Rotor multi three-phase AC excitation asynchronous hydraulic generator

Abstract

This invention refers to a rotor more three-phase ac excitation hydraulic generator adopting inverter to supply power, which contains three-phase stator windings directly connected with power frequency network, plurality of groups of three-phase symmetry windings independent in circuit, there is only magnetic circuit coupling among groups without direction relation in electric circuit, the each star connected three-phase windings has independent zero point, the angle connected windings is independent, the total windings phases are multiple times of three, e.g. 2X3, 3X3...NX3 (n is the positive integer greater than 2), the displacement angle can adopt 360 degree / (nX3), 180 degree / (nX3), or 0<=beta<180 degree / (nX3).

Description

Technical field: [0001] The invention relates to a multi-rotor three-phase AC excitation hydraulic generator which adopts an inverter to supply power to rotor windings. Background technique: [0002] For the hydroelectric power generation system, the water head and flow of the reservoir during the flood season and the non-flood season are very different. During the flood period, due to the high head and relatively large flow, the fixed-speed hydroelectric generator cannot use this energy, and often produces a large amount of abandoned water; In the non-flood season, due to the relatively low water head, the turbines and generators often work in a lower efficiency range due to the limitation of constant speed operation. The conventional hydro-generator set can only run at the rated synchronous speed, and the speed of the unit is fixed. Therefore, the operating condition of the hydro-generator is solely determined by the water head and load, and there is no room for adjustmen...

AI Technical Summary

Problems solved by technology

After the conventional three-phase system is adopted, the power of the AC excitation inverter is as high as tens of megawatts or even hundreds of megawatts, which makes the structure of the inverter complicated, the cost increased, and the manufacture difficult. At the same time, a single three-phase system is adopted. When a phase winding of the motor or a phase bridge arm of the inverter fails, the system will stop working

For a single inverter system with a large power, the AC-AC inverter system is generally used. In some working areas, the power factor of the system is low, and the problem of harmonic pollution to the power grid needs to be solved by additional devices.

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