CN115420942A - Electric energy measuring device and power supply system - Google Patents
Electric energy measuring device and power supply system Download PDFInfo
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- CN115420942A CN115420942A CN202211377094.5A CN202211377094A CN115420942A CN 115420942 A CN115420942 A CN 115420942A CN 202211377094 A CN202211377094 A CN 202211377094A CN 115420942 A CN115420942 A CN 115420942A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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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
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Abstract
The embodiment of the application provides an electric energy measuring device and power supply system, and this power supply system supplies power to the load through transmission line, and electric energy measuring device couples the electric parameter that transmission line is used for acquireing transmission line, and this electric energy measuring device includes: the straight-through current sampling interface is used for coupling a power transmission line; the mutual inductance type current sampling interface is used for being coupled with the current mutual inductance unit and is coupled with the power transmission line through the current mutual inductance unit; the input end of the switch module is coupled with the through type current sampling interface and the mutual inductance type current sampling interface; the detection module is coupled with the output end of the switch module, the detection module is configured to control the switch module to be communicated with a current path between the through type current sampling interface and the current path between the mutual inductance type current sampling interface and the detection module, and the detection module is further configured to detect the current of the current signal input through the switch module after the current path is communicated. Through the mode, various power supply scenes can be compatible, and the measurement cost is reduced.
Description
Technical Field
The application relates to the technical field of power supply, in particular to an electric energy measuring device and a power supply system.
Background
The novel power supply system is a power system which is based on the premise of bearing, realizing carbon peak carbon neutralization, implementing new development concepts, constructing new development patterns and promoting high-quality development, ensures energy power safety as a basic premise, takes meeting the power demand for economic and social development as a primary target, takes maximum consumption of new energy as a main task, takes a strong smart grid as a hub platform and takes source grid load storage interaction and multi-energy complementation as support, and has the basic characteristics of cleanness, low carbon, safety, controllability, flexibility, high efficiency, intelligence, friendliness and open interaction.
Compared with the traditional power supply system, the novel power supply system is additionally provided with an additional power supply end, and when different power supply ends supply power to a load, power supply parameters are not necessarily the same. In this case, conventional measuring devices are clearly not able to satisfy complex power supply scenarios.
Disclosure of Invention
The embodiment of the application provides an electric energy measuring device and a power supply system, and aims to solve the problem that in a novel power supply system in the related art, a traditional measuring instrument cannot realize multiple scene electric energy measurement.
The application provides an electric energy measuring device, this electric energy measuring device is applied to power supply system, and this power supply system supplies power to the load through transmission line, and this electric energy measuring device is coupled transmission line and is used for acquireing transmission line's electrical parameter, and this electric energy measuring device includes: the straight-through type current sampling interface is used for coupling a power transmission line; the mutual inductance type current sampling interface is used for being coupled with the current mutual inductance unit and is coupled with the power transmission line through the current mutual inductance unit; the input end of the switch module is coupled with the straight-through current sampling interface and the mutual inductance current sampling interface; the detection module is coupled with the output end of the switch module, the detection module is configured to control the switch module to be communicated with a current path between the through type current sampling interface and the current path between the mutual inductance type current sampling interface and the detection module, and the detection module is further configured to detect the current of the current signal input through the switch module after the current path is communicated.
In some embodiments, the input terminals of the switch module include a first input terminal and a second input terminal, wherein the first input terminal of the switch module is coupled to the pass-through current sampling interface, and the second input terminal of the switch module is coupled to the mutual inductance current sampling interface; the detection module includes: the input end of the electric energy metering unit is coupled with the output end of the switch module, and the electric energy metering unit is configured to sample an input current signal to obtain current metering data; and the control unit is coupled with the control end of the switch module and the control end of the electric energy metering unit, and is configured to control the switch module to be communicated with a current path between the through type current sampling interface and the electric energy metering unit and a current path between the mutual inductance type current sampling interface and the electric energy metering unit, and obtain current metering data of the electric energy metering unit.
