Research On Steady Voltage Output Control System Of Vehicle Power Take-off Power Generation

In order to improve the car power capacity and quality,to adapt to the modern on-board electrical equipment number,the trend of high precision,at the same time in order to reduce the traditional generator set noise and reduce the volume of the unit,there is a new form of power generation on-board power generator,which generated by the car engine power by power transmission drive power generation system of the generator to produce electricity.When parking,the engine speed is in an unstable idle state;When driving,the engine will change as the road conditions change.Thus it can be seen that no matter in the parking or running state,the on-board power generating set cannot send the three-phase AC power that can be used directly by the load.Therefore,it is of practical significance to study the voltage stabilizing output system of vehicle-mounted force-taking generator set,which can guarantee the performance of vehicle-mounted force-taking generator set,broaden the scope of application and improve the survivability of the unit.In this thesis,the prototype of a new type of high-power vehicle-mounted power generating set developed by ourselves is used as the experimental platform.First of all,the parking engine speed control system is studied,the electronic accelerator pedal principle and electrical characteristics are analyzed,and based on this,the parking engine speed control system based on PLC is designed to achieve a constant parking engine speed,which is the premise to achieve the parking voltage output.Aiming at the possible disturbance problem in the working process of the system,a brushless synchronous generator excitation control system was designed,and a new excitation controller was designed to improve the response speed of the system and realize the stable voltage output of the unit.Second,according to the rotational speed of driving moment change problem,put forward the rectifier +ZVT-Boost structure + inverter power transformation,a key part of the ZVT-Boost the working process of the analysis,and puts forward independent of ZVT-Boost closed-loop control strategy,the improved BP neural network PID control based on conjugate gradient,so as to improve the system performance,to realize driving voltage output unit.In this thesis,the performance and feasibility of the proposed method are tested theoretically and practically through simulation verification in MATLAB/Simulink environment and experimental verification of two different engine operation modes on the prototype.The simulation and experimental results show that the system has good static and dynamic performance,and can achieve stable output under the condition of constant/variable engine speed.The research results of this thesis show that the designed on-board power generating set is a high-performance scheme that can be applied to on-board power supply and has a good development and application prospect.There are 46 figures,7 tables and 60 references in this thesis.