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| 1).Characteristic (1)System characteristic Photovoitaic system produces power by solar module which converts the solar energy directly ioto the electricity energy.Solar module utilizes the electronics characteristic of semiconductor materials to achieve solid installation of P-V switch.In the power grid area ,it is convenient to use this kind of equipment for illumination and living power supply,and it can complement regional power grid in some developea countries.In China,we mainly focus on micro-PV power system for the family illumination in no electric area. (2)Techology characteristic: ·System integrated high quality with complete controller, inverter,monitor,protection,and communication facility. ·High transform efficiency,up to 92％ of controller,inverter and output efficiency. ·High autoimmunization,turn on/off,survey,protection automatically,operates the equipmentsin possession of preliminary electrician knowledge,very suitable for remote area. ·High manufa ture precision,using voltage-mode voltage control,pure sine wave output voltage accuracy≤±1.5%,frequency accurary≤±1.0%,harmonic≤5%； ·High digital degree,pure digital control,output,with RS232,Rs485 cimmunication interface to achieve remote monitoring,operation; ·High implementation reliability,whoke machine unitzation design,realize modular of inverter unit,master control,convenient to maintenance and replacement,ensure the system operates well in the inverter maintenance Safe reliability 2).Element of system ·Power System:solar energy module and storage battery. ·Controller protection system:controller and inverter ·System terminal(load):user’s consumer 3).System design condtion ·Geography condition; ·Load condition; ·Temperature,humidity and other weather condition ·Latitude and longitude ·Wind condltion ·Sunshine duration 4).the principle of PV power system PV power system can basically be divided into two categories,namely;ndependent operation and grid connected power operation.PVindependent power system is made up of solar energy mmodule,controller,inverter,storage battery and the bracket.The specific work principle:During the day,sunlight strikes the PV module and then it generates DC.DC transferred through the controller are partly transformed into AC through the inverter, the other part of the DC is charge up for the battery.Whenthen the sunlight is low,the storage battery will supply energy to inverter through DC control system,and transform DC to AC through inverter to supply power to the AC load.Photovoltaic grid connected system utilizes power grid paraller operatian’s technology proposal without storage battery. |