CN111999542A - Method for debugging harmonic current - Google Patents
Method for debugging harmonic current Download PDFInfo
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- CN111999542A CN111999542A CN201910381170.1A CN201910381170A CN111999542A CN 111999542 A CN111999542 A CN 111999542A CN 201910381170 A CN201910381170 A CN 201910381170A CN 111999542 A CN111999542 A CN 111999542A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 2
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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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Abstract
The invention provides a method for debugging harmonic current, when EMC test is carried out on a compressor, harmonic current test equipment can obtain real-time harmonic current of the compressor, then whether the real-time harmonic current meets the limit value of the harmonic current specified by a standard or not is judged, if the real-time harmonic current meets the standard, the compressor is qualified, the debugging is completed, and the compressor meets the standard. If the standard is not met, the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and the first step is returned to for retesting. The control unit can control the control frequency of the power factor correction circuit to be finely adjusted within a certain range, the time and the interval of fine adjustment can be adjusted, and the switching frequency of the corresponding chopper can be correspondingly adjusted. The low-pass filter of the input power supply of the device is not suitable or the harmonic current of the input power supply of the device and the ripple current resonance superposition caused by the control frequency of the power factor correction circuit are reduced, and the generation of harmonic current is reduced.
Description
Technical Field
The invention belongs to the technical field of compressor driver equipment, and particularly relates to a method for debugging harmonic current.
Background
Generally, a device including a compressor driving controller and a compressor must satisfy the standards of electromagnetic compatibility and harmonic current. Compared with the prior standard, the existing harmonic current test standard IEC 61000-3-2 latest edition increases the test requirement of harmonic wave and increases the test frequency range of harmonic current.
Many manufacturers reduce the occurrence of harmonic currents by adding a power factor correction circuit (PFC circuit) to the compressor drive controller. However, ripple current is caused by the control frequency of the control circuit of the PFC circuit, and when the ripple current caused by the control frequency of the PFC circuit and the frequency of the harmonic current of the device power supply itself are close to each other, a resonance phenomenon occurs. Since the frequency of the harmonic current of the power supply itself of the device is unpredictable, the possibility of resonance cannot be avoided. With the technical progress of the control chip and the switching device, the control precision of the control frequency in the prior art is improved from 0.5kHz to 0.1kHz, but the control frequency is mainly used for fine adjustment of the fixed control frequency to avoid the high-frequency noise resonance peak value of the compressor motor, and the control frequency is not controlled aiming at the change of the harmonic current. When the compressor carries out EMC test, 1-40 times of current harmonics of the test power frequency are required by the harmonic current test equipment, namely a 50Hz power supply max2KHz and a 60Hz power supply max2.4KHz. The basic principle of the harmonic current testing equipment is as follows: the collected current or voltage samples are input into an anti-mixing filter to filter frequency components above a certain frequency, then A/D conversion sampling is carried out through a certain sampling rate, and finally FFT is carried out to be transferred to a frequency domain for output. The basic principle of signal acquisition is known as follows: after discrete sampling is performed on a continuous signal, the fourier spectrum of the obtained discrete signal is a period extension of SF times of the fourier spectrum of the original signal, and if the original signal contains the highest frequency component, the spectra of corresponding periods in the discrete signal spectrum overlap, which is called as: aliasing is performed. The method of eliminating aliasing is generally: an anti-aliasing filter is used. On the premise of a certain sampling frequency, frequency components higher than 1/2 times of the sampling frequency are filtered out through a low-pass filter, and frequency aliasing can be avoided through signals subjected to low-pass filtering. However, when the power factor correction circuit adopts a control frequency close to the anti-aliasing filter, a ripple interference signal generated by the control frequency is aliased into the low-frequency signal, which causes a considerable test interference.
Therefore, it is necessary to provide a method for tuning the harmonic current that can avoid resonance and reduce aliasing of the harmonic current.
Disclosure of Invention
The invention aims to provide a method for debugging harmonic current, which is used for solving the problems that in the prior art, when the frequency of the harmonic current caused by the control frequency of a PFC circuit is close to the frequency of the higher harmonic current of a device power supply, resonance and aliasing phenomena are generated.