In some embodiments, the control unit is configured to: the control switch module is communicated with a current path between the straight-through current sampling interface and the electric energy metering unit; and in response to the fact that the electric energy metering unit does not sample the current metering data in the communication state of the through type current sampling interface and the electric energy metering unit, the switch module is controlled to be communicated with a current path between the mutual inductance type current sampling interface and the electric energy metering unit.
In some embodiments, the control unit is configured to: and in response to the communication state of the mutual inductance type current sampling interface and the electric energy metering unit, the electric energy metering unit does not sample the current metering data, and prompt information for manually configuring the current sampling interface is generated.
In some embodiments, the electrical energy measurement device further comprises: the voltage sampling interface is used for coupling the power transmission line; the electric energy metering unit is configured to sample an input voltage signal through a voltage sampling interface to obtain voltage metering data; the control unit is configured to acquire voltage metering data of the electric energy metering unit.
In some embodiments, the control unit is configured to: and determining a corresponding current phase angle according to the current metering data, determining a corresponding voltage phase angle according to the voltage metering data, and determining a corresponding first wiring mode according to the current phase angle and the voltage phase angle, wherein the first wiring mode comprises a three-phase three-wire mode and a three-phase four-wire mode.
In some embodiments, the control unit is configured to: and determining a corresponding second wiring mode according to the current measurement data and the voltage measurement data, wherein the second wiring mode comprises a straight-through mode, a current mutual inductance mode and a current/voltage mutual inductance mode.
In some embodiments, the control unit is configured to: when the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold value and the current value corresponding to the current metering data is smaller than the reference current threshold value, determining that the corresponding second wiring mode is a straight-through mode; or when the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold value and the current value corresponding to the current metering data is larger than the reference current threshold value, determining that the corresponding second wiring mode is a current mutual inductance mode; or when the voltage value corresponding to the voltage metering data is larger than the reference voltage threshold value and the current value corresponding to the current metering data is larger than the reference current threshold value, determining that the corresponding second wiring mode is a current/voltage mutual inductance mode.
In some embodiments, the at least two power supplies comprise an energy storage power supply; the electric energy measuring device further comprises a communication unit, wherein the communication unit is coupled with the control unit and is configured to communicate with the energy storage power supply terminal to obtain power supply data of the energy storage power supply terminal and send the power supply data to the control unit.
The present application also provides a power supply system, including: a power supply terminal; the power transmission line is coupled with the power supply end and the load so that the power supply end supplies power to the load; the electric energy measuring device is coupled with the power transmission line; the electric energy measuring device is the electric energy measuring device.
The electric energy measuring device provided by the embodiment of the application comprises the through type current sampling interface and the mutual inductance type current sampling interface, and the switch module can freely control the switching of the two interfaces through the control logics of the switch module and the control unit, so that the electric energy measuring device can adapt to different current environments. Furthermore, the current mutual inductance unit between the mutual inductance type current sampling interface and the power transmission line belongs to external configuration, and parameters of the current mutual inductance unit can be set according to the current sampling range of actual requirements, so that the current detection application range of the electric energy measuring device is larger. Still further, when the embodiment is applied to an application scenario of a power supply system with multiple power supply terminals, or when the power supply terminals in multiple functional systems are different, it is not necessary to set multiple different types of electric energy measuring devices in the power supply system, and the electric energy measuring device of the embodiment can be adapted to the power supply environment of multiple power supply terminals or multiple power supply systems, thereby reducing the circuit complexity in the power supply system and reducing the cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an electric energy measuring device provided in the first embodiment of the present application;
fig. 3 is a schematic structural diagram of an electric energy measuring device provided in a second embodiment of the present application;
fig. 4 is a schematic structural diagram of an electric energy measuring device provided in a third embodiment of the present application;
fig. 5 is a schematic diagram illustrating a start-up process of an electric energy measuring device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electric energy measuring device provided in a fourth embodiment of the present application;
fig. 7 is a schematic structural diagram of an electric energy measuring apparatus according to a fifth embodiment of the present application.
Description of the main element symbols:
100-power supply system, 10-electric energy measuring device, 111-straight-through type current sampling interface, 112-mutual inductance type current sampling interface, 113-voltage sampling interface, 114-power interface, 12-switch module, 13-detection module, 131-electric energy metering unit, 132-control unit, 14-communication unit, 15-power management unit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered limiting of the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.
