Відео

Hola. Excelente explicación sobre limites de excursión de frecuencia.😊

Solution of the swing equation using the fourth order Runge-Kutta Method According to the book of Stevenson (Electrical Power Systems) The swing equation is: (2H/wn) w’=pm-pe In this case w is the relative speed of the rotor of the generator, that is: w=speed of the rotor minus synchronic speed of the generator If the generator is running at synchronic speed, then w=0 rad/sec I solved for w’ and I got: w’=(wn/2H)(pm-pe) In this case wn is the angular frequency of the electrical network, that is wn=2πfe where fe=50 Hertz in Norway. I substituted wn=2πfe in the swing equation and I got: w’=(2πfe /2H)(pm-pe) w’=(πfe/H)(pm-pe) I changed the variables using δ’=w and δ’’=w’ and I got δ’’= (πfe/H)(pm-pe) The electrical power of the generator is pe=ksin δ where k is: k=Eq’Eth/(xd’+xth) Eq’=internal voltage of the generator xd’=transient reactance of the generator Eth=Voltage of Thevenin seen from the terminals of the generator xth=Reactance of Thevenin seen from the terminals of the generator I assumed that R=0 that is lossless impedance. I substituted pe=ksin δ and I got: δ’’=(πfe/H)(pm-ksinδ) The above equation is a non-linear second order differential equation In order to solve the above equation I formed a system of differential equations: δ’=w w’= (πfe/H)(pm- ksinδ) The system of differential equations can be represented like this: δ’=f(t,δ,w) w’=g(t,δ,w) Since the swing equation is non-linear I used a numerical method to solve it. I used the fourth order Runge-Kutta method. This method is used to find the approximate values of the rotor angle δ and rotor speed w for a given value of t (time). Calculation of the first step The initial conditions are: n=0, t0, δ0, w0 t0=0 δ0=initial angle of the rotor in radians w0=0 rad/sec At the beginning the generator is running at synchronic speed, then w=0 rad/sec k1=f(t0,δ0,w0)=w0 l1= g(t0,δ0,w0)= (πfe/H)(pm- ksinδ0) k2=f(t0+h/2,δ0+k1h/2,w0+l1h/2) k2= w0+l1h/2 l2= g(t0+h/2,δ0+k1h/2,w0+l1h/2) l2= (πfe/H)(pm- ksin(δ0+k1h/2)) k3=f(t0+h/2,δ0+k2h/2,w0+l2h/2) k3= w0+l2h/2 l3= g(t0+h/2,δ0+k2h/2,w0+l2h/2) l3= (πfe/H)(pm- ksin(δ0+k2h/2)) k4=f(t0+h,δ0+k3h,w0+l3h) k4= w0+l3h l4= g(t0+h,δ0+k3h,w0+l3h) l4= (πfe/H)(pm- ksin(δ0+k3h)) t1=t0+h δ1=δ0+(h/6)(k1+2k2+2k3+k4) w1=w0+(h/6)(l1+2l2+2l3+l4) Calculation of the second step The “new” initial conditions are. n=1, t1, δ1, w1 k1=f(t1,δ1,w1)=w1 l1= g(t1,δ1,w1)= (πfe/H)(pm- ksinδ1) k2=f(t1+h/2,δ1+k1h/2,w1+l1h/2) k2= w1+l1h/2 l2= g(t1+h/2,δ1+k1h/2,w1+l1h/2) l2= (πfe/H)(pm- ksin(δ1+k1h/2)) k3=f(t1+h/2,δ1+k2h/2,w1+l2h/2) k3= w1+l2h/2 l3= g(t1+h/2,δ1+k2h/2,w1+l2h/2) l3= (πfe/H)(pm- ksin(δ1+k2h/2)) k4=f(t1+h,δ1+k3h,w1+l3h) k4= w1+l3h l4= g(t1+h,δ1+k3h,w1+l3h) l4= (πfe/H)(pm- ksin(δ1+k3h)) t2=t1+h δ2=δ1+(h/6)(k1+2k2+2k3+k4) w2=w1+(h/6)(l1+2l2+2l3+l4) So the results were t0=0 sec δ0=initial angle of the rotor in radians w0=0 rad/sec t1…….δ1=angle of the rotor[rad] at t1…..w1=relative speed [rad/sec] of the rotor at t1 t2…….δ2=angle of the rotor[rad] at t2…..w2=relative speed [rad/sec] of the rotor at t2 I hope that these formulas have been useful for you. Sincerely Carlos V. Dominguez .Electrical Engineer. Specialist in Electrical Power Systems from Central University of Venezuela.

Muy buena explicación Dr. , aparece el siguiente mensaje: " Se ocultaron 63 videos no disponibles" , habría forma de que se habilite todos los videos porfavor. Gracias por el apoyo.

Very good

It's very very informative video. I want to learn more proficiently because i am working on Virtual power plants. Please I need your help. I will be very thankful to you.

