Assistance Needed – Negative Input Power in Simulink Model

조회 수: 40 (최근 30일)
Fsquared
Fsquared 2025년 9월 22일 22:54
답변: TARUN 2025년 9월 26일 9:45
Hello everyone,
I am currently simulating a model of an induction motor in Simulink, but I am encountering an issue where the input power is showing negative values. I have attached the model for your reference.
Could you please help me understand what might be causing this behavior and suggest possible solutions to resolve it?
Thank you for your assistance.
  댓글 수: 3
Walter Roberson
Walter Roberson 2025년 9월 23일 3:40
Which scope output should we be focusing on, as evidence of the input power showing negative values?
Fsquared
Fsquared 2025년 9월 23일 13:11
the display block named pin

댓글을 달려면 로그인하십시오.

답변 (2개)

Sabin
Sabin 2025년 9월 25일 13:18
The instantaneous power measurement assumes that both voltages and currents are referenced to the same point. However, in the attached model the computation is done using phase currents and line voltages. Therefore, the incorrect calculation.

TARUN
TARUN 2025년 9월 26일 9:45
The negative input power is due to a mismatch in your measurement signals. The instantaneous power block expects phase-to-neutral voltages with phase currents, but in your model, you’ve connected line-to-line voltages with phase currents, which leads to incorrect results.
To fix this, you can:
• Use phase-to-neutral voltages (Va, Vb, Vc) instead of line voltages.
• If only line voltages are available, convert them to phase voltages before feeding them into the power calculation.
This should give you the correct positive power that matches your motor’s shaft power (torque × speed).

카테고리

Help CenterFile Exchange에서 Motor Drives에 대해 자세히 알아보기

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by