CN-121984001-A - Harmonic suppressor for suppressing odd harmonics and installation and design method thereof

CN121984001ACN 121984001 ACN121984001 ACN 121984001ACN-121984001-A

Abstract

The invention provides a harmonic suppressor for suppressing odd harmonics and an installation and design method thereof. A harmonic suppressor for suppressing an odd harmonic includes a resonance capacitor for generating resonance at a frequency of the odd harmonic to reduce an interference current on a power line of a device, and a resonance inductance connected in parallel with the resonance inductance through a line. The suppression of odd harmonics is realized through resonance, so that the volume can be effectively reduced, and meanwhile, the performance of the equipment is not affected. The harmonic wave suppression has stability and does not change along with the change of the working state of the equipment. The harmonic current is suppressed through resonance, so that useless power during the operation of the equipment can be effectively reduced, and the power consumption of the equipment can be reduced. Resonance is generated at the frequency of the corresponding odd harmonic by the inductance-capacitance generating resonance circuit, and the odd harmonic current is consumed so that the odd harmonic current cannot enter the subsequent equipment.

Inventors

LIU BINGCHAO
LI FENG
WANG MENGTING
ZHANG XU
LI ZHIRU
LU PENGCHENG
WANG JING
Shi Yangzi
ZHANG HAO
LI ZONGZHI
Chang Xuelong
CAO WENJIE

Assignees

北京航天微电科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251202

Claims (10)

1. A harmonic suppressor for suppressing an odd harmonic is characterized by comprising a resonance capacitor for generating resonance at the frequency of the odd harmonic to reduce an interference current on a power line of a device and a resonance inductor, wherein the resonance capacitor is connected in parallel with the resonance inductor through a line.
2. The harmonic suppressor for suppressing odd harmonics according to claim 1, wherein said resonant inductor comprises a core which is not easily saturated and a coil wound around said core, said coil having a current density not greater than a predetermined value.
3. The harmonic suppressor for suppressing odd harmonics according to claim 2, wherein the magnetic core is of a circular ring structure, the magnetic core is made of metal magnetic powder core and silicon steel sheet, the coil is an enameled wire, the preset value is 10A/mm 2 , a starting end and a tail end are reserved on the magnetic core, and the coil is uniformly distributed on the outer side wall of the magnetic core along the direction parallel to the axis of the magnetic core.
4. A harmonic inhibitor for inhibiting odd harmonics according to claim 1, wherein the frequencies of the odd harmonics comprise 150Hz, 250Hz and 350Hz for a 50Hz power supply system.
5. The harmonic suppressor for suppressing an odd harmonic according to claim 4, wherein the inductance of the resonant inductor is 25mH and the capacitance of the resonant capacitor is 45 μf for a 50Hz power supply system at 150Hz, the inductance of the resonant inductor is 10mH for a 50Hz power supply system at 250Hz, the capacitance of the resonant capacitor is 40 μf for a 50Hz power supply system at 350Hz, and the inductance of the resonant inductor is 5mH and the capacitance of the resonant capacitor is 41 μf for a 50Hz power supply system at 350 Hz.
6. A method of installing a harmonic inhibitor for inhibiting an odd harmonic, characterized in that the method of installing a harmonic inhibitor for inhibiting an odd harmonic based on a harmonic inhibitor for inhibiting an odd harmonic as claimed in any one of claims 1 to 5 comprises: in single-phase alternating current equipment, a harmonic suppressor for suppressing odd harmonics is arranged on an L line connected with an input end of the equipment; In a three-phase device, a harmonic inhibitor for inhibiting odd harmonics is mounted on a phase line connected to an input terminal of the device.
7. A method for designing a harmonic suppressor for suppressing an odd harmonic, characterized in that the method for designing a harmonic suppressor for suppressing an odd harmonic according to any one of the above claims 1 to 5 comprises: Designing a resonant inductor and a resonant capacitor according to parameters of the equipment; and the resonant capacitor and the resonant inductor are connected in series through a circuit to form a resonant circuit.
8. The method for designing a harmonic suppressor for suppressing odd harmonics according to claim 7, wherein said step of designing the resonant inductor and the resonant capacitor according to the parameters of the device comprises selecting a core that is not easily saturated, and obtaining the size of the device and the power at the time of operation; Determining a magnetic core specification and a wound coil specification according to the size of the equipment and the power in operation, wherein the current density of the coil is not more than a preset value; carrying out simulation treatment on harmonic frequency of equipment; And determining the specification of the resonant capacitor according to the harmonic frequency.
9. The method of designing a harmonic trap for suppressing odd harmonics according to claim 8, wherein said step of determining the core size and the wound coil size based on the size of the apparatus and the power at the time of operation comprises tightly winding the coil around the core.
10. The method of designing a harmonic trap for suppressing odd harmonics according to claim 7, wherein the step of connecting the resonant capacitor and the resonant inductor in series through the line to form the resonant circuit includes trimming the capacitance and inductance.

