热声发电系统自主协同起振控制策略

Autonomous Cooperative Onset Control Strategy of Thermoacoustic Electric Generation System

以热声发电系统(TAEGS)为应用背景,为了降低系统起振温度、缩短系统起振的时间,提出一种控制热声发电机电动运行将系统牵入谐振的自主协同起振综合控制策略,该控制策略以系统机械谐振时次级位移和初级电流相位差为90°作为频率跟踪控制的判定依据,通过采样次级位移和初级电流信号,经过改进二阶广义积分控制器输出相应的正交信号进行锁频,经过Park变换将交流信号变为直流信号,实现信号的无静差跟踪控制,进而使热声发电系统运行频率快速跟踪谐振频率。仿真分析和实验验证结果表明,所提出的起振控制策略既能使热声发电系统运行频率快速跟踪谐振频率,提高系统输出功率;又可改进二阶广义积分控制器,有效滤除检测信号的采样噪声和高频干扰,提高控制器的稳定性。

An autonomous cooperative onset control strategy of thermoacoustic electric generation system was presented in this paper to control the electric generator and bring TAEGS into resonance.The application background is TAEGS.In order to reduce the onset temperature and shorten the onset time of the system,according to the theory that phase angle between displacement and current is 90°,the quadrature signals of displacement and current were output by the improved second-order generalized integral controller to lock the frequency,and the AC signal was converted into DC signal by Park transformation.The zero steady-state error free tracking control of the signal was realized,and then the running frequency of TAEGS can quickly track the resonant frequency.The simulation and experimental results show that the proposed onset control strategy can make running frequency quickly track resonant frequency of TAEGS and improve the efficiency of the system.Besides,the second order general integral controller can filter out the sampling noise and high frequency interference of the signal,which improves the stability of the controller.