Research On Power Monitoring And System Control Of Hydraulic Power System Based On Virtual Instrument

Under the background of the national 'Twelfth-Five Year' plan to construct a resource saving and environment friendly society, against to the problems of original hydraulic power system test bench in energy saving research, the power monitoring and energy-saving control hydraulic power systems based on Virtual Instrument is proposed in this thesis for the purpose of hydraulic equipment energy-saving research, and the test and control device are improved. The improved system can realize the hydraulic equipment typical load simulation, motor stepless speed regulation and flow adaptive control, monitor the electric power, power factor, fluid power and system efficiency.etc. The thesis can be divided into following areas:1. Combined with Matlab/simulink, a asynchronous motor/permanent magnet synchronous motor-gear pump hydraulic power model is established according to the control principles of space vector PWM and gear pump mathematical models, and the results of these two simulations are analysised by comparison.2. Against to the defects of original hydraulic power system in energy-saving research, the power monitoring and energy-saving control hydraulic power systems based on Virtual Instrument is proposed. What's more, the virtual instrument software and hardware platform and the sensors are introduced, and then the pressure and flow sensor are calibrated.3. Using the graphical programming language labview and modular design technology, the upper computer software of the hydraulic power system power monitoring and system controlling is compiled. The hydraulic power system load simulation, motor speed control, flow adaptive control and power monitoring are tested by experiments.4. From the energy consumption, made the comparison test between asynchronous motor and permanent magnet synchronous motor hydraulic power systems, throttle governing and frequency control hydraulic power systems. The results indicated that the frequency control technique and the permanent magnet synchronous motor could evidently improve the efficiency of hydraulic power system, and had excellent dynamic performance.