Description

Harmonic suppressor for suppressing odd harmonics and installation and design method thereof Technical Field The invention relates to the technical field of filters, in particular to a harmonic suppressor for suppressing odd harmonics and an installation and design method thereof. Background With the development of electronic technology, the problem of electromagnetic compatibility is a very serious concern and troublesome problem for circuit design engineers. With the development of filtering technology, most of the electromagnetic compatibility problems can be handled by EMI filters, but the CE101 (25 Hz-10kHz power line conducted emission) project is difficult to solve by conventional EMI filtering technology. For surface ships and submarines, the hull current can reduce the performance of electronic equipment, interfere with a grounding detector, counteract demagnetization, and simultaneously the excessive harmonic can also distort a power supply, and when the total distortion of the power supply is more than 5%, the tolerance of most electronic equipment, induction motors, magnetic devices and measuring equipment is exceeded. The CE101 project test is therefore required for power lines for surface vessels, submarines and equipment on aircraft. As shown in FIG. 9, the horizontal axis is Frequency in Hz-Frequency (Hz), in logarithmic scale, ranging from 50Hz to 10kHz. The vertical axis is Level in dB, the linear scale, ranging from about 30dB to 180dB. The vertical axis represents insertion loss, and the curve represents loss of the suppressor to the signal at a specific frequency point. The main frequency of the power supply harmonic exceeds the standard, namely, the odd harmonic is usually in the frequency range of 150Hz, 250Hz, 350Hz and the like for a 50Hz power supply system. Aiming at the problem of exceeding CE101, the current solving approach mainly comprises filtering by a conventional EMI filter and filtering by an active filter. Because the frequency is lower and the filter is a differential mode interference signal, the conventional EMI filter filters through a differential mode inductor, the filtering mode is influenced by product current, the EMI filter has an obvious inhibiting effect on higher frequency signals, when the frequency is lower, the required inductance is larger, the occupied space is larger, and meanwhile, when the inductance is larger, the inductance impedance is increased, so that the voltage is consumed, the equipment is abnormal in power supply and cannot be started normally. The active filter counteracts the interference of the odd harmonics generated by the device by applying the opposite odd harmonics, thereby reducing the interference. However, the active filter has poor stability, and when the current fluctuates, the filtering effect changes greatly, and parameters need to be adjusted. While the interference imposed by the active filter may be aggravated by other electromagnetic compatibility issues. Disclosure of Invention The invention aims to solve the technical problem of providing a harmonic suppressor for suppressing odd harmonics and an installation and design method thereof. The technical scheme of the invention for solving the technical problems is that the harmonic suppressor for suppressing the odd harmonics comprises a resonance capacitor and a resonance inductor, wherein the resonance capacitor is used for generating resonance at the frequency of the odd harmonics so as to reduce interference current on a power line of equipment, and the resonance capacitor is connected with the resonance inductor in parallel through a circuit. The technical scheme has the beneficial effects that the odd harmonics are restrained through resonance, the volume can be effectively reduced, and meanwhile, the performance of the equipment is not affected. The harmonic wave suppression has stability and does not change along with the change of the working state of the equipment. The harmonic current is suppressed through resonance, so that useless power during the operation of the equipment can be effectively reduced, and the power consumption of the equipment can be reduced. Resonance is generated at the frequency of the corresponding odd harmonic by the inductance-capacitance generating resonance circuit, and the odd harmonic current is consumed so that the odd harmonic current cannot enter the subsequent equipment. Further, the resonant inductor comprises a magnetic core which is not easy to saturate and a coil, wherein the coil is wound on the magnetic core, and the current density of the coil is not more than a preset value. The magnetic core material has the beneficial effects that in the selection of the magnetic material, the magnetic core material which is not easy to saturate is selected to avoid the saturation of the inductance when the equipment works. The current density of the coil does not exceed a preset value to ensure that the inductance does not overheat when