Harmonic detection method, device, inverter and storage medium
A harmonic detection and harmonic component technology, which is applied in the field of frequency converters, can solve problems such as difficulty in configuring processors, high processor load, and cumbersome calculation process, and achieve less sampling, low processor load, and simple calculation process. Effect
Active Publication Date: 2022-04-29
HEFEI MIDEA HEATING & VENTILATING EQUIP +1
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[0004] The embodiment of the present application provides a harmonic detection method, device, frequency converter, and storage medium to solve the Fourier transform method used in the prior art for harmonic detection of the DC bus voltage. The processing process needs to rely on a large number of The sampling signal and the calculation process are cumbersome, resulting in excessive load on the processor, and it is difficult to configure a suitable processor.
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[0030] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
[0031] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude one or more other Presence or addition of features, wholes, steps, operations, elements, components and / or collections thereof.
[0032] It should...
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This application is applicable to the field of frequency converter technology, and provides a harmonic detection method, device, frequency converter and storage medium, by obtaining the ripple component of the DC bus voltage; according to the ripple component, obtaining the harmonic component of the DC bus voltage; according to Harmonic component, obtain the quadrature component of the harmonic component; obtain the characteristic parameters of the harmonic component according to the quadrature component, and the characteristic parameter includes the phase; obtain the voltage amplitude of the harmonic component according to the phase of the quadrature component and the harmonic component And output, can effectively detect the voltage amplitude of the harmonic component in the DC bus voltage according to the sampled DC bus voltage, the sampling amount is small and the calculation process is simple, so that the processor load is low, and it is easy to configure a suitable processor.
Description
technical field [0001] The application belongs to the technical field of frequency converter (Variable-frequency Drive, VFD), and in particular relates to a harmonic detection method, device, frequency converter and storage medium. Background technique [0002] A typical structure of a frequency converter applied to a three-phase AC motor is an AC-DC-AC frequency conversion system composed of a rectifier, a DC bus capacitor and an inverter. The DC bus capacitor plays the role of storing electric energy to provide voltage and filter harmonics in this system. The voltage of the DC bus capacitor can reflect the operating conditions of the power grid, capacitors and loads, so it can be used as an important indicator for evaluating the operating status of the system. [0003] In the prior art, for the harmonic detection method of the DC bus voltage, the sampling signal of the DC bus voltage is usually mathematically transformed by the Fourier transform method. The processing pro...
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IPC IPC(8): G01R23/165
CPCG01R23/165G01R31/42H02M1/12G01R23/167H02M5/458H02M1/14H02M1/0009H02J1/02
Inventor 陈俊桦洪伟鸿王豪浩周超彭国彬钟明胜
Owner HEFEI MIDEA HEATING & VENTILATING EQUIP