The use of "adapted to" or "configured to" in this application means open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps. Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply system provided in an embodiment of the present application, where the power supply system 100 includes a power supply terminal, a power transmission line for coupling the power supply terminal and a load, and an electric energy measuring device 10 coupled to the power transmission line for measuring.
It should be noted that if there is only one power supply terminal in the power supply system 100, the power measuring device 10 can be coupled to the power transmission line between the power supply terminal and the load; if there are multiple power supply terminals in the power supply system 100, the power measuring device 10 may be coupled to a power line between any power supply terminal and a load, or may be coupled to a power line between any multiple power supply terminals and a load at the same time. That is, the number of power supply terminals is not limited in the present embodiment, and the power measuring device 10 of the present embodiment is suitable for use in the environment of any number of power supply systems.
Fig. 1 schematically illustrates an energy storage power supply terminal, a new energy power supply terminal, and a power grid power supply terminal (the number and the types of the power supply terminals are not limited), in an optional application scenario, in the power supply system 100, when the new energy power supply terminal can meet a power supply requirement of a load, the new energy power supply terminal supplies power, and redundant electric energy generated by the new energy power supply terminal can be stored in the energy storage power supply terminal; when the new energy power supply end cannot meet the power supply requirement of the load, the energy storage power supply end supplies power; and when the new energy power supply end and the energy storage power supply end can not meet the power supply requirement of the load, the power supply end of the power grid supplies power.
The new energy power supply end can be a photovoltaic power supply end, a wind power supply end, a biomass power supply end, a tide power supply end and the like. Alternatively, the power measuring device 10 can be connected to the power line of at least two power supply terminals to adapt to the measurement of the power supply parameters of different power supply terminals. In the above application scenario, since the energy storage power supply terminal generally has a function of measuring electric energy, the electric energy measuring apparatus 10 may only measure the electric transmission lines of the new energy power supply terminal and the power grid power supply terminal.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an electric energy measuring device according to a first embodiment of the present application, and it should be noted that the electric transmission line in fig. 2 is only schematically represented by one line, and actually the electric transmission line generally consists of a plurality of lines. The electric energy measuring device 10 comprises a through current sampling interface 111, a mutual inductance current sampling interface 112, a switch module 12 and a detection module 13.
The through-type current sampling interface 111 is used for coupling with a power transmission line; the mutual inductance type current sampling interface 112 is configured to be coupled to a current mutual inductance unit (not shown), and coupled to a power transmission line via the current mutual inductance unit; the input end of the switch module 12 is coupled to the through current sampling interface 111 and the mutual inductance current sampling interface 112; the detection module 13 is coupled to the output end of the switch module 12, the detection module 13 is configured to control the switch module 12 to connect the current paths between the pass-through current sampling interface 111 and the mutual inductance current sampling interface 112 and the detection module 13, and the detection module 13 is further configured to perform current detection on the current signal input through the switch module after the current paths are connected.
Specifically, the input terminals of the switch module 12 may include a first input terminal coupled to the pass-through current sampling interface 111, a second input terminal coupled to the mutual inductance current sampling interface 112, an output terminal coupled to the detection module 13, and a control terminal coupled to the detection module 13. The detection module 13 controls the operation of the switch module 12 through the control terminal, when the detection module 13 controls the switch module 12 to switch on the current path between the through current sampling interface 111 and the detection module 13, the detection module 13 may detect the current signal input by the through current sampling interface 111 via the switch module 12, and when the detection module 13 controls the switch module 12 to switch on the current path between the mutual inductance current sampling interface 111 and the detection module 13, the detection module 13 may detect the current signal input by the mutual inductance current sampling interface 112 via the switch module 12.
Alternatively, the switch module 12 may employ an analog switch, which mainly performs a signal switching function in a signal link. The analog switch generally adopts a switching mode of an MOS tube to realize the switching-off or switching-on of a signal link. Specifically, the high-frequency T-switch, ESD (Electro-Static discharge) protection switch, multiplexer, etc. may be used, but not limited thereto.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an electric energy measuring device according to a second embodiment of the present application, in which the electric energy measuring device 10 includes a through current sampling interface 111, a mutual inductance current sampling interface 112, a switch module 12, and a detection module 13, where the detection module 13 includes an electric energy metering unit 131 and a control unit 132.
