CN210957799U - Electric power harmonic controller - Google Patents
Electric power harmonic controller Download PDFInfo
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- CN210957799U CN210957799U CN201922336408.7U CN201922336408U CN210957799U CN 210957799 U CN210957799 U CN 210957799U CN 201922336408 U CN201922336408 U CN 201922336408U CN 210957799 U CN210957799 U CN 210957799U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a power harmonic controller belongs to power electronic equipment technical field. The technical scheme is as follows: the square wave signal circuit (1) is connected with the homodromous input ends of the four operational amplifiers through a resistor R2, the signal conditioning circuit (2) is connected with the reverse input ends of the four operational amplifiers through a resistor R3, the reset circuit (3) is connected with the reverse input ends of the four operational amplifiers through a resistor R4, meanwhile, a series capacitor C3 is connected with the output ends of the four operational amplifiers, and the output ends of the four operational amplifiers are connected with the output module (4). The utility model discloses realize synchronous sampling to electric wire netting voltage and electric current simultaneously, restrain the harmonic, improve the electric energy quality, the real-time is good, the precision is high, has better flexibility.
Description
Technical Field
The utility model relates to a power harmonic controller belongs to power electronic equipment technical field.
Background
With the development of electric power utilities, the rapid popularization of various power electronic devices leads harmonic pollution of a public power grid to be more serious, for example, the harmonic waves in the power grid exist in a large quantity due to distortion of voltage and current waveforms of the power grid, reduction of power factors, three-phase imbalance and the like, and the quality of electric energy is reduced. The pollution of the harmonic wave to the power system not only harms the system, but also generates additional loss, increases the temperature rise of equipment, deteriorates the insulation condition, shortens the service life of the equipment and the like, and the reactive compensation capacitor bank can cause harmonic resonance, thereby causing dangerous over current or over voltage, malfunction of a protection device, inaccurate measurement and the like. Therefore, it becomes important to analyze the real-time harmonic pollution condition on site and switch the filter.
Disclosure of Invention
The utility model aims at providing an electric power harmonic controller realizes synchronous sampling to grid voltage and electric current simultaneously, and the real-time is good, the precision is high, has better flexibility, has solved the above-mentioned problem that exists effectively among the background art.
The technical scheme of the utility model is that: a power harmonic controller comprises a square wave signal circuit, a signal conditioning circuit, a reset circuit, four operational amplifiers and an output module, wherein the square wave signal circuit is connected with the homodromous input ends of the four operational amplifiers through a resistor R2, the signal conditioning circuit is connected with the reverse input ends of the four operational amplifiers through a resistor R3, the reset circuit is connected with the reverse input ends of the four operational amplifiers through a resistor R4, meanwhile, a serially connected capacitor C3 is connected with the output ends of the four operational amplifiers, and the output ends of the four operational amplifiers are connected with the output module.
The signal conditioning circuit comprises a voltage transformer and an operational amplifier, wherein the input voltage is connected with the input end of the voltage transformer through a current-limiting resistor, and the primary side and the secondary side of the output end of the voltage transformer are connected with the operational amplifier; the primary side of the voltage transformer is 100V, and the secondary side of the voltage transformer is connected with a feedback resistor.
The square wave signal circuit comprises a dual voltage comparator integrated circuit and a monostable multivibrator which are connected with each other.
The signal detection module and the AD conversion circuit are connected with the signal conditioning circuit, and the liquid crystal display device is connected with the four operational amplifiers.
The utility model has the advantages that: the synchronous sampling is realized on the voltage and the current of the power grid at the same time, the harmonic waves are suppressed, the electric energy quality is improved, the real-time performance is good, the precision is high, and the flexibility is good.
Drawings
Fig. 1 is a circuit diagram of the present invention;
fig. 2 is a circuit diagram of the signal conditioning circuit of the present invention;
fig. 3 is a circuit diagram of the square wave signal circuit of the present invention;
in the figure: the circuit comprises a square wave signal circuit 1, a double-voltage comparator integrated circuit 11, a monostable multivibrator 12, a signal conditioning circuit 2, a voltage transformer 21, an operational amplifier 22, a reset circuit 3, an output module 4, a four-operational amplifier 5 and a current limiting resistor 6.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
A power harmonic controller comprises a square wave signal circuit 1, a signal conditioning circuit 2, a reset circuit 3, an LM324 four-operational amplifier 5 and an output module 4, wherein the square wave signal circuit 1 is connected with the homodromous input end of the LM324 four-operational amplifier 5 through a resistor R2, the signal conditioning circuit 2 is connected with the reverse input end of the LM324 four-operational amplifier through a resistor R3, the reset circuit 3 is connected with the reverse input end of the LM324 four-operational amplifier 5 through a resistor R4, meanwhile, a capacitor C3 is connected with the output end of the LM324 four-operational amplifier 5 in series, and the output end of the LM324 four-operational amplifier 5 is connected with the output module 4.
