Development Of Wind/Solar Hybrid Controller Based On MPPT

As representatives of new energy, solar/wind energy are being used increasingly. Both of them have their own advantages and disadvantages, so wind/solar hybrid power system is a good solution integrated all advantages. Compared to the PWM(Pulse Width Modulation) and switching technology, the maximum power point tracking(abbreviate MPPT) technology has its advantages in energy utilization for the design method of solar/wind controller. The wind/solar hybrid controller based on MPPT is developed combining CAN field bus technology and maximum power point tracking technology, and the controller's capacity can be flexibly combined to meet actual demand for new energy power system by module stacking. The content of the thesis mainly includes the following aspects:1) The design of the system is proposed according to design requirements through studying and analyzing the principle and realization method about wind/solar hybrid power system. The whole control system is composed of two-level architecture which consists of master module and power modules. Master module is used for the display of relevant parameters and the query of historical data; power modules are used for tracking and achieving maximum power point; the communication is realized between them by CAN bus.2) This paper proposes a method that can quickly achieve the maximum power point tracking of solar and wind energy by analysing the principle and method of the maximum power point tracking, selecting and optimizing.3) The circuit design is researched with related topics on switch power supply. Finally, the solution is to select full-bridge circuit topology belonging to isolated circuit by analyzing the topology of the DC chopper, comparing the advantages and disadvantages of various choppers, and taking into account of their applicable scope and the relevant requirements of design.4) The selected main circuit is designed. The paper gives the selection of components' parameters in the main circuit and related calculation methods, such as the transformer's design, output filter circuit's design, the selection of MOSFET switching devices and diodes, the PWM control circuit and so on. 5) The schematic design of controller has been completed including master module and power module, and the software of control system is programmed and debugged, so the result shows that the design scheme is feasible.