wiki

Can be satisfied by online or offline resources that are able to respond in 30 minutes or less.

The ability to supply the demand and energy requirements of the end-use customers.

Services necessary to support the transmission of electric power.

ACE. The instantaneous difference between net actual and scheduled interchange.

AGC. Automatic regulation of the power output of generators.

The responsible entity within a Balancing Authority Area.

The collection of generation, transmission, and loads within the metered boundaries of the Balancing Authority.

A direct contract between a seller and buyer outside of a centralized market.

Establishing the voltage from around zero

BES. Transmission Elements and Power resources 100 kV or higher.

BPS. Facilities and control systems for an transmission network.

A market for trading capacity credits.

The uncontrolled successive loss of System Elements triggered by an incident.

A sequence of events in which an initial disturbance triggers dependent component outages.

Load connected to the an existing or planned facility.

COMFEDE. Inactive.

A.k.a. common data format (CDF)

COMTRADE. Inactive.

CGMES.

CIM. A set of open standards for representing power system components

CF.

The unexpected failure or outage of a system component.

Procedures to study a contingency.

A list of network elements to be simulated as disconnected.

Capacity deployed by the Balancing Authority to meet the Disturbance Control Standard.

A.k.a. Primary Reserve. Can be satisfied in 10 minutes or less.

A.k.a. Balancing Authority Area.

CPS1. A standard that measures impact on frequency error.

CPS2. A standard intended to limit unscheduled flows.

Converter-interfaced generation's impact on stability.

CCT. The maximum permissible duration of the fault.

Minimum level of system inertia necessary to ensure deployment of frequency responsive reserves.

Forward markets for electricity to be supplied the following day.

A virtual representation to reflect a physical object accurately.

DER. A source of electric power that is not directly connected to a bulk power system.

The act of distributing gas or electric power to customers.

DFAX.

Provides and operates the “wires” between the transmission system and the end-use customer.

Any perturbation or sudden loss of generation or interruption of load.

DLR. A grid enhancing technology (GET) that provides real-time ratings of transmission lines based on current weather conditions.

Allocation of generating units for economical production.

The behavior of power systems with conventional turbine-generators and variable speed induction generators.

Abnormal system condition that requires automatic or immediate manual action.

A transmission facility rating that reflects operation for a specified, finite period.

To determine the maximum permissible increase in mechanical power input for system stability.

EUE. A measure of the capability to continuously serve loads.

Extend EAC to multi-machine systems.

FFR. Power in response to frequency changes during the arresting phase

An event such as a short circuit, a broken wire, or an intermittent connection.

Trading financially settled products.

FTR. Compensation contract for transmission charges due to grid congestion.

Addressing variability and uncertainty on longer timescales than operating reserves and regulation service.

Portion of the transmission system used to analyze power flow impact.

A change in Interconnection frequency.

The ability of a Balancing Authority to help maintain Scheduled Frequency.

The ability of a system to react to a change in system frequency.

The median of all Frequency Response observations reported annually.

The ability of a power system to maintain steady frequency following a severe system upset.

For contracts for future delivery of a commodity or security.

Generators are adjusted away (off-cost) from their normal assignments (on-cost).

GSF.

Energy transfers that cross Balancing Authority boundaries.

A geographic area where BPS components are synchronized.

A System Operating Limit that, if violated, could lead to instability or cascading outages.

Customer demand that can be interrupted by control or request of the system operator.

IBR. BPS-connected resources that have a power electronic interface.

LODF.

LMP. Marginal price for energy at the location delivered or received.

LOLEV. The number of events in which some system load is not served in a given year.

LOLE. The number of days per year for which the available generation capacity is insufficient.

LOLH. The number of hours per year where demand will exceed the generating capacity.

LOLP.

A venue where participants buy and sell products or services.

The ability to control or affect price.

The rules, mechanisms, and processes under which a market operates.

