After entering the 21st century, the application of solar power generation technology has developed rapidly. From the perspective of power generation, the cost per watt of solar panels has been reduced from a dozen to a few pieces; From the perspective of energy storage, with the widespread application of electric vehicles, the cost of lithium batteries has decreased, and the secondary utilization of power batteries has made energy storage commercially valuable; At the same time, the advancement of power electronics technology and power device technology has attracted everyone’s attention to efficient and low-cost AC/DC conversion modules.
The household solar off grid inverter energy storage system mainly consists of solar cell modules, solar off grid inverter energy storage integrated machine, and energy storage device, providing power supply for remote areas that cannot be covered by the urban power network. It includes solar household power supply, solar street lights, and other solar power generation systems with energy storage that can work independently. In order to make the system more adaptable to commercial applications, reduce system costs, and improve reliability, various institutions have done a lot of work from circuit architecture design, system simulation, and other aspects, including:
The solar photovoltaic charging controller focuses on the efficiency of the solar charging control system and MPPT of the solar charging controller in independent photovoltaic power generation applications, and studies the synchronous step-down charging circuit that adapts to the characteristics of solar charging and the charging management strategy of the solar charger battery; Design an algorithm for maximum solar power tracking efficiency that is compatible with the working mode of an independent solar photovoltaic charging control system; Modeling the working characteristics of solar photovoltaic panels and designing an MPPT algorithm model based on disturbance observation method; And comparative research on maximum power point tracking of photovoltaic panels using switching frequency modulation methods; Research on variable step size perturbation and observation algorithms for maximum power point tracking in photovoltaics; Utilize the characteristics of solar photovoltaic panels for simulation modeling and design MPPT algorithms suitable for various photovoltaic power generation systems.
A bidirectional DC converter is studied for solar power generation, which combines two modes: charging the battery and discharging the battery externally. This includes designing a model using full bridge soft switching technology to study the circuit for DC boost conversion in solar power generation; Research on autonomous DC voltage control for multi relaxation terminal DC microgrids; Research on modeling high-frequency isolation transformers in DC bidirectional converters.
Using MATLAB software to model and analyze the working status of the full bridge bidirectional converter in various modes; Research on the implementation of a home solar off grid inverter system using a half bridge LLC boost isolation circuit; Design an improved single-phase grid connected voltage solar energy inverter using predictive current control method, with the inverter inductor current as the control object; Design an energy storage bidirectional AC/DC conversion system that adapts to the charging and discharging characteristics of energy storage batteries based on their working characteristics; To solve the ground to ground RCD problem between solar photovoltaic panels and AC mains power, research on efficient and low leakage current single-phase transformer free bidirectional solar inverters; Design a single-phase bidirectional PEV charger for V2G reactive power operation for electric vehicle charging, energy storage, and grid connected power generation applications; Research on DC bus voltage regulation technology based on DC distribution system by combining single-phase bidirectional solar inverter with mains rectification and DC bus inverter application modes; Research on Modified Model Predictive Control of Bidirectional AC/DC Converter in Energy Storage Systems Based on Lyapunov Function.
Research on the control modes of inverter control all-in-one machine in various working states, as well as the application of combining off grid and grid connected working modes for solar inverters; Conduct relevant analysis on the conversion of control objects, switching between two modes, and compatibility of two mode filters in the system; Research on distributed power supply, energy storage, and related load monitoring and protection for microgrid systems, as well as energy allocation, system control, and protection energy management strategies for microgrid power supply systems.
Research on independent power supply for solar photovoltaic household solar inverter energy storage systems, using simulation design to assist in the application of household photovoltaic energy storage power supply systems under less than ideal environmental conditions, and combining the characteristics of consumer energy consumption and household energy management with smart grid application technology to analyze the construction of a household distributed energy storage and energy optimization utilization management system.
Through the analysis of the above research, it is found that the independent off grid solar photovoltaic power supply system combining solar power charging and storage technology, DC dual conversion technology, AC/DC dual conversion technology, etc., can achieve energy supply management and microgrid power quality control of decentralized power generation systems based on renewable energy, especially solar photovoltaic power generation, which is the development path of solar off grid inverter energy storage.