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xin


Last seen: 2 months ago |  Active since 2024

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I am trying to implement a state space solution in Simulink with 1 variable m in matrix C, but the runtime error says Variable ‘m’ does not exist.
I am trying to implement a state space solution in Simulink with 1 variable m in matrix C, but the runtime error says Variable ‘...

2 months ago | 1 answer | 0

1

answer

Question


How to fill the space between two surfaces？
If f1(x,y)≤z≤f2(x,y), how to draw the range of z? If the upper and lower limits of z are described by separate functions, how to...

2 months ago | 1 answer | 0

1

answer

Question


If f1(x,y)≤z≤f2(x,y), how to draw the range of z?
x=-5:0.1:5; y=-5:0.1:5; for m=1:101 for n=1:101 z1(m,n)=x(m)^2+y(n)^2; z2(m,n)=3*x(m)^3+y(n)^2+1; end end surf(x...

2 months ago | 3 answers | 0

3

answers

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How to solve for the maximum or minimum value of a symbolic function
I have a complex symbolic function and want to find the corresponding maximum or minimum value. So I make its derivative equal t...

3 months ago | 3 answers | 0

3

answers

Question


Why are the results of the iterative calculations different？
Consider the solution for capacitive current，,running different codes gives different results. %%%%%%%%%%%%%%% clear clc T=1...

3 months ago | 1 answer | 0

1

answer

Question


How to solve optimization problems with constraints of differential equations constraints ?
I want to use the fmincon function but I don't know how to write constraints with differential equations.

3 months ago | 1 answer | 0

1

answer

Question


Using z-transform to solve the capacitor current, but I don't know where I went wrong.
Take the simplest capacitive current as an example,, is capacitance. The corresponding transfer function is Applying bilinear...

3 months ago | 1 answer | 0

1

answer

Question


How to extract 50Hz fundamental frequency components or DC components with less delay in Simulink?
I want to extract the 50Hz fundamental frequency component or DC component of the voltage at the shunt point in a double closed ...

3 months ago | 1 answer | 0

1

answer

Question


Why are there asymmetrical three-phase currents in a three-phase symmetrical circuit?
Inserting zero reference voltage into the system using LC-VSC three phase inverter, both source and load voltages are unbalanced...

4 months ago | 1 answer | 0

1

answer

Question


Why is there a 50Hz component in the load current dq transformation?
In my modelling for UPFC I found that the dq component of the load current has a 50Hz component, but how can I explain this phen...

4 months ago | 1 answer | 0

1

answer

Question


How to correctly calculate three-phase voltage at the PCC parallel point when placing a STATCOM?
I simulated STATCOM model and found that the calculated voltage at PCC point is not correct with the discrete solver used, how t...

4 months ago | 1 answer | 0

1

answer

Question


How to correctly calculate three-phase voltage at the PCC parallel point ?
I simulated STATCOM model and found that the calculated voltage at PCC point is not correct with the discrete solver used, how t...

4 months ago | 1 answer | 0

1

answer

Question


I'm having trouble solving a system of nonlinear equations with the fmincon function.
I want to solve a system of equations containing two non-linear equations, one of which is Psh_newhv == Pse_newhv,the other is Q...

4 months ago | 1 answer | 0

1

answer

Question


Solver stopped prematurely. fsolve stopped because it exceeded the function evaluation limit, options.MaxFunctionEvaluations = 2.000000e+02.
I want to solve a system of equations containing two non-linear equations, one of which is Psh==Pse,the other is Qs==0, but solv...

4 months ago | 1 answer | 0

1

answer

Question


Colour interference when two surfaces overlap
Colour interference when two surfaces overlap, how to solve it？

5 months ago | 1 answer | 0

1

answer

Question


Inverter DC Capacitor Voltage Control
Using PI to control the DC capacitor voltage of the inverter, but there are pulses from 0.4 seconds. I don't know what the cause...

5 months ago | 1 answer | 0

1

answer

Question


PLL phase-locked frequency failure
I used the RTU box 204 to build the PLL phase-locked loop, in order to eliminate the algebraic loop, in the phase wt and dq tran...

6 months ago | 1 answer | 0

1

answer

Question


How to measure the power of the VSC port
I want to simulate the dynamic voltage restorer simulation, but the strange thing is that when the load voltage is normal, the o...

7 months ago | 1 answer | 0

1

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