CN211236060U - Power quality monitoring circuit and power quality monitoring device - Google Patents
Power quality monitoring circuit and power quality monitoring device Download PDFInfo
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- CN211236060U CN211236060U CN201921837257.7U CN201921837257U CN211236060U CN 211236060 U CN211236060 U CN 211236060U CN 201921837257 U CN201921837257 U CN 201921837257U CN 211236060 U CN211236060 U CN 211236060U
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Abstract
The utility model discloses a power quality monitoring circuit and a power quality monitoring device, wherein the power quality monitoring circuit comprises a signal acquisition circuit, a signal processing circuit, a field programmable gate array, a central processing unit and an upper computer; the input end of the signal acquisition circuit is connected with the output end of an external alternating current power supply, and the output end of the signal acquisition circuit is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the first end of the field programmable gate array, and the second end of the field programmable gate array is connected with the first end of the central processing unit; and the second end of the central processing unit is connected with the upper computer. The technical scheme of the utility model, can improve electric energy quality monitoring devices's analysis computing power.
Description
Technical Field
The utility model relates to an electric energy monitoring field, in particular to electric energy quality monitoring circuit and electric energy quality monitoring device.
Background
At present, the electric energy quality monitoring device mainly adopts a RAM + DSP combined mode to collect, analyze and calculate the electric quantity. However, since the analysis capability and the calculation capability of the RAM + DSP are limited, the acquisition, analysis and calculation capability of the RAM + DSP is obviously insufficient once multi-channel sampling is required.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric energy quality monitoring circuit and electric energy quality monitoring device aims at improving electric energy quality monitoring device's collection ability, analytical ability and computing power to satisfy the demand of multichannel sampling.
In order to achieve the above object, the present invention provides a power quality monitoring circuit, which comprises a signal acquisition circuit, a signal processing circuit, a field programmable gate array, a central processing unit and an upper computer;
the input end of the signal acquisition circuit is connected with the output end of an external alternating current power supply, and the output end of the signal acquisition circuit is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the first end of the field programmable gate array, and the second end of the field programmable gate array is connected with the first end of the central processing unit; the second end of the central processing unit is connected with the upper computer;
the signal acquisition circuit is used for acquiring analog electric signals output by the alternating current power supply, adjusting the acquired analog electric signals according to a preset proportion and outputting the adjusted analog electric signals to the signal processing circuit;
the signal processing circuit is used for converting the adjusted analog electric signal into a digital electric signal and outputting the digital electric signal to the field programmable gate array;
the field programmable gate array is used for sampling the digital electric signal and outputting the sampled electric signal to the central processing unit;
and the central processing unit is used for transmitting the sampling electric signal to the upper computer.
Optionally, the signal acquisition circuit includes a voltage transformer and a current transformer, and the input end of the signal processing circuit includes a first input end and a second input end;
the input end of the voltage transformer is connected with the output end of the alternating current power supply, and the output end of the voltage transformer is connected with the first input end of the signal processing circuit;
the input end of the current transformer is connected with the output end of the alternating current power supply, and the output end of the current transformer is connected with the second input end of the signal processing circuit.
Optionally, the signal processing circuit is an a/D conversion circuit.
Optionally, the central processing unit is a 4-core central processing unit or an 8-core central processing unit.
Optionally, the power quality monitoring circuit further includes an open-in open-out circuit and an alarm device, and the field programmable gate array is connected to the alarm device through the open-in open-out circuit.
Optionally, the power quality monitoring circuit further includes a B-code time-setting circuit, and an output end of the B-code time-setting circuit is connected to a third end of the field programmable gate array.
Optionally, the power quality monitoring circuit further comprises an RS485 communication module, and the central processing unit is connected with the background system through the RS485 communication module.
Optionally, the power quality monitoring circuit further includes a wireless communication module, and the central processing unit is connected to the background system through the wireless communication module.
Optionally, the power quality monitoring circuit further includes a photoelectric acquisition circuit, an input end of the photoelectric acquisition circuit is connected to an output end of the ac power supply, and an output end of the photoelectric acquisition circuit is connected to the fourth end of the field programmable gate array.
In order to achieve the above object, the utility model also provides an electric energy quality monitoring device, electric energy quality monitoring device includes as above arbitrary the electric energy quality monitoring circuit.
