Operation and switching method for different propulsion modes of direct-current networking hybrid power propulsion system

Abstract

The invention discloses an operation and switching method for different propulsion modes of a direct-current networking hybrid power propulsion system. According to the frequency converter, a core control mode of the shaft motor is divided into two parts, namely a rotating speed control mode and a torque control mode, the rotating speed control mode controls the output torque (power) of the shaftmotor by adjusting the rotating speed of the motor, and the frequency converter is suitable for being used in a PTH mode; the torque control mode is to judge the torque (power) required to be output by the shaft motor according to the rotating speed, and is suitable for being used in a PTI mode. Furthermore, the rotating speed control mode ensures the independent control function of shaft motor speed regulation in the PTH mode; the torque control mode ensures that the shaft-driven motor is always in an'assisting 'state in the PTI mode, the possibility of sudden power change and reverse work shutdown of a diesel propulsion main engine during combined arrangement is eradicated, the safety of the direct-current networking hybrid power propulsion system is improved, and the two control functions can be instantaneously and seamlessly switched according to working condition requirements.

Description

technical field [0001] The invention relates to the field of ship hybrid propulsion systems, in particular to a method for operating and switching between different propulsion modes of a DC networked hybrid propulsion system. Background technique [0002] For the marine hybrid propulsion system, there are multiple propulsion modes, such as PTH mode, PTI mode and host mode, and different modes can be switched between each other. The main engine mode refers to the traditional propulsion method, that is, the propulsion power of the ship is completely provided by the main engine (diesel unit). PTH mode means that the main engine stops working, and the propulsion power of the ship is completely provided by the shaft motor, that is, POWER TAKE HOME, or PTH for short. PTI mode means that the main engine and the shaft motor work at the same time, and the two work together to propel the ship's navigation, that is, POWER TAKE IN, PTI for short. [0003] With the rapid development of...

AI Technical Summary

Problems solved by technology

The PTI / PTO mode switching control device and its control method based on PLC control described in the patent ZL201110446537.7 can realize the switching between different modes of the ship propulsion system, but it does not involve the shaft motor during the switching process. Specific control method

Meng Xianyao and others published the paper "Automatic Control System of Multipurpose Workboat for Offshore Operations (3) - Analysis of Shaft Generator Control Mode" published in "World Shipping" (No. 5, 2004), introducing the control of the clutch through PLC, Realize the control of the shaft generator, but the control process takes a long time, and there will be power output breakpoints during the mode switching process

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