CN213780220U - Electric energy quality monitoring device and capacitor comprehensive energy consumption measuring device - Google Patents
Electric energy quality monitoring device and capacitor comprehensive energy consumption measuring device Download PDFInfo
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- CN213780220U CN213780220U CN202021249079.9U CN202021249079U CN213780220U CN 213780220 U CN213780220 U CN 213780220U CN 202021249079 U CN202021249079 U CN 202021249079U CN 213780220 U CN213780220 U CN 213780220U
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 27
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Abstract
The utility model relates to an energy quality monitoring device and condenser comprehensive energy consumption measuring device, the utility model discloses a voltage that voltage transformer and current transformer gathered the electric wire netting, current signal, and through the conditioning circuit, transfer to AD sampling circuit and export to AD sampling circuit after the required scope of AD sampling circuit input, AD sampling circuit converts the analog signal who obtains into digital signal, and export to in ARM treater and the DSP treater, the DSP treater is handled the data received, obtain energy quality parameter and condenser energy consumption parameter, ARM treater is with each digital signal of AD converting circuit transmission, and the energy quality parameter and the condenser energy consumption parameter that obtain through the DSP treater output display show. The utility model discloses the condenser energy consumption that a plurality of electric energy quality indexes of quantitative analysis that can be quick, accurate lead to.
Description
Technical Field
The application belongs to the power equipment energy consumption monitoring field, and concretely relates to power quality monitoring device and capacitor comprehensive energy consumption measuring device.
Background
Energy conservation and loss reduction are one of the development directions of smart power grids, and a power capacitor is used as a main reactive power compensation device and applied to a power system in a large scale, and plays an important role in improving the stability of the power system, improving the quality of electric energy and reducing the loss of the power grid.
In recent years, with the wide application of power electronic equipment and inductive loads in a power distribution network, the problem of insufficient reactive power of a power grid system is increasingly highlighted, and in order to solve the problem, a reactive power compensation device is generally required to be installed. When the capacitor is used for reactive compensation, the investment is low, the capacitor is convenient to dispersedly install, the capacitor is well popularized and applied, and various compensation devices and compensation modes are more and more. Because the capacitors are applied more widely in power systems and even a little loss is accumulated greatly, energy-saving reconstruction, energy consumption reason analysis and the like of the capacitors are one of important measures for energy saving.
On the other hand, as loads in a power grid become more complex and diversified, electric energy quality phenomena such as harmonic waves, voltage deviation, unbalance and the like exist generally. Long-term research and analysis of power quality show that different power quality phenomena bring more or less additional energy consumption to electrical equipment (including a capacitor), for example, when harmonic current is superposed on fundamental current of the capacitor, the effective value of the operating current of the capacitor can be increased, and the additional heating loss of the capacitor is caused; when the reactive power balance in the system changes, the capacitor is overcompensated or undercompensated, so that the voltage in the system deviates from the rated voltage, the terminal voltage of the capacitor is influenced, and the active loss of the capacitor is further influenced; when the voltages at the phase ends of the three-phase capacitor bank are unbalanced, the loss of the capacitor is increased.
However, because the power quality and the energy conservation are two relatively independent fields, the application research of power quality data at home and abroad, particularly the research work of equipment energy consumption caused by poor power quality, is still in a starting stage at present, and stays at a qualitative analysis level, and no intuitive and accurate quantitative analysis method and device are researched. Therefore, the influence of the power quality on the comprehensive energy consumption of the capacitor cannot be calculated quantitatively in actual work, the direct economic benefit of power quality control cannot be evaluated, and the development of energy-saving work of power grid equipment is influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the problem of among the prior art electric energy quality influences the comprehensive energy consumption of condenser and is difficult to quantify is solved.
For solving the technical problem, the utility model provides an energy quality monitoring devices and condenser comprehensive energy consumption measuring device, based on power quality index data and condenser parameter, can be fast, the condenser energy consumption that a plurality of power quality indexes of accurate quantitative calculation lead to, solved the problem that the influence of present poor power quality to electric wire netting equipment energy consumption can't the quantitative calculation.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model discloses the first aspect provides an electric energy quality monitoring device, include: the system comprises a voltage transformer, a current transformer, a signal conditioning circuit, an A/D sampling circuit, an ARM processor, a DSP processor and a display;
the primary side of the voltage transformer is connected with a primary loop of a power grid, and the secondary side of the voltage transformer is connected with the input end of the signal conditioning circuit; the primary side of the current transformer is connected to a primary loop of a power grid, and the secondary side of the current transformer is connected to the input end of the signal conditioning circuit;
the output end of the signal conditioning circuit is connected to the analog input end of the A/D sampling circuit, the digital output end of the A/D sampling circuit is connected with the signal input ends of the DSP processor and the ARM processor, and the data input and output ends of the DSP processor and the ARM processor are connected;
the display is connected to the signal output end of the ARM processor and used for displaying the power quality parameters.
