A new type of fault ride-through protection circuit for doubly-fed wind turbines

Abstract

The invention belongs to the field of wind power protection, and specifically relates to a novel doubly-fed wind power generator set fault ride-through protection circuit. The novel doubly-fed wind power generator set fault crossing protection circuit comprises current limiting circuits, bypass circuits, and short-circuited circuits, wherein one current limiting circuit and one bypass circuit are connected in parallel, there are three such parallel circuits, and for each parallel circuit, one end (namely, the three-phase input ends U1, V1 and W1) is connected with the three-phase winding of a doubly-fed induction motor rotor of a doubly-fed wind power generator set, any two phases of the other end (namely, the three-phase output ends U2, V2 and W2) are connected through the two short-circuited circuits, and the three-phase output ends are connected with the three-phase alternating-current output end of a rotor-side converter in the current transformer structure of the doubly-fed wind power generator set. The problem that a doubly-fed induction motor may be out of control during traditional crowbar protection under most voltage faults is solved, the reactive power consumption is reduced, and the transient characteristic and fault ride-through capability of the doubly-fed wind power generator set are enhanced.

Description

technical field [0001] The invention relates to the field of wind power protection, in particular to a novel double-fed wind turbine fault ride-through protection circuit. Background technique [0002] In order to cope with the energy crisis and environmental degradation, countries around the world are actively promoting the development and utilization of renewable energy. Among them, wind power generation has become the focus of scientific research personnel and commercial enterprises. This is because wind energy is a reliable, unlimited, renewable source of electricity supply. The large-scale application of wind power can not only alleviate the energy crisis, but also reduce the environmental problems caused by the use of conventional energy, thereby reducing the emission of carbon dioxide gas. [0003] However, the integration of large-scale wind power into the grid has brought great challenges to the safe operation of the grid. Therefore, the new grid guidelines requi...

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