Active power decoupling type single-phase grid-connected converter based on flyback circuit

A source power and decoupling technology, applied in the field of active power decoupling single-phase grid-connected converters, can solve the problem of large capacitance value, affecting the life and stability of grid-connected converters, and limited service life of electrolytic capacitors, etc. problems, to achieve the effect of prolonging the service life

Inactive Publication Date: 2018-06-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the frequency of the power ripple is only twice the power frequency, the required capacitor value is relatively large, and the ser

Method used

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  • Active power decoupling type single-phase grid-connected converter based on flyback circuit
  • Active power decoupling type single-phase grid-connected converter based on flyback circuit
  • Active power decoupling type single-phase grid-connected converter based on flyback circuit

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0016] attached figure 1 It is a main circuit of an active power decoupling type single-phase grid-connected converter based on a flyback circuit. by the DC power supply V i , Input capacitor 1, primary switch tube 2, isolation transformer 3, secondary switch tube 4, filter circuit 5, grid 6 and active power decoupling circuit 7. S p is the primary switch tube, C i is the input capacitance, S x is the decoupling switch tube, D x1 、D x2 is the decoupling diode, C x is the decoupling capacitor, T is the isolation transformer, S s1 , S s2 is the secondary switch tube, L f is the output filter inductor, C f is the output filter capacitor. Since the isolation transformer is similar to an ideal transformer with a specific magnetizing inductance, for the convenience of analysis, the attached figure 1 Equivalent to attached figure 2 circuit shown.

[0017]...

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Abstract

The invention discloses an active power decoupling type single-phase grid-connected converter based on a flyback circuit. The main circuit typology of the active power decoupling type single-phase grid-connected converter comprises a DC power supply, an input capacitor, a primary side switching tube, an isolation transformer, a secondary side switching tube, a filtering circuit, a power grid, andan active power decoupling circuit. According to the active power decoupling type single-phase grid-connected converter, the active power decoupling circuit composed of a decoupling switching tube, adecoupling diode and a decoupling capacitor is added to an input side of the converter, the low-frequency power pulsation at an input side of the DC power supply caused by AC output power is effectively decoupled, grid connection can be realized, and the long service life of the converter is guaranteed.

Description

technical field [0001] The invention relates to an active power decoupling type single-phase grid-connected converter based on a flyback circuit, which belongs to an isolated grid-connected converter, and uses an added active power decoupling circuit to realize power pulsation on the DC input side decoupling. Background technique [0002] In the new energy power generation system, the output power of the grid-connected converter contains power ripple twice the frequency of the grid, while the input power is controlled to be a constant power. The imbalance between input power and output power is usually solved by paralleling large electrolytic capacitance to solve. Since the frequency of the power ripple is only twice the power frequency, the required capacitor value is relatively large, and the service life of the electrolytic capacitor is also limited, which seriously affects the life and stability of the grid-connected converter. For this reason, the method of decoupling...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 陈仲袁涛李梦南许亚明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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