Questions tagged [pid-controller]
A PID controller is a (closed) control loop feedback mechanism. It is used in industral control for proportional, integral and derivative feedback.
626
questions
0
votes
2
answers
41
views
Implementing feedforward control in heated box
I'm making a temperature-controlled box. Issue I'm having is that it overshoots and undershoots a lot because it takes a long time between turning the heater on/off and seeing a difference in ...
- 309
0
votes
2
answers
82
views
If you autotune a PID while the controller is live what is the worst that can happen?
I am new to using PID in studio5000. I want to autotune a heater with a CV that stays at 100, never reaching the SP but just under it.
I think that might help the controller finally reach the SP.
What ...
- 1
0
votes
0
answers
14
views
Simulink question about a electrotechnical system (simple autonomous vehicle)
I am rather new to all the simulation work and its complex applications. I have been tasked to work on a rather complex project that is creating autonomous vehicle digital twin and then anayaize how ...
- 1
1
vote
0
answers
46
views
How to tune PID (KP, KI, KD) for an actuator attached to a butterfly valve
I'm currently tuning an actuator that was unstable. The person before me set the values to: KP = 0.04, KI = 0.07 and KD = 0. The system would oscillate between 90% open and 10% open and never reach ...
- 11
0
votes
0
answers
37
views
Problem with the current in a multiphase buck converter
I am a student of electrical and computer engineering and am currently working on a project that involves the study of a multiphase buck converter or synchronous buck converter (2 phases, in my case).
...
- 51
0
votes
0
answers
29
views
Setting the parameters of PID for 10 °C set point
I have a PID controller (REX C100), connected to a TEC1-12706 (Thermal Electric Cooling) and a thermocouple K-type. I want to set 10 °C on my PID.
The problem is that the actual temperature in PID is ...
- 1
0
votes
0
answers
38
views
Sensored Brushless DC Motor Back EMF Problem
I am working on the current control of a BLDC motor with a speed of 12000rpm. The current controller in the system is designed as PI. I give a reference value of 10A to control the motor and the ...
- 1
0
votes
0
answers
20
views
Understanding the effect of HPF on the amplitude and phase control in STM32
I am using a STM32 to control amplitude and phase of a signal when passed through a RC circuit(LPF) which later will be replaced with a tip tilt mirror.
I have a STM32 which has the code implemented. (...
- 135
0
votes
1
answer
31
views
Quick PMSM FOC PI controler design
For a Simulink Model I am looking for a quick and easy way to estimate PI-controller parameters for a speed control loop and Id and Iq controler of a PMSM using FOC.
I don't have a real motor just the ...
- 75
0
votes
2
answers
91
views
PID control of a reversible Peltier (using Arduino PID_V2 library)
I have a box of water, which temperature I have to regulate to a ramping setpoint which could go both below and above the ambient temperature. So I have decided to use a Peltier for both cooling and ...
- 51
0
votes
1
answer
57
views
Integral Controller design
For this system, what method do I use to select a value of Ki? Gh and Gt are first-order blocks with time constants Th and Tt-
- 21
0
votes
0
answers
52
views
Stuck during designing a PI Controller
I'm trying to design a PI Controller on the basis of this paper: "Design of robust PI control systems based on sensitivity analysis and genetic algorithms." by Jau-Woei Perng • Shan-Chang ...
- 1
1
vote
0
answers
62
views
How to suppress oscillations of the LC circuit current?
I have a following circuit
which basically consists of three individual power electronics converters
Converter_01
In case \$v_1 > v_2\$ it operates as a single phase diode bridge rectifier ...
- 1,061
0
votes
0
answers
98
views
PID control with PIC microcontroller
I'm relatively new in C program ( I'm using MPLAB X IDE XC8 ), and first time trying to make a PID control, using a PIC16F15223
This is what I want to make:
The pic has an analog input that reads a ...
0
votes
1
answer
96
views
Modelling the PID controller for a Buck Converter from a given schematic
I followed a document to implement a PID controller for a Si MOSFET based buck converter as the traditional multistep analog PID converter was not giving any good results for some reason. The document ...
- 1
0
votes
0
answers
32
views
CV state lead-acid battery charge from solar panel
I simulate the charging of a lead-acid battery, using MPPT algorithms, Buck converter, a PID regulator and a solar panel. In the CC stage everything is perfect. The battery is charged up to 14.4V, so ...
