CN110729734B - Resonance point debugging loop and method of high-voltage power filter device - Google Patents
Resonance point debugging loop and method of high-voltage power filter device Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
Abstract
The invention discloses a resonance point debugging loop and a debugging method of a high-voltage power filtering device. The invention has simple debugging loop and the debugging method is applicable, thus the high-voltage filter device can safely, stably and reliably work for a long time.
Description
Technical Field
The invention relates to the field of electric energy quality, in particular to a resonance point debugging loop and a debugging method of a high-voltage power filter device.
Background
In order to ensure the reliable and normal operation of the power system and improve the stability and the electric energy quality of the power system, the harmonic waves of the power grid need to be treated.
In recent years, the rapid development of power electronics technology and the wide application in power systems, traffic, industrial equipment and household life have increased the risk of harmonics. The harmonic wave can reduce the generation, transmission and use efficiency of electric energy, the harmonic wave leads to the waveform distortion of voltage and current in the electric power system, and the harmonic voltage and harmonic current with the same frequency can generate the active power and reactive power loss of the same harmonic wave, thereby not only leading to the reduction of the voltage of the power grid, but also leading to the waste of the capacity of the electric power system. The electrical equipment is overheated under the action of harmonic waves, vibration and noise interference are generated, insulation aging is accelerated, service life is seriously influenced, and even faults and burning are caused if the electrical equipment is not controlled. In addition, the harmonic wave can cause local series resonance and parallel resonance in the power grid, so that the harmonic wave content is amplified, and the equipment of the capacitor and the reactor is destroyed. The harmonic waves also cause problems to relay protection equipment, cause malfunction of the relay protection device, seriously threaten the stable and safe operation of a power supply and distribution system, and cause unnecessary consequences. For weak current equipment such as computer networks, wired televisions, communication and the like outside a power system, harmonic waves in the power system are coupled in a conduction mode, an electromagnetic induction mode and the like, so that larger interference is generated on the systems, and the harmonic waves can also seriously influence communication equipment and electronic devices.
The common filtering modes are an active filtering mode and a passive filtering mode, and the passive power filtering device has the advantages of good safety, high reliability, simple circuit structure, low manufacturing cost and low operation cost and is widely applied to a power system.
In the practical use of the high-voltage power filter device, the resonance point of each filter branch is the key of safe operation of the device and reaching the design expected effect. Due to factors such as component manufacturing deviation, the high-voltage filter device must be debugged at the resonance point in practical application.
The filtering branch of the high-voltage filtering device mainly comprises a filtering capacitor and a filtering reactor. The working principle is common knowledge, but the debugging instrument and method are different.
The document CN203502518U discloses a portable parallel power filter tuning and debugging test box, which refers to a tuning and debugging circuit, and the test circuit comprises a voltmeter, a high-power digital signal generator, a resistor, an ammeter and a connecting wire.
From document CN203502518U it is known that: 1) The high-power digital signal generator is a voltage source; 2) And the measurement of the voltage of the capacitive reactance loop, the capacitor and the reactor is realized by using a single-pole double-throw switch in the measurement loop. Because the resistance exists in the measuring loop, when 3 voltages are measured in the debugging process, the loop impedance values are different, the current values are different, and the voltage value error is relatively large. In addition, when the filter reactors are stacked, the error in measurement of the measuring circuit is also large.
In summary, the resonant point debugging loop and the debugging method of the high-voltage power filter device are the technologies to be solved.
Disclosure of Invention
In order to solve the problems and improve the efficiency and accuracy of debugging the resonance point of the high-voltage power filter device, the invention provides a circuit and a method for debugging the resonance point of the high-voltage power filter device.
The technical scheme adopted by the invention is as follows.
The invention provides a resonance point debugging loop of a high-voltage power filter device, wherein a filter branch of the high-voltage power filter device mainly comprises a filter capacitor and a filter reactor, and the debugging loop mainly comprises the filter capacitor, the filter reactor, a harmonic signal generator, an ammeter, a double-channel oscillometer and connecting wires. The harmonic signal generator, the filter capacitor, the filter reactor and the ammeter sequentially pass through connecting wires to form a loop. The dual-channel oscillometer consists of an A port, a B port and a com port, wherein the com port is a public wiring, the A port and the com port form a measurement channel A, and the B port and the com port form a measurement channel B. The com port of the double-channel oscillometer is connected to the connection position of the filter capacitor and the filter reactor, the A port of the double-channel oscillometer is connected to the connection position of the filter reactor and the ammeter, and the B port of the double-channel oscillometer is connected to the connection position of the harmonic signal generator and the filter capacitor.
The harmonic signal generator is a current source type signal generator, the frequency range is 0-3 KHz, and the current is 0-5A.
The dual-channel oscillometer is provided with a A, B measuring channel which can measure AC/DC voltage, current and frequency and select a voltage measuring file.
The ammeter is a digital ammeter or a digital multimeter, and the current is 0-5A.
The connecting wire material is 2.5mm 2 Is provided.
Furthermore, the harmonic signal generator can also select a low-power harmonic power supply which is convenient to carry.
