A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a ...

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23 views

Distribution of Control in Modern Electrical Grid SCADA Systems [on hold]

I have a few questions regarding the structure of modern SCADA systems, in the context of the electrical grid. Specifically, what controls the state (either open or closed) of circuit breakers on ...
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0answers
33 views

Estimating Frequency in PLL from phase

Assume I have a digital PLL that outputs phase estimate of the reference signal, however I am wondering can I estimate the frequency of reference signal according to the given phase estimate? I know ...
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1answer
36 views

Is a Variable Frequency Drive (VFD) a Secondary Element or Final Control Element (FCE) in a control system? [closed]

I'm confused with some concepts about instrumentation in a control system. I'll use a Variable Frequency Drive (VFD; PowerFlex 70) to control a pump to change the process fluid level. It's clear in ...
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0answers
41 views

How to learn Control systems? [closed]

I have been astonished by Control theory and, its applications like the inverted pendulum, and the various control projects that use gyroscopic effect for stabilization, and i am avidly trying to ...
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1answer
46 views

How to test PLL for step input change in phase

I wrote a simulation for second order PLL and I would like to test it with a input to see whether my PLL can track the phase. I would like to change phase of my sinusoidal signal with step with ...
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1answer
25 views

Phase lock loop frequency of reference signal

I am writing a Matlab code for phase locked loop and up to now I assumed that frequency of input signal is given (known) and I choose frequency of my VCO close or exactly the same as reference signal. ...
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1answer
47 views

Park/Clarke Transform and Power

I'm looking to determine the electrical power input to a 3-phase BLDC motor, driven by TI's DRV8305 motor controller. I can't use the DC power flowing into the system because I'm trying to capture the ...
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1answer
40 views

Control Engineering - Root Locus

Please see attached Question & Answer screenshot. I have managed to answer up to part 4 of the questions however in part 5, after countless working out and re-evaluating my approach, I still can't ...
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0answers
7 views

VSC-based multi-terminal HVDC Control

I came across multi-terminal HVDC based VSC Simulation in MATLAB/Simulink. The control (using vector control ) for such a system is very tough for me because I have little experience in this field (...
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1answer
20 views

How do I go about identifying a thermal system with multiple inputs and outputs? MIMO system

I have a lot of measurements of a thermal system that I would like to model using a state space model. How do I go about identifying and modeling the system? The system has 2 inputs and 5 outputs. ...
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1answer
120 views

Output type of incremental rotary encoder

I have been trying to choose incremental rotary encoder for speed control of three phase induction motor. My problem is that I am not sure what type of output should I choose. There is following ...
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2answers
43 views

Phase Margin and Damping Ratio Approximation

I have read in many texts that the closed loop system damping factor can be approximated as: Phase Margin = 100 times Damping Factor. The actual relation between the two is more complicated and i ...
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2answers
109 views

Types and regulation schemes LDOs

LDOs, or low-dropout linear regulators, come in various types, but it can be difficult to distinguish them, and to the novice engineer, this regulator is often made to seem deceptively simple. Some ...
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1answer
34 views

Select sampling frequency to closed loop control in a DC-DC converter

For a DC-DC converter in current mode control the control variable is the inductor's current, which at steady state is periodic. which is the ratio between the switching frequency and the sampling ...
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1answer
40 views

Why non repeated poles at imaginary axis makes LTI system marginally stable?

