Single-phase inverter and DC bus ripple suppression method thereof

A single-phase inverter and DC bus technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of limited life and increased capacity of electrolytic capacitors

Active Publication Date: 2016-03-23
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the DC bus capacitor C dc It is impossible to increase the capacity indefinitely, and the existing technology generally uses electrolytic capacitors as the DC bus capacitor C dc , and the life of electrolytic capacitors is very limited, so a new DC bus ripple suppression solution is urgently needed

Method used

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  • Single-phase inverter and DC bus ripple suppression method thereof
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  • Single-phase inverter and DC bus ripple suppression method thereof

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Embodiment Construction

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0066] The embodiment of the invention discloses a DC bus ripple suppression method, which is applied to a single-phase inverter with an external hybrid capacitor on the DC bus, so as to realize the DC bus without increasing the DC bus capacitance C dc Under the premise of the capacitance value, the ripple of the DC bus is suppressed. Such as figure 2 As shown, the single-phase inverter includes: a single-phase inverter circuit 100, and a hybrid capacitor 20...

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Abstract

The application discloses a single-phase inverter and a DC bus ripple suppression method thereof. The method is applied to the single-phase inverter externally connected with hybrid capacitors on a DC bus. The hybrid capacitors include a compensation capacitor, a DC bus capacitor, and a bidirectional conversion circuit of which one end is connected in parallel with the compensation capacitor and the other end is connected in parallel with the DC bus capacitor. The method comprises the steps that an instruction value of the output voltage instantaneous value of the compensation capacitor is generated; and pulse width modulation is performed on the bidirectional conversion circuit so that the compensation capacitor is enabled to output according to the instruction value. DC bus ripple can be suppressed without increasing the capacitance value of the DC bus capacitor.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a single-phase inverter and a method for suppressing ripple of a DC bus. Background technique [0002] For a single-phase inverter, its instantaneous output power mainly pulsates at twice the frequency of the output voltage, which will cause serious secondary ripples on the DC bus. The most simple and direct way to suppress the DC bus ripple is to increase the DC bus capacitor C dc The capacity of the corresponding single-phase inverter topology is as follows figure 1 shown. But the DC bus capacitor C dc It is impossible to increase the capacity indefinitely, and the existing technology generally uses electrolytic capacitors as the DC bus capacitor C dc , and the life of electrolytic capacitors is very limited, so a new DC bus ripple suppression solution is urgently needed. Contents of the invention [0003] In view of this, the present invention provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
CPCH02M1/143
Inventor 刘宝其肖永利薛丽英王宝臣宗艳玲
Owner SUNGROW POWER SUPPLY CO LTD
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