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Diesel-electric-gas combined power device double closed loop control method based on PID

A dual closed-loop control, combined power technology, applied in the direction of propulsion unit engine, engine using propulsion unit combination, transportation and packaging, etc., can solve the problem of time-consuming and laborious gas turbine, affecting the safety of power plant, and inability to control the load of gas turbine and motor Distribution and other issues to achieve the effect of guaranteeing life

Active Publication Date: 2018-07-24
HARBIN ENG UNIV
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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

Method used

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  • Diesel-electric-gas combined power device double closed loop control method based on PID
  • Diesel-electric-gas combined power device double closed loop control method based on PID
  • Diesel-electric-gas combined power device double closed loop control method based on PID

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Embodiment Construction

[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0025] combine Figure 1-4 , the present invention adopts a PID-based double-closed-loop control method, that is, torque-shaft speed double-closed-loop. The direct output of each ring is the change rate of the controlled object, for the gas engine, it is the change rate of the fuel injection quantity, and for the electric motor, it is the change rate of the set power. Among them, the torque loop determines the change rate of the controlled object according to the preset torque distribution ratio between the gas / electric machine and the feedback torque; the shaft speed loop is determined according to the difference between the set shaft speed and the feedback shaft speed The rate of change of the controlled object. Comprehensively consider the results of the two loop feedbacks to determine the final output. At the same time, the shaft speed control and load dist...

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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. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H21/20B63H21/21
CPCB63H21/20B63H21/21B63H2021/205B63H2021/216
Inventor 王志涛王维天范阔李铁磊李淑英李健马文奇雷昊达
Owner HARBIN ENG UNIV
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