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Zero-crossing distortion suppression method of dual-buck grid-connected inverter

A zero-crossing distortion and inverter technology, which is applied in the direction of converting irreversible DC power input to AC power output, can solve problems such as affecting the quality of incoming network current, and achieve the effect of solving zero-crossing distortion.

Inactive Publication Date: 2013-12-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

The three-phase current feedback values ​​participate in the coordinate transformation at the same time and affect each other. The distortion of a certain phase at the zero-crossing point will cause the distortion of the other two-phase currents at this moment, which seriously affects the quality of the incoming current.

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  • Zero-crossing distortion suppression method of dual-buck grid-connected inverter
  • Zero-crossing distortion suppression method of dual-buck grid-connected inverter
  • Zero-crossing distortion suppression method of dual-buck grid-connected inverter

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Embodiment Construction

[0034] The technical solution of the invention is described in detail below in conjunction with the accompanying drawings:

[0035] like figure 1 As shown in the figure, a zero-crossing distortion suppression method for a double-buck grid-connected inverter is based on a system including a double-buck topology unit connected between a power generation device and a power grid, and an inverter connected with the double-buck topology unit. inverter control unit. The inverter control unit includes a current loop unit for controlling the grid-connected current of the inverter, an SVPWM unit connected with the current loop unit, and a half-cycle drive signal shielding unit connected with the SVPWM unit.

[0036] figure 2 It is a schematic diagram of the dual step-down topology unit according to the present invention. The first to sixth power tubes S 1 -S 6 is a, b, c three-phase bridge arm power tube, D 1 -D 6 are the external first to sixth fast recovery diodes, P is the po...

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Abstract

The invention discloses a zero-crossing distortion suppression method of a dual-buck grid-connected inverter, and belongs to the technical field of power conversion. According to the method, a half-cycle SVPWM control method with ripple current negative feedback is led in through control on a three-phase dual-buck grid-connected inverter topology, negative feedback is carried out on a ripple current component of access currents, an amplitude value of the zero-passing portion of the currents is changed, shielding of half-cycle drive signals is achieved through a logical operation circuit, and the zero-crossing distortion problem of the dual-buck grid-connected inverter is solved on the basis that the dual-buck grid-connected inverter is high in efficiency and reliability is guaranteed.

Description

technical field [0001] The invention discloses a zero-crossing distortion suppression method for a double-step-down grid-connected inverter, which belongs to the technical field of electric energy conversion. Background technique [0002] Three-phase grid-connected inverters are widely used in new energy power generation, electric vehicles and other fields. The dual buck topology has been used more and more because of its advantages such as no bridge arm shoot-through problem and small reverse recovery loss of the freewheeling diode. Therefore, it is of great significance to study the three-phase double-buck grid-connected inverter and its control method. Applying the double buck topology to the three-phase DC / AC inverter can overcome the straight-through problem of the bridge topology, avoid the dead zone effect, reduce the harmonic content of the grid current, reduce the size and weight of the filter, and improve the converter current. device efficiency. [0003] The ma...

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Application Information

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IPC IPC(8): H02M7/48
Inventor 郑昕昕肖岚田洋天姚营盘潘小刚夏建中吕鸿
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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