Abstract: To address insufficient hysteresis nonlinearity compensation accuracy and deteriorated dynamic response under complex disturbances in wide-range flow control of microfluidic proportional valves for aerospace electric propulsion storage and feed systems, a composite control algorithm is proposed integrating improved Bouc-Wen hysteresis model feedforward compensation with feedback coordination. An asymmetric rate-dependent Bouc-Wen hysteresis model is developed by incorporating dynamic rate compensation terms and asymmetric hysteresis operators to reconstruct hysteresis loops. A modified particle swarm optimization (IPSO) algorithm is implemented for parameter identification, reducing mean square error by 43.2% compared with standard PSO. A feedforward-feedback composite controller is designed based on this model, synergistically optimizing hysteresis compensation and PI error correction. Experimental validation demonstrates that step response time is reduced from 1.1s (PI control) to 0.425s (61.4% improvement), that root mean square error in square-wave tracking decreases from 1.83kPa to 1.2kPa (34.4% reduction), and that recovery time under 350kPa step disturbance reaches 0.24s with overshoot consistently below 0.8%. The proposed improved Bouc-Wen hysteresis modeling and dynamic gain hybrid control method addresses the critical challenge of synergistic optimization between precise nonlinear compensation and dynamic robustness. Compared with existing composite strategies, dynamic response speed increases by over 30%, providing a high-precision (steady-state error <1%), strong anti-disturbance (overshoot <1%) engineering solution for spacecraft propulsion systems across wide operational domains.

Key words: storage and feed system, fluid proportional valve, hysteresis model, system identification, hybrid control