Research On Power Generation System Of PV Integrated Module

With the development of economy, damaging to the environment by the traditional energy become increasingly severe, the research of new energy application is imperative, solar Energy among others has a very promising future. Currently, the photovoltaic power generation has a broad application prospect as a main application of solar energy, is beneficial to relieve the energy crisis, and reduce environmental pollution, moreover, the overall performance of the photovoltaic system depends on the study of some key technologies in the photovoltaic power generation systems. Therefore, this thesis make in-depth discussions from the following several aspects.First of all, the overall structure of the system is studied, and then the building integrated photovoltaic module with series/parallel generating system is built, the pros and cons of several commonly used MPPT methods is discussed.Secondly, the common DC/DC controller for photovoltaic optimizer was studied, the model of DC/DC controller is studied to select according to the actual situation. RDF algorithm and combined with a nonlinear MPPT algorithm based on lyapunov energy function is also studied for photovoltaic controller, the mathematical model of three-phase voltage source PWM rectifier was established, an the control strategy was designed.Third, the bus-voltage adjustable power optimization strategy of two levels of photovoltaic power generation system is studied based on the above, the feasibility of MPPT was explored on the basis of the two-stage type, the distributed photovoltaic power system which contains global optimizer was studied to increase overall power under the complex environment progress again.Further research for overall power characteristics of the modules in the voltage limitation and current limitation condition, the tilt limit voltage/current limit algorithm is put forward to improve the stability of the power, power performance of series branch modules of series-parallel system under the uneven illumination condition is studied, a flexible start strategy with variable voltage characteristics was designed.Fourth,a distributed generation system monitoring software was developed,which has a charastics of real-time monitoring and scheduling control, database query, data dynamic line chart display, the function such as UDP test, embedded programming is studied based on STM32F103ret6 and JN5148.Fifth,a photovoltaic optimizer based on the theoretical study was designed, which contains power circuit, drive circuit, AD sampling circuit, signal conditioning circuit, communication circuit, the CPU minimum system, Zigbee minimum system, etc.