Fault ride-through control method and system for double-wind-wheel wind generating set

Abstract

The invention discloses a fault ride-through control method and system for a double-wind-wheel wind generating set, and belongs to the technical field of wind power generation. The method comprises the steps of judging whether a parallel power grid has a voltage fault or not by detecting the voltage of a grid-connected point of a three-port fan converter, and if the parallel power grid has the voltage fault, calculating the voltage value of a direct-current bus of the three-port fan converter and the rotating speed of a wind wheel with a relatively lower rotating speed in a current double-wind-wheel generator set; and according to the real-time rotating speed and the power value of the low-speed wind wheel, switching the working state of the machine-side converter corresponding to the low-rotating-speed wind wheel rapidly, so that the electric and power generation state of the motor is changed, and the low-rotating-speed wind wheel absorbs instantaneous electric energy from a direct-current bus or releases electric energy to a power grid system through a three-port fan converter. According to the technical scheme, the double wind wheels of the wind turbine generator are rapidly controlled to be mutually loaded, the problems of low efficiency, high cost, poor safety and the like caused by the fact that fan fault ride-through is achieved through the consumption electric energy consumption of the resistors in the prior art, are solved, and the method has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a fault ride-through control method and system for a wind power generating set with two wind rotors. Background technique [0002] Due to major environmental problems such as regional smog and global warming caused by the massive consumption of traditional fossil energy, it has become a global consensus to vigorously develop clean renewable energy (such as wind energy, light energy and other renewable energy). As renewable new energy, wind energy and solar energy are attracting increasing attention due to their advantages of wide sources, large reserves, and no pollution. As a special carrier of energy, electric energy has the characteristics of cleanness, high efficiency and environmental friendliness, so it is of great significance to vigorously develop new energy power generation. [0003] With the rapid development of the wind power industry, areas ...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a method and system for fault ride-through control of dual-wind turbine wind turbines, which solves the problems of low efficiency, high cost, and poor safety in the prior art that rely on resistance to consume electric energy to achieve fault ride-through of wind turbines.

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