PID-based double closed-loop control method for diesel-electric-fuel combined power plant

Abstract

The invention aims at providing a diesel-electric-gas combined power device double closed loop control method based on PID. The diesel-electric-gas combined power device double closed loop control method based on the PID comprises the following steps of arranging two parallel running closed loop control circuits, namely, a shaft rotation speed control circuit 1 and a torque control circuit 2; adding a gas turbine output torque, which is calculated according to the shaft rotation speed control circuit 1, to a motor output torque, which is calculated according to the torque control circuit 2, toobtain a prime motor total output torque; collecting a transmission shaft rotation speed corresponding to the prime motor total output torque at this time; feeding back the total output torque valueand the transmission shaft rotation speed value to a controller; and carrying out collection and calculation in circulation till the adjusting control of the transmission shaft rotation speed and thetorque load distribution of a prime motor are finished. According to the diesel-electric-gas combined power device double closed loop control method based on the PID, a steady-state error of shaft rotation speed control does not exist; and a certain resisting ability to the interference on the shaft system is achieved. The torque can be accurately distributed to the gas turbine and the motor in real time according to the feedback torque signal. Compared with the traditional mechanical propulsion mode, the diesel-electric-gas combined power device double closed loop control method based on thePID has the advantages that the phenomenon of frequent rack adjustment does not exist and the service life of a rack adjusting mechanism is guaranteed.

Description

technical field [0001] The invention relates to a method for controlling a marine power plant. Background technique [0002] As a new type of marine power plant that emerged at the end of the last century, the diesel-electric-fuel combined power plant combines the advantages of electric propulsion and mechanical propulsion. Compared with the currently popular diesel-fuel combined power unit (CODAG), the diesel-electric gas combined power unit reduces navigation noise and fuel consumption, and at the same time simplifies the power system structure, reduces maintenance and support costs, and has higher power. Performance and economy can meet the requirements of high and low speed performance and large endurance of ships. Compared with more advanced all-electric integrated propulsion systems, the requirements for grid capacity are lower. Such a power plant that combines the strengths of traditional and modern propulsion methods is a good choice for ship power at present. [...

AI Technical Summary

Problems solved by technology

This method requires time-consuming and laborious calibration of the gas turbine, and cannot control the load distribution between the gas turbine and the electric motor, which may cause a prime mover to work under extreme conditions for a long time, thereby affecting the safety of the entire power plant

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