Ch 8 PV
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Direct Current
Electrical current that flows in one direction, either positive or negative

Alternating Current
Electrical current that changes between positive and negative directions

Frequency
The number of waveform cycles in one second

Period
The time it takes a periodic waveform to complete one full cycle before it repeats

Peake
The maximum absolute value of a waveform

Peaketopeake
A measure of the difference between positive and negative maximum values of a waveform

RootMeanSquare (RMS) Value
A statistical parameter representing the ffective value of a waveform

Voltage Unbalance
The unbalance that occurs when the voltages of a threephase power supply or the terminals of a threephase load are not equal

Single Phasing
The complete loss of one phase on a threephase power supply

Current Unbalance
The unbalance that occurs when current is not equal on the three power lines of a threephase system

Phase Unbalance
The unbalance that occurs when threephase power lines are more or less that 120 degrees out of phase

Harmonic
A waveform component at an integer multiple of the fundamental waveform frequency

Total Harmonic Distortion (THD)
The ratio of the sum of all harmonic components in a waveform to the fundamental frequency component

Resistive Load
A load that keeps voltage and current waveforms in phase

True Power
Is the product of inphase voltage and current waveforms and produces useful work

Reactive Load
An AC load with inductive and/or capacitive elements that cause the current and voltage waveforms to become out of phase

Reactive Power
The product of outofphase voltage and current waveforms and results in no net power flow

Power Factor
The ratio of true power to apparent power and describes the displacement of voltage and current waveforms in AC circuits

Apparent Power
A combination of true and reactive power and is given in units of voltamperes (VA)

Inverter
A device that converts DC power to AC power

LineCommutated Inverter
An inverter whose switching devices are triggered by and external source

SelfCommutated Inverter
An inverter that can internally control the activation and duration of its switching

Rectifier
A device that converts AC power to DC power

Transformer
A device that transfers energy from one circuit to another through magnetic coupling

DCDC converter
A device that changes DC power from one voltage to another

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

Inverter Efficiency
Is the effectiveness of an inverter at converting DC power to AC power