Quasi-Z-source inverter based single-phase photovoltaic off-grid inverter and soft switch control method thereof

A source inverter, inverter technology, applied in the field of new energy photovoltaic power generation, can solve problems such as large switching loss

Inactive Publication Date: 2015-07-22
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention is to provide a soft switching control method for single-phase photovoltaic off-grid inverters based on the above-mentioned quasi-Z source inverter, which solves the problem of single-phase photovoltaic off-grid inverters existing in the prior art. The full-bridge inverter circuit has the technical problem that the voltage of the power switch tube is not zero when it is turned on and off, resulting in large switching losses.

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  • Quasi-Z-source inverter based single-phase photovoltaic off-grid inverter and soft switch control method thereof
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  • Quasi-Z-source inverter based single-phase photovoltaic off-grid inverter and soft switch control method thereof

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] see figure 1 , a single-phase photovoltaic off-grid inverter based on a quasi-Z source inverter, whose circuit topology consists of a quasi-Z source inverter, a high-frequency transformer, a single-phase full-bridge diode rectifier circuit and a LC filter connected in sequence Composed of single-phase full-bridge inverter circuit.

[0049] The quasi-Z source inverter consists of a DC input voltage V in , its anode and inductance L 1 connected at one end, the inductance L 1 The other end of the capacitor C 2 cathode and diode D 1 The anode connection of the diode D 1 The cathode and the inductance L 2 connected at one end, the inductance L 2 The other end of the capacitor C 2 The positive connection of the diode D 1 The cathode is also connected with the capacitor C 1 The positive connection of the capacitor C 1 The negative...

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Abstract

The invention discloses a quasi-Z-source inverter based single-phase photovoltaic off-grid inverter and a soft switch control method thereof. A preceding quasi-Z-source inverter generates direct-current bus voltages with no-voltage slots, provides square-wave voltages with no-voltage slots for a succeeding single-phase full-bridge inversion circuit, and is synchronized with SPWM (sinusoidal pulse width modulation) signals, with low switching frequency, generated according to a rule sampling method to control on-off of a power switch of the single-phase full-bridge inversion circuit, rising edges and falling edges of the SPWM signals, acting on the single-phase full-bridge inversion circuit, of each switching cycle are within the no-voltage slot ranges of the square-wave voltages with the no-voltage slots, and no-voltage on-off of the succeeding single-phase full-bridge inversion circuit is achieved, so that switching loss is reduced and system efficiency is improved.

Description

technical field [0001] The invention belongs to the field of new energy photovoltaic power generation, and specifically relates to a single-phase photovoltaic off-grid inverter based on a quasi-Z source inverter, and also relates to a soft switching control method for the above-mentioned inverter. Background technique [0002] The global energy shortage and environmental crisis have become important factors restricting human development, and the development and application of clean and renewable energy has drawn more and more attention from countries all over the world. Solar energy has become one of the best choices of renewable energy because of its sufficient cleanliness, absolute safety, relatively extensive and sufficient resources, and flexibility of use. Therefore, photovoltaic power generation technology has become a research hotspot in the field of new energy. As the core link of the solar photovoltaic power generation system, the inverter is directly related to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395H02M3/335
CPCH02M3/33515H02M3/33523H02M7/53873H02M7/5395H02M1/0058Y02B70/10Y02E10/56
Inventor 孙向东刘咏妮任碧莹张琦
Owner XIAN UNIV OF TECH
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