The straight-through current sampling interface 111 is used for being coupled with a power transmission line; the mutual inductance type current sampling interface 112 is configured to be coupled to a current mutual inductance unit (not shown), and coupled to a power transmission line via the current mutual inductance unit; the switch module 12 may include a first input terminal coupled to the pass-through current sampling interface 111, a second input terminal coupled to the mutual inductance current sampling interface 112, an output terminal coupled to an input terminal of the power metering unit 131, a control terminal coupled to the control unit 132, and a control terminal of the power metering unit 131 coupled to the control unit 132. The control unit 132 controls the operation of the switch module 12 through the control end, when the control unit 132 controls the switch module 12 to switch on the current path between the through current sampling interface 111 and the electric energy metering unit 131, the electric energy metering unit 131 may sample the current signal input by the through current sampling interface 111 to obtain corresponding current metering data, and when the control unit 132 controls the switch module 12 to switch on the current path between the mutual inductance current sampling interface 111 and the electric energy metering unit 131, the electric energy metering unit 131 may sample the current signal input by the mutual inductance current sampling interface 112 to obtain corresponding current metering data.
Optionally, the electric energy metering unit 131 may actively send the collected current metering data to the control unit 132 according to a setting, for example, a preset sending frequency, and the electric energy metering unit 131 sends the current metering data to the control unit 132 according to the set frequency; in other embodiments, the acquisition may be performed actively by the control unit 132, for example, the control unit 132 sends a data acquisition instruction to the electric energy metering unit 131, and the electric energy metering unit 131 sends the electric current metering data to the control unit 132 in response to the data acquisition instruction.
Optionally, the electric energy metering unit 131 may be an electric energy metering chip of V9240 or V9260S, and the following description takes V9240 as an example, and the pin parameters of the V9240S chip are as follows in table 1:
TABLE 1
It can be understood that, in practical applications, the 2 nd/3 th pin of the V9240S chip can be used as an input of a current signal, the 4 th/5 th pin can be used as an input of a circuit signal, and the 13 th/14 th pin can be coupled to the control unit 132 for transmitting metering data.
In combination with the above embodiments of fig. 2 and fig. 3, optionally, in an application scenario, the control unit 132 first controls the switch module 12 to connect the current path between the through current sampling interface 111 and the electric energy metering unit 131, and performs current sampling by using the electric energy metering unit 131.
If the current measurement data can be sampled at this time, the electric energy measurement unit 131 sends the current measurement data to the control unit 132, and the control unit 132 controls the switch module 12 to maintain the connection state between the through current sampling interface 111 and the electric energy measurement unit 131.
If the control unit 132 does not receive the electric energy metering data sent by the electric energy metering unit 131 at this time (or within a preset time period), the control unit 132 controls the switch module 12 to connect the current path between the mutual inductance type current sampling interface 112 and the electric energy metering unit 131, so as to collect the current signal input by the mutual inductance type current sampling interface 112 by using the electric energy metering unit 131.
Further, after the control unit 132 controls the switch module 12 to connect the current path between the mutual inductance type current sampling interface 112 and the electric energy metering unit 131, if the control unit 132 does not receive the electric energy metering data sent by the electric energy metering unit 131 at this time, a prompt message for manually configuring the current sampling interface is generated. For example, the sound prompt, the light prompt, the text display prompt, and the like may be used.
In the above embodiment, the electric energy measuring device includes both the through-type current sampling interface and the mutual inductance-type current sampling interface, and the switch module can freely control the switching between the two interfaces through the control logic of the switch module and the control unit, so that the electric energy measuring device can adapt to different current environments. Furthermore, the current mutual inductance unit between the mutual inductance type current sampling interface and the power transmission line belongs to external configuration, and parameters of the current mutual inductance unit can be set according to the current sampling range of actual requirements, so that the current detection application range of the electric energy measuring device is larger. Furthermore, the embodiment is applied to a power supply system with multiple power supply ends, and the power supply system does not need to be provided with electric energy measuring devices of different models, and the electric energy measuring device of the embodiment can adapt to the power supply environment of the multiple power supply ends, thereby reducing the circuit complexity in the power supply system and lowering the cost.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electric energy measuring device according to a third embodiment of the present disclosure, in which the electric energy measuring device 10 includes a through current sampling interface 111, a mutual inductance current sampling interface 112, a voltage sampling interface 113, a switch module 12, and a detection module 13, where the detection module 13 includes an electric energy metering unit 131 and a control unit 132.
