Ch 8 PV

  1. Direct Current
    Electrical current that flows in one direction, either positive or negative
  2. Alternating Current
    Electrical current that changes between positive and negative directions
  3. Frequency
    The number of waveform cycles in one second
  4. Period
    The time it takes a periodic waveform to complete one full cycle before it repeats
  5. Peake
    The maximum absolute value of a waveform
  6. Peake-to-peake
    A measure of the difference between positive and negative maximum values of a waveform
  7. Root-Mean-Square (RMS) Value
    A statistical parameter representing the ffective value of a waveform
  8. Voltage Unbalance
    The unbalance that occurs when the voltages of a three-phase power supply or the terminals of a three-phase load are not equal
  9. Single Phasing
    The complete loss of one phase on a three-phase power supply
  10. Current Unbalance
    The unbalance that occurs when current is not equal on the three power lines of a three-phase system
  11. Phase Unbalance
    The unbalance that occurs when three-phase power lines are more or less that 120 degrees out of phase
  12. Harmonic
    A waveform component at an integer multiple of the fundamental waveform frequency
  13. Total Harmonic Distortion (THD)
    The ratio of the sum of all harmonic components in a waveform to the fundamental frequency component
  14. Resistive Load
    A load that keeps voltage and current waveforms in phase
  15. True Power
    Is the product of in-phase voltage and current waveforms and produces useful work
  16. Reactive Load
    An AC load with inductive and/or capacitive elements that cause the current and voltage waveforms to become out of phase
  17. Reactive Power
    The product of out-of-phase voltage and current waveforms and results in no net power flow
  18. Power Factor
    The ratio of true power to apparent power and describes the displacement of voltage and current waveforms in AC circuits
  19. Apparent Power
    A combination of true and reactive power and is given in units of volt-amperes (VA)
  20. Inverter
    A device that converts DC power to AC power
  21. Line-Commutated Inverter
    An inverter whose switching devices are triggered by and external source
  22. Self-Commutated Inverter
    An inverter that can internally control the activation and duration of its switching
  23. Rectifier
    A device that converts AC power to DC power
  24. Transformer
    A device that transfers energy from one circuit to another through magnetic coupling
  25. DC-DC converter
    A device that changes DC power from one voltage to another
  26. Maximum Power Point Tracker (MPPT)
    A device or circuit that uses electronics to continually adjust the load on a PV device under changing temperature and irradiance conditions to keep it operating at its maximum power point
  27. Inverter Efficiency
    Is the effectiveness of an inverter at converting DC power to AC power
Card Set
Ch 8 PV
Ch 8 PV