The utility model discloses the second aspect provides condenser comprehensive energy consumption measuring device, include the first aspect electric energy quality monitoring devices, still include analog input module, analog input module pass through the RS485 bus with the ARM treater is connected, the ARM treater is used for transmitting the condenser parameter of gathering through analog input module to the DSP treater.
The utility model discloses the beneficial effect who reaches: the utility model discloses based on electric energy quality index data and condenser parameter, the condenser energy consumption that a plurality of electric energy quality indexes of quantitative analysis that can be quick, accurate lead to.
The utility model discloses a man-machine interaction interface of device, the real-time is good.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
Fig. 1 is a schematic structural diagram of an electric energy quality monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal conditioning circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a follower circuit according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The utility model provides an electric energy quality monitoring device, as shown in figure 1, include: the system comprises a voltage transformer, a current transformer, a signal conditioning circuit, an A/D sampling circuit, an ARM processor, a DSP processor and a display;
the primary side of the voltage transformer is connected with a primary loop of a power grid, and the secondary side of the voltage transformer is connected with the input end of the signal conditioning circuit; the primary side of the current transformer is connected to a primary loop of a power grid, and the secondary side of the current transformer is connected to the input end of the signal conditioning circuit;
the output end of the signal conditioning circuit is connected to the analog input end of the A/D sampling circuit, the digital output end of the A/D sampling circuit is connected with the signal input ends of the DSP processor and the ARM processor, and the data input and output ends of the DSP processor and the ARM processor are connected;
the display is connected to the signal output end of the ARM processor and used for displaying the power quality parameters.
In this embodiment, the voltage transformer is configured to collect a voltage sampling signal in a power grid, convert a strong voltage signal of the collected power grid into a weak voltage signal, and output the weak voltage signal to the signal conditioning circuit. The current transformer is used for collecting current sampling signals in a power grid, converting collected power grid strong current signals into weak current signals and outputting the weak current signals to the signal conditioning circuit.
The signal conditioning circuit amplifies and offsets the weak voltage signal and the weak current signal output by the voltage transformer and the current transformer, adjusts the signals to the range required by the input of the A/D sampling circuit, and outputs the well-conditioned weak voltage signal and weak current signal to the A/D sampling circuit.
And the A/D sampling circuit converts the analog signals acquired from the signal conditioning circuit into digital signals and outputs the digital signals to an ARM (Advanced RISC Machines) processor and a DSP (digital signal processor).
The DSP is mainly used for receiving various digital signals transmitted by the A/D conversion circuit and processing the received data to obtain electric energy quality parameters such as harmonic voltage, harmonic current, flicker, fundamental voltage, voltage deviation and the like.
The ARM processor is used for outputting all digital signals transmitted by the A/D conversion circuit and electric energy quality parameters such as harmonic voltage, harmonic current, flicker, fundamental voltage, voltage deviation and the like obtained by the DSP processor to a display for displaying.
Optionally, as shown in fig. 2, the signal conditioning circuit includes a differential amplifier and a bias circuit, signal output ends of the voltage transformer and the current transformer are connected to a signal input end of the differential amplifier, a signal output end of the differential amplifier is connected to a signal input end of the bias circuit, and a signal output end of the bias circuit is connected to the ARM processor and the DSP processor.
In this embodiment, voltage or current signals in the power grid collected by the voltage transformer and the current transformer are amplified by the differential amplifier, so that noise is reduced and driving capability of the signals is improved. The voltage or current signal amplified by the differential amplifier is adjusted to the range required by the input of the A/D sampling circuit through the biasing circuit.
The signal conditioning circuit of this embodiment further includes a follower circuit, a signal output terminal of the bias circuit is connected to a signal input terminal of the follower circuit, and is connected to the ARM processor as a signal output terminal of the signal conditioning circuit, and a signal output terminal of the follower circuit is connected to the DSP signal processor as another signal output terminal of the signal conditioning circuit.
The voltage or current signal output by the bias circuit enters the ARM processor through one path, the other path enters the DSP processor through the following circuit, the following circuit can play a role in isolating two paths of AD sampling channels, and mutual interference caused by simultaneous sampling of the ARM processor and the DSP processor can be prevented.
As shown in fig. 3, the follower circuit of this embodiment includes an amplifier U, an inverting input terminal of the amplifier U and an output terminal of the amplifier U simultaneously serve as a signal output terminal of the follower circuit, and a non-inverting input terminal of the amplifier U serves as a signal input terminal of the follower circuit.
Optionally, one end of the primary side of the voltage transformer is connected to a first resistor, the other end of the primary side of the voltage transformer is connected to a second resistor, one end of the secondary side of the voltage transformer is connected to the signal conditioning circuit through one end connected to a third resistor, and the other end of the secondary side of the voltage transformer is grounded through the other end connected to the third resistor.
The display of the embodiment can adopt a touch display screen, and the AD conversion circuit can adopt but is not limited to an ADC0809 conversion chip.
Further optionally, the present embodiment is further provided with a memory, and the memory is connected to the signal output end of the ARM processor.
The memory is connected with the ARM processor to realize data bidirectional transmission and is used for storing the power quality parameters.
