Generation system mechanical stepless converter and control method thereof

Abstract

The invention discloses a generation system mechanical stepless converter and a control method of the generation system mechanical stepless converter, and belongs to the technical field of power generation. The generation system mechanical stepless converter and the control method of the generation system mechanical stepless converter are used for frequency control of output power of a generator unit. The generation system mechanical stepless converter is wide in frequency adjustment range, low in cost, high in overload capacity and low in fault rate. The generation system mechanical stepless converter comprises a CVT, wherein the output end of a prime mover system is connected with the input end of the CVT, the output end of the CVT is connected wit the input end of the generator unit, and the output end of the generator unit is connected with a power grid through a transformer; a rotation speed sensor is arranged on an output shaft of the CVT or an input shaft of the generator unit, the output end of the rotation speed sensor is connected with the input end of a controller, and the output end of the controller is connected with a speed ratio driver of the CVT. According to the control method, the controller controls the speed ration variation of the CVT according to the detected variation of the rotation speed of the output shaft of the CVT, and therefore the connect-in rotation speed of the generator unit keeps constant.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a mechanical stepless converter of a power generation system and a control method thereof, which are used for frequency control of output power of a generator set. Background technique [0002] According to different source motives, power generation systems can be classified as follows: [0003] (1) Turbine generator: driven by a steam turbine, usually horizontal, with a hidden pole rotor; [0004] (2) Hydrogenerator: driven by a hydroturbine, for large and medium-sized hydrogenerators, it is usually vertical, and the rotor is a salient pole type; [0005] (3) Nuclear power generator: There is no essential difference from conventional thermal power plant steam turbine generator, there are two kinds of full speed and half speed; [0006] (4) Gas turbine generator: It is a rotary power machine that compresses and heats the gas and expands it in the turbine to...

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Problems solved by technology

[0012] 2. The generator outlet voltage is the same as the user (or power grid) system voltage, and the maximum error should be within 5%;

Due to technical reasons, the current power conversion system is mainly imported from abroad. Even if there are a few domestic manufacturers of power conversion systems, the main power components used are almost all imported from abroad; and these power components Low overload capacity, high failure rate, easy to damage

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