I understand that stability for an LTI system is defined with respect to Bounded input bounded output condition. However I'm not clear on why non repeated poles on the imaginary axis makes the system ...
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4answers
67 views

Why is impulse response of LTI system important

Why is the impulse response for a LTI system also called its system response? What is special about the output when the input is impulse signal? I understand that impulse signal contains all the ...
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1answer
43 views

Efficient low current buck controller topology

In SMPS there are two sources of loss: parasitics, and the controller. Usually, the load consumes more power than the controller, and the parasitic losses dominate. I have the opposite situation. I ...
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3answers
56 views

PID Control: Controller of the type \$\dfrac{1}{s+k}\$

In PID control an integrator action is represented by \$\dfrac{1}{s}\$ Does anyone know what would be the effect of using \$\dfrac{1}{s+k}\$ instead of \$\dfrac{1}{s}\$, where \$k\$ is a constant? ...
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1answer
37 views

Getting the Wrong Transfer Function for Controls Problem

Background So admittedly, it's been about 5 years since I've dealt with any kind of circuits and now I am going back and taking a controls course. On the very first problem I am doing, my answer is ...
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0answers
35 views

How to determine the transfer function for 2nd order, over-damped system

My question is related to this one asked previously. The chosen answer says to find the poles "a" & "b" for a 2nd order, overdamped system one would first set the derivative of the impulse ...
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1answer
71 views

Discretization Using ZOH, FOH and Tustis bilinear Transformation

I am very new to this forum, so excuse me if i do not write the equations properly. And I'm pretty new to DSP too, so this might be very basics for most of you, but it's pretty complicated to me. I ...
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4answers
33 views

Choosing accelerometer or displacement sensor for system

I am working on an electro-servo motor system which can be seen as a similar in here! It is a shaketable system which converts acceleration input to displacement output. My question involves a bit ...
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0answers
41 views

A quick question about system identification

I am trying to identify a temperature controller system. I have chosen my inputs to be a PRBS signal for the actuator and I am reading in the output from my thermistor. I am using atmega328 to read in ...
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3answers
78 views

interchangeable operation of two electric motors without PLC

I have two motors that drive an air compressor. I have a pressure switch to turn the motors on/off. The sequence I want is: when pressure switch turns ON - motor 1 starts, when pressure switch ...
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1answer
44 views

if i have a pole in (0,0i), is the system stable for k=0?

KGH(s)=k/s(s^2+4s+7) Is my system stable for k=0 ? If i have a pole in 0,0i does it automatic says that my system is not stable
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1answer
55 views

What is the natural frequency of a 3rd order system with 3 real roots?

I know the the structure of a 3rd order system is: \$Q_s=(s+a)(s^2+2\xi\omega ns+\omega n^2)\$ but what do I do if I have something like this? \$Q_s=(s+4)(s+5)(s+3)\$ How do I measure its natural ...
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2answers
58 views

How to get maximum damping factor from this system?

I have a system with a transfer function as $$ \frac{(s+3)(s+10)}{s(s^2+4s+5)(s+10)+K_Ts(s+10)(s+3)+600(s+3)} $$ Which has the characteristic equation: $$ 1+K_T\frac{s(s+3)(s+10)}{s(s^2+4s+5)(s+10)+...
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1answer
44 views

What would be the Transfer Function of this Block Diagram?

I have a block diagram that I am trying to get the transfer function for but can't seem to figure it out, I am sure that I am making it more difficult than it needs to be but still can't get it. The ...
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2answers
49 views

Drawing Bode Plot from transfer function

I have the following question I need to Draw the Bode Plot,so i need to find Magnitude and Phase Angles for a Frquency.I understand that i need to susbstitude ...
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1answer
33 views

Steady State Error of Control System

I have a question regarding a control loop system which is subject to disturbance, unfortunately I missed a couple of lectures on the subject and now am scratching my head as to how to do it. The loop ...
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2answers
34 views

How to infer equivalent PID controller coefficients from an existing black box ccontroller?

I have a 2 input, 2 output system that I have recorded in response to 1. steps (actually quasi-steps, with 50 ms rise time + some overshoot), and 2. sine waves from 0.5 to 50 Hz, in both open and ...
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1answer
27 views

How do i go about finding the transfer function for this control system?