The unit sets the price of next increment or decrement of energy.

A single contingency that would result in the greatest loss of resource output.

(MCDA)-Based Metrics.

Unconnected to the system but capable of serving demand within a specified time.

A metric focuses on robustness and the ability to withstand events.

Reserve capability within 10 minutes not electrically synchronized to the system

The ability to withstand sudden disturbances while avoiding uncontrolled cascading blackouts or damage to equipment.

Capability above firm system demand required for regulation, load forecasting error, and outages.

Generation synchronized to the system and fully available to serve load within the Disturbance Recovery Period.

Generation or load available to serve load within the Disturbance Recovery Period.

A repetitive motion that can be either undamped, positively damped, or negatively damped.

OTDF.

One definition is about dispath and another is about small-signal stability.

A.k.a. consequence-based metrics. Quantitative approaches for assessing system resilience.

PTDF.

A.k.a. Frequency Response.

PFR. Immediate proportional response to system Frequency Deviations.

A.k.a. Ramp Rate. The rate at which the interchange schedule or generator output is attained.

Use dispatch run to determine the least cost solution to balance supply and demand.

A.k.a. EMS model. A computer representation of the power system facilities.

Bulk power system reliability regions in North America.

Reserve for AGC to provide normal regulating margin.

The probability of satisfactory operation of a power system over the long run.

The collection of generation, transmission, and loads within the boundaries of the Reliability Coordinator.

RAS.

The generating capability that is “standing by” ready for service in the event that something happens on the power system.

A market-based system for the purchase and sale of the Reserves.

The ability to withstand and reduce the magnitude and/or duration of disruptive events.

The behavior of power systems under oscillatory energy exchange conditions.

RSC. Security-constrained resource commitment.

The Ramp Rate that a generating unit can achieve under normal conditions.

Ability to withstand voltage or frequency disturbances and continue operating.

When each set of distribution feeders is interrupted for a limited time and then rotated among individual feeders.

The ability to remain in synchronism under normal and disturbed conditions.

Balancing services deployed in the minutes time frame.

Reserve capability within a 10-to-30 minute interval.

The degree of risk in a power system's ability to survive imminent disturbances.

SCED.

SCUC.

SRI. A daily metric that indicates performance of the BES.

The ability to maintain synchronism when subjected to small disturbances.

A.k.a. Synchronized Reserve. Synchronized generation and ready to serve additional demand.

For short-term contractual commitments.

The ability to maintain equilibrium during normal and abnormal conditions.

The maximum power flow possible while maintaining system stability.

Stability related transmission limits.

Focused on the speed of system recovery during storm events.

Geographic concepts for emission data by EPA.

SSR. A condition involving energy exchange at natural frequencies below the synchronous frequency.

Aligning a device's terminal voltage with another voltage source.

The process of the equipment to synchronize its terminal voltage with another voltage source.

Can be satisfied by online resources in 10 minutes or less.

SM. An AC electrical machine operated with a constant electromagnetic field.

The ability to respond to system changes and uncertainties.

Actions taken to handle current and future contingencies.

Techniques to control contingency or system violations.

The SSR due to torsional interactions between series compensated lines and turbine-generator mechanical shafts.

TSA. Monitor and determine transient stability of the system.

The addition or modification of facilities of the Transmission System.

TIP.

Transmission planning period.

Two types of uncertainty.

To determine commitment of resources.

Power system vendors

VSM. Equipment that includes a DC/AC converter controlled to mimic a conventional synchronous machine.

A.k.a. Voltage Sag. Short-duration decreases in RMS voltage

Voltage limits to protect against wide area voltage collapse.

A.k.a brownouts

The ability of a power system to maintain steady voltages close to nominal value.

WMU, a.k.a. synchro-waveform measurement units (SMUs). Sensor device to record synchro-waveforms.

The purchase and sale from generators to resellers.

A pricing mechanism for a specific zone within a control area.