Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof

A photovoltaic inverter, non-isolated technology, applied in the field of power electronics, can solve the problems of short life, no buck-boost function, low reliability, etc. Effect

Active Publication Date: 2016-05-04
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In transformerless inverters, some inverter topologies have solved the common mode voltage constant problem, but at the same time, there are other problems, such as the inclusion of electrolytic capacitors in the structure, low reliability, short life, and no buck-boost Function etc.

Method used

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  • Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof
  • Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof
  • Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof

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Embodiment Construction

[0028] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] A single-stage non-isolated Buck-Boost three-phase photovoltaic inverter, such as figure 2 As shown, the inverter is composed of nine switch tubes, eight diodes, five inductors and three filter capacitors; the eighth switch tube S 8 The collector of the DC bus is connected to the "+" terminal, and the eighth switching tube S 8 The emitter of the seventh diode VD 7 The cathode, the first DC inductance L dc1 One end of the connection; the ninth switching tube S 9 The emitter of the DC bus is connected to the "-" terminal, and the ninth switching tube S 9 collector of the eighth diode VD 8 The anode of the second DC inductance L dc2 One end of the connection; the seventh diode VD 7 The anode of the eighth diode VD 8 The cathode connection; th...

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Abstract

The invention discloses a single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and a control method thereof. The inverter is evolved from a Buck-Boost circuit and an inverter circuit and is composed of nine switch tubes, eight diodes, five inductors and three filter capacitors. The single-stage non-isolated Buck-Boost three-phase photovoltaic inverter disclosed by the invention has the beneficial effects that the inverter system is not subjected to a dead band problem or a short circuit fault, so the reliability is improved; the inverter has boost and buck functions, so the application range thereof is expanded; the inverter needs no electrolytic capacitor, so the system reliability is high and the service life is long; the inverter is of a single-stage structure, so the circuit structure is simple, and the inversion efficiency is high; and the control method of the inverter adopts carrier modulation, so the structure of a switching signal generation circuit is simple, and meanwhile the consistency of a common-mode voltage of the system can be guaranteed to effectively inhibit common-mode current.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a single-stage non-isolated Buck-Boost three-phase photovoltaic inverter for eliminating common-mode current and a control method thereof, and is suitable for three-phase inverter application occasions. Background technique [0002] Energy is the material basis for the survival and development of human beings. The limited and extensive exploitation and utilization of fossil energy have led to the increasingly serious problem of energy shortage, and at the same time caused the worsening of environmental pollution. Solar energy is currently one of the cleanest and most promising renewable energy sources for large-scale development and utilization, and its photovoltaic utilization has attracted widespread attention from all over the world. Solar photovoltaic power generation is the main development trend of solar photovoltaic utilization, and it will develop mo...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/32H02J3/38
CPCH02J3/383H02M1/32H02M7/53873H02M1/325Y02E10/56
Inventor 王立乔董子亮张晓飞
Owner YANSHAN UNIV
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