An 18-phase wind power generation system and its control method

Abstract

The invention discloses an 18-phase wind power generation system and a control method thereof. The wind power generation system includes an 18-phase permanent magnet synchronous generator, 18 single-phase bridge-type full-control rectifiers and 18 power electronic transformers; Each phase winding of the synchronous generator is rectified by a single-phase bridge fully-controlled rectifier and then passed through a power electronic transformer. The secondary output terminals of all power electronic transformers are cascaded and connected to the high-voltage DC grid. The invention replaces the traditional three-phase motor with an 18-phase permanent magnet synchronous generator. Compared with the traditional three-phase generator, the power transmitted by the 18-phase permanent magnet synchronous generator is larger; at the same time, more phase windings ensure that the 18-phase The permanent magnet synchronous generator can still effectively transmit power when the winding part is broken, and has high fault tolerance; and, under the action of the stator harmonic current, the electromagnetic torque of the 18-phase permanent magnet synchronous generator The lower pulsation greatly improves the reliability of the 18-phase permanent magnet synchronous generator during operation.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an 18-phase wind power generation system and a control method thereof. Background technique [0002] With the aggravation of the global energy shortage and the increasingly serious issue of energy supply security, countries around the world are actively trying to explore and develop new energy sources. In recent years, my country's wind power has developed rapidly, and the total installed capacity of wind turbines has increased year by year. At present, the total installed capacity of wind power in my country has ranked first in the world. According to the "2019 National Electric Power Industry Statistics" released by the National Energy Administration, as of December 2019, the cumulative installed capacity of wind power in my country has reached 210,050MW, and the cumulative installed capacity of wind power in my country has increased significantly in the past ten ...

AI Technical Summary

Problems solved by technology

[0003] Traditional three-phase motors have low output power, small output torque, and low voltage level, which are difficult to meet the requirements of high-voltage and high-power grid connection. This will not only cause the system to be too large, the reliability is too low, the cost is high, and the control is more complicated

Images