Low-voltage ride-through distributed power supply system and wind generating set

Abstract

The invention discloses a low-voltage ride-through distributed power supply system based on a wind generating set. One end of a transformer is connected with a power grid, and the other end of the transformer is connected with a grid side module of a converter; the stator end of a generator is connected with a grid-connected switch, the rotor end of the generator is connected with a machine side module of the converter, and the machine side module of the converter is connected with the grid side module of the converter; and a variable pitch control system is connected with a paddle to regulate the pitch angle of the paddle so as to realize rotating speed control. A fan controller is connected with the variable pitch control system and the converter and used for controlling the operation of the whole wind generating set and transmitting control signals to the variable pitch control system and the converter; uninterruptible power supplies are respectively arranged in the converter, the variable pitch control system and the fan controller; and when the voltage of the power grid drops, the uninterruptible power supplies keep stable voltages and supply power to the converter, the variable pitch control system and the fan controller.

Description

technical field [0001] The invention relates to the field of distributed power supply, in particular to a distributed power supply method based on wind power generating sets. Background technique [0002] Wind energy has become a world-recognized clean energy, and wind power technology is developing at an unprecedented speed. With the increasing installed capacity of wind power, the influence of wind farm operation on system stability cannot be ignored. Power systems around the world have increasingly strict requirements for wind farms to be connected to the grid, and put forward stricter technical requirements, including low voltage ride-through capability, reactive power control capability and output power control capability, among which low voltage ride through is considered to be the The biggest challenge for wind turbine design control technology. [0003] Low voltage ride through capability refers to the ability of wind turbines to continue to operate without disconn...

AI Technical Summary

Problems solved by technology

[0004] The existing low-voltage ride-through power supply mode is relatively simple. Generally, an uninterruptible power supply is used to supply power to other control systems such as fan controllers, converter controllers, and pitch controllers. If the uninterruptible power supply fails, it cannot work normally. , when the grid voltage drops, the entire system will be out of control, causing irreparable losses

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