METHOD FOR OPERATING A PHOTOVOLTAIC SYSTEM COMPRISING AN ENERGY STORE AND A BIDIRECTIONAL CONVERTER FOR CONNECTION OF AN ENERGY STORE

摘要

In order to operate a photovoltaic system including an inverter and a photovoltaic generator connected to an inverter input, the inverter predefining an operating voltage of the photovoltaic generator at the input and being configured to track an operating voltage of maximum power from the photovoltaic generator. The system also includes an energy store for electrical energy and a bidirectional converter, via which the energy store is connected, in parallel with the photovoltaic generator, to the input of the inverter. A temporal profile of the power output by the photovoltaic generator is recorded by the converter. The converter is operated in a compensation mode that compensates for fluctuations in power from the photovoltaic generator in comparison with a target power flowing into the inverter via the input by adapting the power (PDC) output by it at the input or branched off from there in such a manner that the sum of the power (PDC) from the converter and the power (PPV) from the photovoltaic generator is equal to the target power (PSoll). The converter is operated in a tracking mode that it makes it possible to track the operating voltage of maximum power by means of the inverter. There is a repeated change between the compensation mode and the tracking mode during ongoing operation of the photovoltaic system in which power from the photovoltaic generator is available.

主权项

1. A method for operating a photovoltaic system comprising an inverter, comprising a photovoltaic generator connected to an input of the inverter, the inverter predefining an operating voltage (UPV) of the photovoltaic generator at the input and being configured to track an operating voltage (UMPP) of maximum power from the photovoltaic generator, comprising an energy store for electrical energy and comprising a bidirectional converter, via which the energy store is connected, in parallel with the photovoltaic generator, to the input of the inverter,
recording a temporal profile of the power (PPV) output by the photovoltaic generator using the bidirectional converter, operating the bidirectional converter in a tracking mode to enable tracking the operating voltage (UMPP) of maximum power using the inverter, operating the bidirectional converter in a compensation mode such that the bidirectional converter compensates for fluctuations in the power (PPV) from the photovoltaic generator in comparison with a target power (PSoll) flowing into the inverter via the input by adapting the power (PDC) output by the bidirectional converter at the input or branched off from there such that a sum of the power (PDC) from the bidirectional converter and the power (PPV) from the photovoltaic generator is equal to the target power (PSoll), and repeatedly changing between the compensation mode and the tracking mode during ongoing operation of the photovoltaic system in which power (PPV) from the photovoltaic generator is available.