In order to solve the above technical problem, a first aspect of the present invention provides a method for debugging a harmonic current for a compressor with a drive controller including a power factor correction circuit, the method comprising the steps of:
s1: acquiring real-time harmonic current of the compressor;
s2: judging whether the real-time harmonic current meets the limit value of the harmonic current specified by the standard, if so, determining that the compressor is qualified, finishing debugging, and if not, entering S3;
s3: the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and returns to S1.
Optionally, the step S3 includes: and adjusting the control frequency of the power factor correction circuit by 0-1kHz in 0-10 power supply cycles.
Optionally, the step S3 includes: and adjusting the control frequency of the power factor correction circuit by 0-0.7kHz in 0-8 power supply cycles.
Optionally, the step S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.6kHz in 0-5 power supply periods.
Optionally, the step S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.4kHz in 0-3 power supply periods.
Optionally, the step S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.2kHz in 0-2 power supply periods.
Optionally, the S1 includes:
and acquiring real-time harmonic current of the compressor by utilizing harmonic current testing equipment.
Optionally, the drive controller further includes a control unit, the control unit is configured to adjust a control frequency of the power factor correction circuit to adjust the control frequency of the drive controller, and the S3 includes: the control unit adjusts the switching frequency of the power factor correction unit and returns to S1.
Optionally, the power factor correction circuit includes a chopper, and the control unit is further configured to adjust a switching frequency of the chopper.
Optionally, the control frequency of the drive controller is less than or equal to the switching frequency of the chopper.
The invention provides a method for debugging harmonic current, when EMC test is carried out on a compressor, harmonic current test equipment can obtain real-time harmonic current of the compressor, then whether the real-time harmonic current meets the limit value of the harmonic current specified by a standard or not is judged, if the real-time harmonic current meets the standard, the compressor is qualified, the debugging is completed, and the compressor meets the standard. If the standard is not met, the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and the first step is returned to for retesting. The control unit can control the control frequency of the power factor correction circuit to be finely adjusted within a certain range, the time and the interval of fine adjustment can be adjusted, and the switching frequency of the corresponding chopper can be correspondingly adjusted. The low-pass filter of the input power supply of the device is not suitable or the harmonic current of the input power supply of the device and the ripple current resonance superposition caused by the control frequency of the power factor correction circuit are reduced, and the generation of harmonic current is reduced.
Drawings
FIG. 1 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;
FIG. 2 is a control diagram of a driving controller according to an embodiment of the present invention;
FIG. 3 is a voltage-current waveform of the circuit of FIG. 1;
fig. 4 is a schematic flowchart of a method for debugging a harmonic current according to an embodiment of the present invention;
10-a power factor correction circuit, 101-a low-pass filter, 102-a rectifying circuit and 20-a control unit.
Detailed Description
The method for tuning the harmonic current according to the present invention is further described in detail with reference to the accompanying drawings and the embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
As shown in fig. 4, an embodiment of the present invention provides a method for debugging a harmonic current for a compressor with a drive controller, the drive controller including a power factor correction circuit, including the steps of:
s1: acquiring real-time harmonic current of the compressor;
s2: judging whether the real-time harmonic current meets the limit value of the harmonic current specified by the standard, if so, determining that the compressor is qualified, finishing debugging, and if not, entering S3;
s3: the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and returns to S1.
When the EMC test is performed on the compressor, the real-time harmonic current of the compressor is obtained first, and is generally obtained through a harmonic current test device. And then judging whether the real-time harmonic current of the compressor meets the limit value specified by the standard, wherein the standard mentioned here is the harmonic current test standard IEC 61000-3-2:2014 adopted by the EMC test at present, and certainly, if an updated standard is issued later, the latest harmonic current test standard is taken as the standard, wherein the maximum value of the harmonic current is specified, wherein, the compressor generally belongs to the A-type equipment specified in the standard, the maximum allowable harmonic current of 2 harmonics of the compressor is 1.08A, the maximum allowable harmonic current of 3 harmonics of the compressor is 2.30A, and the limit values of a plurality of other harmonics are also specified in the standard. If the standard is met, the compressor is tested, and the next compressor is tested. If the standard specification is not met, the harmonic current of the compressor is changed by adjusting the control frequency of the drive controller, and then the real-time harmonic current is retested in return until the standard specification is met. The adjustment of the control frequency for the drive controller is typically done by sampling the input voltage, output voltage, input current, and output current of the drive controller to adjust the control frequency. The method provided by the invention can effectively avoid the aliasing phenomenon generated by the signal of the test equipment in the EMC test process, reduce the resonance superposition of the ripple current caused by the unsuitable low-pass filter of the input power supply of the device or the higher harmonic current of the input power supply of the device and the control frequency of the power factor correction circuit, and reduce the generation of the harmonic current.
