electric grid operations tadp 543
TRANSCRIPT
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Transmission & Distribution Program
Electric Grid Operations TADP 543
Review Elements of the
Electric Power Grid
Module 3.1
Instructor: Julie Reichle
Audio: Marc Patterson
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Introduction
This module presents:
The WECC standards and describes how the balancing authorities adhere to them.
Responsibilities and authorities specified by NERC standards, tools and data required for reliability coordinators, methods of operations planning and current day operations, and the methods for transmission loading relief.
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What will be Learned
• How to analyze the transmission system and
determine if it meets NERC/WECC reliability
requirements and compliance standards.
• To do this, you will need to have a detailed
understanding of the NERC/WECC Reliability
Standards
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Review Definitions and Terms
Before we start reviewing the standards we need to
review some definitions and terms.
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Operational Constraints
• One of the keys to maintaining proper functioning of the grid is to operate within voltage boundaries.
• In addition, connected load and generation must match in order to maintain proper frequency.
• If the load is greater than generation the frequency will decrease.
• If generation is greater than load the frequency will increase.
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Voltage and Frequency Control
Terms on the following pages are used in this
class.
Knowing these definitions will help you understand
our voltage control and frequency discussions.
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Ampere
The unit of measurement of electrical current. One
Ampere is the unit of current produced in a circuit
by a potential of one volt acting through a one
ohm resistance.
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Capacitance
Property of an electrical circuit which opposes any
change of voltage - developed when two conductors
are separated by a dielectric.
Measured in farads or microfarads (μf).
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Capacitor
A device used to introduce capacitance into a
circuit. They are typically switched on and off with
a breaker.
Shunt
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Property of an electrical circuit which produces an
electromotive force (emf) by induction when the
current is changing. Inductance opposes current
changes and is measured in Henries (h).
Inductance
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Inductor
A device, usually a coil, which introduces
inductance into a circuit.
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Load Diversity
Difference between the sum of the maximums of
two or more individual loads and the coincident or
combined maximum load.
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Load-Tap-Changer (LTC)
A means to mechanically change transformer
winding taps without de-energizing the transformer.
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Power Factor
Cosine of the difference in phase angle between
voltage and current (or real and apparent power) in
an electrical circuit.
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Reactance
Opposition (in Ohms) to current flow caused by the
inductance and/or capacitance of an AC circuit.
Reactance is dependent upon both frequency and
circuit inductance and/or capacitance. Inductive
reactance is denoted XL and capacitive reactance
XC.
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Reactor
A coil used to introduce inductance into an AC
circuit. In power systems they are typically
switched on and off through a circuit breaker.
Shunt
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Resistance
The property of materials that hinders the flow of
electrical current
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Static VAR Compensator (SVC)
A system of capacitors and reactors controlled by
solid state electronics to be a rapidly deployed
Source or Sink of reactive power (VARs).
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Volt-Amperes Reactive (VAR)
The unit of measurement of reactive power
• f = frequency in Hertz
• L = inductance in Henries
• C = capacitance in farads
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Reliability Standards
Reliability Standards
– GENERATION CONTROL AND PERFORMANCE
– TRANSMISSION
– INTERCHANGE
– SYSTEM COORDINATION
– EMERGENCY OPERATIONS
– OPERATIONS PLANNING
– TELECOMMUNICATIONS
– OPERATING PERSONNEL AND TRAINING
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ACE
Area Control Error (ACE) is the algebraic sum of
the net scheduled and net actual interchange and
the Biased scheduled and actual system
frequency.
ACE is used to determine a control area’s
performance with respects to its impact on system
frequency
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CPS
Control Performance Standard (CPS)
Each control area shall monitor its control
performance on a continuous basis against two
Standards: CPS1 and CPS2.
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CPS1
CPS1 assigns each Control Area a slice of
responsibility for control of the Interconnection
frequency.
CPS1 is a yearly standard that measures impact
on frequency error, with a 100% minimum score.
Over a year, the average of clock-minute averages
of a control area’s ACE divided by -10β (β is
control area frequency bias) times the
corresponding clock-minute averages of
Interconnection’s frequency error shall be less
than a specific limit.
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CPS2
CPS2 is a monthly standard that limits
unscheduled flows.
The minimum CPS2 score is 90%.
The average ACE for each of the six, ten-minute
periods during the hour (the ten-minute periods
ending at 10, 20, 30, 40, 50, and 60 minutes past
the hour) must be within specific limits, referred
to as L10.