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Power grid side harmonic current suppression method for non-electrolytic capacitor compressor controller

A technology of electrolytic capacitors and harmonic currents, applied in motor generator control, electronic commutation motor control, motor control, etc., to achieve the effects of improving rapidity, suppressing resonance, and reducing overshoot

Active Publication Date: 2022-01-28
ZHEJIANG UNIV +1
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Problems solved by technology

[0006] Aiming at the problems existing in the above-mentioned technologies, the present invention provides a method for suppressing harmonic currents on the power grid side of an electrolytic capacitor compressor controller, which can indirectly calculate the differential amount of the power grid current without additional collection of power grid current, avoiding Noise amplification problem caused by direct differentiation

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  • Power grid side harmonic current suppression method for non-electrolytic capacitor compressor controller
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  • Power grid side harmonic current suppression method for non-electrolytic capacitor compressor controller

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Embodiment Construction

[0046] In order to describe the present invention more specifically, the technology of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0047] First, if figure 1 Shown is the main circuit diagram of the compressor controller without electrolytic capacitors. The main structures included are: uncontrolled rectification unit, filter inductor, film capacitor, three-phase inverter and permanent magnet compressor. In the figure i g is the grid-side input current, i inv Input current for the inverter, i c is the DC bus side current, and the three satisfy i g = i inv + i c Relationship. Since there is no large-capacity electrolytic capacitor on the DC bus side, the bus voltage will have twice the power frequency pulsation, and the resi...

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Abstract

The invention discloses a power grid side harmonic current suppression method for a non-electrolytic capacitor compressor controller, and belongs to the field of variable frequency air conditioner driving. According to the method, a power grid side voltage and a direct-current bus voltage serve as input quantities, a differential component of a power grid current is indirectly obtained, and a current compensation quantity is obtained through a feed-forward compensation module to compensate a q-axis current of a compressor. The feed-forward compensation module comprises a discretization unit, a linear adjustment unit and an amplitude limiting unit. Aiming at the large fluctuation change of the q-axis current reference value after the compensation is applied, an anti-saturation integral estimation regulator is adopted to effectively control the q-axis current, so that the power grid side input current is indirectly controlled. The method provided by the invention does not need to additionally collect power grid current, is easy to engineering realization, and can effectively improve power grid current distortion and suppress high-frequency harmonic current, so that the current meets the harmonic standard.

Description

technical field [0001] The invention relates to the field of frequency conversion air conditioner drives, in particular to a method for suppressing harmonic currents at the power grid side of a compressor controller without an electrolytic capacitor. Background technique [0002] As energy issues get more and more attention, the energy saving of motor system is one of the top ten key energy saving projects in my country, and the research and development of energy-saving and high-efficiency inverter air conditioners is an important measure to vigorously promote the project. Because permanent magnet synchronous motors have high efficiency, high power density and wide range of speed regulation performance, a series of compressors mainly built-in permanent magnet synchronous motors are widely used in the field of inverter air conditioners. [0003] The traditional permanent magnet compressor controller needs a large-capacity electrolytic capacitor to maintain the stability of th...

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Application Information

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IPC IPC(8): H02P29/50H02P21/22H02P21/13H02P21/18H02P27/06
CPCH02P29/50H02P21/22H02P21/13H02P21/18H02P27/06
Inventor 杨家强古汤汤黄万奔邓鎔峰卓森庆李发顺游剑波薄传海白韡高健许真鑫
Owner ZHEJIANG UNIV
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