The signal conditioning circuit 2 comprises an SPT204A voltage transformer 21 and an OP07CN operational amplifier 22, the input voltage is connected with the input end of the SPT204A voltage transformer 21 through a 50K current-limiting resistor 6, and the primary side and the secondary side of the output end of the SPT204A voltage transformer 21 are connected with the OP07CN operational amplifier 22; the primary side of the SPT204A voltage transformer 21 is 100V, and the secondary side of the SPT204A voltage transformer 21 is connected to a feedback resistor.
The square-wave signal circuit 1 comprises an LM393 dual voltage comparator integrated circuit 11 and an SN74121N monostable multivibrator 12, which are connected to each other.
Still contain signal detection module, AD converting circuit and liquid crystal disply device, signal detection module and AD converting circuit are connected with signal conditioning circuit 2, and liquid crystal disply device is connected with four operational amplifier 5 of LM 324.
In practical application, the power harmonic controller comprises a signal detection module, an AD conversion circuit, a square wave signal circuit, a signal conditioning circuit, a reset circuit, an LM324 four-operational amplifier, a liquid crystal display and output module, and the like. The signal detection module is mainly used for detecting components such as harmonic waves, reactive power and the like of current in the power grid. The power harmonic controller can realize uninterrupted and high-speed processing, and the cost of the power harmonic controller is reduced.
The signal conditioning circuit adds a direct current boosting circuit to positive and negative three-phase alternating current voltage and current signals input at the front end to convert the signals into 3.3V unipolar signals, and the introduction of the signals is easily interfered by the outside, so special attention needs to be paid to the selection of the type of the mutual inductor and the interference resistance of the conditioning circuit.
The primary side of the SPT204A voltage transformer is 100V, namely UA input voltage range is 0-100V, the input voltage passes through a 50K current-limiting resistor, so that the primary side of the SPT204A voltage transformer generates a rated current of 2mA, and the secondary side generates the same current. The OP07CN operational amplifier can adjust the value of the feedback resistance to obtain the required voltage output value, and convert the secondary output 2mA current into 0- +3.3V voltage.
The square wave signal circuit is mainly used for generating a square wave signal synchronous with a power grid input voltage signal, converting the square wave signal into a synchronous trigger pulse through the circuit, and then sending the synchronous trigger pulse to a capture interface of the DSP control chip for generating an edge capture signal to trigger corresponding interrupt, so that a corresponding interrupt service subprogram is called. Taking a phase of a three-phase alternating-current low-voltage power grid as an example, after a power supply voltage is processed by a voltage transformer, when the voltage passes through a zero point (including a positive zero-crossing point from negative to positive or a negative zero-crossing point from positive to negative), a circuit immediately transmits a signal of voltage zero-crossing point detection to a CPU (central processing unit), and the signal is provided for the CPU for calculation so as to achieve the purpose of synchronization of tracking the voltage frequency of the power grid.
Claims (4)
1. A power harmonic controller, characterized by: contain square wave signal circuit (1), signal conditioning circuit (2), reset circuit (3), four operational amplifier (5) and output module (4), square wave signal circuit (1) is connected with the syntropy input of four operational amplifier (5) through resistance R2, and signal conditioning circuit (2) are connected with the reverse input of four operational amplifier (5) through resistance R3, and reset circuit (3) are connected with the reverse input of four operational amplifier (5) through resistance R4, concatenate simultaneously electric capacity C3 and the output of four operational amplifier (5) and be connected, and the output module (4) of four operational amplifier (5) are connected.
2. A power harmonic controller according to claim 1 wherein: the signal conditioning circuit (2) comprises a voltage transformer (21) and an operational amplifier (22), wherein the input voltage is connected with the input end of the voltage transformer (21) through a current-limiting resistor (6), and the primary side and the secondary side of the output end of the voltage transformer (21) are connected with the operational amplifier (22); the primary side of the voltage transformer (21) is 100V, and the secondary side of the voltage transformer (21) is connected with a feedback resistor.
3. A power harmonic controller according to claim 1 wherein: the square-wave signal circuit (1) comprises a dual voltage comparator integrated circuit (11) and a monostable multivibrator (12) which are interconnected.
4. A power harmonic controller according to claim 1 wherein: the signal detection module and the AD conversion circuit are connected with the signal conditioning circuit (2), and the liquid crystal display device is connected with the four operational amplifiers (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922336408.7U CN210957799U (en) | 2019-12-24 | 2019-12-24 | Electric power harmonic controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922336408.7U CN210957799U (en) | 2019-12-24 | 2019-12-24 | Electric power harmonic controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210957799U true CN210957799U (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922336408.7U Active CN210957799U (en) | 2019-12-24 | 2019-12-24 | Electric power harmonic controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210957799U (en) |
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2019
- 2019-12-24 CN CN201922336408.7U patent/CN210957799U/en active Active
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