Design Of Hibrid Household Photovoltaic Inverter

PV is the main force of new energy supply line.Inverter is an important part of new energy power generation.Photovoltaic inverter is the key equipment of photovoltaic power supply,the new energy source,the actual converter of the power.Photovoltaic inverter with its simple installation,easy access to energy and other characteristics,in the new energy market in great splendor,and promote the rapid development of photovoltaic inverter market.A single inverter can't overcome the limitations of wind,light,tidal,geothermal and other intermittent energy.To meet the changing needs of the market,to overcome the shortcomings of new energy.The study of hybrid inverter is one of the most important research directions.Hybrid photovoltaic inverter is a new energy applied to the practice of the converter device,nor is it limited to the converter device,it is a new generation of energy management.Although the new energy resources,large reserves,but its unique intermittent and unstable,not easy to efficient used to engineering practice.Based on the hybrid inverter systems,focusing on the analysis and design in the structure of the system,system analysis and optimization of operation mode,control strategy and involves the introduction and improvement of the circuit parameters design of control system stability analysis.First of all,the paper analyzes the structure principle of the inverter system,mentioned in the literature,through the literature search and market investigation,analyzes its structural characteristics and analyzes the advantages and disadvantages of the structure under the specific conditions.An improved structure model based on DC bus structure model is proposed for the off grid planning.Analysis of the structure model for the advantages of non-plan from the network response mechanism and structure of the establishment of the proposed operating mode of two-way fixed bus voltage based on the improved system of power grid changes brought about fluctuations,and the use of Simulink to build simulation model,to verify the feasibility of operation mode;second,for modeling topology the structure of DC/DC function module circuit,using the Matlab tool platform,stability analysis involves specific parameters of the system,according to the results of selective join PID stability control link in the control link,through the Simulink simulation,verification of battery charge discharge of constant current and constant voltage control based on;third,according to the analysis of the existing literature retrieval module control strategy of grid connected inverter the function,introduced the voltage vector control and direct power control technology and virtual flux ladder,This paper analyzes the principle of the grid connected control strategy in detail,and puts forward the common shortcomings of each control strategy in the delay of sampling and control loop delay.Based on this,the improved scheme based on Kalman filter is proposed to optimize the control performance.Finally,based on the above theory,the experimental platform of 10kW hybrid inverter is designed and built.Through the experiment and simulation platform and the performance index of the hybrid inverter test:bidirectional DC/DC charge discharge control module;the control voltage stability of DC bus;non-specific plan from the network under the condition of stability control was studied under different working conditions.Under the condition of off grid operation,the stability of two stage DC bus is improved.The feasibility of the scheme is verified by analyzing the experimental data.