Podcast
Questions and Answers
What is the formula for instantaneous power?
What is the formula for instantaneous power?
- $p(t) = \frac{1}{2} V_m I_m \cos(\theta_v - \theta_i) + \frac{1}{2} V_m I_m \cos(2\omega t + \theta_v + \theta_i)$ (correct)
- $p(t) = P + Q(t)$
- $S = V I cos\theta + jV I sin\theta$
- $p(t) = [\cos(\theta_{vi}) - \cos(2\omega t - \theta_{vi})]^2$
What does the complex power S represent?
What does the complex power S represent?
- Reactive power, Q, that supports the system electromagnetically
- Single system frequency, f
- Voltage profile, V
- Real power, P, able to perform useful work (correct)
In normal system operation, which dynamics are decoupled from voltage/reactive-power?
In normal system operation, which dynamics are decoupled from voltage/reactive-power?
- Real power and reactive power dynamics
- Real power and frequency dynamics (correct)
- Instantaneous power and frequency dynamics
- Voltage and frequency dynamics
What is the formula for real power?
What is the formula for real power?
What is the average of the expression for instantaneous power?
What is the average of the expression for instantaneous power?
What does the formula $p(t) = V_{max}I_{max} [cos(\theta_{vi}) - cos(2\omega t - \theta_{vi})]$ represent?
What does the formula $p(t) = V_{max}I_{max} [cos(\theta_{vi}) - cos(2\omega t - \theta_{vi})]$ represent?
What is the formula for average power from the given expression for instantaneous power?
What is the formula for average power from the given expression for instantaneous power?
What is the complex power denoted by the symbol S in the context of power systems?
What is the complex power denoted by the symbol S in the context of power systems?
What is the angle represented by $\theta$ in the equation $S = V I cos\theta + jV I sin\theta$?
What is the angle represented by $\theta$ in the equation $S = V I cos\theta + jV I sin\theta$?
What do real power, P, and reactive power, Q, represent in a power system?
What do real power, P, and reactive power, Q, represent in a power system?
Which formula represents the instantaneous power in the time domain?
Which formula represents the instantaneous power in the time domain?
What does the complex power S represent in the context of power systems?
What does the complex power S represent in the context of power systems?
Which angle is represented by $\theta$ in the equation $S = V I cos\theta + jV I sin\theta$?
Which angle is represented by $\theta$ in the equation $S = V I cos\theta + jV I sin\theta$?
What is the formula for the average of the expression for instantaneous power?
What is the formula for the average of the expression for instantaneous power?
In a normal system operation, which dynamics are decoupled from voltage/reactive-power?
In a normal system operation, which dynamics are decoupled from voltage/reactive-power?
