الوصف

Rationale of the system        

 

DJM*9Pgrid-connectedPV generatingsystem iscomposed ofthe PV cell array, controllers andgrid-connected inverters whichdirectlyconveying power topublic grid through to thegrid-connected inverter,withoutthebattery.Grid-connectedPV generating system eliminate thestorage and release processcompared to off-grid systems.Sothe systemreducesdevicescosts, energy consumption andsavingplace.It is worth affirming that:a large portion of grid-connectedPVgenerating systemare for the case of thegrid and developedgovernment'senergy-saving.Grid-connectedgenerationis the development of solar photovoltaic generation, is themost potential energytechnologiesin*1st century.

 

System Operation             

Grid-connected solarPV generatingsystem is composed ofPV modules and PV grid-connected inverter. PV modules convert the solar energy into DC, and thenconvert DC into ACwith the same phaseand frequencyof electricity into the gridthroughto the grid-connected inverter. Grid-connected inverter is the core equipment ofgrid-connected PV system.     

 

MainModule Introduction

 

(1)Solar Module

 

The role ofSolarModule is convertradiation energy from sunlight to DC power, whichisnot onlythe main part of the solar powersystem,but the mostvaluable part of the system.

 

(2)Grid-connectedInverter

 

Grid-connected inverter is a device that converts DC to AC. Thesolar arrayconnect end andAC grid connect the output end. In addition to the functions ofgeneral inverter,grid-connected inverters have the following features:

 

1. Synchronous transmission by pure sine wave :the systeminstantaneously convertcurrent into*0Hz sine wavethroughtothe DC/AC voltage-type inverter,and thenconvey to the grid afterautomatically synchronized with the grid.The way convey with sine wave currentwould not producetheharmonic interference and the reactive component.

 

2. The technology of photovoltaic maxpower-point tracking: the crystalline silicon as the basic material for solar cellshavevary I-Vcharacteristic curveunder different illumination intensities and temperatures, while the output corresponding to theI-V characteristics of a maxpower outputpoint. Therefore,the track for thesolar max power pointisone of the key points in improving the efficiency of the  system.                                                                      

3.Anti-Islandingoperationtechniques: If the system black outdue totheunexpected circumstances when itgrid-connectedruns, thenetwork grid-connectedequipment should detectthe trouble in time, and stopconveying power to the devices in order toprotectpeoplesafety and equipment.    

                                                

4.Grid connected operation technologiesof independent power supply and automatic sync:The system canautomatic separate with the grid and provide enough AC with thecritical load when the grid is off.After equipped with batteries, the system can also provide uninterrupted power during the night.When the grid is running, the system switches togrid-connected power generationmodel withoutinfluencing the operating load through tosynchronize with the grid.