Hi All,
I would like to use a ZigBee network for a home automation.
I read all the literature on the web.
But there is some silly questions that puzzle me.
For instance, if I need to install a lighting system, e.g. 3 light switches..
1/ Do I need 3 ZigBee enddevices + 1 Zigbee Coordinator or...
The problem was from the design of PI with Simulink blocks.
But I still don't understand why this design works with the first set-up and not with the second set-up, which is mine.
In fact,using PI as a transfer function has resolved the problem, in my global system.
Skogsgurra,
Ok, let's say that I was able to tune the controller using SISOtool, which enables to find pole and zero of the controller.
In PI case:
Kp (1+ Ki/s) = K( s + Ki) / s with Ki=1/Ti
Ki is the zero of the plant.
So I was to find Ki and Kp via SISOtool.That's all.
Hi All,
Yes, it is Skogsgurra.
Ive resolved my problem yersteday...
The source of problem was the used design of PI controller.
I didn't use a normal controller, the design was slight different.
Once tuned the PI using SISOTOOL(Simulink GUI), Ive taken the transfer function of PI from that...
Hello skogsgurra,
About Rd in not working system,it is high.
Actually, this damping resistor is calculated theoritically by taking into account resonance frequency and capacitor:
Rd= 1/3 * 1/ (OMEGA_res.C)
But it is true that in real, it should be very small about mOhm. But I...
Some details:
1/ LCL = LC filter + L (transformer)
Rd = damping resistor in serial with C
L are not ideals.
Ri is the intern resistance of Li, inverter side inductance
Rg is the intern resistance of Lg, inverter side inductance
Li = 0.45mH
Lg = 0.5mH
C = 9.4uF
Rd=1.6 Ohm...
LCL: It is two reactors and a capacitor in-between.
Basically the LCL filter is connected to the grid, the aim is to control the current.
the problem is independant of Id or Iq, the problem is the for a plant (LCL) controlled by a PI, there is some overshoot when parameters change i.e. when...
Hi all,
I am struggling with PI controller to control a curretn controller.The control is in discrete time.
Basically, i have a set-up with an inverter and LCL filter.
The idea is to control, using dSPACE, the current in d and q axis measured in the output of the LCL filter.
What I'm...
Hi All,
The cause of the overcuurent was the wrong connection of the LC filter in inverter output (in CL filter)!!! Electrician's problem!
I wonder now why I don't have ant sinusoidal voltages at the filter output. It'd be normally sinusoidal, should it?
I wonder whether it's insignifiant to...
Actually I'm not using the original card of the VLT, I'm using and other one:
http://ftp-dee.poliba.it:8000/Liserre/23-24%20Lezione%2007%2006%202004/IPC5manual.pdf
Ive done some other measurements, the conclusion is :
If a put in PWMa = alpha;
PWMb and PWMc must be alpha+0.03 or...
Interesting remark:
When I send PWM signals to the 3 legs, there's no overcurrent!
But sending PWM to one leg or two legs occur the overcurrent.
If anyone can explain that...
hi sed2developer,
Actaully I'm not using the VLT5000 for a motor control, but for a power control.
Initially I'm trying with the dump load(active power consumer).
But my problem is only a hardware problem, since there is any complex control.
When I send a PWM signal to one leg of the inverter...
Hi Dick, I knew my explanation was not clear...
Actually "the power feedback device" is a REVCON Unit(german brand).I feed the DC bus via the rectifier from the Danfoss.
The only function of the Revcon unit is to maintain the voltage stable.The measurement done indicates 550V.
I measure via...
Hi, I'm using a dSPACE 1104 to control a Danfoss drive VLT5000.
The DC bus of the inverter(Danfoss) is fed by a power feed back unit to maintain stable the DC voltage.
I put a dump load in AC side(Danfoss inverter side).
And when I tried sending a PWM signal in one leg, I can see a overcurrent...
