Pv Flashcards
Unit of electromagnetic radiation
Photon
N-type
Free electron
P-type
Electron void
Semi conductor
Insulating and conducting properties
Doping
The process of adding small amounts of impurity elements to semi conductors to alter their electrical properties
Traction battery
Designed for repeated deep discharge cycle service
Lead acid battery
Most common and cheapest
Primary battery
Cannot be recharged
Charging steady-state
No electrical or chemical changes are occurring
State of charge (SOC)
Percent of energy remaining in a battery compared to fully charged capacity
Float
Battery charging at low charge rate that maintains full battery charge by counteracting self discharge
What are battery charge controllers affected by
Temperature, voltage and irradiance
Types of charge controllers
Series, shunt and MPPT
waveforms
Shape of electrical current that varies overtime measured with frequency
STC standard test condition
W/m squared
1000 w/m squared
Bypass diode
Diode used to pass current around rather than through a group of PV cells
Blocking diode
Used to prevent reversed current flow
Module
Number of individual cells connected electrically packed in a frame
Battery
A collection of cells that are contained in the same case and connected together electrically to produce a desired voltage
Divisionairy charge controller
The charge controller that regulates charging current to a battery system by diverting access power to an auxiliary load
Shunt
The charge controller that limits charging current to a battery system by short-circuiting the array
Pulse width modulation (PWM)
A method of simulating waveforms by switching a series device on and off at high frequency and for variable lengths of time
Maximum power point Tracking charge controller (MPPT)
The charge controller that operates the Array at its maximum power point under a range of operating conditions as well as regulates battery charging
Power quality
The measure of how closely the power on an electrical circuit matches the nominal values of parameters such as voltage current harmonics and power factor
Transient voltage
Undesirable voltage spike
Transformer
A device that transfers energy from one circuit to another through magnetic coupling
Ampacity
The current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating
Standalone PV system
What type of PV system that operates autonomously and supplies power to electrical loads independently of utility
Hybrid PV system
System that includes an energy source other than an array and utility
Bi- model
Can operate in either utility interactive or standalone mode and uses battery storage
Three parties for PV install
NFPA, UL,IEEE
Distribution
Centralized, synchronized and distributed
Dual metering
Metering arrangement that measures energy exported to an imported from utility grid separately
Net metering
Metering arrangement where any excess energy is exported to the utilities subtracted from the amount of energy imported from it
