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Photovoltaic enclosures

The photovoltaic market is a highly demanding one in terms of safety and quality. Within the space of a decade, it has gone from an experimental to an industrial stage, which requires professionalisation based on the standardization of components, their use and the rules for installation.

It is therefore imperative to call on the skills of a specialist to guarantee installations are as safe, durable and efficient as possible. Its expertise in photovoltaic technology enables SOCOMEC to demonstrate the application of its experience in the search for solutions to optimise electrical installations and combine this with environmental protection.

Types of installations

Photovoltaic applications are available in two types of installations:
Installations connected to the network
  • These are designed to be synchronised with the national grid. The energy they produce can be used to supply a site and all or some of this energy can be reinjected into the national grid when the on-site energy demands are low. When local demand is greater than the energy produced by the PV installation, the local supply is then topped up by the national grid.
Isolated standalone installations
  • These are designed to operate independently of the national grid. They can be combined with another energy source (wind, generators, etc.), to form a “hybrid photovoltaic” installation.

 

Main architectures

Centralised inverter installations
Centralised inverter installations
Multi-inverter installations
  • This architecture is designed for high-power industrial installations from a few hundred kWc to several MWc. If there is a fault or maintenance is required, the loss of production is limited to the machine in question.
Individually managed multi-inverter installation
  • This architecture is used to reduce the power of the PV inverters, splitting the PV generators and inverters over several lines.
Multi-inverter installations
Centrally managed multi-inverter installation
  • Connecting PV generators in parallel to all the inverters allows a high level of flexibility in terms of maintenance and managing the operating time of the machines. Managing in this way also ensures the inverters are used at their optimum power, depending on the level of sunlight.
Centrally managed multi-inverter installation

 

Main functions

Photovoltaic generator AC side, downstream of the inverter 
Photovoltaic generator AC side
  • PV panels.
  • Switching and breaking.
  • Short circuit and voltage
  • surge (lightning) protection.
  • Differential protection and control.
DC side, upstream of the inverter Network synchronisation
DC side Network synchronisation
  • Switching and breaking.
  • Short circuit and voltage surge (lightning) protection.
  • Integration in double insulation (Class 2 components).
  • Metering.
  • Switching and breaking.
  • HV/LV transformation depending on the installed power.
Inverter DC/AC converter
Inverter DC-AC converter
  • Conversion of the DC current produced by the photovoltaic panels into AC current.
  • Automatic disconnection (loss of insulation, mains power, etc.).