Multi three-phase AC excitation pumped storage asynchronous generator/motor

Abstract

This invention refers to a rotor more three-phase ac excitation water pumping energy storage asynchronous generator / motor 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 0<=beta<180 degree / (nX3), or other angle.

Description

Technical field: [0001] The invention relates to a multi-three-phase AC excitation pumped storage asynchronous generator / motor that uses an inverter to supply power to rotor windings. Background technique: [0002] In recent years, countries around the world are actively building pumped storage power stations due to the need for power peak regulation, and pumped storage units are developing in the direction of high speed and large capacity. Generally, the storage capacity of the pumped storage power station is small, and the power generation head and pumping head vary widely, and the power generation head and pumping head are also different. In order to meet the requirements of pumped storage units operating within a relatively large water head (head) range, foreign countries began to develop speed-adjustable pumped storage units in the late 1960s. Compared with conventional fixed-speed units, the use of speed-regulating units in pumped storage power stations has the follow...

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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