Research On The Application Of Grid-connected Photovoltaic System In Ship Power System

With the increasingly serious environmental pollution problems caused by shipping.Introduced new energy into the ship power system is one of the most effectively ways to solve the pollution from ships.This paper study how to improve anti-jamming ability of photovoltaic grid-connected inverter,even though changeing the voltage amplitude and frequency of the ship power grid.In order to simulate the operation conditions of photovoltaic grid-connected system in the ship power system more accurately,establish a parameter adjustable photovoltaic cells model,and use the MPPT(Maximum Power Point Tracking)technology to complete the tracking of photovoltaic maximum power point.Designing a 2kW s single-phase photovoltaic grid-connected system,which using voltage feedforward compensation method to offset the voltage of the system disturbance,and using QPR(Quasi Proportional Resonant)control strategies instead of traditional PI(Proportional Integral)control method,solved the shortcoming of PI control is not able to accurately track the sinusoidal signal.In order to expand the application range of the photo-voltaic grid connected system in the ship power system,design a 12 kW’s three-phase photovoltaic grid-connected system,using the QPR control strategy directly control sinusoidal current signal,it has solved the shortcoming of the traditional PI control need dq coordinate transformation and decoupling can control the grid connected current.And the use of LCL filter instead of single L filter,solving the disadvantage of the single L filter only use increasing the inductance value to reduce the current harmonic.Studying the LCL parameter design of filter and use the active damping solved the problem of resonance of LCL filter.The active power and reactive power of PV grid connected system are controlled by using the coordinate transformation to decouple the useful power and reactive power of PV system.In the Matlab simulation environment,a complete simulation model of the grid connected photovoltaic power generation system is built,and the simulation experiment is carried out.