CN112904136A - Electric energy quality monitoring device - Google Patents
Electric energy quality monitoring device Download PDFInfo
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- CN112904136A CN112904136A CN202110252067.4A CN202110252067A CN112904136A CN 112904136 A CN112904136 A CN 112904136A CN 202110252067 A CN202110252067 A CN 202110252067A CN 112904136 A CN112904136 A CN 112904136A
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- 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
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
本申请属于电能质量监测设计技术领域，具体涉及一种电能质量监测装置，包括：AD转换芯片；开口式电流互感器，用以采集电流信号；电流采集电阻，与开口式电流互感器并联接入AD转换芯片；AD转换芯片对电流信号进行暂态模数转换；CPU，与AD转换芯片连接，基于暂态模数转换后的电流信号计算得到相应的暂态电能质量数据。
The present application belongs to the technical field of power quality monitoring design, and in particular relates to a power quality monitoring device, comprising: an AD conversion chip; an open current transformer used to collect current signals; a current acquisition resistor connected in parallel with the open current transformer AD conversion chip; the AD conversion chip performs transient analog-to-digital conversion on the current signal; the CPU, connected to the AD conversion chip, calculates corresponding transient power quality data based on the current signal after the transient analog-to-digital conversion.
Description
Technical Field
The application belongs to the technical field of power quality monitoring design, and particularly relates to a power quality monitoring device.
Background
The monitoring of the power quality is the basis and the premise for controlling and governing the power quality problem, the existing power quality monitoring device can well monitor the steady-state power quality, such as the effective value of current voltage, frequency deviation, voltage deviation, three-phase imbalance, harmonic, power, overcurrent, overvoltage and the like, but can not be well applied to monitoring the transient power quality, such as voltage sag, voltage interruption, pulse transient, oscillation transient, voltage gap and the like.
At present, the transient electric energy quality is monitored mainly by adopting a mode of serially connecting bus current transformers or by means of instruments such as a wave recorder and an oscilloscope, wherein:
the transient power quality is monitored by adopting a mode of connecting a bus current transformer in series, and secondary loop sampling of the current transformer is required twice, as shown in fig. 1, and the reliability of sampling data is low;
the transient power quality monitoring is realized by means of instruments such as a wave recorder, an oscilloscope and the like, and a Rogowski coil, an integrating circuit and the like are required to be additionally arranged, so that as shown in FIG. 2, the requirement on the coil precision is extremely high, the manufacturing cost is high, and the popularization and application are difficult;
the present application has been made in view of the above-mentioned technical drawbacks.
It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present application.
Disclosure of Invention
It is an object of the present application to provide a power quality monitoring apparatus that overcomes or mitigates at least one aspect of the technical disadvantages known to exist.
The technical scheme of the application is as follows:
an electrical energy quality monitoring device comprising:
an AD conversion chip;
the open type current transformer is used for collecting current signals;
the current acquisition resistor is connected with the open type current transformer in parallel and is connected to the AD conversion chip; the AD conversion chip performs transient analog-to-digital conversion on the current signal;
and the CPU is connected with the AD conversion chip and calculates to obtain corresponding transient electric energy quality data based on the current signal after the transient analog-to-digital conversion.
According to at least one embodiment of the present application, in the above power quality monitoring apparatus, there are a plurality of open-type current transformers and corresponding current collection resistors.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
the voltage acquisition circuit is used for acquiring voltage signals and accessing the voltage signals to the AD conversion chip;
the AD conversion chip performs transient analog-to-digital conversion on the voltage signal;
and the CPU calculates to obtain corresponding transient electric energy quality data based on the voltage signal after the transient analog-to-digital conversion.
According to at least one embodiment of the present application, in the above power quality monitoring apparatus, there are a plurality of voltage acquisition circuits.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
the singlechip is connected with the AD conversion chip in parallel and used for performing steady-state analog-to-digital conversion on the current signal;
and the CPU calculates and obtains corresponding steady-state power quality data based on the current signal after steady-state analog-to-digital conversion.
According to at least one embodiment of the application, in the electric energy quality monitoring device, the voltage acquisition circuit is connected to the single chip microcomputer;
the single chip microcomputer performs steady-state analog-to-digital conversion on the voltage signal;
and the CPU calculates and obtains corresponding steady-state power quality data based on the voltage signal after steady-state analog-to-digital conversion.
