A voltage type tran‑z‑source microinverter

Abstract

The invention discloses a voltage type Tran-z-source miniature inverter which comprises a pair of coupling inductors, a filter inductor, two energy accumulation capacitors, a diode and an H-bridge inverter. The H-bridge inverter can work in a short circuit mode, an open circuit mode and an effective work mode. The voltage gain of an inverter bus is adjusted by changing the turns ratio of the coupling inductors and the short circuit mode duty ratio of the inverter bridge. Theoretically, the inverter can achieve optional voltage increasing and decreasing from zero to infinitely great. The inverter has the advantages that voltage increasing and decreasing are achieved through a pass-through state, pass-through failure of one bridge arm is avoided, and all PWM control methods are applicable to the inverter; compared with conventional inverters, the inverter has small ripples of input current and low capacitor voltage stress when large voltage gain is acquired; the inverter is applicable to distributed photovoltaic power generation occasions, with low voltage output, of micro-grid systems.

Description

technical field [0001] The invention relates to a voltage type Tran-z-source micro-inverter. Background technique [0002] In recent years, with the development of social industrialization, the demand for energy is increasing worldwide, the traditional fossil energy is facing exhaustion, and the use of fossil fuels has caused huge damage to the environment. Today, with energy depletion and environmental pollution becoming more and more serious, solar energy, as a clean and renewable energy source, has increasingly attracted widespread attention from the international community. Power supply systems and electrical devices based on solar power generation have been deeply researched and developed. Solar photovoltaic power generation has become one of the most important ways to utilize solar energy today. Photovoltaic grid-connected power generation is an important way for people to use solar energy at present. The traditional centralized photovoltaic grid-connected system is ...

AI Technical Summary

Problems solved by technology

[0003] (1) In the centralized photovoltaic grid-connected power generation system, the failure of a single inverter may cause the collapse of the entire system, and the energy generated by the photovoltaic array during device maintenance is wasted

[0004] (2) The scalability of the centralized grid-connected system is poor

[0005] (3) MPPT maximum power tracking cannot take into account each photovoltaic panel to maximize the total output power

DC modules still need centralized grid-connected inverters, and the reliability of the system is still limited by centralized inverters

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