A frequency conversion control method for irregular small water tank liquid level
A frequency conversion control, small water tank technology, applied in liquid level control, non-electric variable control, control/regulation systems and other directions, can solve the problems of poor anti-interference ability, large fluctuation of liquid level controlled by frequency converter, large flow, etc., to avoid Tracking lag, improving tracking performance, avoiding the effect of level misalignment
Active Publication Date: 2020-07-03
金川集团信息与自动化工程有限公司
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Problems solved by technology
[0009] The purpose of the present invention is to provide a frequency conversion control method for the liquid level of irregular small water tanks, which mainly solves the problems of large fluctuations in the liquid level controlled by the frequency converter and poor anti-interference ability due to the large flow and irregular shape of small water tanks
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Embodiment 1
[0095] Step 1. Setting of liquid level gauge:
[0096] Such as figure 1 As shown, two liquid level gauges with different measurement principles and performances are installed on the condensate tank (2). The first liquid level gauge (3) and the second liquid level gauge (4) are in a mutual backup relationship. In this embodiment The first liquid level gauge 3 is a magnetic flap liquid level gauge, and the second liquid level gauge 4 is a differential pressure liquid level gauge;
[0097] Step 2. Selection of liquid level gauge:
[0098] When the two liquid level gauges are normal, the operator selects one of the liquid level gauges and manually turns on the liquid level selection switch 10. 10 Switch to the standby liquid level gauge; at the same time, input parameters in the control system (5) to enable the system to automatically judge the state of the currently used liquid level gauge, and send a signal to the control system 5 through the control cable when the currently u...
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The invention discloses an irregular micro water tank liquid level frequency conversion control method, belongs to the automatic control field and solves problems of large frequency converter control liquid level fluctuation and poor anti-interference capability caused by large flow and irregular shape of small water tanks in the prior art. The method comprises steps of setting liquidometers, selecting a liquidometer, determining common linear intervals among pumps, designing a PID algorithm, automatic control on standby switching among the pumps, stop and start, setting control intervals and adjusting PID. The method is advantaged in that liquid level imbalance caused a fault of the liquidometer can be effectively avoided, large liquid level fluctuation caused by lag tracking of the frequency converter can be effectively avoided, and adjusting interference of irregular liquid level change caused by change of shapes of the water tanks can be effectively avoided.
Description
technical field [0001] The invention specifically relates to a frequency conversion control method for the liquid level of an irregular small water tank, belonging to the field of automatic control. Background technique [0002] Due to space reasons, the volume of the condensate tank under the extraction steam turbine is only 1m in the liquid level measurement area. 3 , but the liquid flow is 65m 3 / h, the shape of the condensate tank is a groove with both ends sealed, the length and width are 1m, the bottom is arched, the top is a bell mouth, the shape of the liquid level control area is basically regular, and the water tank is under negative pressure (-90—— 80KPa), the liquid level measurement uses a magnetic flap liquid level gauge. The original liquid level control adopts 3 power frequency electric pumps (rated 48m 3 / h) control, dual-use and one standby, the start and stop of the pump is controlled by the change of the upper and lower limits of the liquid level (a to...
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IPC IPC(8): G05D9/12
CPCG05D9/12
Inventor 李锐李燕军
Owner 金川集团信息与自动化工程有限公司