According to at least one embodiment of the present application, in the above power quality monitoring device, there are multiple sets of the AD conversion chip and the open type current transformer, the current collection resistor, the voltage collection circuit, and the single chip microcomputer corresponding to the AD conversion chip.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
the 5G communication module is connected with the CPU;
and the remote server is connected with the 5G communication module through a 5G signal so as to be capable of receiving the current signal after the transient analog-to-digital conversion, and corresponding transient electric energy quality data is obtained by calculation based on the current signal after the transient analog-to-digital conversion.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
and the local interaction terminal is connected with the CPU so as to display the data obtained by the calculation of the CPU and configure the related parameters of the 5G communication module.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
and the synchronous time setting module is connected with the CPU and provides an accurate clock, so that basic time record is given to the current signal after the transient analog-to-digital conversion.
According to at least one embodiment of the present application, the above power quality monitoring apparatus further includes:
and the power management module is connected with the CPU and used for carrying out power management on the electric energy quality monitoring device.
Drawings
FIG. 1 is a schematic diagram of a conventional method for monitoring transient power quality by using a serial bus current transformer;
FIG. 2 is a schematic diagram of a conventional method for monitoring transient power quality by means of an auxiliary oscillograph, an oscilloscope, or the like;
fig. 3 is a schematic diagram of a power quality monitoring apparatus provided by an embodiment of the present application;
fig. 4 is a partial schematic view of a power quality monitoring device provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of a power management module circuit provided in an embodiment of the present application;
FIG. 6 is a schematic diagram of a USB communication circuit according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another portion of a power quality monitoring apparatus provided by an embodiment of the present application;
wherein:
1-AD conversion chip; 2-open type current transformer; 3, a singlechip; 4-a CPU; 5-5G communication module; 6-a remote server; 7-local interaction end; 8-synchronous time synchronization module; 9-a power management module; 10-a metal heat sink; 11-a metal heat sink;
r5-current collection resistance.
For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general designs, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.
In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The word "comprising" or "comprises", and the like, when used in this description, is intended to specify the presence of stated elements or items, but not the exclusion of other elements or items.
Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.
The present application is described in further detail below with reference to fig. 1 to 6.
An electrical energy quality monitoring device comprising:
an AD conversion chip 1;
the open type current transformer 2 is used for collecting current signals;
the current acquisition resistor R5 is connected with the open type current transformer 2 in parallel and connected to the AD conversion chip 1; the AD conversion chip 1 performs transient analog-to-digital conversion on the current signal;
and the CPU4 is connected with the AD conversion chip 1, and calculates corresponding transient electric energy quality data based on the current signal after the transient analog-to-digital conversion.
For the power quality monitoring device disclosed in the above embodiment, those skilled in the art can understand that the current collection resistor R5 is designed to be connected in parallel with the open-type current transformer 2, and the current collection resistor R5 is designed to make the current flowing through the current collection resistor R5 milliampere, and two ends of the current collection resistor R5 can generate a minute voltage, which can be collected by the AD conversion chip 1, and after the AD conversion chip 1 performs transient analog-to-digital conversion on the voltage, the voltage is transmitted to the CPU4 to obtain corresponding transient power quality data through calculation, so as to monitor the transient power quality.
For the power quality monitoring device disclosed in the above embodiment, it can be further understood by those skilled in the art that the current signal is acquired by acquiring the voltage at the two ends of the current acquisition resistor R5, which is connected in parallel with the open-type current transformer 2, by the AD conversion chip 1, and the acquisition is performed for the first-stage acquisition, which has higher accuracy, is simple to set, and is easy to implement.
In some optional embodiments, in the above power quality monitoring apparatus, there are a plurality of open-type current transformers 2 and corresponding current collecting resistors R5.
For the power quality monitoring device disclosed in the above embodiments, it can be understood by those skilled in the art that the open-type current transformer 2 and the corresponding current collecting resistor R5 are designed to have a plurality of circuits for synchronously collecting current signals.
In some optional embodiments, in the above power quality monitoring apparatus, the model of the AD conversion chip 1 may be selected to be MCP3914, and the AD conversion chip 1 is connected to the CPU4 through an SPI communication bus, and in addition, a general noise reduction circuit may be connected between the current collection resistor R5 and the AD conversion chip 1 in order to reduce noise, as shown in fig. 4.
