Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping

A photovoltaic inverter and transformer technology, which is applied in the field of power electronics, can solve the problems of inability to completely eliminate common-mode leakage current, unbalanced heating of switching devices, and high requirements for device heat dissipation design, achieving small ripples, fewer switching times, The effect of reducing loss

Inactive Publication Date: 2014-09-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This circuit is similar to the HERIC circuit and cannot completely eliminate the common mode leakage current
In addition, its circuit structure is asymmetrical, and the working hours of the five switching transistors are not equal, resulting in unbalan

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  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping
  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping
  • Transformer-free type single-phase photovoltaic inverter with mixed voltage clamping

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Embodiment Construction

[0029] 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.

[0030] Such as figure 2 As shown, a transformerless single-phase photovoltaic inverter with voltage hybrid clamping includes: an energy storage voltage division unit, a power inverter unit, a hybrid clamp unit and a filter unit. in:

[0031]The energy storage and voltage dividing unit is used to store energy and divide the input photovoltaic direct current to extract the midpoint voltage of the photovoltaic direct current output; in this embodiment, it includes a first input capacitor C dc1 , the second input capacitor C dc2 . where the first input capacitor C dc1 The positive pole of the input DC terminal is connected to the positive pole of the input DC terminal, and the second input capacitor C dc2 The negative pole of the input DC terminal is co...

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Abstract

The invention discloses a transformer-free type single-phase photovoltaic inverter with mixed voltage clamping. The transformer-free type single-phase photovoltaic inverter comprises an energy storage voltage dividing unit, a power inversion unit, a mixed clamping unit and a filter unit. When the inverter works, with the help of six diodes, five power switches with antiparallel diodes are cooperated to enable an alternating current side to be continuous and clamp common-mode voltage of the same to be half of direct current input voltage when the inverter outputs zero level, and thereby complete elimination of the common-mode voltage is achieved, and required bus voltage is only half of a half-bridge type circuit. Meanwhile, the transformer-free type single-phase photovoltaic inverter adopts a unipolar pulse width modulation mode, so that output current is small in ripple, volume and weight of a filter are reduced, and loss of a magnetic element is reduced at the same time; the switch operates less frequently in a switching period, so that switching loss is reduced; and therefore, the inverter provided by the invention is high in output efficiency that inversion efficiency up to 98% can be obtained.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a transformerless single-phase photovoltaic inverter with voltage hybrid clamping. Background technique [0002] Nowadays, the problems of energy depletion and environmental pollution are becoming more and more serious, and the development and utilization of various new energy sources are getting more and more attention. 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 more and more rapidly in the future. [0003] As the last or only energy conversion device in the photovoltaic power generation system, the inverter's efficiency and safety performance will directl...

Claims

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Application Information

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IPC IPC(8): H02M7/537
CPCY02E10/56
Inventor 李武华胡森军罗皓泽顾云杰何湘宁
Owner ZHEJIANG UNIV
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