I have successfully modeled both components, but I am facing a significant issue. When I replace the three-phase voltage source with the alternator, the input voltage to the three-phase rectifier becomes nearly zero, despite the alternator producing a stable three-phase voltage.
Here are the details of my setup:
Rectifier Configuration:
Using a Universal Bridge block in Simulink and a Converter (Three-Phase) block in Simscape.
Parameters for Universal Bridge:
Number of bridge arms: 3
Snubber resistance Rs: 1e5 Ohms
Snubber capacitance Cs: inf
Power electronic device: IGBT / Diodes
Ron: 1e-3 Ohms
Forward voltages [Device Vf(V), Diode Vfd(V)]: [0 0]
Parameters for Converter (Three-Phase):
Forward voltage, Vf: 0.00000001 V
On-state resistance: 0.001 Ohm
Off-state conductance: 1e-6 1/Ohm
Threshold voltage, Vth: 0.1 V
Integral protection diode: Diode with no dynamics
Forward voltage: 0.00000001 V
On resistance: 0.001 Ohm
Off conductance: 1e-5 1/Ohm
Snubber: RC snubber
Snubber capacitance: 1e-7 F
Snubber resistance: 1e5 Ohms
Alternator Parameters:
Three-phase synchronous machine with a round rotor.
Proper initialization and verified output: stable three-phase voltage and current.
Simulation Settings:
Solver: ode23t
Proper machine initialization.
Problem Description:
The output of the alternator is a good three-phase voltage and current when checked independently.
When the alternator is connected to the rectifier, the input voltage to the rectifier is distorted and significantly diminished.
No connection issues were found, and the simulation settings were adjusted, including changing the solver to ode23t, but the problem persists.
Questions:
What could be causing the input voltage to the rectifier to be nearly zero when using the three-phase synchronous machine as the source?
Are there specific snubber values or configurations that could resolve this issue?
Could there be any interaction or parameter mismatch between the alternator and the rectifier that I need to address?
What are the best practices for setting snubber parameters in such a setup?
Any insights or suggestions to resolve this issue would be greatly appreciated. Thank you for your help!I have successfully modeled both components, but I am facing a significant issue. When I replace the three-phase voltage source with the alternator, the input voltage to the three-phase rectifier becomes nearly zero, despite the alternator producing a stable three-phase voltage.
Here are the details of my setup:
Rectifier Configuration:
Using a Universal Bridge block in Simulink and a Converter (Three-Phase) block in Simscape.
Parameters for Universal Bridge:
Number of bridge arms: 3
Snubber resistance Rs: 1e5 Ohms
Snubber capacitance Cs: inf
Power electronic device: IGBT / Diodes
Ron: 1e-3 Ohms
Forward voltages [Device Vf(V), Diode Vfd(V)]: [0 0]
Parameters for Converter (Three-Phase):
Forward voltage, Vf: 0.00000001 V
On-state resistance: 0.001 Ohm
Off-state conductance: 1e-6 1/Ohm
Threshold voltage, Vth: 0.1 V
Integral protection diode: Diode with no dynamics
Forward voltage: 0.00000001 V
On resistance: 0.001 Ohm
Off conductance: 1e-5 1/Ohm
Snubber: RC snubber
Snubber capacitance: 1e-7 F
Snubber resistance: 1e5 Ohms
Alternator Parameters:
Three-phase synchronous machine with a round rotor.
Proper initialization and verified output: stable three-phase voltage and current.
Simulation Settings:
Solver: ode23t
Proper machine initialization.
Problem Description:
The output of the alternator is a good three-phase voltage and current when checked independently.
When the alternator is connected to the rectifier, the input voltage to the rectifier is distorted and significantly diminished.
No connection issues were found, and the simulation settings were adjusted, including changing the solver to ode23t, but the problem persists.
Questions:
What could be causing the input voltage to the rectifier to be nearly zero when using the three-phase synchronous machine as the source?
Are there specific snubber values or configurations that could resolve this issue?
Could there be any interaction or parameter mismatch between the alternator and the rectifier that I need to address?
What are the best practices for setting snubber parameters in such a setup?
Any insights or suggestions to resolve this issue would be greatly appreciated. Thank you for your help! I have successfully modeled both components, but I am facing a significant issue. When I replace the three-phase voltage source with the alternator, the input voltage to the three-phase rectifier becomes nearly zero, despite the alternator producing a stable three-phase voltage.
Here are the details of my setup:
Rectifier Configuration:
Using a Universal Bridge block in Simulink and a Converter (Three-Phase) block in Simscape.
Parameters for Universal Bridge:
Number of bridge arms: 3
Snubber resistance Rs: 1e5 Ohms
Snubber capacitance Cs: inf
Power electronic device: IGBT / Diodes
Ron: 1e-3 Ohms
Forward voltages [Device Vf(V), Diode Vfd(V)]: [0 0]
Parameters for Converter (Three-Phase):
Forward voltage, Vf: 0.00000001 V
On-state resistance: 0.001 Ohm
Off-state conductance: 1e-6 1/Ohm
Threshold voltage, Vth: 0.1 V
Integral protection diode: Diode with no dynamics
Forward voltage: 0.00000001 V
On resistance: 0.001 Ohm
Off conductance: 1e-5 1/Ohm
Snubber: RC snubber
Snubber capacitance: 1e-7 F
Snubber resistance: 1e5 Ohms
Alternator Parameters:
Three-phase synchronous machine with a round rotor.
Proper initialization and verified output: stable three-phase voltage and current.
Simulation Settings:
Solver: ode23t
Proper machine initialization.
Problem Description:
The output of the alternator is a good three-phase voltage and current when checked independently.
When the alternator is connected to the rectifier, the input voltage to the rectifier is distorted and significantly diminished.
No connection issues were found, and the simulation settings were adjusted, including changing the solver to ode23t, but the problem persists.
Questions:
What could be causing the input voltage to the rectifier to be nearly zero when using the three-phase synchronous machine as the source?
Are there specific snubber values or configurations that could resolve this issue?
Could there be any interaction or parameter mismatch between the alternator and the rectifier that I need to address?
What are the best practices for setting snubber parameters in such a setup?
Any insights or suggestions to resolve this issue would be greatly appreciated. Thank you for your help! i want to solve the problem please MATLAB Answers — New Questions

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