The straight-through current sampling interface 111 is used for being coupled with a power transmission line; the mutual inductance type current sampling interface 112 is configured to be coupled to a current mutual inductance unit (not shown), and coupled to a power transmission line via the current mutual inductance unit; the switch module 12 may include a first input terminal coupled to the pass-through current sampling interface 111, a second input terminal coupled to the mutual inductance current sampling interface 112, an output terminal coupled to the input terminal of the power metering unit 131, a control terminal coupled to the control unit 132, and an output terminal of the power metering unit 131 coupled to the control unit 132. The control unit 132 controls the operation of the switch module 12 through the control end, when the control unit 132 controls the switch module 12 to switch on the current path between the through current sampling interface 111 and the electric energy metering unit 131, the electric energy metering unit 131 may sample the current signal input by the through current sampling interface 111 to obtain corresponding current metering data, and when the control unit 132 controls the switch module 12 to switch on the current path between the mutual inductance current sampling interface 111 and the electric energy metering unit 131, the electric energy metering unit 131 may sample the current signal input by the mutual inductance current sampling interface 112 to obtain corresponding current metering data.
The voltage sampling interface 113 is configured to be coupled to a power transmission line, the electric energy metering unit 131 is configured to sample an input voltage signal through the voltage sampling interface 113 to obtain voltage metering data, and the control unit 132 is configured to obtain the voltage metering data of the electric energy metering unit 132.
In an embodiment, the coupling mode between the voltage sampling interface and the power transmission line may be configured according to actual requirements, for example, a straight-through type may be adopted, or a mutual inductance type may be adopted, and if a mutual inductance type is adopted, a voltage mutual inductance unit may be disposed between the voltage sampling interface and the power transmission line.
In another embodiment, a voltage sampling interface may be additionally added in a manner similar to current sampling, one of the two voltage sampling interfaces adopts a straight-through type, the other adopts a mutual inductance type, and a switch module is additionally provided for gating and controlling a path between the two voltage sampling interfaces and the electric energy metering unit 131.
It is understood that, due to the increase of the voltage sampling interface, the number of the power metering units 131 may be multiple, and the multiple power metering units 131 are controlled by one control unit 132.
Next, with reference to fig. 5, a boot process of the electric energy measurement device provided in the foregoing embodiment is described, where fig. 5 is a schematic boot process of the electric energy measurement device provided in an embodiment of the present application, and specifically, the following steps are performed:
1. the control unit 132 firstly controls the switch module 12 to connect the current path between the through current sampling interface 111 and the electric energy metering unit 131, and performs current sampling by using the electric energy metering unit 131. If the current measurement data can be sampled at this time, the electric energy measurement unit 131 sends the current measurement data to the control unit 132, and the control unit 132 controls the switch module 12 to maintain the connection state between the through current sampling interface 111 and the electric energy measurement unit 131.
2. If the control unit 132 does not receive the electric energy metering data sent by the electric energy metering unit 131 at this time (or within a preset time period), the control unit 132 controls the switch module 12 to connect the current path between the mutual inductance type current sampling interface 112 and the electric energy metering unit 131, so as to collect the current signal input by the mutual inductance type current sampling interface 112 by using the electric energy metering unit 131. If the current measurement data can be sampled at this time, the electric energy measurement unit 131 sends the current measurement data to the control unit 132, and the control unit 132 controls the switch module 12 to maintain the connection state between the mutual inductance type current sampling interface 112 and the electric energy measurement unit 131.
