Photovoltaic power-energy storage integrated off-grid system and multistage optimization control method thereof

Abstract

The invention provides a photovoltaic power-energy storage integrated off-grid system. The system comprises an AC bus and a DC bus which are connected via a DC / AC current converter. The DC bus is connected with a photovoltaic system and a cell energy storage system. The DC bus and the AC bus are respectively connected with a DC load and an AC load. The method comprises a photovoltaic system optimization control method, a cell energy storage system optimization control method and an electric power load optimization control method. According to the system and the control method thereof, the disadvantages that existing off-grid load power supply systems are instable in power supply quality, poor in free maintenance, low in energy conversion efficiency and low in utilization rate of clean energy can be overcome.

Description

technical field [0001] The present invention relates to a system and a method in the field of photovoltaic power generation, in particular to an off-grid system integrating photovoltaics and storage and a multi-level optimization control method thereof. Background technique [0002] Solar energy resources have no geographical restrictions, are widely distributed and inexhaustible. Solar cell modules are simple in structure, small in size, light in weight, easy to transport and install, short construction period of photovoltaic power generation system, and can be large or small according to power load capacity, convenient and flexible, easy to combine and expand; at the same time, solar The process of photovoltaic power generation has no mechanical rotating parts, does not require cooling water and does not consume fuel, and does not emit any substances including greenhouse gases. It has the characteristics of no noise, no pollution, stable and reliable performance, and long ...

AI Technical Summary

Problems solved by technology

The volatility and intermittency of these renewable energy sources lead to unstable power supply quality; off-grid power supply systems dominated by wind turbines require regular maintenance; off-grid power supply systems dominated by photovoltaics often use two-stage converters , which includes DC / DC converters and DC / AC converters, and the energy conversion efficiency is low; when the output power of photovoltaic-based off-grid power supply systems is greater than the power required by the load, non-MPPT modes are mostly used, that is, to reduce The output mode of the photovoltaic system cannot achieve the maximum utilization of clean energy

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