The technical scheme of the utility model, through voltage signal and the current signal in the signal acquisition circuit collection electric wire netting to voltage signal and the current signal conversion that signal processing circuit gathered signal acquisition circuit become voltage signal and the current signal that FPGA can discern. After the FPGA samples the voltage signal and the current signal output by the signal processing circuit, the sampled electrical signal is transmitted to a central processing unit for analysis and processing. And the central processing unit analyzes and processes the received sampling electric signal to obtain electric energy quality data, and uploads the electric energy quality data to the upper computer for display. According to the arrangement, a user can visually check the trend information and the abnormal condition of the power quality data, the electric signals of the power grid are analyzed and processed in a mode of combining the FPGA with the central processing unit, the data analysis and calculation capacity of the power quality monitoring device can be improved, and the performance of the whole power quality monitoring device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of an embodiment of the power quality monitoring circuit of the present invention;
fig. 2 is a block diagram of another embodiment of the power quality monitoring circuit of the present invention;
fig. 3 is a block diagram of another embodiment of the power quality monitoring circuit of the present invention.
The reference numbers illustrate:
| 10 | |
20 | |
| 30 | |
40 | Field |
| 50 | |
60 | |
| 70 | Open-in and open-out circuit | 80 | Alarm device |
| 90 | B code |
100 | RS485 |
| 110 | |
120 | |
| 201 | |
202 | Current transformer |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a block diagram of an embodiment of the power quality monitoring circuit of the present invention.
The power quality monitoring circuit comprises a signal acquisition circuit 20, a signal processing circuit 30, a field programmable gate array 40, a central processing unit 50 and an upper computer 60;
the input end of the signal acquisition circuit 20 is connected with the output end of the external alternating current power supply 10, and the output end of the signal acquisition circuit 20 is connected with the input end of the signal processing circuit 30; the output end of the signal processing circuit 30 is connected to the first end of the field programmable gate array 40, and the second end of the field programmable gate array 40 is connected to the first end of the central processing unit 50; the second end of the central processing unit 50 is connected to the upper computer 60.
The signal collecting circuit 20 is configured to collect an analog electrical signal in the power grid, where the analog electrical signal includes an analog voltage signal and an analog current signal in the power grid, and output the collected analog electrical signal to the signal processing circuit 30 after being adjusted according to a preset ratio, for example, after being reduced according to the preset ratio. That is, the analog electrical signal in the power grid is adjusted to the analog electrical signal that can be recognized by the signal processing circuit 30, and then output to the signal processing circuit 30. The signal acquisition circuit 30 may be a PT/CT mutual inductance circuit, or other realizable circuits, and is not limited herein.
The signal processing circuit 30 is configured to convert the analog electrical signal output by the signal acquisition circuit 20 into a digital electrical signal and output the digital electrical signal to the field programmable gate array 40; the signal processing circuit 30 may be an a/D conversion circuit, for example, an AD conversion circuit formed of an AD7606 (anti-aliasing filter), and has a function of multi-channel synchronous sampling.
The field programmable gate array 40, i.e., an FPGA, is used for controlling the signal processing circuit 30 to perform high-speed signal acquisition, performing sampling processing on the digital electrical signal output by the signal processing circuit 30, and outputting the sampled electrical signal obtained by sampling to the central processing unit 50.
The cpu 50 has powerful data processing capability and logic control capability, and may be selected as a high-performance multi-core cpu, such as a 4-core cpu or an 8-core cpu. The central processing unit 50 is configured to analyze and process the electrical signal output by the field programmable gate array 40 to obtain power quality data, and transmit the obtained power quality data to the upper computer 60; the power quality monitoring circuit further includes a power supply, a hard disk, and a clock circuit connected to the central processing unit 50. The power supply is used for supplying power to the central processing unit 50, and the hard disk is used for storing data for the central processing unit 50.
The upper computer 60 is used for receiving and displaying the electric energy quality data uploaded by the central processing unit 50 so as to be analyzed and processed by workers, and the workers can issue control commands to the central processing unit 50 through the upper computer 60. The upper computer 60 may be composed of a RAM, a FLASH, a CPU, and a display screen, which may include an LCD display screen, an LED display screen, and the like.
Specifically, in the present embodiment, the signal acquisition circuit 20 acquires an analog electrical signal in the power grid, and the signal processing circuit 30 converts the analog electrical signal acquired by the signal acquisition circuit 20 into a digital electrical signal and outputs the digital electrical signal to the field programmable gate array 40. The field programmable gate array 40 performs sampling processing on the digital electrical signal output by the signal processing circuit 30, and transmits the sampled electrical signal obtained after the sampling processing to the central processing unit 50 through a preset communication mode, for example, a PHY communication mode. In this embodiment, a processing task may be allocated to each core according to the number of cores of the central processing unit 50, for example, the central processing unit 50 is set to be a 4-core central processing unit, and one core of the central processing unit 50 may be set to receive the sampling electrical signal output by the FPGA and store the sampling electrical signal in a preset storage device, for example, a hard disk; the other two cores of the central processing unit 50 are used for data analysis and calculation; the last core of the central processor 50 is used for communication transmission. After receiving the sampled electrical signal output by the FPGA, the central processor 50 obtains power quality data through analysis and calculation, where the power quality data includes steady-state data and transient-state data, and the steady-state data includes an effective value of voltage, an effective value of current, active power, reactive power, apparent power, and power factors; fundamental active, reactive, apparent power, power factor, fundamental phase angle, etc.; transient data includes voltage ramp-up data, voltage ramp-down data, short-time voltage interruption data, inrush current data, and the like. The central processing unit 50 uploads the analyzed power quality data to the upper computer 60 in a PHY communication mode or a wireless communication mode, so that the staff can analyze and process the data. Or uploaded to the background system through the RS485 communication module 100 and the wireless communication module 110, so as to be analyzed online by the background system.
