FOXBORO 0399085B 0303440C+0303458A模拟量输入模块

FOXBORO 0399085B 0303440C+0303458A模拟量输入模块DEH升速过程采用主汽门(TV)控制，当升速到2950 r／min时，切换阀门，由主汽门控制切换为高压调门(GV)控制，后定速3000 r／min。
常规的阀切换经常由于TV与GV的开起和关闭速率配合不好而造成的汽机转速波动很大[1]，为此，通过改进阀切换控制方案：阀切换开始时，开高调门系数由1逐渐变为0，并且转速PID同时作用于TV和GV，即：
GV阀位输出＝开高调门系数×100＋（1－开高调门系数）×阀位给定（转速PID输出）
TV阀位输出＝（1－开高调门系数）×100＋开高调门系数×阀位给定（转速PID输出）
采用新的阀切换控制方案后，在机组的各次起动中，汽轮机转速在DEH进行阀门切换过程中非常稳定，转速波动不超过5 r／min，满足了DEH 汽轮机转速控制的要求。
双冗余LVDT低选功能设计
LVDT双通道高选位置反馈方式，若两个LVDT同时断线，则油动机将全开，因此不满足伺服系统安全设计原则。因此将原LVDT断线检测判断后，拉低LVDT解调后的直流电压，改为拉高LVDT直流电压；将原LVDT直流电压高选电路，改为低选电路，这样若单个LVDT断线，该LVDT直流电压大于阀位指令电压，由于采用低选电路，将不影响伺服系统的正常工作。若两个LVDT均断线，LVDT直流电压大于阀位指令电压，油动机将全关。这样修改后可同时满足安全和冗余设计原则。The DEH speed raising process is controlled by the main throttle valve (TV). When the speed rises to 2950 r/min, the valve will be switched. The main throttle valve control will be switched to the high pressure control valve (GV) control, and the final speed will be fixed at 3000 r/min.
Conventional valve switching often results in large turbine speed fluctuation due to poor matching of TV and GV opening and closing rates [1]. Therefore, the control scheme of valve switching is improved: at the beginning of valve switching, the opening high regulating valve coefficient gradually changes from 1 to 0, and the speed PID acts on TV and GV simultaneously, namely:
GV valve position output=open high regulating valve coefficient × 100 ＋ (1 － coefficient of opening high regulating valve) × Valve position setting (speed PID output)
TV valve position output=(1 - coefficient of opening high regulating valve) × 100+coefficient of opening high regulating valve × Valve position setting (speed PID output)
After adopting the new valve switching control scheme, during each startup of the unit, the turbine speed is very stable during the valve switching process of DEH, and the speed fluctuation does not exceed 5 r/min, meeting the requirements of DEH turbine speed control.
Design of dual redundancy LVDT low selection function
LVDT dual channel high selection position feedback mode, if two LVDTs are disconnected at the same time, the hydraulic servo motor will be fully opened, so it does not meet the safety design principle of the servo system. Therefore, after the original LVDT disconnection detection and judgment, the DC voltage after LVDT demodulation is pulled down and the DC voltage of LVDT is pulled up; The original LVDT DC voltage high selection circuit is changed to a low selection circuit, so that if a single LVDT is disconnected, the LVDT DC voltage is greater than the valve position command voltage. Since the low selection circuit is used, the normal operation of the servo system will not be affected. If both LVDTs are disconnected, and the LVDT DC voltage is greater than the valve position command voltage, the hydraulic servo motor will be fully closed. In this way, both safety and redundancy design principles can be met after modification
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