For learning and using Machine leaning is it necessary to have a computer science background?

While designing controllers for DC-AC converters, I am having difficulties in understanding the control loops for deriving a reference signal for PWM. How these loops are used with PI controllers to get desired reference signal. What is the fundamental idea behind this. Please suggest some good books and papers.

TCR consists of a linear reactor in series with anti-parallel thyristors. Firing angle in a TCR typically varies from 90 degree to 180 degree. We know that current lags the voltage by 90 degrees in a reactor. Is this the reason behind specified firing angle range or there is something else?

What happens if the TCR is fired at an angle below 90 degree?

Power system strength is very important for system planning and protection design. There is one metric "SCR or short circuit ratio" generally mentioned to define the system strength. I have confusion about the definition of this index. Some texts define it as the ratio between short-circuit MVA and rated MVA and some define it in reference to the inverter based resources as the ratio between short-circuit MVA and rated MW of inverter based power source. Few references are attached.

Kindly clarify.

When it comes to frequency in a power system, it is directly linked with the speed of the synchronous generator and mismatch in the mechanical input power and electrical output power accelerates or deaccelerates synchronous generator and thus frequency of the output varies, but how and why does this frequency change happen in a static inverter with load change?

Hi everybody,

currently, I am working on the grid-connected inverter. I want to make my grid-connected PV system a PLL-less system. I have studied some reachers are implementing a virtual synchronous machine to make the system PLL-less. I have tried to implement in MATLAB SIMULINK but the grid current is distorted. Can anybody tell why this happens?

I am looking for a block in MATLAB that can simulate a varying load such as a load of a house given below. this block will be connected to a power system

In a single phase transformer design, we know that-

Flux Density, B=1/(4.44*f*A*Te),

where f is the frequency, A is the cross-sectional area of the core, Te is the turn/volt value.

Hence, If we increase the voltage, flux density will also increase.

Here, there is no mention of the current drawn from the transformer secondary.

Also, we know that MMF(magnetomotive force) = N*I= ampere turns = Rm* Φ ,

where Rm is the reluctance of the core(a constant) and Φ is the flux( Φ =BA)

hence, we may conclude that Flux (also flux density, B) is directly proportional to I(current ) considering that turns, voltage , reluctance, Area of the core cross-section etc. are all constants for a given design.

Now the conflict arises that,

If the flux density, B depends on voltage across N no. of turns(as in case 1, how can it depend on the current drawn from N no. of turns?

What is the approach for doing the state space analysis of a three-phase VSI having LC filters coupled with each of its legs?

I want the state space analysis for each and every operating mode.

Should I consider the one-legged operation or should I take into account all the six states?

By changing the reactive power in the transmission line, voltage profile also changes.

My question is, how reactive power injection into grid changes the grid voltage? and is there any relation between the grid short circuit level and reactive power injection?