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当四容水箱系统包含非最小相位零点时,基于模型的控制策略的液位控制效果不理想,因此本文提出了更为实用的相平面分区法。它能直接根据当前的误差和误差变化率计算出与此相适应的控制量,不需要对系统建模,具有很强的抗干扰性,适合于对耦合系统进行控制;同时针对多容水箱的时滞问题,通过加入微分反馈,抑制了时滞引起的超调。仿真结果表明,该策略2个液位控制回路的累积误差比动态矩阵控制法分别减少11%和12%,比改进的解耦法分别减少20%和38%。
When the four-tank system contains non-minimum phase zero points, the model-based control strategy is not effective in level control. Therefore, a more practical phase-plane partitioning method is proposed in this paper. It can directly calculate the corresponding control volume according to the current error and error rate of change, does not need to model the system, has strong anti-interference, suitable for the control of the coupling system; at the same time for the multi-capacity tank Time-delay problems, by adding the differential feedback, inhibit the overshoot caused by the delay. The simulation results show that the cumulative error of the two liquid level control loops of this strategy is reduced by 11% and 12% respectively compared with the dynamic matrix control method, which is 20% and 38% lower than the improved decoupling method respectively.