One hundred years of power generation
facilities have proven to be stable and reliable source of energy , but these
facilities are large and complex , and rising construction costs . Meanwhile,
with minimal carbon emissions and environmental impact criteria to run these
facilities are also facing great challenges and cost pressures. In contrast ,
modern photovoltaic (PV) power plant power system as a reasonable alternative ,
it can provide a lower cost of long-term operation , modular, scalable ,
efficient , and carbon emissions lower than a centralized power generation
facilities lot .
Photovoltaic power generation system
consists of several components, such as the conversion of light energy into
electrical energy photovoltaic panels , mechanical, electrical connectors,
accessories, as well as the solar-generated electricity to the grid essential
to the process of solar inverters .
What is a solar PV inverter ? Photovoltaic
panels to convert sunlight into direct current , and in order to minimize line
losses , and the more long-distance power transmission , must be converted into
a DC high voltage alternating current. Solar PV inverter can achieve the above
DC to AC conversion, photovoltaic systems of all the most critical part.
However , this is only the PV inverter is one of the key features .
PV inverter disconnects from the grid also
has the ability to prevent PV system is not connected to the public service
system to provide power ; That is, if the grid is disconnected during the
online status of the inverter to maintain , or to unreliable connections
providing power, photovoltaic power generation system can cause feeding local
public service system transformers and wires in the public service system to
generate thousands of volts , will endanger the public service equipment
operation safety of workers .
IEEE1547 and UL1741 safety standards
regulations: When AC voltage or frequency exceeds the specification limit, the
grid-connected inverter must be disconnected , or when the grid no longer
exists, must be completely closed. When you reconnect , the inverter can not
immediately transmit power , you need to wait until the inverter detects a
nominal system voltage and frequency of the public service more than five
minutes . Of course , not only that the inverter duty .
The inverter output power is also used to
compensate for effects of environmental factors. For example , the PV panel
output voltage and current for the battery temperature and the light intensity
per unit area ( also known as " light " ) is highly sensitive to
changes . The output voltage of the battery and the battery temperature is
inversely related to the cell current is proportional to the light intensity .
These and other changes in key parameters result in optimal inverter voltage /
current operating point moves significantly .
Drive by using the so-called closed-loop
control to maintain a maximum power point (MPP) to solve the above problem,
because at this point the product of the voltage and the current maximum . In
addition , the dc to ac inverter also supports manual and automatic service operations
in the input / output disconnect , electromagnetic interference / radio
frequency interference (EMI / RFI) conduction and radiation suppression ,
ground fault interrupt , PC compatible communication interface and more .
Inverter is housed in a rugged box that can run in the outdoor full power for
25 years or more. It was no small feat !
没有评论:
发表评论