Wind power generation system for direct-drive dual stator-winding induction generator

Abstract

The invention discloses a wind power generation system for direct-drive dual stator-winding induction generator, which is characterized in that the wind power generation system for direct-drive dual stator-winding induction generator comprises a main loop, a detection loop and a control loop; the main loop consists of a direct-drive dual stator-winding induction generator, a rectifier bridge, a power winding side DC capacitor, a filter inductor, a control convertor, an excitation capacitor bank, and a control-side DC capacitor; the detection loop consists of a current sensor, and voltage sensors the number of which is m; the control loop consists of a digital signal processor and a drive circuit for control convertor. The wind power generation system for direct-drive dual stator-winding induction generator outputs higher voltage (which can reach the KV level) under a low speed and the control winding of the wind power generation system for direct-drive dual stator-winding induction generator is designed to operate under a lower voltage class. By jointly controlling the excitation capacitor bank and control convertor, the wind power generation system has better steady-state and dynamic performance and has the advantages of direct drive operation, inexistence of brush slip ring, wide wind velocity power generation, low cost, etc.

Description

technical field [0001] The invention relates to a novel direct-drive stator double-winding asynchronous motor power generation system capable of generating power at low wind speeds. Background technique [0002] The worldwide energy shortage and environmental deterioration have greatly promoted the development of wind power and other renewable energy power generation systems, and the independent power supply system has also put forward higher requirements for the capacity and quality of the power supply. The common point of these power supply systems is that the generator is required to adapt to the wide speed change of the prime mover, and the three-phase asynchronous motor (especially the squirrel-cage rotor) is becoming more and more popular because of its simple and firm structure, high reliability, and easy maintenance. An important choice for wind power and stand-alone power systems. [0003] The application of traditional asynchronous generators is limited due to the...

AI Technical Summary

Problems solved by technology

However, this type of generator also has some shortcomings: for example, the converter capacity of the series excitation three-phase asynchronous motor power generation system is large, and the switching harmonics of the converter are easily injected into the load; the parallel excitation power generation system requires a large volume of isolation inductors , and system performance is greatly affected by the size and nature of the load

[0006] The stator double-winding generator system is mainly aimed at realizing variable-speed and variable-load operation in the constant power region of the independent power supply system. Wind Energy Capability of Winding Generator in Low Wind Speed ​​Area

At the same time, because the output voltage level is not high, if it is applied to offshore wind power generation, it cannot adapt to the high-voltage direct current transmission method, which increases the difficulty and cost of the subsequent high-voltage direct current transmission

Images