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 3KW Solar Power Syetem

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 3KW Solar Power Syetem

Power Electronics for Renewable Resource
SOLAR ENERGY 

·SOLAR PHOTOVOLTAIC CONVERTERS

Solar photovoltaic (PV) converters: Solar PV converters convert sunlight energy into electricity. A typical PV panel consists of two or more thin layers of 
semi-conducting material, which is commonly silicon. PV cells are connected together and encapsulated, to form a module or panel. Incoming solar rays are captured 
by the solar panels.

When light strikes the silicon, it produces electrons that are conducted away by a metallic grid as direct current (DC). This is then sent through an inverter 
and converted into alternating current (AC) electricity for use in the home, or at school.

IV. HOW A PV SYSTEM WORKS
Simply put, PV systems are like any other electrical power generating systems, just the equipment used is different than that used for conventional 
electromechanical generating systems. However, the principles of operation and interfacing with other electrical systems remain the same, and are guided by a 
well-established body of electrical codes and standards.
Although a PV array produces power when exposed to sunlight, a number of other components are required to properly conduct, control, convert, 
distribute, and store the energy produced by the array.
Depending on the functional and operational requirements of the system, the specific components required may include major components such as a 
DC-AC power inverter, battery bank, system and battery controller, auxiliary energy sources and sometimes the specified electrical load (appliances). In addition, an 
assortment of balance of system (BOS) hardware, including wiring, overcurrent, surge protection and disconnect devices, and other power processing equipment. 
Figure 3 show a basic diagram of a photovoltaic system and the relationship of individual components.

V. TYPES OF SYSTEMS
Photovoltaic power systems are generally classified according to their functional and operational requirements, their component configurations, and how 
the equipment is connected to other power sources and electrical loads. The two principal classifications are grid-connected or utility-interactive systems and 
stand-alone systems. Photovoltaic systems can be designed to provide DC and/or AC power service, can operate interconnected with or independent of the utility 
grid, and can be connected with other energy sources and energy storage systems.
Grid-Connected or Utility-Interactive PV Systems
Grid-connected or utility-interactive PV systems are designed to operate in parallel with and interconnected with the electric utility grid. The primary 
component in grid-connected PV systems is the inverter, or power conditioning unit (PCU). The PCU converts the DC power produced by the PV array into AC 
power consistent with the voltage and power quality requirements of the utility grid, and automatically stops supplying power to the grid when the utility grid is not 
energized. A bi-directional interface is made between the PV system AC output circuits and the electric utility network, typically at an on-site distribution panel or 
service entrance. This allows the AC power produced by the PV system to either supply on-site electrical loads, or to back-feed the grid when the PV system output 
is greater than the on-site load demand. At night and during other periods when the electrical loads are greater than the PV system output, the balance of power 
required by the loads is received from the electric utility This safety feature is required in all grid-connected PV systems, and ensures that the PV system will not 
continue to operate and feed back into the utility grid when the grid is down for service or repair.

Stand-Alone Photovoltaic Systems