In some optional embodiments, the above power quality monitoring apparatus further includes:
the voltage acquisition circuit is used for acquiring voltage signals and accessing the AD conversion chip 1;
the AD conversion chip 1 performs transient analog-to-digital conversion on the voltage signal;
the CPU4 calculates the corresponding transient power quality data based on the voltage signal after the transient analog-to-digital conversion.
For the power quality monitoring device disclosed in the above embodiment, those skilled in the art can understand that the voltage acquisition circuit is designed to be connected to the AD conversion chip 1, and the voltage signal acquired by the voltage acquisition circuit in the AD conversion chip 1 is subjected to transient analog-to-digital conversion, and is transmitted to the CPU4 to obtain corresponding transient power quality data through calculation, so as to monitor the transient power quality.
In some optional embodiments, in the above power quality monitoring apparatus, there are a plurality of voltage acquisition circuits.
For the power quality monitoring device disclosed in the above embodiments, it can be understood by those skilled in the art that a plurality of voltage acquisition circuits are designed, so that multi-channel synchronous acquisition of voltage signals can be realized.
In some optional embodiments, the above power quality monitoring apparatus further includes:
the singlechip 3 is connected with the AD conversion chip 1 in parallel and performs steady-state analog-to-digital conversion on the current signal;
the CPU4 calculates corresponding steady state power quality data based on the steady state analog to digital converted current signal.
For the power quality monitoring device disclosed in the above embodiment, those skilled in the art can understand that the single chip 3 and the AD conversion chip 1 are designed, and the voltages at the two ends of the resistor R5 can be collected, and after performing steady-state analog-to-digital conversion on the voltages, the voltages are transmitted to the CPU4 to obtain corresponding steady-state power quality data through calculation, so as to monitor the steady-state power quality.
In some optional embodiments, in the above power quality monitoring device, the voltage acquisition circuit is connected to the single chip microcomputer 3;
the singlechip 3 performs steady-state analog-to-digital conversion on the voltage signal;
the CPU4 calculates corresponding steady state power quality data based on the steady state analog to digital converted voltage signal.
For the power quality monitoring device disclosed in the above embodiment, it can be understood by those skilled in the art that the voltage acquisition circuit is connected to the single chip microcomputer 3, and the voltage signal acquired by the voltage acquisition circuit in the single chip microcomputer 3 is subjected to steady-state analog-to-digital conversion, and is transmitted to the CPU4 to obtain corresponding steady-state power quality data through calculation, so as to monitor the steady-state power quality.
In some optional embodiments, in the above power quality monitoring device, there are multiple groups of the AD conversion chip 1 and the open type current transformer 2, the current collecting resistor R5, the voltage collecting circuit, and the single chip microcomputer 3 corresponding thereto.
In some optional embodiments, the above power quality monitoring apparatus further includes:
the 5G communication module 5 is connected with the CPU 4;
and the remote server 6 is connected with the 5G communication module 5 through a 5G signal so as to be capable of receiving the current signal after the transient analog-to-digital conversion, and calculating to obtain corresponding transient electric energy quality data based on the current signal after the transient analog-to-digital conversion.
For the power quality monitoring device disclosed in the above embodiment, those skilled in the art can understand that the remote server 6 and the CPU4 are designed to perform 5G communication through the 5G communication module 5, so that the time delay is relatively small, and in addition, after the remote server 6 receives the current signal after the transient analog-to-digital conversion, the current signal after the transient analog-to-digital conversion is calculated to obtain corresponding transient power quality data, so that the real-time performance of remote monitoring can be ensured.
In some optional embodiments, the above power quality monitoring apparatus further includes:
and the local interaction terminal 7 is connected with the CPU4 so as to display the data calculated by the CPU4 and configure relevant parameters of the 5G communication module 5.
In some optional embodiments, the above power quality monitoring apparatus further includes:
the synchronous time setting module 8 is connected with the CPU4, and provides an accurate clock, so as to provide a basic time record for the current signal after the transient analog-to-digital conversion.
In some optional embodiments, the above power quality monitoring apparatus further includes:
the power management module 9 is connected to the CPU4 to perform power management on the power quality monitoring device, and its related circuits are shown in fig. 5.
In some optional embodiments, the power quality monitoring device is designed with a USB communication circuit as shown in fig. 6.
