AC

alternating current

AWPT

Advanced Wind Prediction Tool

BETTA

British Electricity Trading and Transmission Arrangements

CCGT

combined cycle gas turbine

DC

direct current

DFIG

doubly-fed induction generator

DSO

Distribution System Operator

DTI

Department of Trade and Industry (UK)

EMS

energy management system

FACTS

flexible alternating current transmission system

GTS

Global Telecommunication System

HIRLAM

High Resolution Limited Area Model

HV

high voltage

IGBT

insulated-gate bipolar transistor

ISO

Independent System Operator

LDC

line drop compensation

MAE

mean absolute error

MOS

model output statistics

NETA

New Electricity Trading Arrangements (BETTA s predecessor)

NFFO

Non-Fossil Fuel Obligation

NWP

numerical weather prediction

OCGT

open cycle gas turbine

OFGEM

Office of Gas and Electricity Markets (UK)

PFCC

power factor correction capacitance

PI

proportional + integral

PWM

pulse width modulation

RAS

remedial action scheme

RMSE

root mean square error

ROC

Renewable Obligation Certificate

ROCOA

rate of change of angle

ROCOF

rate of change of frequency

SCADA

supervisory, control and data acquisition (system)

SDE

standard deviation of errors

SEM

Single Electricity Market (Ireland)

STATCOM

static compensator

SVC

static VAr compensator

TSO

Transmission System Operator