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Method for suppressing secondary current ripples based on equivalent zero impedance of active negative capacitor

A secondary current, zero-impedance technology, applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the problems of power supply damage and power supply service life reduction, and achieve small impact on system efficiency, simple control, The effect of extended suppression

Active Publication Date: 2021-01-08
厦门市爱维达电子有限公司
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Problems solved by technology

However, as a cascaded system, in order to suppress the secondary ripple on the busbar of the intermediate stage, the pulsating power is transferred to the power supply by a large margin, resulting in a reduction in the service life of the power supply. Only the stability of the busbar voltage is considered, and the low-frequency ripple is not fundamentally solved. Damage caused by waves to the power supply

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  • Method for suppressing secondary current ripples based on equivalent zero impedance of active negative capacitor
  • Method for suppressing secondary current ripples based on equivalent zero impedance of active negative capacitor
  • Method for suppressing secondary current ripples based on equivalent zero impedance of active negative capacitor

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[0025] Below in conjunction with accompanying drawing and specific embodiment, further set forth the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0026] refer to figure 1 and Figure 4 As shown, a method for suppressing secondary current ripple based on the equivalent zero impedance of active negative capacitance is applied to an inverter including an equivalent zero impedance circuit, which includes a capacitor connected in series C and active negative capacitance C vri , the equivalent zero-impedance circuit is connected to the DC side of the inverter. The active negative capacitance C vri Including the first...

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Abstract

The invention discloses a method for suppressing secondary current ripples based on equivalent zero impedance of an active negative capacitor, the method is applied to an equivalent zero impedance circuit, the equivalent zero impedance circuit comprises a capacitor C and an active negative capacitor Crvi which are connected in series, and the equivalent zero impedance circuit is connected to the direct current side of an inverter circuit; and the active negative capacitor Crvi comprises a pair of complementary conduction switching tubes Sa and Sa, an inductor Lr and a capacitor Cr. According to the secondary ripple suppression method, secondary current ripples are absorbed on the direct-current side of the inverter, so that secondary pulsation energy is transmitted between the direct-current side of the inverter and the equivalent zero-impedance circuit, the influence on the alternating-current side is small, the equivalent zero-impedance circuit can cope with current harmonics with different frequencies, and the universality is high. Meanwhile, the equivalent zero-impedance circuit has a good secondary ripple suppression effect and a fast dynamic response in the operation process.The power density of the system can be improved, the service life of the power supply is prolonged, and the circuit stability is enhanced.

Description

technical field [0001] The invention relates to the technical field of power quality, in particular to a method for suppressing secondary current ripple based on equivalent zero impedance of active negative capacitance. Background technique [0002] Due to the influence of the sinusoidal voltage and current on the AC side, the output power of the inverter presents a pulsation that is twice the fundamental frequency. Feedback to the DC side will cause a large secondary ripple in the power supply current or voltage. In the case that the current mobile power supply is mostly in the regulated output mode, the power supply current will contain a large number of low-frequency ripples, especially the secondary current ripple, which will greatly reduce the stability and life of the power supply. [0003] Currently effective secondary ripple suppression methods can be divided into two categories. The first category is realized through control without adding additional circuits or de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14H02M7/5387
CPCH02M1/14H02M7/53871H02M1/0058Y02B70/10
Inventor 何良宗林智乐
Owner 厦门市爱维达电子有限公司
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