重庆大学-过程控制-process-control-中文-翻译-第十章
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If fluctuation波动 in the fuel gas flow rate燃气流速,
the system will not counter计数 the disturbance until
the controller senses that感知 the temperature has deviated From偏离 the set point (Tsp)
Multiloop Systems
Cascade Control
Cascade control solution
It consisting of包含:
➢ master (primary) loop ➢ slave (secondary) loop
TT: temperature transducer 温度传感器
S-loop control solution单环开环控制
1. measure T by TT, 2. compute p by TC,
TT TC
Tsp
3. send the p to the valve
Multiloop Systems
Cascade Control
Motivation of动机 Cascade Control
A secondary variable 次要变量must
3. Indicate指出 the occurrence of发生的 an important disturbance 4. have a causal relationship因果关系 from primary to secondary
(cause → effect) 5. have a faster response than the primary
Multiloop Systems
Improving the DR Performance
Cascade Control
Control of a furnace temperature；炉温
DR: Disturbance Rejection
Multiloop Systems
Improving the DR干扰抑制 performance
Process Control
陈刚
College of Automation Chongqing University
Multiloop Systems Outline
Improving （disturbance rejection干扰抑制)performance
cascade control级联控制 feedforward control,前馈控制 ratio control, and 比例控制 time delay compensation时间延迟补偿with Smith predictor. smith 预估补偿
Cascade Control
Cascade control solution
TC in master-loop sends its signal to slave-loop副回路,
▪ in terms of依据 the desired flow rate (casual relation) ▪ the signal is the set point of the secondary flow controller (FC).
减少来自被控变量的干扰.
2. accomplish a faster response in the valve, 3. make the system more stable
来自百度文库
Multiloop Systems
Cascade Control
Example 1: the furnace temperature control
FC in slave loop adjusts the regulating valve调节阀
▪ FC compares the desired and measured fuel gas flow rates
▪ responding immediately to fluctuations in the fuel gas flow 立即对波动的燃气速率做出反应
the master loop uses a PI controller,
From the reduced block diagram
E=R-C
Multiloop Systems
Cascade Control
Cascade control solution The closed-loop characteristic polynomial特征多项式
Comments on the slave-loop 1. reducing disturbance in the manipulated variable被控变量
to ensure that the proper amount of数量的 fuel is delivered.
Multiloop Systems
Cascade Control
Cascade Design Criteria设计标准
Cascade is desired when
1. single-loop performance unacceptable 2. a measured variable is available 测量值可用
Multiloop Systems
Cascade Control
Cascade Control Solution Reducing the block diagram方块图
Setting Gm1=Gm2=1
where
Multiloop Systems
Cascade Control
Reducing the block diagram
FT: flow transducer TC: temperature controller FC: fuel gas controller
Two measured variables
fluctuation波动
disturbance is now in slave loop 副回路
Multiloop Systems
the system will not counter计数 the disturbance until
the controller senses that感知 the temperature has deviated From偏离 the set point (Tsp)
Multiloop Systems
Cascade Control
Cascade control solution
It consisting of包含:
➢ master (primary) loop ➢ slave (secondary) loop
TT: temperature transducer 温度传感器
S-loop control solution单环开环控制
1. measure T by TT, 2. compute p by TC,
TT TC
Tsp
3. send the p to the valve
Multiloop Systems
Cascade Control
Motivation of动机 Cascade Control
A secondary variable 次要变量must
3. Indicate指出 the occurrence of发生的 an important disturbance 4. have a causal relationship因果关系 from primary to secondary
(cause → effect) 5. have a faster response than the primary
Multiloop Systems
Improving the DR Performance
Cascade Control
Control of a furnace temperature；炉温
DR: Disturbance Rejection
Multiloop Systems
Improving the DR干扰抑制 performance
Process Control
陈刚
College of Automation Chongqing University
Multiloop Systems Outline
Improving （disturbance rejection干扰抑制)performance
cascade control级联控制 feedforward control,前馈控制 ratio control, and 比例控制 time delay compensation时间延迟补偿with Smith predictor. smith 预估补偿
Cascade Control
Cascade control solution
TC in master-loop sends its signal to slave-loop副回路,
▪ in terms of依据 the desired flow rate (casual relation) ▪ the signal is the set point of the secondary flow controller (FC).
减少来自被控变量的干扰.
2. accomplish a faster response in the valve, 3. make the system more stable
来自百度文库
Multiloop Systems
Cascade Control
Example 1: the furnace temperature control
FC in slave loop adjusts the regulating valve调节阀
▪ FC compares the desired and measured fuel gas flow rates
▪ responding immediately to fluctuations in the fuel gas flow 立即对波动的燃气速率做出反应
the master loop uses a PI controller,
From the reduced block diagram
E=R-C
Multiloop Systems
Cascade Control
Cascade control solution The closed-loop characteristic polynomial特征多项式
Comments on the slave-loop 1. reducing disturbance in the manipulated variable被控变量
to ensure that the proper amount of数量的 fuel is delivered.
Multiloop Systems
Cascade Control
Cascade Design Criteria设计标准
Cascade is desired when
1. single-loop performance unacceptable 2. a measured variable is available 测量值可用
Multiloop Systems
Cascade Control
Cascade Control Solution Reducing the block diagram方块图
Setting Gm1=Gm2=1
where
Multiloop Systems
Cascade Control
Reducing the block diagram
FT: flow transducer TC: temperature controller FC: fuel gas controller
Two measured variables
fluctuation波动
disturbance is now in slave loop 副回路
Multiloop Systems