energy storage inverter need to be connected correctly, that is, the output of R, S, T phases of the three-phase energy storage inverter needs to correspond to R, S, T phases of the utility meter one by one, so as to perform power compensation. Wherein, the one-to-one correspondence means: the R phase of the three-phase energy storage inverter is connected with the R phase of the user ammeter, so that the R phase of the three-phase energy storage inverter performs power compensation on the R phase load of the household according to the R phase reading of the user ammeter.
However, when the R-phase of the three-phase energy storage inverter is connected to the S-phase in a staggered manner, a problem of phase-staggering compensation occurs.
Therefore, in order to solve the technical problem, the application provides a three-phase energy storage inverter. The three-phase energy storage inverter comprises an inverter body connected with the ammeter through a connecting wire, a switch module arranged between the inverter body and the ammeter, and a control module electrically connected with the inverter body, the switch module and the ammeter.
In this embodiment, the inverter body is an inverter with a conventional structure, and the inverter body is not improved correspondingly in the present application, so detailed description of the specific structure of the inverter body is omitted. The switch module comprises a first switch and a second switch, wherein the first switch and the second switch are relays. Meanwhile, the phase sequence of the first switch and the second switch is not particularly limited, and can be set according to actual conditions.
The control module comprises a controller, and the controller is connected with the user ammeter through RS485, so that the voltage value of each phase of the user ammeter is read. Meanwhile, the control module obtains the detected phase voltage value by reading the numerical value of the port of the inverter body. That is, the controller is also connected to the ports of the inverter body to read the voltage value of each phase of the inverter body. The controller is also of a conventional structure, and will not be described herein.
The three-phase energy storage inverter also comprises a compensation module, and the compensation module is connected between the inverter body and the switch module through a connecting wire. The compensation module comprises a first compensation load, a second compensation load and a third compensation load, wherein the first compensation load is connected with a first phase of the ammeter, the second compensation load is connected with a second phase of the ammeter, and the third compensation load is connected with a third phase of the ammeter. It should be noted that, in the present embodiment, the first phase, the second phase and the third phase of the electric meter are merely for indicating the distinction between the phase sequences, and there is no order of fixing the phase sequences. As can be seen from the foregoing, the three-phase energy storage inverter and the consumer electric meter each have R, S, T phases, and thus the first phase may be any one of R, S, T phases. Similarly, the second phase may be any of the R, S, T phases, and the third phase may be any of the R, S, T phases, but the first, second, and third phases are different from each other.
The application also provides a three-phase ammeter phase sequence correction method which can be implemented by the three-phase energy storage inverter, and the phase sequence identification can be realized by the method, so that the inverter body and the ammeter are mutually adapted to each other in three-phase electrical phase sequence. Specifically, the correction method for the phase sequence of the three-phase ammeter comprises the following steps:
step S1: the control switch module is turned off. That is, during this step, both the first switch and the second switch in the switch module remain in an off state.
Step S2: the control module reads a first display voltage value of a first phase of the ammeter and compares the first display voltage value with a preset value; when the first display voltage value is larger than a preset value, the control module reads the three-phase voltage values of the inverter body, and when only one detected phase voltage value in the three-phase voltage values of the inverter body is larger than the preset value, the detected phase is determined to be connected to a first phase of the ammeter.
In this step, the first phase of the electric meter is matched with one phase of the three-phase voltage values of the inverter body, and the first phase is not represented as the first phase in sequence, which is merely for convenience of description.
Step S3: the control switch module is partially closed. In this step, the control switch module is partially closed to control the first switch to close. That is, the first switch is closed after one of the detection phases is determined corresponding to the first phase.
Step S4: the control module reads a second display voltage value of a second phase of the ammeter and compares the second display voltage value with a preset value; when the second display voltage value is larger than a preset value, the control module reads the remaining two-phase voltage values of the inverter body, and when any one of the remaining two-phase voltage values is larger than the preset value, the control module determines that the detected phase is connected into the second phase of the ammeter;
step S5: the control switch module is fully closed. In this step, the control switch module is fully closed: the remaining second switches are controlled to close. That is, the second switch is closed after the correspondence between the other detection phase and the second phase is determined.
In the above method, the preset value may be set according to the actual situation, and the present application is not limited in particular.
Referring to fig. 1, the following describes the method according to an embodiment.
In this embodiment, the first switch and the second switch are denoted as a first relay RY3 and a second relay RY4, respectively, the first phase is a T phase, the second phase is an R phase, the third phase is an S phase, and the preset value is 200V.
Step S201: the control module controls the first relay RY3 and the second relay RY4 to be opened.