Further, a communication module can be further arranged in the embodiment, and the ARM processor can transmit the power quality parameter to a remote monitoring room through the communication module.
Example 2:
this embodiment provides an energy consumption measuring device is synthesized to condenser, include the utility model discloses embodiment 1 power quality monitoring devices, still include analog input module, analog input module pass through the RS485 bus with the ARM treater is connected, the ARM treater is used for transmitting the condenser parameter of gathering through analog input module to the DSP treater.
For the power quality monitoring apparatus, please refer to embodiment 1, which is not described herein again.
The DSP processor in this embodiment is mainly configured to receive and process each digital signal transmitted by the a/D conversion circuit to obtain power quality parameters such as three-phase harmonic voltage content, three-phase fundamental voltage, three-phase voltage deviation, and three-phase voltage, and calculate capacitor energy consumption and comprehensive energy consumption caused by harmonic waves, voltage deviation, three-phase imbalance, and the like according to the capacitor parameters acquired from the analog input module and the energy consumption algorithm.
The ARM processor is used for outputting the power quality parameters and the energy consumption parameters to a display and a memory for displaying and storing; and on the other hand, the analog quantity input module is used for acquiring data and transmitting the data to the DSP processor for processing.
In this embodiment, the calculation of the DSP processor for the capacitor energy consumption caused by the harmonic, the capacitor energy consumption caused by the voltage deviation, and the capacitor energy consumption caused by the three-phase imbalance belongs to the prior art, and can be referred to in patent application publication No. CN 111220852.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. An electrical energy quality monitoring device, comprising: the system comprises a voltage transformer, a current transformer, a signal conditioning circuit, an A/D sampling circuit, an ARM processor, a DSP processor and a display; the primary side of the voltage transformer is connected with a primary loop of a power grid, and the secondary side of the voltage transformer is connected with the input end of the signal conditioning circuit; the primary side of the current transformer is connected to a primary loop of a power grid, and the secondary side of the current transformer is connected to the input end of the signal conditioning circuit;
the output end of the signal conditioning circuit is connected to the analog input end of the A/D sampling circuit, the digital output end of the A/D sampling circuit is connected with the signal input ends of the DSP processor and the ARM processor, and the DSP processor is connected with the data input and output port of the ARM processor;
the display is connected to the signal output end of the ARM processor and used for displaying the power quality parameters;
the signal conditioning circuit comprises a differential amplifier and a bias circuit, the signal output ends of the voltage transformer and the current transformer are connected with the signal input end of the differential amplifier, the signal output end of the differential amplifier is connected with the signal input end of the bias circuit, and the signal output end of the bias circuit is connected with the ARM processor and the DSP processor.
2. The power quality monitoring device of claim 1, wherein the signal conditioning circuit further comprises a follower circuit, the signal output terminal of the bias circuit is connected to the signal input terminal of the follower circuit and is connected to the ARM processor as one signal output terminal of the signal conditioning circuit, and the signal output terminal of the follower circuit is connected to the DSP signal processor as the other signal output terminal of the signal conditioning circuit.
3. The power quality monitoring device of claim 2, wherein the follower circuit comprises an amplifier, the inverting input terminal of the amplifier and the output terminal of the amplifier simultaneously serve as the signal output terminal of the follower circuit, and the non-inverting input terminal of the amplifier serves as the signal input terminal of the follower circuit.
4. The power quality monitoring device according to claim 1, wherein a first resistor is connected to one end of the primary side of the voltage transformer, a second resistor is connected to the other end of the primary side of the voltage transformer, one end of the secondary side of the voltage transformer is connected to the signal conditioning circuit through a third resistor, and the other end of the secondary side of the voltage transformer is grounded through the third resistor.
5. The power quality monitoring device of claim 1, wherein the display is a touch screen display.
6. The power quality monitoring device of claim 1, further comprising a memory coupled to the signal output of the ARM processor.
7. The power quality monitoring device according to claim 1, wherein the A/D sampling circuit employs an ADC0809 conversion chip.
8. A capacitor comprehensive energy consumption measuring device, comprising the power quality monitoring device according to any one of claims 1 to 7, and further comprising an analog input module, wherein the analog input module is connected to the ARM processor through an RS485 bus, and the ARM processor is configured to transmit the capacitor parameters collected through the analog input module to the DSP processor.
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| CN202021249079.9U CN213780220U (en) | 2020-06-30 | 2020-06-30 | Electric energy quality monitoring device and capacitor comprehensive energy consumption measuring device |
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| CN202021249079.9U CN213780220U (en) | 2020-06-30 | 2020-06-30 | Electric energy quality monitoring device and capacitor comprehensive energy consumption measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220852A (en) * | 2020-02-27 | 2020-06-02 | 国网河南省电力公司电力科学研究院 | Quantitative analysis method and device for influence of power quality on comprehensive energy consumption of capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220852A (en) * | 2020-02-27 | 2020-06-02 | 国网河南省电力公司电力科学研究院 | Quantitative analysis method and device for influence of power quality on comprehensive energy consumption of capacitor |
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