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The difference between stand-alone and grid-connected PV systems

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Solar photovoltaic (PV) power generation systems can be categorized into two main types according to their relationship with the power system: stand-alone PV systems and grid-connected PV systems.

 

Grid Connected PV Power Generation System Cable


Stand-alone PV System

 

Stand-alone PV system consists of solar PV arrays, battery packs, charge controllers, power electronic converters (inverters), loads and so on.

 

The principle of operation is that the solar radiation energy is first converted into electrical energy by the PV array, and then converted by the power electronic converter to supply power to the load. At the same time, the excess electrical energy is stored in the form of chemical energy in the energy storage device after the charge controller. In this way, when the sunshine is not enough, the energy stored in the battery can be transformed into 220V, 50 Hz AC power for AC loads after the power electronic inverter, filtering and industrial frequency transformer boost.

 

Solar power generation is characterized by daytime power generation, while the load is often all-weather electricity, so in the independent photovoltaic power generation system in the energy storage components are essential, the engineering use of energy storage components are mainly batteries.

 

MPPT Solar Charge Controller Cable

 

Grid-connected photovoltaic power generation system

 

Grid-connected photovoltaic power generation system consists of photovoltaic arrays, high-frequency DC/DC booster circuits, power electronic converters (inverters) and system monitoring components.

 

Its working principle is that the solar radiation energy through the photovoltaic array conversion, and then by the high-frequency DC conversion into high-voltage DC, and then through the power electronic inverter inverter to the power grid output and grid voltage frequency consistent sinusoidal AC current.


The biggest difference between the above two kinds of PV power generation system is that the grid-connected PV power generation system is directly connected to the power grid, thus the power surplus of the PV array and the parallel power grid can be implemented to complement each other, eliminating the need for independent PV power generation system in the battery and other storage components, not only reduces the cost of the system, but also ensures the reliability of the system. At the same time, the intensity of solar radiation in summer, the PV system power generation, can play a role in regulating the peak load of the power grid in summer. With the large-scale application of solar photovoltaic power generation in recent years and the rapid decline in the price of solar cell components, grid-connected systems will undoubtedly be more widely used.


Premier Cable is specialized in providing wiring harness manufacturers for photovoltaic power generation system, if you need any wiring harness solution about solar energy, you can find it here with us, welcome to leave a message: sales05@premier-cable.net

 

Solar Panel Electrical Installer MC4 Power Cable

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