The application of solar photovoltaic poer genernation usually has stand-alone and grid-connected modes,but most of the existing solar photovoltaic inverter has only a single function of off-grid or grid-connected,the suitability of system is relatively poor, difficult to meet the needs of the particular application. A medium and low-power stand-alone/grid-connected dual-mode inverter for solar photovoltaic system was designed,the composition, working principle and implementation of the inverter were introduced and developed.The designed inverter with a variety of functions,which can meet stand-alone or grid-connected and other solar photovoltaic applications, and can be used in different solar occasions.
There are serious nonlinear, variable strongly coupling characteristic in traditional fan filter units (FFU) motor, and its electromagnetic relationship is hard to analyze. In order to solve these problems, and because the FFU motor has serious nonlinear, variable strongly coupling characteristic, a control system for FFU motor speed regulation is carried out based on the variable universe fuzzy theory, which can modify universe according to the change of inputs. The simulation analysin and experimental results are prposed and verified the power supply can more effectively achieve the FFU fan motor variable frequency speed regulation control than traditional methods and the performance of the proposed control strategy.
A novel fan filter unit (FFU) motors group control system based on ZigBee wireless sensor networks is designed and implemented. The overall structure and composition of the proposed system were described. The design was achieved by software and hardware, used the digita1 signal controller (DSC) dsPIC30F3010 as the control core. The group system communicate by the use of ZigBee wireless sensor network based CC2531,which effectively overcome the traditional FFU fan group control network wiring complexity and high cost disadvantages, and improve the flexibility and control accuracy, meanwhile reducing system cost.The testing results show that the proposed system is feasible, accurate monitoring and control effectively, has the high valuable in engineering and marketing.
With the increase of electrical equipment, people's lives become increasingly dependent on electricity. In case of power interruption, people need to use emergency power supply.A portable solar photovoltaic mobile emergency power supply is designed in this paper,which uses embedded solar panels to provide power energy, and fitted with other complementary power input.The designed portable solar photovoltaic mobile emergency power supply provides optional DC12V/5V and AC220V output to meet the application requirements on different occasions.Through experimental tests on designed power supply prototype, the results indicated the power supply has good performance in all aspects.The designed and developed portable solar photovoltaic mobile emergency power supply has characteristics of energy saving, full-featured, high practicability and wide application [1-5].
Aiming at the water quality monitoring needs,a novel solar-powered digital water quality detecting instrument was designed in this paper. The water water quality detecting instrument using digital control and solar power technologies, which has the advantages of energy saving and environmental protection.The system components,hardware and sof tware of detecting instrument is introduced,and a prototype of designed water quality detecting instrument was developed and experimental test. Compared to the existing water quality detecting instruments,the designed has the advantage of energy saving and environmental protection, portable and efficient, accurate and reliable,which can be used for industrial and civil water quality monitoring.
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