3. After the control unit 132 controls the switch module 12 to connect the current path between the mutual inductance type current sampling interface 112 and the electric energy metering unit 131, if the control unit 132 does not receive the electric energy metering data sent by the electric energy metering unit 131 at this time, a prompt message for manually configuring the current sampling interface is generated.
4. Based on the sampled current measurement data and voltage measurement data, control unit 132 determines a corresponding current phase angle from the current measurement data, determines a corresponding voltage phase angle from the voltage measurement data, and determines a corresponding first connection method from the current phase angle and the voltage phase angle, where the first connection method includes a three-phase three-wire connection method and a three-phase four-wire connection method.
Three-phase three-wire for supplying electric motor with electric power to loads, line voltage U ab 、U bc 、U ca Sequentially lags behind by 120 degrees. If the three-phase load is symmetrical, the three line currents are also sequentially behind by an angle of 120. For a typical inductive load, the line current is approximately several tens of degrees behind the corresponding line voltage. If a resistive load, the angle is zero.
The three-phase four-wire is used for supplying power to a load with mixed power and illumination, and the illumination load is connected below three phase voltages respectively and is distributed uniformly as much as possible. The line currents may not lag each other by an angle of 120 degrees, the line currents lag the corresponding line voltages, and the phase currents lag the corresponding phase voltages by an angle of about several tens of degrees.
Therefore, the corresponding wiring manner can be determined according to the detected phase angle of the voltage and the current based on the principle.
In another embodiment, the control unit 132 may further determine a corresponding second connection mode according to the current measurement data and the voltage measurement data, where the second connection mode includes a through mode, a current mutual inductance mode, and a current/voltage mutual inductance mode.
Specifically, in response to that the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold and the current value corresponding to the current metering data is smaller than the reference current threshold, determining that the corresponding second wiring mode is a through mode; or in response to that the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold and the current value corresponding to the current metering data is larger than the reference current threshold, determining that the corresponding second wiring mode is a current mutual inductance mode; or in response to that the voltage value corresponding to the voltage metering data is greater than the reference voltage threshold and the current value corresponding to the current metering data is greater than the reference current threshold, determining that the corresponding second wiring mode is a current/voltage mutual inductance mode.
In an application scenario, the reference voltage threshold may be set to 500V, and the current reference threshold may be set to 80A, specifically, the phase voltage of the power transmission line is less than 500V, and the phase current is less than 80A, and a three-phase three-wire or three-phase four-wire straight-through connection manner is adopted; the phase voltage of the transmission line is less than 500V, the phase current is more than 80A, and a three-phase three-wire or three-phase four-wire current mutual inductance type wiring mode is adopted; the phase voltage of the transmission line is more than 500V, the phase current is more than 80A, and a three-phase three-wire or three-phase four-wire voltage/current mutual inductance type wiring mode is adopted.
The direct-through type wiring mode is that the direct-through type current sampling interface 111 is directly coupled with the power transmission line in a three-phase three-wire or three-phase four-wire mode, and the voltage sampling interface is directly coupled with the power transmission line in a three-phase three-wire or three-phase four-wire mode; the current mutual inductance type wiring mode is that a mutual inductance type current sampling interface is coupled with the power transmission line through a current mutual inductance unit in a three-phase three-wire or three-phase four-wire mode, and a voltage sampling interface is directly coupled with the power transmission line in a three-phase three-wire or three-phase four-wire mode; the voltage/current mutual inductance type wiring mode is that the mutual inductance type current sampling interface is coupled with the power transmission line through the current mutual inductance unit in a three-phase three-wire or three-phase four-wire mode, and the voltage sampling interface is directly coupled with the power transmission line through the voltage mutual inductance unit in a three-phase three-wire or three-phase four-wire mode.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an electric energy measuring device according to a fourth embodiment of the present disclosure, in which the electric energy measuring device 10 includes a pass-through current sampling interface 111, a mutual inductance current sampling interface 112, a voltage sampling interface 113, a switch module 12, a detection module 13, and a communication unit 14, where the detection module 13 includes an electric energy metering unit 131 and a control unit 132.
