Economic Evaluation Program for Transmission Planning in Competitive Power Market LEE, SANG-HO Fusion Technology Research Lab. K-EMS Development (Korean Energy Management System)

2 Main Usage A method to evaluate the transmission expansion planning in competitive power market Analysis tool to reduce the congestion cost Analyze the effect of generators and consumers’ location Other Examples ABB (GridView) : congestion cost analysis and transmission planning evaluation CAISO (TEAM: Transmission Economic Assessment Methodology )  Analysis of consumer surplus, supplier surplus and social surplus due to new transmission expansion  Using PLEXOS (Drayton Analysis) - market simulator

3 Definition of Congestion Cost Social Surplus Social surplus = Supplier surplus + consumer surplus + congestion surplus Congestion cost : difference of social surplus due to congestion Economic evaluation of transmission facility : difference of social surplus due to transmission facility Weak point : hard to get the consumer’s benefit function Alternative idea for social surplus Assumption : consumer is inelastic to price ∆(social surplus) ≈ ∆(production cost) Suitable for Korean power system

4 Program Flowchart

5 Easy data edit : DB data editable in grid view table Various option for efficient simulation Characteristics of the program Various option for transmission expansion planning Convenient MMI for users I/O design for common used format like Excel and text editor Simulation Process View Data Grid View Data Tree View Simulation Option Window

6  Data Tree View Bus, Gen., Line, Load data as major power system components Input file format : PSS/E v30 raw file, MS ACCESS (*.csv) file  Data Grid View Elements of data tree is shown Direct edit action is adapted to DB  Simulation Option Window Set various simulation option  General option : simulation period, I/O expressions on simulation process view, save option  Optimization option : base MW, slack bus, linearization option  Simulation Process View Easy verification of simulation result through each module

7 Result data table and graph Result Data Graph Result Data Table Graph Option

8 Case Study New England 10 Gen. 39 Bus System

9 Base case optimal generation output for 24 periods

10 Transmission expansion planning  scenario 1 : another line added at bus 1 ~ bus 2  scenario 2 : another line added at bus 16 ~ bus 17  scenario 2 : another line added at bus 16 ~ bus 19 Scenario 1 Scenario 2 Scenario 3

11 Generators ’ outputs for each scenario Gen. 31 Gen. 30 Gen. 32

12 Total costs for each scenario Cost base case14,978.5 scenario 114,976.1 scenario 214,963.9 scenario 314,962.9

Economic Evaluation Program for Transmission Planning in Competitive Power Market K-EMS Development (Korean Energy Management System)

14 K-EMS Configuration Communication Network Weather Infom. Lightning Chart Recorder Dispatcher Console Training Simulator Main SystemBackup System Main Display NuclearThermalHydro765kV Subst. 345kV Subst. 154kV Subst. Local Control Center Main Control Center Backup Control Center Main Display Dispatcher Console

15 Key Technology IT Technology Power System Technology Real-time Data Processing Real-time Data Processing Communication & Network Communication & Network Large Volume Database Large Volume Database High Reliability High Reliability Automatic Generation Control Automatic Generation Control Economic Dispatch Economic Dispatch State Estimation State Estimation Power Flow Power Flow Optimal Power Flow Optimal Power Flow Contingency Analysis Contingency Analysis Load Forecast Load Forecast Dispatcher Training Simulator Dispatcher Training Simulator Dispatcher Scheduling Optimization Dispatcher Scheduling Optimization SCADA Historical DB Historical DB

16 Data consistency / synchronization API & Message Service Handler NETWORK ANALYSIS EMS Data Base DISPATCHER TRAINING SIMULATOR GENERATION MANAGEMENT SYSTEM SCADA SYSTEM MIDDLEWEAR

17 Historical Database Network Database Generation Database SCADA Database Data consistency / synchronization API & Message Service Handler User Interface Navigation Graphic User Interface Data Acquisition/Control Protocol Handler SchedulingComm. Error Handler Remote Control Data Processing Alarm/Event Process Analog/DigitalPulse/Process Data Verification Generator RTU Substation RTU RCC SCADA NEMS/JEJU EMS SCADA SYSTEM EMS Data Base

18 Data consistency / synchronization API & Message Service Handler NETWORK ANALYSIS EMS Data Base AGC /Reserve Economic Dispatch SCED Production Cost Market Connection Offline OPF Security Enhancement Overload SE Gen. Target Base Point, P.F Generation Redispatch, Tap, Shunt reactive equipment Redispatch Generation Management System DOS/AS (Reserve & Energy) Load Forecasting Unit Commitment

19 DISPATCHER TRAINING SIMULATOR Data consistency / synchronization API & Message Service Handler EMS Data Base Data Converter PSS/E format Network Analysis Maintenance Scheduling ATC Power FlowFault Analysis Dispatcher Power Flow Load Forecasting Trans. Loss Factor Voltage Scheduling Offline study ED/AGC State Estimation Power system modeling Contingency Analysis Overload Relief

20 DISPATCHER SIMULATOR DISPATCHER SIMULATOR DISPATCHER TEACHER SIMULATION Control Realtime DB Snap-Shot EMS Database EMS Functions NETWORK ALALYSIS NETWORK ALALYSIS GMS SIMULATION (AGC, LFC, ED …) GMS SIMULATION (AGC, LFC, ED …) Power Flow Solver Power Flow Solver GEN. INFO. POWER SYSTEM STATE Control Data Power System Modeling Database Power system & Gen. Snap-Shot DISPATCHER TRAINING SIMULATOR NETWORK ANALYSIS Data consistency / synchronization API & Message Service Handler EMS Data Base

21 Baseline EMS Prototype EMS Full-scale EMS SCADA Basic Function Test Bed ED, AGC Load Forecast, Reserve, A/S SE, Power Flow Transmission Loss Factor Training Simulator Design SCADA Basic Function Test Bed ED, AGC Load Forecast, Reserve, A/S SE, Power Flow Transmission Loss Factor Training Simulator Design SCADA Development Optimal Power Flow SCED Voltage Scheduler Training Simulator Development SCADA Development Optimal Power Flow SCED Voltage Scheduler Training Simulator Development Optimal Gen Scheduling Security Enhancement ATC Fault Analysis Contingency Analysis Training Simulator Test Optimal Gen Scheduling Security Enhancement ATC Fault Analysis Contingency Analysis Training Simulator Test Baseline Target Prototype Target Full-scale Target