# Ch 8 PV

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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
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
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
 Author: cgore ID: 163070 Card Set: Ch 8 PV Updated: 2012-07-19 07:07:00 Tags: PV Folders: Description: Ch 8 PV Show Answers: