Variable-frequency permanent-magnet hydropower system and control method thereof

Abstract

The invention discloses a variable-frequency permanent-magnet hydropower system and a control method thereof. The system is simple in structure, relatively small in size and convenient to mount and overhaul, the installed capacity per unit area of a hydropower plant is increased, the system economy is increased, variable-speed constant-frequency regulation is performed by the aid of a matrix converter, the power generation quality and efficiency of the system are improved, automatic closed-loop control on two layers including the mechanical layer and the electrical layer of the variable-frequency permanent-magnet hydropower system is realized, the necessary hardware system structure is realized, protection is performed in electrical and mechanical aspects, and the running stability and safety of a unit are improved. The control method of the variable-frequency permanent-magnet hydropower system includes the step of force application control, water turbine force application control is performed, the water turbine blade position is adjusted at any time through a runner blade comprehensive controller, a water flow comprehensive controller is started to select the optimal water flow soas to control a water turbine to apply force, and the impact of a water flow to the hydropower system is reduced while the highest energy is obtained.

Description

technical field [0001] The invention relates to hydropower generation technology, in particular to a variable frequency permanent magnet hydropower generation system and a control method thereof. Background technique [0002] With the continuous development of motor technology and the continuous improvement of the performance of permanent magnet materials, the characteristics of permanent magnet motors have been continuously optimized, especially after the introduction of direct drive permanent magnet power generation technology, due to its compact structure, small size, reliability and system efficiency The high characteristics have been widely valued by experts and scholars at home and abroad. The promotion and application of direct drive permanent magnet technology in related fields has gradually become a trend, and has been widely used in the wind power industry. [0003] At present, traditional DC generators or traditional synchronous generators are mostly used in hydro...

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Problems solved by technology

[0003] At present, traditional DC generators or traditional synchronous generators are mostly used in hydropower systems. The generator sets are often too large and inconvenient for installation and maintenance, especially for small and medium-sized hydropower systems in low water levels, small drops, and dry seasons. In such environments, it is difficult for the traditional hydropower system to achieve the ideal operating state. In addition, the traditional hydropower needs to install electric excitation windings and supporting excitation devices, which greatly limits the flexibility of the motor structure. The gearbox structure reduces the power generation efficiency and increased risk of failure

In addition, generally speaking, the development of water energy automatic management and control system technology is slow at present. Most of the hydraulic system control automation technology has not been improved in time. Poor, lack of fault tolerance

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