An installation for powering auxiliary systems in electricity generation plants, wherein said auxiliary systems can be any load operating with direct current at a constant voltage, including a battery, a controller for controlling the position of one or more solar panels or collectors, an illumination system, an electric generating set, a weather station, safety or surveillance systems, or communication systems, installed inside or adjacent to the electricity generation plant, the installation comprising: - a DC-generating arrangement formed by a plurality of electrical generators (PV1...PVn) connected in series and located inside a local area, and envisaged for supplying a remote area with a global direct current with a voltage that is the sum of the voltage provided by each of said electrical generators (PV1...PVn) providing, as a whole, a supply of energy through end terminals of said DC-generating arrangement; and - a current-fed power converter which is electrically connected in series between any two connection points (p1, p2) of said plurality of electrical generators through respective input terminals (T1, T2) of said DC-generating arrangement, characterized in that said current-fed power converter is an auxiliary power supply device which is arranged inside said local area and that is configured to provide the auxiliary systems with a supply voltage in said local area; and wherein said auxiliary power supply device further comprises a system for protection against over voltages (Mps) configured to short-circuit the input terminals (T1, T2) of the auxiliary power supply device when it detects a voltage between said input terminals (T1, T2) with a value above a predetermined threshold, wherein said system for protection against overvoltage (Mps) comprises at least one switch connected between the two input terminals of the current-fed power converter. wherein said auxiliary systems can be any load operating with direct current at a constant voltage, including a battery, a controller for controlling the position of one or more solar panels or collectors, an illumination system, an electric generating set, a weather station, safety or surveillance systems, or communication systems, installed inside or adjacent to the electricity generation plant, the installation comprising: - a DC-generating arrangement formed by a plurality of electrical generators (PV1...PVn) connected in series and located inside a local area, and envisaged for supplying a remote area with a global direct current with a voltage that is the sum of the voltage provided by each of said electrical generators (PV1...PVn) providing, as a whole, a supply of energy through end terminals of said DC-generating arrangement; and - a current-fed power converter which is electrically connected in series between any two connection points (p1, p2) of said plurality of electrical generators through respective input terminals (T1, T2) of said DC-generating arrangement, - a DC-generating arrangement formed by a plurality of electrical generators (PV1...PVn) connected in series and located inside a local area, and envisaged for supplying a remote area with a global direct current with a voltage that is the sum of the voltage provided by each of said electrical generators (PV1...PVn) providing, as a whole, a supply of energy through end terminals of said DC-generating arrangement; and - a current-fed power converter which is electrically connected in series between any two connection points (p1, p2) of said plurality of electrical generators through respective input terminals (T1, T2) of said DC-generating arrangement, characterized in that said current-fed power converter is an auxiliary power supply device which is arranged inside said local area and that is configured to provide the auxiliary systems with a supply voltage in said local area; and wherein said auxiliary power supply device further comprises a system for protection against over voltages (Mps) configured to short-circuit the input terminals (T1, T2) of the auxiliary power supply device when it detects a voltage between said input terminals (T1, T2) with a value above a predetermined threshold, wherein said system for protection against overvoltage (Mps) comprises at least one switch connected between the two input terminals of the current-fed power converter.