System and method for improving low-voltage ride-through of wind power generation system by using magnetron reactor

Abstract

The invention discloses a system and a method for increasing low voltage ride-through of a wind power generation system through a magnetically-controlled reactor. The magnetically-controlled reactor is serially connected to a connecting line of the wind power generation system and a main grid of a power system; the magnetically-controlled reactor is under control of a control circuit I; the control circuit I acquires a voltage value of a grid-connected bus through a voltage transformer; when the voltage value U3 of the grid-connected bus is normal rated voltage Un, reactance value of the magnetically-controlled reactor is controlled to a minimum value Zmin; when the voltage value U3 of the grid-connected bus ranges from Un to 0.5Un, the reactance value Zmin of the magnetically-controlled reactor is maintained; when the voltage value U3 of the grid-connected bus ranges from 0.5Un to 0, the reactance value of the magnetically-controlled reactor is controlled to range from Zmin to Zmax. Adding a new control target and a new circuit to a control system of a double-fed wind generator is not required; the low voltage ride-through problem of the wind power generation system is solved; the method allows the low voltage ride-through capacity of the wind power generation system to be optimized. The method is simple and reliable.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a system and method for improving low-voltage ride-through of a wind power generation system by using a magnetron reactor. Background technique [0002] Wind power is clean energy, and in recent years, wind power systems have developed rapidly. Low-voltage ride-through means that when the voltage at the grid-connected point of the wind turbine drops, the wind turbine can maintain low-voltage ride-through and connect to the grid, and even provide a certain amount of reactive power to the grid to support the recovery of the grid until the grid returns to normal, thereby "riding" this low-voltage ride-through. Voltage time (area). Low voltage ride through is a specific operational functional requirement for grid-connected wind turbines to remain connected to the grid when the grid voltage drops. The wind power generation system is required to have strong low voltage ride throu...

AI Technical Summary

Problems solved by technology

Since the control system of the wind turbine itself needs to achieve multiple control objectives, it is difficult to achieve coordination among many objectives in one control system, and it is difficult to optimize the control characteristics.

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