大功率泵控马达调速系统控制策略研究

Research of Control Strategy of High-power Pump-control-motor Speed Governing System

泵控马达调速系统在大功率突变负载作用下的速度控制是决定系统性能的关键因素之一。以30 kW电液比例控制式泵控马达系统为研究对象,利用变量泵上集成的电液比例换向阀控制电流与输出流量间的线性关系,建立基于模糊PID控制算法下的恒转速输出的系统数学模型,运用计算机仿真技术,确立系统控制参数的最优自整定方案。结果表明,当系统在突加30 kW大功率负载时,频率瞬态调整率小于5%,频率响应时间小于3 s,显著提高了系统的瞬态指标。

Under the effect of high-power load-breaking,speed control is one of the key factors that determine the pump-control-motor speed governing system performance.Taking 30 kW electrohydraulic P-controlled pump-control-motor system as the research object,the variable-displacement pump integrated electrohydraulic P-controlled directional valve is utilized to control the linear relationship between control current and output flux.The mathematical models for constant speed output system are established based on the fuzzy PID control algorithm.Computer simulation technology is utilized to establish the optimal self-tuning control parameter.The results show that the frequency transient adjustment rate is less than 5%,and the frequency response time less than 3 s,when 30 kW high-power is loaded suddenly.The transient index of the system is improved significantly