- 1
0
votes
0
answers
79
views
Ziegler–Nichols method of PID auto tuning
I am working on a problem where I need to implement auto tuning PID control using Ziegler–Nichols method. Basically I want to control temperature using it.
The PID has to be implemented with the ...
- 25
1
vote
1
answer
61
views
Determine derivative time of real PID controller
I need help determining the derivative time of a real PID controller.
Above me is an ideal PID controller. In my case I have another resistor (let us say R0) before R1 and Cd serial.
How do I now get ...
0
votes
0
answers
74
views
Understand derivative circuit with frequency filter
I am trying to understand a circuit which is part of a PID controller. Input to (this part) of circuit is error signal (difference between target and present level). "DIF" part of circuit ...
1
vote
1
answer
92
views
Temperature control of a system with variable setpoint and variable outside temperature
I'm building an insulated box in which I have about 5-6 liters of water which will be cooled/warmed by a Peltiers, driven by variable current.
The setpoint will vary between 16 and 26 degrees C, and ...
- 51
0
votes
0
answers
53
views
PID output to motor rpm
I am working on my project "Control design for tilt rotor." The UAV has 4 tilt rotors and I am using PID to controller for position and attitude control (outer and inner loop).
...
1
vote
0
answers
87
views
What is the Z transform of the discrete PI control model？
I have a discreate PI controller implemented in stm32 MCU, it has the following form:
$$
PI=K_p\cdot[r(t_i)-y(t_i)] + (K_I)\cdot\sum_{n=0}^{i}[r(t_n)-y(t_n)]\cdot\Delta t
$$
where
\$r(t_i)\$ is the ...
- 11
1
vote
1
answer
96
views
Does the idea of bandwidth make sense for a system with an infinite DC gain?
I'm thinking specifically of systems with ideal PID controllers. The transfer function will always have an integrator term, which, if I understand correctly, means it will always have infinite DC ...
1
vote
1
answer
51
views
The effect of the coefficient of the derivative part in PID control
I am learning about control systems, specifically PID control.
I am a little confused by the coefficient in front of the derivative term. My lecturer said a positive coefficient for the derivative ...
0
votes
0
answers
102
views
How to design a PI/PID controller with a given bandwidth and phase margin?
I've read the article, Introduction: PID Controller Design, which explained really well the effect each branch of the controller has on the rise time, settling time, overshoot, and error, which gives ...
4
votes
1
answer
583
views
What's the point of the proportional branch in a PI controller?
I just watched this MatLab video on the basics of how PI/PID controllers work and for the most part it makes sense. They started with an example with just a P controller and showed that, while it ...
1
vote
0
answers
112
views
How does the incremental form of the PID controller work?
I have a question regarding the features of the so called incremental (velocity) form
of the PID controller. As far as I understand this form in correct manner it can be
described via this pseudocode
<...
- 1,061
0
votes
1
answer
169
views
Designing a PID controller using uA741 opamp using ltspice [closed]
I want to design a PID controller I created the design with all the components but when I run my ac sweep my output graph of Vout/Vin is not correct as a PID controller should function but when i run ...
0
votes
0
answers
78
views
PI integral anti-windup with dynamic saturation limit
I have a controller to control the power output of a solar inverter and I'm not sure how to implement the integral anti-windup. The problem I'm facing is the actual output power is dependent on the ...
- 1
0
votes
0
answers
42
views
How to achieve smooth transitions between operational modes in the bidirectional buck-boost dc-dc converter?
I have below given DC-DC converter
Until this moment I have used this converter for current control either in the buck or in the boost mode in the indicated current flow direction. The control ...
- 1,061
2
votes
3
answers
87
views
Proportional control: steady state explanation
In this video, a scenario is given to show the failings of using solely proportional control.
Consider a drone that must be made to hover at an altitude of 100m. The RPM required to hover the drone is ...
7
votes
3
answers
2k
views
Can I use a motor as a rotary encoder?
Let me preface this by saying that I'm not an expert, nor do I conclusively understand how op-amps work, but I have a strong suspicion that this should be possible, at least crudely.
I have this idea ...
0
votes
2
answers
79
views
Intuitive advice needed regarding PID controller for *centering* a Balanced Inverted Pendulum
I have built for myself an inverted pendulum balancer. It comprises a straight, horizontal metal track upon which rides a carriage which is driven by a stepper motor. The pendulum is mounted on the ...