Furthermore, the two-channel oscillography table can also be a multi-channel oscillography table or a multi-channel oscilloscope, and the wiring positions of the measuring channels A and B and the loop can be exchanged.
Further, the filter reactor adopts a dry hollow and cake-shaped structure, the inductance is continuously adjustable, and the noise is less than 70 dB
Furthermore, 3 harmonic signal generators and ampere meters are selected when the three phases of the filter reactors are stacked.
Further, when the filter reactors are stacked in three phases, the connection parts of the filter capacitors and the filter reactors of the three-phase branch circuits are connected in parallel and then connected with the com port, the voltage value of the A, B, C-phase debugging loop is sequentially measured by the two-channel oscillometer, and the A port and the B port of the two-channel oscillometer are sequentially connected into the A, B, C-phase debugging loop.
The invention also provides a resonance point debugging method of the high-voltage power filter device, which comprises the following steps:
(1) Resonance point tuning frequency determination: knowing the capacitance C of the filter capacitor, the inductance L of the filter reactor, the designed operating resonant frequency fn is calculated according to the formula,
taking the influences of temperature change and power system load change factors into consideration, the debugging frequency fnt is close to the fn value;
(2) Debug loop connection: the harmonic signal generator, the filter capacitor, the filter reactor and the ammeter sequentially form a loop through connecting wires, a com port of the double-channel oscillometer is connected to the filter capacitor and the filter reactor, an A port of the double-channel oscillometer is connected to the filter reactor and the ammeter, and a B port of the double-channel oscillometer is connected to the harmonic signal generator and the filter capacitor;
(3) Debugging: observing the readings of the channels of the two-channel oscillography meter A, B from the frequency of the harmonic signal generator to fn and the current set value I, namely, the voltage values Vl and Vc of the filter reactors and the filter capacitors, if Vl is larger than Vc, reducing the air gap between the filter reactors to reduce the inductance value, if Vl is smaller than Vc, increasing the air gap between the filter reactors to increase the inductance value, repeatedly adjusting the inductance value, and adjusting the frequency value to be slightly smaller than the Vc until the Vl value is slightly smaller than Vc, recording the debugging frequency fnt, the debugging current I, the voltage value Vl of the filter reactors and the voltage value Vc of the filter capacitors at the moment, then connecting the com port of the two-channel oscillography meter to the connection position of the harmonic signal generator and the filter capacitors, and recording the voltage V0 value of the filter circuit at the moment;
(4) And (3) performing verification: according to the recorded debug frequency fnt, debug current I, filter reactor voltage value Vl, filter capacitor voltage value Vc, filter loop voltage V0, calculating filter capacitor capacitance Ct, filter reactor reactance Lt, debug frequency fnt in the debug loop, if frequency fnt 0 Near fn, finishing debugging, otherwise, repeating the step (3) until meeting the requirement
The beneficial effects of the invention are as follows: the error in the process of debugging the resonance point of the high-voltage power filter device is reduced, the debugging accuracy is improved, and the working efficiency is improved.
The invention has simple debugging loop and the debugging method is applicable, thus the high-voltage filter device can safely, stably and reliably work for a long time.
Drawings
FIG. 1 is a schematic diagram of a debug loop according to the present invention.
Fig. 2 is a circuit diagram of fig. 1.
Fig. 3 is a schematic diagram of a debugging loop when three phases of filter reactors are stacked.
In the figure, a 1-filter capacitor; a 2-filter reactor; a 3-harmonic signal generator; 4-ammeter; 5-a dual-channel oscillometer;
a 51-A port; a 52-com port; 53-B port.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As can be seen from fig. 1 and 2:
the filtering branch of the high-voltage power filtering device mainly comprises a filtering capacitor 1 and a filtering reactor 2, and the debugging loop mainly comprises the filtering capacitor 1, the filtering reactor 2, a harmonic signal generator 3, an ammeter 4, a double-channel oscillometer 5 and connecting wires. The harmonic signal generator 3, the filter capacitor 1, the filter reactor 2 and the ammeter 4 sequentially form a loop through connecting wires. The dual-channel oscillometer 5 is composed of an A port 51, a B port 53 and a com port 52, the com port 52 is a common wiring, the A port 51 and the com port 52 form a measurement channel A, and the B port 53 and the com port 52 form a measurement channel B. The com port 52 of the dual-channel oscillometer 5 is connected to the connection position of the filter capacitor 1 and the filter reactor 2, the A port 51 of the dual-channel oscillometer 5 is connected to the connection position of the filter reactor 2 and the ammeter 4, and the B port 53 of the dual-channel oscillometer 5 is connected to the connection position of the harmonic signal generator 3 and the filter capacitor 1.
As can be seen from fig. 3:
further, when the filter reactor 2 is stacked in three phases, the connection parts of the filter capacitor 1 and the filter reactor 2 of the three-phase branch are connected in parallel and then connected with the com port 52, the dual-channel oscillometer 5 sequentially measures the voltage value of a A, B, C-phase debugging loop, the A-phase debugging voltage value is shown by a solid line, and the B, C-phase debugging loop is shown by a dotted line.
A method of tuning the resonance point of a high voltage power filter device is described by example 1.