Optionally, the step of S3 may include: and adjusting the control frequency of the power factor correction circuit by 0-1kHz in 0-10 power supply cycles.
Optionally, the step S3 may further include: and adjusting the control frequency of the power factor correction circuit by 0-0.7kHz in 0-8 power supply cycles.
Optionally, the step S3 may further include: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.6kHz in 0-5 power supply periods.
Optionally, the step S3 may further include: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.4kHz in 0-3 power supply periods.
Optionally, the step S3 may further include: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.2kHz in 0-2 power supply periods.
Alternatively, the S1 may include: and acquiring real-time harmonic current of the compressor by utilizing harmonic current testing equipment.
As shown in fig. 1 and 4, the driving controller includes a power factor correction circuit 10 and a control unit 20, and the control unit 20 is configured to adjust a control frequency of the power factor correction circuit 10. The control frequency is limited by the clock frequency and interrupt frequency of the control chip and the switching speed of the switching devices of the power factor correction circuit 10. In the embodiment of the invention, when the compressor driving device works, because the power factor correction circuit 10 exists, when the frequency of ripple current caused by the control frequency of the power factor correction circuit 10 is close to the frequency of higher harmonic current of the device power supply, a resonance phenomenon can be generated. If the input power low-pass filter 101 of the apparatus is suitable, the high-frequency component contained in the power input current is removed by the low-pass filter 101, but when the power low-pass filter 101 is not suitable, the generation of harmonic current is increased. In the present invention, a control unit 20 is provided in the compressor driving device, the control unit 20 is bi-directionally connected to the power factor correction circuit 10 and can send a control command to the power factor correction circuit 10, the signal sent by the control unit 20 to the power factor correction circuit 10 is a switching signal to a switching device, that is, a chopper Tr, to adjust the control frequency of the power factor correction circuit 10, where the control frequency refers to a control period for the power factor correction circuit 10 to complete sampling, calculating and outputting. It should be noted that the control unit 20 mentioned herein should be a device with data transmission, storage and analysis capability, such as an MCU, or a DSP, or an FPGA, and is not limited herein.
The control unit 20 is operable to make 0-1kHz adjustments to the control frequency of the pfc circuit 10 over 0-10 power cycles. The power cycle is the time when the alternating current power supply alternates one cycle, and is equal to the reciprocal of the power frequency. Of course, the time and interval of the control frequency adjustment of the power factor correction circuit 10 by the control unit 20 are not fixed, and other situations are also possible, for example, the control unit 20 may be used to make an adjustment of 0-0.7kHz to the control frequency of the power factor correction circuit 10 in 0-8 power cycles. The control unit 20 may also be used to make 0-0.6kHz adjustments to the control frequency of the pfc circuit 10 over 0-5 power cycles. The control unit 20 is also used for making 0-0.4kHz adjustment on the control frequency of the power factor correction circuit 10 in 0-3 power source cycles. The control unit 20 may also be used to make 0-0.2kHz adjustments to the control frequency of the pfc circuit 10 over 0-2 power cycles.
