Prakties 2 - Electrical, Electronic and Computer Engineering

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Figure 2: Realisation of controller with and represented by resistors and capacitors. The implementation of the controller is shown in Figure 1 and Figure 2. 4. Closed Loop System The closed loop system is shown in Figure 3 and can be implemented as in Figure 4. Figure 3: The closed loop system. Figure 4: The closed loop system for practical implementation. The summation function can be implemented as in Figure 5. Set . is the feedback signal, is the set point input and is the input of the controller. Control Systems (EBB 320) Practical 2 Guide 2012 Page 4
Figure 5: The implementation of the summation function. 5. Preparation All pre-assignments must be done in the lab book (of each student) and will be marked during the practical session. Each member of the group must participate in the preparation. 1. Design (i.e. calculate the tuning parameters) a PID controller by simulating the step response of the plant of practical 1, and making use of the Cohen-Coon reaction curve method. Use the system with the Padé approximation applied. 2. Design a PID controller from the Ziegler-Nichols oscillation method by theoretically calculating the ultimate controller gain and ultimate oscillation period from the transfer function of the system. Use the system with the Padé approximation applied. 3. Compute the capacitor and resistor values for each of the designed PID controllers. 4. Simulate the closed loop system using both controllers (see Figure 4). Measure the peak time ( ), percentage overshoot ( ) and steady-state-error from each simulation. (Note that the simulations may be done in PSpice or Simulink. The setup and the results of each simulation should be explicitly indicated.) 6. Lab assignments 1. Build the Cohen-Coon controller you designed in 5.1 (use own components!). 2. Measure (look on oscilloscope) the system the peak time ( ), percentage overshoot ( ) and steady-state-error and compare this with the controller from your simulated response. The definitions of these quantities may be found from Nise, (2008). (Note: Please build the Cohen-Coon and Ziegler-Nichols controllers separately such that they can be interchanged easily in the demo. They should however be implemented on the same plant). 3. Build the Ziegler-Nichols controller (as designed in 5.2). 4. Measure , and the steady-state-error for the system with the Ziegler-Nichols controller implemented, and compare this with the simulation results found in 5.4. Control Systems (EBB 320) Practical 2 Guide 2012 Page 5
Page 1 and 2: Departement Elektriese, Elektronies
Page 3: The numeric value for the ultimate

Prakties 2 - Electrical, Electronic and Computer Engineering

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