Modular photovoltaic power electronic converter based on coupling inductance

Abstract

The invention relates to a modular photovoltaic power electronic converter based on coupling inductance, which comprises a solar-cell panel, a maximum power point tracking circuit, a photovoltaic converter, load and a storage battery. The photovoltaic converter is formed by a direct current / direct current (DC / DC) phase shifted full bridge and a direct current / alternating current (DC / AC) inversion bridge. The coupling inductance is introduced to the voltage-multiplying rectification side of a DC / DC phase shifted full bridge circuit. The coupling inductance can not only quickly reduce primary side circulation current through the coupling effect to reduce duty ratio loss accordingly but also ensure the filtering effect of power frequency half-sinusoid voltage modulated by sinusoidal pulse width modulation (SPWM) and output by the voltage-multiplying rectification side of the DC / DC phase shifted full bridge circuit and can achieve a leading arm zero voltage switch of a phase shifted full bridge circuit. Alternating current electricity is output at the DC / AC grade through the power frequency inversion bridge. The converter is simple in structure, low in cost, high in efficiency, easy to achieve and capable of being used in not only a photovoltaic system but also other new energy systems.

Description

technical field [0001] The invention relates to a power electronic converter, which is a modular photovoltaic power electronic converter based on a coupled inductance that places a coupled inductance on the side of a voltage doubler rectifier to realize functions such as filtering, switching, and reducing duty cycle loss. It can be used in modules In photovoltaic systems, it can also be used in other new energy inverter links. Background technique [0002] New energy photovoltaic power generation technology is an emerging industry that is currently receiving much attention and vigorously developing. In order to maximize the efficiency of solar panels and meet the requirements of flexible design of photovoltaic power generation products, more and more attention has been paid to modular photovoltaic power generation systems, which has become one of the development trends of photovoltaic power generation technology. [0003] In the modular photovoltaic power generation system,...

AI Technical Summary

Problems solved by technology

At present, the phase-shifted full-bridge circuit is the most widely used DC / DC converter. It has a simple structure and high work efficiency, but it has the problem of duty cycle loss.

In order to solve this problem, the existing improvement method is to add auxiliary circuits such as switch tubes, but in this way the structure is relatively complicated, the stability of the system is reduced, and the complexity of the control method is increased, which not only increases the cost , and it is very difficult to implement

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