Research On Photovoltaic Panels Connected In Series To 18kV Of Grid-connected Photovoltaic System

In recent years,due to the shortage of traditional energy and environmental pollution,people are constantly seeking new clean energy to replace fossil energy.Solar energy is one of the alternative energy sources.As a big country of energy consumption,our country there is an upward trend in energy consumption.In order to develop new energy,the high efficiency utilization of energy are put forward.The main purpose of this research is to improve the efficiency of photovoltaic power generation systems through ascension to 18 k V photovoltaic panels in series voltage.(1)We can analyze the relationship between PV output voltage/current and temperature/light intensity by simulation.Maximum power point tracking of photovoltaic panel output power is carried out using conductance increment method and verified the effect of maximum power tracking.(2)In order to implement the interconnection of photovoltaic power generation system,we will give the inverter control technology based on rotating coordinate system.Through theoretical derivation and simulation validation,the final simulation of voltage and current waveform is consistent with the theoretical calculation of wave and the correctness of the design is proved.The current control technology of inverter control strategy using PI control technology can track the ac current effectively.This experiment adopts the Pro MPPT control strategy.The first level can realize photovoltaic panels’ output maximum power control through MPPT controller.The last level can realize a constant dc bus voltage control and the ac current control through inverter.Finally,this system can realize MPPT and inverter coordinated control.This paper aim to validate the feasibility of photovoltaic panels in series voltage up to 18 kV and improve the efficiency of the practical significance.So we will make 29 photovoltaic panels in series into photovoltaic panels string and make 20 string photovoltaic panels together to get 18 kV voltage dc grid side.Finally through the simulation of the various components and the conductor loss,and compared with traditional photovoltaic power generation systems,we can get that photovoltaic panels in series voltage up to 18 kV can improve the efficiency of photovoltaic power generation systems significantly.