The Research And Design On Pv Power Applied System Based On MPPT

Nowadays, with the increasing burden on energy exhaustion and environment pollution, as a cleanly and renewable energy, Solar Energy has became a hotspot of the whole world. At the same time, the technique of the PV (Photovoltaic) conversion has come into the applied level on a large scale. In the future, the application of the PV will has a exciting status. It is significant to research on improving the conversion efficiency of PV from its Volt-Ampere Characteristics.This paper is intended to develop a variational MPPT (Maximum Power point Tracking) step-up Perturb&Observe algorithm for a DC/DC converter to obtain maximum power from PV array despite of the fluctuations of the array temperature and irradiation. In the end of the paper, the idea and design of advanced MPPT fuzzy controller is put forward. The system software consists of two portions, one of them which calculates Maximum Power Point (P_max) current by incremental conductance algorithm is named "current loop", and the other one voltage loop adjust the output DC voltage by the PWM method. The voltage loop is actualized by the DC/DC buck-boost converter and the discrete incremental PID algorithm to controlthe output voltage. Simultaneously, we have maked use of the technique of the Soft-Swithing to enhance the efficiency of the conversion. For testing the effect of converter, we establish the dynamic simulated model with PSB(Power System Blockset) in the Matlab, a relative perfect simulated result is obtained. For managing the PV system effectively, reassuring the reliability and availability of the power supply system, we design the power supervise and control system. It can measure the PV data at any moment, especially has referenced value on PV grid-connected system.The results of the design: A PV MPPT control unit based on double MCU and its software of MPPT algorithm; A asymmetrical class D buck-boost converter with the control methods of PWM (Pulse-Width-Modulation); For usage of storage cells as secondary power supply, the switch circuit is designed for the pile; On the large scale situation of PV application, we design power Supervise&Control communication network based on CAN field bus.