Wind farm super capacitor energy storage type unified power quality conditioner

Abstract

The utility model provides a wind farm super capacitor energy storage type unified power quality conditioner which comprises a compensation transformer, a series connection compensator, a parallel connection compensator, a current limiting circuit, a super capacitor group, a bidirectional DC / DC chopper circuit, a signal acquisition conditioning circuit, a control circuit and a driving circuit. The conditioner has two control modes which are a power regulating mode and a low voltage ride through mode. In the power regulating mode, the wind power unit assembly output power quality can be improved, in the low voltage ride through mode, namely in a fault condition, the blower outlet voltage can be maintained and is not reduced, and the current influence on a blower system is avoided until the voltage is recovered and the low voltage ride through is realized. Electric energy generated by the blower in a fault stage can be stored in the super capacitor group, the energy is transmitted to the power grid after a power grid is recovered to a normal state, and the waste of the electric energy is avoided. The conditioner has versatility and can be applied to wind farms of various blower generations of a fixed speed induction generator (FSIG), a permanent magnet synchronous generator (PMSG) and a double-fed induction generator (DFIG).

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a wind farm supercapacitor energy storage type unified power quality regulator. Background technique [0002] With the increase of wind turbine unit capacity, wind energy is becoming one of the energy sources widely used in power systems. In order to reliably supply power to the grid, wind turbines must strictly meet the grid access requirements, especially the voltage, current and harmonics must meet the grid access requirements. When the grid failure causes a voltage drop, the wind turbines are required to have a certain low-voltage ride-through function. Generally, if the grid fails, the wind turbines will implement passive self-protection and immediately disconnect. When the grid voltage drops, a large number of wind turbines will Cutting off will lead to a shortage of active power in the local power grid, which poses a serious threat to the stabil...

AI Technical Summary

Problems solved by technology

The unified power quality conditioner has changed the traditional voltage or current waveform compensation method in power quality management, and it can adapt to the compensation requirements of system current and voltage as a whole, and has a long-term development prospect. Connected to ordinary capacitors, as the number of charge and discharge increases, the life of the capacitor will be shortened quickly

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