Example 1:
step (1) resonance point debugging frequency determination:
the capacitance C= 6.9759 mu F of the filter capacitor, the inductance L= 30.8209mH of the filter reactor can be calculated
fn＝343.24Hz；
Step (3) debugging:
debug frequency fnt = 343.3Hz, debug current i=1a, filter reactor voltage value vl=62.8v, filter capacitor voltage value vc=62.6v, filter loop voltage v0= 1.927V;
and (4) performing verification:
calculated according to ohm's law formula:
filter capacitor capacitance ct= 7.405 μf, filter reactor reactance lt= 29.114mH.
Calculated according to formula (a): fnt 0 = 342.75Hz. The calculated debugging frequency value is 0.49Hz smaller than the designed working frequency fn, and the debugging method is effective and accurate.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (2)
1. The utility model provides a resonance point debugging return circuit of high voltage electric power filter device which characterized in that: the debugging loop comprises a filter capacitor, a filter reactor, a harmonic signal generator, an ammeter, a two-channel oscillometer and connecting wires, wherein the harmonic signal generator, the filter capacitor, the filter reactor and the ammeter sequentially pass through the connecting wires to form a loop, the two-channel oscillometer consists of an A port, a B port and a com port, the com port is a public wiring, the A port and the com port form a measuring channel A to measure voltage, the B port and the com port form a measuring channel B to measure voltage, the com port of the two-channel oscillometer is connected to the connecting part of the filter capacitor and the filter reactor, the A port of the two-channel oscillometer is connected to the connecting part of the filter reactor and the ammeter, the B port of the two-channel oscillometer is connected to the connecting part of the harmonic signal generator and the filter capacitor, and the harmonic signal generator adopts a current source type signal generator;
during debugging, the frequency of the harmonic signal generator is adjusted to fn and a current set value I, the readings of a A, B channel of the dual-channel oscillography table are observed, namely, the voltage values Vl and Vc of the filter reactors and the filter capacitors are reduced, if Vl is larger than Vc, the air gap between the filter reactors is reduced, the inductance value is reduced, if Vl is smaller than Vc, the air gap between the filter reactors is increased, the inductance value is increased, the value of the inductance value can be adjusted repeatedly, the frequency modulation value can be reduced until the Vl value is slightly smaller than Vc, the debugging frequency fnt, the debugging current I, the voltage value Vl of the filter reactors and the voltage value Vc of the filter capacitors at the moment are recorded, and then the com port of the dual-channel oscillography table is connected to the connection position of the harmonic signal generator and the filter capacitors, and the voltage V0 value of the filter circuit at the moment is recorded;
during the verification, according to the recorded debug frequency fnt, debug current I, filter reactor voltage value Vl, filter capacitor voltage value Vc and filter loop voltage V0, the filter capacitor capacitance Ct, filter reactor reactance Lt and debug frequency fnt in the debug loop are calculated, if the frequency fnt 0 Near fn, debug is over, otherwiseRepeating debugging until the requirements are met;
the ammeter is a digital ammeter or a digital multimeter;
the oscillograph is a two-channel oscillograph, a multi-channel oscillograph or a multi-channel oscilloscope.
2. A resonance point tuning method of a resonance point tuning circuit employing a high voltage power filtering apparatus as claimed in claim 1, comprising the steps of:
(1) Resonance point tuning frequency determination: knowing the capacitance C of the filter capacitor and the inductance L of the filter reactor, calculating the designed working resonant frequency fn according to a formula;
(2) Debug loop connection: the harmonic signal generator, the filter capacitor, the filter reactor and the ammeter sequentially form a loop through connecting wires, a com port of the double-channel oscillometer is connected to the filter capacitor and the filter reactor, an A port of the double-channel oscillometer is connected to the filter reactor and the ammeter, and a B port of the double-channel oscillometer is connected to the harmonic signal generator and the filter capacitor;
(3) Debugging: observing the readings of the channels of the two-channel oscillography meter A, B from the frequency of the harmonic signal generator to fn and the current set value I, namely, the voltage values Vl and Vc of the filter reactors and the filter capacitors, if Vl is larger than Vc, reducing the air gap between the filter reactors to reduce the inductance value, if Vl is smaller than Vc, increasing the air gap between the filter reactors to increase the inductance value, repeatedly adjusting the inductance value, and adjusting the frequency value to be slightly smaller than the Vc until the Vl value is slightly smaller than Vc, recording the debugging frequency fnt, the debugging current I, the voltage value Vl of the filter reactors and the voltage value Vc of the filter capacitors at the moment, then connecting the com port of the two-channel oscillography meter to the connection position of the harmonic signal generator and the filter capacitors, and recording the voltage V0 value of the filter circuit at the moment;
(4) And (3) performing verification: according to the recorded debug frequency fnt, debug current I, filter reactor voltage value Vl, filter capacitor voltage value Vc, filter loop voltage V0, calculating filter capacitor capacitance Ct, filter reactor reactance Lt, debug frequency fnt in the debug loop, if frequency fnt 0 Near fn, debug nodeAnd (3) bundling, otherwise, repeating the step (3) until the requirements are met.
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