In combination with the application scenario of the power supply system 100, the power supply terminals include an energy storage power supply terminal, a new energy power supply terminal, and a power grid power supply terminal, and since the energy storage power supply terminal generally has a function of measuring power, the power measurement apparatus 10 can only measure the power transmission lines of the new energy power supply terminal and the power grid power supply terminal. Therefore, the electric energy measuring device 10 may obtain a power supply parameter when the new energy power supply terminal supplies power to the load, and may also obtain a power supply parameter when the power grid power supply terminal supplies power to the load.
In the present embodiment, the communication unit 14 is configured to communicate with the energy storage power supply terminal (not shown) to obtain power supply data of the energy storage power supply terminal and send the power supply data to the control unit.
Through the above manner, the control unit 132 can acquire the power supply data of the energy storage power supply end, the new energy power supply end and the power grid power supply end for supplying power to the load, so that various power supply data can be conveniently recorded and contrasted and analyzed.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electric energy measuring device according to a fifth embodiment of the present disclosure, in which the electric energy measuring device 10 includes a through current sampling interface 111, a mutual inductance current sampling interface 112, a voltage sampling interface 113, a power interface 114, a switch module 12, a detection module 13, a communication unit 14, and a power management unit 15, where the detection module 13 includes an electric energy metering unit 131 and a control unit 132.
The power interface 114 is coupled to the power transmission line in a straight-through manner, the power management unit 15 is coupled to the power interface 114 through a relay (not shown), the power management unit 15 is coupled to the electric energy metering unit 131 and the control unit 132 to supply power to the electric energy metering unit 131 and the control unit 132, and the control unit 132 is coupled to the relay to control the relay to adjust a connection mode (three-phase three-wire or three-phase four-wire) between the power interface and the power management unit 15. For example, the transmission line comprises four lines of Ua, ub, uc and Un, wherein Ua, ub, uc are used for transmitting three-phase voltages, un is grounded, and the relay is coupled to Ub and Un.
It should be noted that, if the voltage sampling interface 113 is coupled to the power transmission line in a pass-through manner, the voltage sampling interface 113 and the power interface 114 may share one interface.
With the combination of the above embodiments, the application has the following beneficial effects:
firstly, the embodiment of the application comprises a straight-through current sampling interface and a mutual inductance current sampling interface, and can be compatible with different power supply scenes, such as a scene that a power supply system comprises a plurality of power supply ends, and a plurality of electric energy measuring devices are not required to be configured in one power supply system, so that the circuit layout space is saved, the complexity of a circuit is reduced, and the cost is reduced;
and secondly, the plurality of interfaces are controlled by the switch control logic to sequentially carry out current detection, so that different power supply scenes are compatible, the current detection is more intelligent, and the detection efficiency is improved.
Thirdly, the mutual inductance unit is externally arranged, the corresponding voltage mutual inductance unit or current mutual inductance unit can be configured according to the specific conditions of the power supply end, the power transmission line and the load, the electric energy measuring device only needs to be subjected to one-time precision calibration when leaving a factory, other parameters such as the measuring range and the like can be set without according to the actual conditions of the circuit, only the mutual inductance unit needs to be correspondingly adjusted, and the expandability of the electric energy measuring device is enhanced.
And fourthly, the method is compatible with various wiring modes, and can intelligently determine whether a three-phase three-wire wiring mode or a three-phase four-wire wiring mode is adopted according to voltage and current data so as to carry out corresponding configuration outside.
And fifthly, acquiring power supply data of the energy storage power supply section through the communication unit so that the control unit can compare and analyze the power supply data of the plurality of power supply ends.
The display screen provided by the embodiment of the present application is described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. An electric energy measuring device is applied to a power supply system which supplies power to a load through a power transmission line, and is characterized in that the electric energy measuring device is coupled with the power transmission line and used for acquiring electric parameters of the power transmission line, and the electric energy measuring device comprises:
the straight-through current sampling interface is used for coupling the power transmission line;
the mutual inductance type current sampling interface is used for being coupled with a current mutual inductance unit and being coupled with the power transmission line through the current mutual inductance unit;
the input end of the switch module is coupled with the straight-through current sampling interface and the mutual inductance current sampling interface;
the detection module is coupled to the output end of the switch module, the detection module is configured to control the switch module to communicate with current paths between the pass-through current sampling interface and the mutual inductance current sampling interface and the detection module, and the detection module is further configured to perform current detection on a current signal input through the switch module after the current paths are communicated.
