3704E | TRICONEX | Constant power excitation control module

Description

3704E | TRICONEX | Constant power excitation control module

Constant power excitation control 3704E  mainly refers to the control of the excitation of the excitation machine in the main generator. Specifically, it refers to the constant power control of the diesel engine at different engine speeds when the locomotive is in traction conditions. The PLC obtains the given power at the current diesel engine speed based on the diesel engine speed detected in practice and the pre saved diesel engine power speed curve; Then, based on the collected main circuit voltage and traction motor current (6 motors), the actual power value is calculated. The fault between the two, as well as the fault between voltage value and voltage limit value, current value and current limit value, the minimum value is taken for PID scheduling operation. The excitation current of the main generator is adjusted through a chopper to adjust the output power of the main generator towards the power set value, For more information, please log in to Haohua Diantong to end the constant power control of the main generator. The control block diagram is shown in Figure 1. During the control process, the PLC monitors the voltage and current of the traction motor, and completes functions such as constant power, voltage limiting, current limiting, and fault removal of a single motor.
The 3704E of the auxiliary system includes the control of the diesel engine, the control of the air compressor, the control of sand spraying, and the control of the air source purification device. PLC completes useful control of various components of the auxiliary system based on the working logic of each component.
PLC automatically performs two-stage magnetic field weakening control based on changes in locomotive speed. The PLC has the function of first reducing power and then transitioning to reduce the current impact during the transition.