- 434
0
votes
1
answer
63
views
Implementation of Integrator in PID control
I have a doubt in implementing PID control. I referred many documents and video tutorials regarding this. But I am quite confused regarding the implementation of integrator in PID control. I could see ...
0
votes
0
answers
34
views
How to determine the K and T values of a modified PID controller?
Circuit
I need to determine the K and T values for the given circuit. I hope I‘ve got the correct equation but I don‘t know how do I have to modify it get the parameters. Can I bring T_R1 & T_R2 ...
- 3
0
votes
3
answers
103
views
How do I get Kp?
How do you get the equation for Kp? I know where R2/R1 comes from, but no idea about + Cd/Ci.
- 3
0
votes
2
answers
145
views
How to integrate dead-zone in the PID controller implemented in the velocity form?
I have the below given implementation of the PID controller.
...
- 1,061
0
votes
1
answer
30
views
What is the influence of the measurement offset in the PI control loop?
Let's say I have a control loop with a direct acting PI controller
Now suppose that there is some positive offset present on the measurment of the controlled variable and at the same time the ...
- 1,061
1
vote
1
answer
51
views
How to connect potentiometer to an Arduino board and a motor using a large power source at the same time [closed]
I want to use a PID system to control a potentiometer with a motor. I'm going to run the system on an Arduino so I need to connect my potentiometer to the Arduino so it can take whatever data it needs ...
- 11
2
votes
0
answers
28
views
What is the integral variable of a PIDF written as a digital biquad in transposed direct form 2?
I have a PIDF written as a digital biquad in transposed direct form 2. Omitting the construction of the a and b constants the guts of the filter look like:
...
- 121
3
votes
0
answers
43
views
PID H-bridge random current spikes
My H-bridge consists of 4 n-channel MOSFETs. The high side is driven by a basic bootstrap circuit, and the low side is directly driven from the MCU.
Using a PID function to control the motor by its ...
- 51
0
votes
0
answers
55
views
Crossover frequency recommendation for double loop control
In some techniques, such as Average current-mode (ACM) control, there are two loops: inner current loop and outer voltage loop. In the Fundamentals of Power Electronics by Robert W. Erickson, there is ...
- 477
9
votes
4
answers
2k
views
PID output at 0 error
I'm having some problems conceptualizing PID, specifically the case where there is 0 error.
The traditional PID formula I usually find is:
\$ output=K_p e + K_i \int e dt + K_d \frac {de}{dt} \$
Let's ...
- 91
1
vote
1
answer
101
views
How to PID control a 47 Ω, 8 W resistor with a Raspberry Pi and Python?
I have a Raspberry Pi 4B, a 12 V power supply, a 12 V air pump controlled by a MOSFET, a DS18B20 for feedback and a 47 Ω, 8 W resistor that we should somehow heat. Everything up to actually heating ...
- 411
0
votes
1
answer
55
views
Constant Current Charger
I have done a simple charger by using a opamp UA741 and a current limiter. The current limit method is using 2 transistors and a resistor to limit at 3A. However, this current limit was not limit the ...
4
votes
2
answers
369
views
Understanding PID controller output value
Consider a PID controller that needs to regulate the temperature of a small object. This will be implemented in software in a microcontroller.
A thermistor is closely bonded to a heater (a small 3 ...
- 434
0
votes
0
answers
30
views
Measuring Motor Speed in an analog circuit - (no digital components)
I have been searching for several resources on closed-loop analog motor control. Most of them used a tachometer for speed measurement, which makes a lot of sense because the tachometer is analog and ...
- 167
0
votes
1
answer
144
views
LQR Infinite Horizon vs. Finite Horizon vs. Receding Horizon?
I don't know if this is the right forum, but I would like to know in words the difference between these 3 forms.
I have searched online and in books but there are often demonstrations packed with ...
- 327
0
votes
0
answers
80
views
SSR or TRIAC for 8kW three-phase kiln
I have a PID-controller that uses VAC as the control signal. The kiln will be heated and cooled in stages with specific speed (t oC per hour), mainly for ceramics with crystal glazes.
Manufacturer ...
- 1
0
votes
1
answer
62
views
Can a sine wave input be equivalent to a direct current signal?
I want to control the temperature of an electric oven. To do this, I must find its mathematical model, or transfer function.
To control the temperature of the oven I use PWM, which goes into a circuit ...
