Dual-Sepic buck-boost output parallel combined inverter

Abstract

The invention discloses a dual-Sepic buck-boost output parallel combined inverter, which comprises two buck-boost Speic DC / DC circuits that are connected in parallel at the output side, and which can realize the buck-boost single-phase inversion and expand the buck-boost single-phase inversion in a three-phase system to realize the three-phase inversion output. The inverter has the basic function of realizing buck-boost inversion; when the direct-current voltage at the input side is lower or the change range is larger, the dual-Sepic buck-boost output parallel combined inverter still can realize the inversion function; two high-frequency switching tubes adopt a non-complementary work manner and do not work simultaneously, therefore, the bridge through problem is prevented; the circuit parameter designing principle can be designed according to the mature direct-current Sepic converter designing principle; the inductive current works under the continuous state and reduces the influence of the EMI (Electro-Magnetic interference). The invention is mainly applied to the field of renewable energy source or new energy source generation with lower direct-current voltage, faster change or larger fluctuation range, such as photovoltaic power generation, a small Wind turbine generator system, fuel cell generation, and the like.

Description

technical field [0001] The invention is an inverter in an electric energy conversion device, especially in single-phase or multi-phase inverter applications that can boost or lower voltage. Background technique [0002] With the increasing depletion of traditional energy and the destruction of the ecological environment, it is becoming increasingly important to seek environmentally friendly renewable energy and new energy. Solar energy, wind energy, and biomass power generation technologies are the core technologies to cope with the energy crisis and achieve sustainable development. Inverters are an integral part of this type of power generation technology. Compared with traditional thermal and hydroelectric power generation technologies, the installed capacity of renewable energy power generation devices is small, and the output power fluctuates with the fluctuation of natural conditions, showing randomness. The specific performance is the variation range of the DC voltage...

AI Technical Summary

Problems solved by technology

Another solution is to process a frequency step-up transformer after the inverter to increase the AC voltage on the output side. Obviously, the addition of a transformer will increase the system cost and affect the overall conversion efficiency.

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