Alternating current excitation transformation method and system of grid-connected direct current excitation synchronous generator set

Abstract

The invention discloses an alternating current excitation transformation method and system of a grid-connected direct current excitation synchronous generator set. The system comprises a direct current excitation synchronous generator, a rotor alternating current winding, a rotor iron core, an alternating current-direct current-alternating current bidirectional converter, an electric brush, a slip ring, a measurement control system, a prime motor and a transmission mechanism of the prime motor. Most equipment and parts of an original synchronous power generation system are reserved, only the rotor main magnetic poles of the original synchronous power generation set are replaced by the rotor alternating current windings and the rotor iron cores with the same number of poles as the stator windings, the original system is slightly modified, and the modification cost is low. The technical means is simple and easy to implement, when the rotor operates at different rotating speeds, the rotating magnetic field rotating speed on the rotor is consistent with the rotating magnetic field rotating speed of the stator by controlling alternating current exciting current parameters, then the operating efficiency of a prime motor and a whole power generation system is improved, and the operating condition of an original synchronous generator set is improved; the operation stability of the generator set is improved.

Description

technical field [0001] The invention relates to the fields of DC excitation and AC excitation power generation, in particular to an AC excitation modification method and system for a grid-connected DC excitation synchronous generator set. Background technique [0002] Synchronous generator sets have been widely used in energy development such as hydroelectric power generation, wind power generation, and thermal power generation due to their advantages of large capacity, adjustable active power and reactive power. Due to the constraints of grid frequency and grid operation conditions, the prime movers driving these synchronous generators have been running at synchronous speed and cannot always be at the optimal speed, which leads to the deterioration of the working conditions of the generator set and the reduction of efficiency, which affects the generator set. safe operation. [0003] With the development of current energy development, in order to improve the energy convers...

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Problems solved by technology

Due to the constraints of grid frequency and grid operation conditions, the prime movers driving these synchronous generators have been running at synchronous speed and cannot always be at the optimal speed, which leads to the deterioration of the working conditions of the generator set and the reduction of efficiency, which affects the generator set. safe operation of

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