How do i go about finding the transfer function for this control system?
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42 views

conversion of kp,ki values

I have tuned a pi controller with kp, ki values in integer form using matlab simulink tool.To implement the pi on dsPIC33f it a requires fractional pi controller.How to convert conventional pi values (...
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2answers
40 views

help with multivariable control loop

I am looking to find the transfer function from w to z in this loop. I have been trying for a while looking all the relationships but just don't know how to express w in terms of r,d and n and then ...
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0answers
35 views

Designing a system to move a marble on a rotating beam from point A to point B using a servo

I need to figure out how to design a system to move a marble on rest at point A to point B at rest. See my drawing below for what I'm trying to accomplish: I have an Arduino I could use as a ...
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1answer
41 views

Is it possible to set initial state to a simulink model to do simulations?

Consider that I have built an electrical circuit, or a power system or any other at Simulink and to do simulations, Simulink should work in the sense that it builds a state space model of the system, ...
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0answers
40 views

Discrete disturbance observer

I am an autodidact in digital control and I have been solving following problem. I would like to construct a digital state observer combined with disturbance observer and I am not able to find ...
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1answer
44 views

How to implement a MIMO model with state space block in sumulink?

I want to implement an state space model with 4 inputs and 4 outputs at simulink. But the state space block has only one input and only one output. So what can I do here?
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1answer
36 views

k transfer function

If I'm giving a transfer function $$T(s) = \frac{G(s)}{1+G(s)H(s)}$$ When calculating the critical gain using the routh hurwitz method and calculating a negative value for k. What does that tell ...
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2answers
56 views

Root Loci Breakaway points

my question is regarding if the breakaway points exist or not. Do they only exist if 2 poles or 2 zeros are next to each other? Example if their are poles at -1 and -2 the breakaway point would be at -...
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1answer
52 views

Control Systems Stability

So I asked this question previously in the control theory section and got no responses. Ill try it here. Basically I need to find the ranges of k and \$\beta\$ such that the steady state error will be ...
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2answers
90 views

Switching on and off a LED light if a AC is passing through a wire or not

This is the basic setup of what I'm going to do. Have a wire plugged into the mains that is then connected to a ON/OFF flip switch then goes on to the rest of my project. Want I want to do is to add ...
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0answers
77 views

How to make a sound-controlled variable resistance?

So I have those old analog video equipements (Panasonic WJ-AVE5, Videonics Video Equalizer) and I'd like to have some of the parameters (video crossfade, superimpose function, brightness level, etc.) ...
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1answer
43 views

Heat exchanger identification

I have been developing a digital controller for water cooling system of power electronics converter. This system consists of plate heat exchanger, pipe with demineralized water flow (this fluid is ...
1
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1answer
35 views

Closed Loop 4 Sensor Control System

I have 4 on/off motors running individually (call them M1, M2, M3, M4) and 4 ping sensors (call them X1, X2, X3, X4) with a board placed in front of the motors and sensors. As the motors move forward ...
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1answer
45 views

proportional control offset

I understand that with proportional only control you have to have error or the control output goes to zero. The answer to this question Proportional controller was very informative. Mr. Lathrop ...
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2answers
64 views

How an equation in s domain is converted into z domian using zero hold method

I am just reading a research paper on matrix converter and i came through transfer function conversion from s domain into z domain. which i am unable to understand. how the equation 3.4 is transferred ...
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2answers
72 views

Is feedforward used in boost converter operating in DCM mode?

Is feedforward used in boost converter operating in DCM mode? I saw some examples where feedforward is used to control boost converter in CCM but not DCM mode. So I am wondering if it can be used in ...
3
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5answers
686 views

Could you explain how feedforward is used in walking?

I am reading about feedforward in control system. And in this lecture, slide 49, the author says that feedforward is common in human systems. Example, walking, playing basketball, driving a car. ...
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1answer
23 views

Qualitatively assessing time domain characteristics from bode plot

Given a bode diagram of loop transmission function, I have heard that it's possible to qualitatively assess the behavior of the system in time domain. These characteristics include delay time, ...