Energy conversion system and method with negative sequence current compensation mechanism

Abstract

The invention discloses an energy conversion system and method. The energy conversion system includes a direct current bus, a converter module, and a converter control module. The DC bus is used to receive DC power from the power supply. The converter module is used to convert the direct current on the direct current bus into alternating current. The converter control module is used to: generate the first command signal according to the active power command signal and the active power feedback signal; generate the second command signal according to the reactive power command signal and the reactive power feedback signal; generate the second command signal according to the negative sequence current command signal and the The negative-sequence current feedback signal on the grid generates first and second negative-sequence current correction signals for compensating the negative-sequence current, and the first and second command signals are respectively adjusted based on the first and second negative-sequence current correction signals; and generating a control signal based on the adjusted first and second command signals to drive the converter module to work under the action of the control signal.

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 more particularly to a negative sequence current compensation mechanism and method of the energy conversion system. Background technique [0002] Basically, in 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, and each photovoltaic array includes a plurality of interconnected photovoltaic cell units, which can convert solar radiation 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...

AI Technical Summary

Problems solved by technology

In this way, when a fault occurs in the power grid, such as a single phase fault (single phase fault) or the overall unbalance of the three-phase system, the resulting negative sequence current may affect the stability of the system

Specifically, a large negative sequence current may limit the positive sequence current output by the AC output terminal, which may cause the output of the positive sequence current to fail to meet the needs, and this makes the energy conversion system unable to meet the design needs of the grid

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