According to the technical scheme of the embodiment, the signal acquisition circuit 20 is used for acquiring voltage signals and current signals in a power grid, and the signal processing circuit 30 is used for converting the voltage signals and the current signals acquired by the signal acquisition circuit 20 into the voltage signals and the current signals which can be identified by the FPGA. After the voltage signal and the current signal output by the signal processing circuit 30 are sampled by the FPGA, the sampled electrical signals are transmitted to the central processing unit 50 for analysis and processing. The central processing unit 50 analyzes and processes the received sampling electric signal to obtain power quality data, and uploads the power quality data to the upper computer 60 for display. So set up for the trend information and the abnormal conditions that the user can directly perceivedly look over the electric energy data, and adopt the mode that FPGA and central processing unit 50 combined together to carry out analysis processes to the signal of telecommunication of electric wire netting, can improve electric energy quality monitoring devices to the analysis, the computing power of data, improve whole electric energy quality monitoring devices's performance.
In an embodiment, referring to fig. 2, the signal acquisition circuit includes a voltage transformer 201 and a current transformer 202, and the input terminal of the signal processing circuit 30 includes a first input terminal and a second input terminal;
the input end of the voltage transformer 201 is connected with the output end of the alternating current power supply 10, and the output end of the voltage transformer 201 is connected with the first input end of the signal processing circuit 30;
the input end of the current transformer 202 is connected to the output end of the ac power supply 10, and the output end of the current transformer 202 is connected to the second input end of the signal processing circuit 30.
In this embodiment, the voltage transformer 201 is used to collect an analog voltage signal in the power grid, and adjust the collected analog voltage signal according to a preset ratio to an analog voltage signal that can be recognized by the signal processing circuit 30 and output the analog voltage signal to the signal processing circuit 30.
Meanwhile, the current transformer 202 collects an analog current signal in the power grid, adjusts the collected analog current signal according to a preset proportion, adjusts the analog current signal to an analog current signal which can be identified by the signal processing circuit 30, and outputs the analog current signal to the signal processing circuit 30.
In one embodiment, the signal processing circuit 30 is an a/D conversion circuit, which may include an AD7606 chip, and the AD7606 chip converts the analog voltage signal and the analog current signal into a digital voltage signal and a digital current signal that can be recognized by the FPGA.
In an embodiment, the power quality monitoring circuit further includes an open-close circuit 70 and an alarm device 80, and the field programmable gate array 40 is connected to the alarm device 80 through the open-close circuit 70.
The open-close circuit 70 is used for transmitting the open-close amount output by the field programmable gate array 40 to the alarm device 80. The alarm device 80 may be a relay, an LED lamp, a buzzer, or the like. That is to say, according to the technical solution of this embodiment, the field programmable gate array 40 may be connected to the alarm device 80 through the open-close circuit 70, and when the power quality data is abnormal, an alarm prompt may be sent through the alarm device 80. The open-in and open-out circuit 70 is further configured to transmit the analog quantity accessed by the external circuit to the field programmable gate array 40, so that the field programmable gate array 40 executes a corresponding operation.
In an embodiment, the power quality monitoring circuit further includes a B-code time-setting circuit 90, and an output end of the B-code time-setting circuit 90 is connected to a third end of the field programmable gate array.
The B code time tick circuit is used for receiving clock source signals of an external GPS module and a Beidou module so as to ensure synchronous sampling of the device and ensure that all recorded data have absolute time stamps. That is, the B-code time synchronization circuit 90 makes the power quality data uploaded to the upper computer 60 or the background system have an absolute time scale, so as to improve the accuracy of the data.
In an embodiment, the power quality monitoring circuit further includes an RS485 communication module 100, and the central processing unit 50 is connected to the background system through the RS485 communication module 100.
Specifically, the RS485 communication module 100 is configured to implement communication connection between the central processing unit 50 and the background system, so that the central processing unit 50 uploads the power quality data to the background system.
In an embodiment, the power quality monitoring circuit further includes a wireless communication module 110, and the central processing unit 50 is connected to the background system through the wireless communication module 110.
In this embodiment, the wireless communication module 110 includes, but is not limited to, a bluetooth module, a WI-FI module, and a Zigbee module. The wireless communication module 110 is configured to implement communication connection and data transmission between the central processing unit 50 and the background system.
