HDS02.1-W040N-HS12-01-FW -行业资讯

在采用调节阀控制液位时，这种来油量的干扰会导致原油缓冲罐的液位有较大的波动，也就是说液位控制回路的余差变大，远远超出了工艺要求的范围。在此种情况下，虽然可以通过增大比例作用来克服这种不利情况，但增大比例作用的副作用会使控制回路的稳定性变差，严重时发生等幅振荡甚至发散振荡的情形。采用变频器后，可根据系统的运行情况，适当改变变频器的〔加速/减速时间设定〕选项，当加速/减速时间设定得较小时，受控变量（液位信号）有一个小变化，变频器的输出信号就有较大的响应。反之，当加速/减速时间设定的较大时，变频器的输出信号响应会比较缓慢。
　　根据上位机从下位机上得到的实时液位曲线，利用经验法很快就可以完成控制回路IPD参数的调整。采用变频器和提升泵的组合来代替调节阀来控制缓冲罐的液位后，系统抗干扰能力得到加强，鲁棒性也得到进一步提高，彻底**了因来油的扰动而造成的液位大幅波动现象，控制回路的各项性能指标一**偏差、回复时间和余差都得到了较大提高。
　　改造后的控制回路取消了气动薄膜调节阀，节省了气动薄膜调节阀的投入费用；由于变频器的引入，提升泵的运行状况得到了较大的改观，检修周期也大大地延长，节约了提升泵的维修费用；而且采用变频器后，提升泵会根据缓冲罐液位的变化情况来变频运行，节约了大量的电费，取得了可观的经济效益。从系统改造至今，系统一直正常运行。实践证明这次改造是成功的，随着变频器性能的不断发展和完善，变频器的应用也越来越广泛。联合站液位控制系统的改造是诸多成功应用实例中的一例，希望这项工作能对国内同行有一些启示和帮助，为推进变频器的应用起到一定的作用。

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