Excelente videos, seria tan amable de activar mas de los videos porque salen que 63 videos estan OCULTOS...muchas gracias su aporte

Thank you sir for this informative video!

Me llego una cmc256-3, pero no tiene conexion Ethernet, tiene cable con usb pero no conecta con la maleta, como uedes ayudarme

Gracias

Thanks a million

you are the best !

I know this is like 3 years old but do you have any notes, a video or a suggestion for documentation that covers the process of reaching the relay remotely over wan?

thanks a looooot!

Thank you very much! Your video was very useful for me! Wish you great succes!

How we can know the frequency mode and which generators oscillate against other generators Thank you in advance and also for the great explaination

Dónde puedo llevar un curso para certificarme?

You are amazing Prof. Wonderful way to explain things. Have you uploaded any more parts on DSL as I am unable to find?

How to get this software

Excelent Video !! Thanks very much!!

Excelente video !!

Muy buen video , por favor donde podria encontrar en venta en USA ( usado y certificado ) sobre este equipo CMC 256plus y CMC 356. Gracias de antemano por su ayuda

How can I see next video?

Thanks...😊

Thank you Sir for your tremendous work. I want to know the ABCD parameter for a particular mode. Please help me finding this.

Amigo teria como mandar o codigo dessa HMI?

Buen video. Bastante explicativo. ¿El "Complete Method" se basa en alguna norma internacional? Saludos desde Chile.

Si por ejemplo en una wind turbine no sale la opcion de diseñar el plant model como hago para hacer el plant model?

Is there a chance to take this model and put it on my own system or i have to create it on my own ?

Mucha gracias profe, muy útil.

💪🤝👏👏👏

Thanks a lot for the information!!!

Dear professor Gonzalez, thank you very much for the informative class not only for students but also for professionals. Just one small feedback. It would be great if you add the link of related videos in the description of each video so it is easy to find them. I look for the part 2 of this video but unfortunately didn’t find it.

Excelente video. Tiene información muy interesante. Felicitaciones

Excelente explicación sobre H (Constante de inercia). Felicitaciones..

Excelente video profesor! Una duda, en PowerFactory se puede ver la constante Hsys? o uno debe sumarlas? Gracias!

Profesor Francisco, realice en un sistema de prueba la implementación del sistema de control en frecuencia, y si responde a las curvas que usted menciona en la presentación, saludos desde Bolivia.

Excelente Video. Felicitaciones.

Hey Francisco great video!, How can I access some of your main documents like slides and notes if possible

Part 2 please

Thanks Prof.

Is this project published somewhere? Or could you share any documentation on this?

Thanks, Professor.

Thank you sir for your videos but sequencing required.

Your videos are good but it will be better if there is any sequence of them.

dear, prof FGL, please provide video about generation adequacy, thank you

In DIgSILENT Dynamic Model Library, there are any libraries: DIgSILENT, Macros, and PSS/E from DIgSILENT template, WECC - westernelectriccity&coordinatingcouncil (include RE modelling), ENTSO-european, IEC,IEEE Asynchronous Machine (ElmAsm) Doubly Fed Induction Machine (ElmAsmsc) File Object (ElmFile) Load General (ElmLod) Noise Generator element (ElmNoise) Rectifier/Inverter 2-DC Connection (ElmRec) Rectifier/Inverter 1-DC Connection (ElmRecmono) Static Var System (ElmSvs) Synchronous Machine (ElmSym) AC Voltage Source (ElmVac) Soft Starter (ElmVar) PWM1-DC Connection (ElmVscmono) There are some basic macro such as First order delay (1 / [s+T] ) which is the parameter inside (T) must be defined, here defined by Tr Type of modelling: Digsilent Dynamic Link Library (DLL) - Built in, MATLAB m-file SIMULINK, DSL model - created by user

DSL => object-oriented system, it's flexible, inheritance, reusable, like type of cable/transformers to use it in some of network. Red = Composite models, frame, model block definition, characteristic, have spesification/parameter = Element Type = Subset in Library, can be reuse Green = Common models = Set in Data Manager = Element Component in Network System, connect with another component to build network Ex: synchronous machine controllers like AVR, GOV, PSS, relay, Virtual inertia, measurement device IED, thermodynamics/electro mechanical behavior equipment

DIgSILENT Dynamic Simulation Language (DSL) - creating, developing, modelling, testing. Modelling Time Domain Simulation (Dynamic state) => for accuracy & validity model system implementation, with fault applied The urgency of user defined model exist => no standardization models that contain standardization parameters DSL = add on of Transient analysis Stability analysis = predefined system models

- tap changer = modify transformers ratio, change the voltage. Background: load increase, more voltage drop, use tap changer at load current is low. type: OLTC, NLTC - set the shunt capacitor & tap changer automatically - print the plot & SLDin the "professional way" wkwk - transformer shifting = modify phase angle vector at transformer - in the real world, shunt capacitor didn't install at nominal voltage of the busbar, why? when we use another characteristic of compensator (R-L-C, R-L-C1-C2Rp, R-L)?