In an embodiment, referring to fig. 3, the power quality monitoring circuit further includes a photoelectric acquisition circuit 120, an input end of the photoelectric acquisition circuit 120 is connected to an output end of the ac power supply 10, and an output end of the photoelectric acquisition circuit 120 is connected to the fourth end of the field programmable gate array 40.
The photoelectric acquisition circuit 120 is configured to acquire a voltage signal and a current signal in a power grid, and output a digital voltage signal and a digital current signal to the field programmable gate array 40, so that the field programmable gate array 40 performs corresponding operations, for example, the field programmable gate array 40 performs sampling processing on the digital voltage signal and the digital current signal, and transmits the sampled electrical signal obtained after the sampling processing to the central processing unit 50 in a PHY communication manner.
The utility model also provides an electric energy quality monitoring devices, electric energy quality monitoring devices includes as above electric energy quality monitoring circuit. The detailed structure of the power quality monitoring circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses above-mentioned power quality monitoring circuit has been used among the power quality monitoring device, consequently, the utility model discloses power quality monitoring device's embodiment includes all technical scheme of the whole embodiments of above-mentioned power quality monitoring circuit, and the technical effect who reaches is also identical, no longer gives details here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. The electric energy quality monitoring circuit is characterized by comprising a signal acquisition circuit, a signal processing circuit, a field programmable gate array, a central processing unit and an upper computer;
the input end of the signal acquisition circuit is connected with the output end of an external alternating current power supply, and the output end of the signal acquisition circuit is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the first end of the field programmable gate array, and the second end of the field programmable gate array is connected with the first end of the central processing unit; the second end of the central processing unit is connected with the upper computer;
the signal acquisition circuit is used for acquiring analog electric signals output by the alternating current power supply, adjusting the acquired analog electric signals according to a preset proportion and outputting the adjusted analog electric signals to the signal processing circuit;
the signal processing circuit is used for converting the adjusted analog electric signal into a digital electric signal and outputting the digital electric signal to the field programmable gate array;
the field programmable gate array is used for sampling the digital electric signal and outputting the sampled electric signal to the central processing unit;
and the central processing unit is used for transmitting the sampling electric signal to the upper computer.
2. The power quality monitoring circuit of claim 1, wherein the signal acquisition circuit comprises a voltage transformer and a current transformer, and the input of the signal processing circuit comprises a first input and a second input;
the input end of the voltage transformer is connected with the output end of the alternating current power supply, and the output end of the voltage transformer is connected with the first input end of the signal processing circuit;
the input end of the current transformer is connected with the output end of the alternating current power supply, and the output end of the current transformer is connected with the second input end of the signal processing circuit.
3. The power quality monitoring circuit of claim 1 wherein the signal processing circuit is an a/D conversion circuit.
4. The power quality monitoring circuit of claim 1, wherein the central processing unit is a 4-core central processing unit or an 8-core central processing unit.
5. The power quality monitoring circuit according to any one of claims 1 to 4, wherein the power quality monitoring circuit further comprises an open-open circuit and an alarm device, and the field programmable gate array is connected with the alarm device through the open-open circuit.
6. The power quality monitoring circuit according to claim 5, wherein the power quality monitoring circuit further comprises a B-code time-setting circuit, and an output end of the B-code time-setting circuit is connected with a third end of the field programmable gate array.
7. The power quality monitoring circuit according to claim 6, wherein the power quality monitoring circuit further comprises an RS485 communication module, and the central processor is connected with a background system through the RS485 communication module.
8. The power quality monitoring circuit according to claim 7, wherein the power quality monitoring circuit further comprises a wireless communication module, and the central processing unit is connected with the background system through the wireless communication module.
9. The power quality monitoring circuit according to claim 1, further comprising a photo-electric acquisition circuit, an input terminal of the photo-electric acquisition circuit being connected to an output terminal of the ac power supply, an output terminal of the photo-electric acquisition circuit being connected to the fourth terminal of the field programmable gate array.
10. A power quality monitoring device characterized by comprising the power quality monitoring circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837257.7U CN211236060U (en) | 2019-10-25 | 2019-10-25 | Power quality monitoring circuit and power quality monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837257.7U CN211236060U (en) | 2019-10-25 | 2019-10-25 | Power quality monitoring circuit and power quality monitoring device |
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| Publication Number | Publication Date |
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| CN211236060U true CN211236060U (en) | 2020-08-11 |
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| CN201921837257.7U Active CN211236060U (en) | 2019-10-25 | 2019-10-25 | Power quality monitoring circuit and power quality monitoring device |
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| CN (1) | CN211236060U (en) |
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- 2019-10-25 CN CN201921837257.7U patent/CN211236060U/en active Active
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