2. The electrical energy measurement device of claim 1, wherein the input terminals of the switch module comprise a first input terminal and a second input terminal, wherein,
the first input end of the switch module is coupled with the through current sampling interface, and the second input end of the switch module is coupled with the mutual inductance current sampling interface;
the detection module comprises:
the input end of the electric energy metering unit is coupled with the output end of the switch module, and the electric energy metering unit is configured to sample an input current signal to obtain current metering data;
the control unit is coupled with the control end of the switch module and the control end of the electric energy metering unit, and is configured to control the switch module to communicate with current paths between the through current sampling interface and the mutual inductance current sampling interface and the electric energy metering unit, and to obtain the electric current metering data of the electric energy metering unit.
3. The electrical energy measurement device of claim 2,
the control unit is configured to:
controlling the switch module to be communicated with a current path between the straight-through current sampling interface and the electric energy metering unit; and
and in response to the communication state of the through current sampling interface and the electric energy metering unit, the electric energy metering unit does not sample current metering data, and the switch module is controlled to communicate a current path between the mutual inductance current sampling interface and the electric energy metering unit.
4. The electric energy measuring apparatus according to claim 2 or 3,
the control unit is configured to:
and responding to the communication state of the mutual inductance type current sampling interface and the electric energy metering unit, wherein the electric energy metering unit does not sample current metering data, and prompt information for manually configuring the current sampling interface is generated.
5. The electrical energy measurement device of claim 2,
the electric energy measuring device further includes:
the voltage sampling interface is used for coupling the power transmission line;
the electric energy metering unit is configured to sample an input voltage signal through the voltage sampling interface to obtain voltage metering data;
the control unit is configured to acquire the voltage metering data of the electric energy metering unit.
6. The electrical energy measurement device of claim 5,
the control unit is configured to:
and determining a corresponding current phase angle according to the current metering data, determining a corresponding voltage phase angle according to the voltage metering data, and determining a corresponding first wiring mode according to the current phase angle and the voltage phase angle, wherein the first wiring mode comprises a three-phase three-wire mode and a three-phase four-wire mode.
7. The electrical energy measurement device of claim 5,
the control unit is configured to:
and determining a corresponding second wiring mode according to the current metering data and the voltage metering data, wherein the second wiring mode comprises a straight-through mode, a current mutual inductance mode and a current/voltage mutual inductance mode.
8. The electrical energy measurement device of claim 7,
the control unit is configured to:
when the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold value and the current value corresponding to the current metering data is smaller than the reference current threshold value, determining that the corresponding second connection mode is a straight-through mode; or
When the voltage value corresponding to the voltage metering data is smaller than the reference voltage threshold value and the current value corresponding to the current metering data is larger than the reference current threshold value, determining that the corresponding second wiring mode is a current mutual inductance mode; or
And when the voltage value corresponding to the voltage metering data is larger than the reference voltage threshold value and the current value corresponding to the current metering data is larger than the reference current threshold value, determining that the corresponding second connection mode is a current/voltage mutual inductance mode.
9. The electrical energy measurement device of claim 2,
the at least two power supply terminals comprise energy storage power supply terminals;
the electric energy measuring device further comprises a communication unit, wherein the communication unit is coupled with the control unit and is configured to communicate with the energy storage power supply terminal to obtain power supply data of the energy storage power supply terminal and send the power supply data to the control unit.
10. A power supply system, characterized in that the power supply system comprises:
a power supply terminal;
the power transmission line is coupled with the power supply end and a load so that the power supply end supplies power to the load;
the electric energy measuring device is coupled with the power transmission line; wherein the electrical energy measurement device is an electrical energy measurement device as claimed in any one of claims 1 to 9.
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| CN202211377094.5A CN115420942A (en) | 2022-11-04 | 2022-11-04 | Electric energy measuring device and power supply system |
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| CN202211377094.5A CN115420942A (en) | 2022-11-04 | 2022-11-04 | Electric energy measuring device and power supply system |
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Application publication date: 20221202 |