Energy conversion system and method of operation thereof, photovoltaic power generation system

Abstract

The invention discloses an energy conversion system and an operation method thereof and a photovoltaic power generation system. The energy conversion system comprises a direct-current bus, a converter module and a converter control module. The direct-current bus receives direct current from a power supply. The converter module converts the direct current on the direct-current bus into alternating current. The converter control module generates phase angle command signals according to power command signals and power feedback signals. The converter control module generates phase jump correction signals on the basis of detected network voltage when a transient event happens, and adjusts the phase angle command signals on the basis of the phase jump correction signals. The converter control module generates control signals at least on the basis of the adjusted phase angle command signals to ensure that the converter module drives the alternating voltage output by the converter module to be kept synchronous with the network voltage when the transient event happens under the action of the control signals. The invention also discloses a converter control system, a method for controlling operation of the energy conversion system, and the photovoltaic power generation system.

Description

Technical field [0001] The disclosed embodiments of the present invention relate to an energy conversion system and method to provide electrical energy to the power system, and in particular to a phase compensation mechanism and method of the energy conversion system. Background technique [0002] Basically, throughout the world, the share of electricity generated by renewable energy power generation systems, such as photovoltaic power generation systems, is becoming more and more significant. A general photovoltaic power generation system includes one or more photovoltaic arrays, each of which includes a plurality of interconnected photovoltaic cell units, which can convert solar radiant energy into direct current electrical energy. In order to realize the grid-connected power generation of the photovoltaic array, a converter module is usually used to convert the DC power generated by the photovoltaic array into AC power that can be transmitted by the grid. [0003] The existing ...

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Problems solved by technology

And this reverse energy flow may damage the semiconductor devices in the energy conversion system, and make the DC bus of the energy conversion system bear a large voltage stress

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