Energy-saving type cascade multilevel photovoltaic grid-connected generating control system

Abstract

The invention discloses an energy-saving type cascade multilevel photovoltaic grid-connected generating control system comprising an energy-saving cascade multilevel photovoltaic generating inverter, a controller and a power grid, wherein the multilevel inverter consists of 3n energy-saving type photovoltaic generating modules, wherein n modules are connected in series into one phase of a three-phase inverter; and the single-stage power of each module is converted to realize the buck-boost, the inverting and energy saving and adapt to the wide-range change of the battery voltage with high reliability. 3n photovoltaic cells and energy-saving cells are distributed on 3n modules; the generation of each module is independently controlled, thereby realizing the distributed maximum power track, collecting solar energy to the maximum extent, realizing high efficiency and avoiding the problems of power loss and hot spot caused by the local shade generated when the photovoltaic cells are connected in series; and the invention can flexibly control the stable power of a feeder grid of the multilevel inverter and achieve the functions of reactive power consumption, the power pitch peak control and the like, has the advantage of multilevel inversion and low output harmonic voltage and is suitable for high-voltage, high-power and transformer-free grid connection.

Description

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AI Technical Summary

Benefits of technology

This new technology allows multiple individual panels or batteries (called modules), which work together like one unit, collecting more sunlight than any previous method alone could. By distributing these modules throughout an array of cells, this technology enables flexible adjustment over how much it receives light from different angles on the surface during daytime hours while still maintaining optimal performance at nightfall time when there're no cloudy conditions. Additionally, the use of modular converters reduces interference between components and improves overall efficiency compared to traditional methods such as direct current injection systems that require expensive equipment. Overall, this innovative solution provides improved efficient electricity production and better management of electrical grids.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and functionality of conventional photovoltages without requiring expensive equipment components like boosters or inductors. Additionally, current methods require multiple stages of converting from AC into direct currents before being converted back again, leading to increased size and weight while reducing efficiency due to heat dissipations over longer periods.

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