Optionally, the power factor correction circuit 10 includes a chopper, and as shown in fig. 1, the control unit 20 is further configured to adjust a switching frequency of the chopper. Fig. 1 shows a boost-chopper power factor correction circuit 10, which can change an input current into a sine wave by a simple circuit and can increase an output dc voltage. Where i is the power input current, i1 is the current of i after passing through the rectifier circuit 102, i2 is the dc output current, V is the power input voltage, V1 is the voltage of the power input voltage V after passing through the rectifier circuit 102, and Vdc is the output dc voltage. The chopper has two working modes, namely an ON state and an OFF state. When the chopper is operated in the ON state, a voltage V1 is applied to the reactor L, a reactor L current i2 increases, and energy is accumulated in the reactor L. Assuming that the time for which the chopper is in the ON state is Δ Ton, the increase Δ i2ON of i2 is as follows:
Δi2on＝1/L×V1×ΔTon
when the chopper is operated in the OFF state, the energy accumulated in the reactor L is transmitted to the output side. In the transmission mode, voltage V1-Vdc is applied to reactor L. The step-up chopper always has V1 < Vdc, so V1-Vdc is negative and reactor L current iL is reduced. Assuming that the OFF time of Tr is Δ Toff, the decrement Δ i2OFF in iL is as follows:
Δi2off＝1/L×(V1－Vdc)×ΔToff
by controlling the ON time and OFF time of the chopper main element Tr, the current iL of the reactor L can be controlled, and thus the input current is can be controlled to be a sine wave.
Optionally, the control frequency of the drive controller is less than or equal to the switching frequency of the chopper.
The invention provides a method for debugging harmonic current, when EMC test is carried out on a compressor, harmonic current test equipment can obtain real-time harmonic current of the compressor, then whether the real-time harmonic current meets the limit value of the harmonic current specified by a standard or not is judged, if the real-time harmonic current meets the standard, the compressor is qualified, the debugging is completed, and the compressor meets the standard. If the standard is not met, the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and the first step is returned to for retesting. The control unit can control the control frequency of the power factor correction circuit to be finely adjusted within a certain range, the time and the interval of fine adjustment can be adjusted, and the switching frequency of the corresponding chopper can be correspondingly adjusted. The low-pass filter of the input power supply of the device is not suitable or the harmonic current of the input power supply of the device and the ripple current resonance superposition caused by the control frequency of the power factor correction circuit are reduced, and the generation of harmonic current is reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method of tuning harmonic currents for a compressor with a drive controller including a power factor correction circuit, the method comprising the steps of:
s1: acquiring real-time harmonic current of the compressor;
s2: judging whether the real-time harmonic current meets the limit value of the harmonic current specified by the standard, if so, determining that the compressor is qualified, finishing debugging, and if not, entering S3;
s3: the control frequency of the drive controller is adjusted to change the harmonic current of the compressor, and returns to S1.
2. The method for tuning harmonic currents according to claim 1, wherein the step of S3 includes: and adjusting the control frequency of the power factor correction circuit by 0-1kHz in 0-10 power supply cycles.
3. The method for tuning harmonic currents according to claim 1, wherein the step of S3 includes: and adjusting the control frequency of the power factor correction circuit by 0-0.7kHz in 0-8 power supply cycles.
4. The method for tuning harmonic currents according to claim 1, wherein the step of S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.6kHz in 0-5 power supply periods.
5. The method for tuning harmonic currents according to claim 1, wherein the step of S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.4kHz in 0-3 power supply periods.
6. The method for tuning harmonic currents according to claim 1, wherein the step of S3 includes: the control unit is used for adjusting the control frequency of the power factor correction circuit by 0-0.2kHz in 0-2 power supply periods.
7. The method of tuning harmonic currents according to claim 1, wherein said S1 comprises:
and acquiring real-time harmonic current of the compressor by utilizing harmonic current testing equipment.
8. The method of tuning harmonic currents according to claim 1, wherein the driving controller further comprises a control unit for adjusting a control frequency of the power factor correction circuit to adjust the control frequency of the driving controller, the S3 comprising: the control unit adjusts the switching frequency of the power factor correction unit and returns to S1.
9. A method of tuning harmonic currents as in claim 8, wherein said power factor correction circuit comprises a chopper, and said control unit is further adapted to adjust the switching frequency of said chopper.
10. A method of tuning harmonic currents as in claim 9, wherein the control frequency of the drive controller is less than or equal to the switching frequency of the chopper.
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| 杨显彬: "一种谐波电流超标问题的分析与解决", 现代电子技术 * |
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Application publication date: 20201127 |