Solar inverter for an extended insolation value range and operating method

Abstract

The invention relates to an inverter system (1) for a photovoltaic solar power plant for generating alternating voltage from a direct current voltage of a solar generator (2) is provided, which has an additional energy store (38) which is arranged in an energy transmission path (36) which is connected to the solar generator and can be activated as needed. A control device (31, 34) for monitoring and controlling the operation of the inverter system (1) is set up to detect brief power peaks in the insolation in the solar generator and, when insolation peaks are present, to activate the energy transmission path (36) in order to effect a transmission of energy from the solar generator (2) to the energy store (38).; The surplus radiation can thereby be temporarily buffered during the brief insolation peaks and used later to cover the intrinsic consumption of the inverter (4) or to feed secondary consumers, which increases the efficiency or output of the solar power plant. A method for operating an inverter system for a photovoltaic solar power plant in order to use insolation peaks in a solar generator is also disclosed.

Description

technical field [0001] The invention relates to an inverter system for a photovoltaic solar system and to an operating method for said system and in particular to a solar inverter with an operating method for an extended insolation value range method of operation. Background technique [0002] Inverter systems for photovoltaic solar installations which have to be connected to a solar generator and are used to generate a single-phase or multi-phase alternating voltage from the direct voltage of the solar generator, in different configurations Known. In a conventional configuration, they have an intermediate circuit which must be connected to the solar generator and have one or more capacitors for energy storage, if necessary with a boost between the solar generator and the intermediate circuit to adjust the voltage of the solar generator to a higher level as required, and to have an inverter connected to the intermediate circuit, the output of which can be used for energy f...

AI Technical Summary

Problems solved by technology

First, as already mentioned above, inverters become significantly more expensive with increasing size

Second, the part load efficiency in normal operation, for example at 10% of the rated power of the generator, is significantly worse

Finally, there often does not exist such a receiving power network or receiving capable consumer units

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