Step S202: the control module reads the T-phase voltage value VT2 of the ammeter through RS485, when the T-phase voltage value VT2 is larger than 200V, the control module reads each phase detection voltage value VR1, VS1 and VT1 of the sampling port of the inverter body, and when 1 value in each phase detection voltage value is larger than 200V, the detection of the T-phase of the corresponding ammeter is indicated. Such as: r1 of the inverter body is connected to a T phase of an ammeter;
step S203: after the ammeter T phase is eliminated, ammeter R phase judgment is carried out. The first relay RY3 is controlled to be closed, and the control module reads the R-phase voltage VR2 of the ammeter. When the R-phase voltage VR2 is greater than 200V, the control module reads the remaining two detected phase voltage values of the sampling port of the inverter body, and if the detected phase voltage value is greater than 200V, it indicates that the detected phase voltage value corresponds to the R-phase of the ammeter. Such as: the S1 of the inverter body is connected to the R phase of the ammeter;
step S204: the remaining detection of the sampling port corresponds to the ammeter S phase.
Step S205: finally, the second relay RY4 is closed.
To sum up: according to the application, the control module and the switch module are arranged in the three-phase energy storage inverter, when initial judgment is carried out, the control module controls the switch module to be opened, the first display voltage value of the first phase of the ammeter and the three-phase voltage value of the inverter body are respectively read, when the first display voltage value is larger than a preset value and only one detection phase voltage value in the three-phase voltage values is larger than the preset value, the detection phase is determined to be connected into the first phase, then the control module controls the switch module to be partially closed, the second display voltage value of the second phase of the ammeter and the remaining two-phase voltage value of the inverter body are respectively read, when the second display voltage value is larger than the preset value and the detection voltage value of any one phase in the remaining two-phase voltage values is larger than the preset value, the detection phase is determined to be connected into the second phase, meanwhile, the third phase is determined, and the switch module is controlled to be fully closed, so that the three-phase connection sequence of the ammeter and the inverter body is determined to be correct, and the method is fast and convenient, and the correct rate can be ensured.
The foregoing is merely one specific embodiment of the application, and any modifications made in light of the above teachings are intended to fall within the scope of the application.
Claims (8)
1. The phase sequence correction method for the three-phase ammeter is suitable for a three-phase energy storage inverter, and the three-phase energy storage inverter comprises an inverter body connected with the ammeter through a connecting wire, a switch module arranged between the inverter body and the ammeter, and a control module electrically connected with the inverter body, the switch module and the ammeter, and is characterized by comprising the following steps:
controlling the switch module to be disconnected;
the control module reads a first display voltage value of a first phase of the ammeter and compares the first display voltage value with a preset value; when the first display voltage value is larger than the preset value, the control module reads three-phase voltage values of the inverter body, and when only one detected phase voltage value in the three-phase voltage values of the inverter body is larger than the preset value, the detected phase is determined to be connected into a first phase of the ammeter;
controlling the switch module to be partially closed;
the control module reads a second display voltage value of a second phase of the ammeter and compares the second display voltage value with a preset value; when the second display voltage value is larger than the preset value, the control module reads the residual two-phase voltage value of the inverter body, and when any one of the residual two-phase voltage values is larger than the preset value, the control module determines that the detected phase is connected to the second phase of the ammeter;
and controlling the switch module to be closed completely.
2. The method of phase sequence correction for a three-phase electric meter of claim 1, wherein the switch module includes a first switch and a second switch;
wherein the first switch is closed after one of the detection phases is determined corresponding to the first phase;
the second switch is closed after the other of the detection phases is correspondingly determined to the second phase.
3. The method of claim 2, wherein the first switch and the second switch are relays.
4. The method of phase sequence correction for a three-phase electric meter of claim 1, wherein the three-phase energy storage inverter further comprises a compensation module connected between the inverter body and the switching module by a connecting wire.
5. The method of claim 4, wherein the compensation module includes a first compensation load, a second compensation load, and a third compensation load, the first compensation load being coupled to a first phase of the electric meter, the second compensation load being coupled to a second phase of the electric meter, the third compensation load being coupled to a third phase of the electric meter.
6. The method of phase sequence correction for a three-phase electric meter according to any one of claims 1 to 5, wherein the control module obtains the detected phase voltage value by reading a value of a port of the inverter body.
7. A three-phase energy storage inverter capable of implementing the phase sequence correction method of a three-phase electric meter according to any one of claims 1 to 6, characterized in that it comprises an inverter body connected to an electric meter through a connection wire, a switching module arranged between the inverter body and the electric meter, and a control module electrically connected to the inverter body, the switching module and the electric meter.
8. The three-phase energy storage inverter of claim 7, further comprising a compensation module interposed between the inverter body and the switch module by a connecting wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310972412.0A CN116699474B (en) | 2023-08-03 | 2023-08-03 | Three-phase ammeter phase sequence correction method and three-phase energy storage inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310972412.0A CN116699474B (en) | 2023-08-03 | 2023-08-03 | Three-phase ammeter phase sequence correction method and three-phase energy storage inverter |
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| CN116699474B CN116699474B (en) | 2023-10-27 |
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Cited By (1)
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| CN116699474B (en) | 2023-10-27 |
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