基于串级PID的天然气发动机恒速控制应用研究

The Application of Constant Speed Control in Natural Gas Engines based on Cascade PID

发电机组要求输出的电压和频率保持在一定的范围内,因此驱动发电机组的发动机在运行状况或负载发生变化时,转速必须稳定在设定的范围内,为此在电子节气门控制的天然气发动机上开发了一种基于串级PID的恒速控制系统。天然气发动机台架试验结果表明,当发动机运行状况或外界负载发生变化时,串级PID恒速控制系统对发动机转速的调节具有较小的超调和较快的稳定时间等优点。

The engine speed must be stable at the range of the set speed when the load or operating conditions of the engine which drive the generator unit change, because the output voltage and frequency of generators should be kept in a certain range. In this paper a constant speed control system based on cascade PID is devel- oped for a natural gas engine with electronic throttle. The results of the engine test bed show that： when the load or operating conditions of the engine change , with the cascade PID constant speed control system, the regulation of the engine speed has a smaller overshoot and faster settling time