In some optional embodiments, the above power quality monitoring apparatus further includes:
a metal heat dissipation plate 10, one side wall surface of which is provided with a clamping groove; the CPU4 is snapped into the card slot;
and a plurality of metal heat sinks 11 connected to the other side wall surface of the metal heat sink 10 and arranged in a zigzag shape.
With regard to the power quality monitoring device disclosed in the above embodiments, it can be understood by those skilled in the art that the CPU4 generates a large amount of heat when working, and the CPU4 is cooled in a manner that the metal cooling plate 10 and the metal cooling fins 11 are matched, so that the device is not easily damaged, thereby reducing the failure rate of the device, and in addition, the metal cooling fins 11 are designed to be arranged on the wall surface of the metal cooling plate 10 on the side opposite to the CPU2 in a zigzag manner, so that a good cooling effect can be obtained.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The embodiments in the specification are described in a progressive mode, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It should be noted that, for clarity and simplicity of representation, all the components of the power quality monitoring device are not shown in the foregoing embodiments, and in order to implement the necessary functions of the power quality monitoring system, a person skilled in the art may provide and set other components not shown according to specific needs.
Furthermore, those skilled in the art should also realize that the various modules, units, and units of the power quality monitoring apparatus disclosed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both, and for the purpose of clearly illustrating the interchangeability of hardware and software, the functions described herein are generally described in terms of whether they are implemented by hardware or software, and that those skilled in the art can choose different methods to implement the described functions for each particular application and its practical constraints, depending on the particular application and design constraints of the technical solution, but such implementation should not be considered as exceeding the scope of the present application.
Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.
Claims (10)
1. An electrical energy quality monitoring device, comprising:
an AD conversion chip (1);
the open type current transformer (2) is used for collecting current signals;
the current acquisition resistor (R5) is connected with the open type current transformer (2) in parallel and connected to the AD conversion chip (1); the AD conversion chip (1) performs transient analog-to-digital conversion on the current signal;
and the CPU (4) is connected with the AD conversion chip (1) and calculates to obtain corresponding transient electric energy quality data based on the current signal after the transient analog-to-digital conversion.
2. The power quality monitoring device of claim 1,
the open type current transformer (2) and the corresponding current collecting resistors (R5) are multiple.
3. The power quality monitoring device of claim 1,
further comprising:
the voltage acquisition circuit is used for acquiring voltage signals and accessing the AD conversion chip (1);
the AD conversion chip (1) performs transient analog-to-digital conversion on the voltage signal;
and the CPU (4) calculates to obtain corresponding transient electric energy quality data based on the voltage signal after the transient analog-to-digital conversion.
4. The power quality monitoring device of claim 3,
the voltage acquisition circuit has a plurality of.
5. The power quality monitoring device of claim 3,
further comprising:
the single chip microcomputer (3) is connected with the AD conversion chip (1) in parallel and used for performing steady-state analog-to-digital conversion on the current signal;
and the CPU (4) calculates and obtains corresponding steady-state power quality data based on the current signal after steady-state analog-to-digital conversion.
6. The power quality monitoring device of claim 3,
the voltage acquisition circuit is connected to the single chip microcomputer (3);
the single chip microcomputer (3) performs steady-state analog-to-digital conversion on the voltage signal;
and the CPU (4) calculates to obtain corresponding steady-state power quality data based on the voltage signal after steady-state analog-to-digital conversion.
7. The power quality monitoring device of claim 3, wherein the power quality monitoring device is a digital signal processing device
AD conversion chip (1) and its correspond open type current transformer (2) current acquisition resistance (R5), voltage acquisition circuit, singlechip (3) have the multiunit.
8. The power quality monitoring device of claim 1,
further comprising:
the 5G communication module (5) is connected with the CPU (4);
and the remote server (6) is connected with the 5G communication module (5) through a 5G signal so as to be capable of receiving the current signal after the transient analog-to-digital conversion, and corresponding transient electric energy quality data are obtained through calculation based on the current signal after the transient analog-to-digital conversion.
9. The power quality monitoring device of claim 8,
further comprising:
and the local interaction terminal (7) is connected with the CPU (4) and can display the data calculated by the CPU (4) and configure the related parameters of the 5G communication module (5).
10. The power quality monitoring device of claim 8,
further comprising:
and the synchronous time synchronization module (8) is connected with the CPU (4) and provides an accurate clock, so that a basic time record is given to the current signal after the transient analog-to-digital conversion.
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Application publication date: 20210604 |