Research On Small Household Energy Storage Type Photovoltaic Power Control System

With the rapid development of the world the process of industrialization, energy shortage and environmental pollution problems have become increasingly prominent. As the world’s largest developing country, China’s energy and environmental problems are more severe, with photovoltaic power generation system as the representative of clean energy instead of fossil fuel-based energy system is imperative.Based on the analysis based photovoltaic industry and related control technology of the status quo, a comprehensive comparison of traditional grid-systems and the advantages and disadvantages of off-grid systems, off-grid is designed both to work independently, but also to run the network and the surplus power supply network small household photovoltaic power generation energy storage system.In this paper, a detailed study by the photovoltaic cell, Boost circuit, bidirectional DC-DC circuit, inverter circuit and batteries. The first is the working principle of photovoltaic cells and model to do the analysis and simulation, and the maximum power point tracking study according to their output characteristics, shortcomings of traditional MPPT algorithm to track slow, low efficiency, an improved algorithm, and its simulation verification. Then it analyzes the topology and operating principle of Boost circuit and bi-directional DC-DC circuit, and battery energy storage system links do control design. In this paper, choose single-phase full-bridge inverter circuit as the main circuit of the inverter circuit is determined using SPWM modulation, depending on the inverter off-grid and grid work under the control of the state, namely the control design, and grid work islanding protection were studied, more passive protection and active protection of the advantages and disadvantages of using AFD as an anti-islanding algorithm.Depending on the theory of this study was designed to 5kW small household photovoltaic power generation energy storage system hardware circuit, calculation and selection contains device parameters, while part of the auxiliary circuit design, including the signal sampling, power tube drives. Control chip selects TMS320F28335, and its port allocation.Finally, this study was small household photovoltaic system with storage-related simulation, simulation using MATLAB and the results were analyzed, and applied PVsyst the entire PV system operation simulation results show that small household energy storage photovoltaic power generation system to meet the system design requirements, and have some practical significance.