Contents. 1. Introduction. 2. Construction. 3. Operation Plan

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2 Contents 1. Introduction 2. Construction 3. Operation Plan 2

3 Demonstration Goal 1. Introduction Demonstrate DC System Improved 10% Efficiency Compared with System Over 70% Renewable Fraction and Decrease Carbon Emission(490t/yr) Interface Efficiency Decrease Transfer Loss Retain Transfer Efficiency Hybrid Home Fuel Efficiency DC Home (DC Appliance) [Goal of each part of DC Island] [HOMER Simulation Result of Demonstration Site] 3

4 Site Introduction 1. Introduction Site : Seogeochado(Island located 24km from main land of South Korea) One of an Island of Geochado(Consist of Seogeochao and Donggeochao) 구분 Site 내용 Island located 24km from land Population : 100 (70 household) Power Consumer 150kW x 3 Diesel Generator 380/6.6kV x 2 Transformer Home and Public Facilities Commercial facilities (Purification plant, Drying Rack) Average : 124kW (Geochado) Maximum : 305kW (Geochado) 24km Cost Price : 920 Won/kWh Cost : 930 million Won/yr 4

5 Demonstration Outline 1. Introduction PV(200kW), WT(100kW), ESS(1.5MWh), AVS* Diesel Generator(200kW) 750 Vdc, ±750 Vdc, ±190 Vdc DC Line(4km) and DC Consumer System Residential 1) Welfare Center (±190Vdc) 2) Health Center (±190Vdc) 3) Police Office (±190Vdc) 4) Church A (±190Vdc) 5) Church B (±750Vdc) 6) Purification Plant (±750Vdc) 7) Home #1 (±190Vdc) 8) Home #2 (±190Vdc) 9) Home #3 (±190Vdc) 10) Home #4 (±190Vdc) Commercial 1) Drying Rack #1 (±750Vdc) 2) Drying Rack #2 (±750Vdc) DC 1) DC Home (DC Appliance) AVS : Adjustable Varying Speed [DC Island Component Layout] [Site Target ] 5

6 System Configuration 2. Construction Interface Existing System and New DC System using /DC Converter Supply Power by Existing System when New DC System shutdown [Power System Configuration of DC Island] 6

7 Distributed Energy Resource 2. Construction Interface PV(200kW), WT(100kW), ESS(1.5MWh) with DC Link(750Vdc) Interface AVS Diesel Generator System(100kW) with DC Link(750Vdc) 100kW WT 200kW PV 1.5MWh ESS Constant MPPT MPPT AVS Monitoring Control DC Link ( 750 Vdc ) Operation System AVS : Adjustable Varying Speed 200kW Diesel Generator 7

8 DC Home Consumer 2. Construction Home available both /DC power by DC Panel ant Control Terminal Home ESS PV DC Meter and ADR System installed for DC Home ADR Client CCT Home ESS Home ESS Home PV DC Appliance EMS DC Distribution Panel ADR CCT* Panel DC Appliance ±190Vdc ±190Vdc DC Meter Appliance DC Meter 220Vac 220Vac CCT : Cabinet Control Terminal Meter 8

9 DC Public Consumer 2. Construction 5 Electric Vehicle pluged with DC Distribution System by 3 V2G Station Solar Wall(Rooftop), Heat Storage(1 st Floor) and Heat Management System Control Center LED Streetlight V2G Station Heat Storage Tank Heating Charge Solar Heat Control Center V2G V2G V2G Discharge LED Streetlight Commercial (Drying Rack) Solar Wall Commercial (Drying Rack) EV 9

10 DC Operation System 2. Construction Communication Interface with Fiber Optic Cable and Monitoring by DC EMS SCADA, HMI and Real-time Applications for DC System installed in EMS [HMI System Diagram] [HMI Main Window] [HMI PV Window] [HMI WT Window] 10

11 Demonstration Scenario 3. Operation Plan [1 st Step] Isolated DC Operation : DC System Test and Demonstration [2 nd Step] Isolated Operation : Mode Conversion for Efficiency Comparison [3 rd Step] Interface Operation : Stability Test and Use Rest Renewable Energy New DER Seogeochado Seogeochado DC Demonstration DC New DER Demonstration New DER v Seogeochado Demonstration Seogeochado Rest Seogeochado Rest Seogeochado Rest Existing DG Donggeochado Existing DG Donggeochado Existing DG Donggeochado [1 st Step : Isolated DC Operation] [2 nd Step : Isolated Operation] [3 rd Step : Interface Operation] 11

12 Operation Strategy 3. Operation Plan [Conventional Mode] DC System DER Operation based SOC of ESS [Advanced Mode] DC System DER Operation by DC Applications SOC(%) State ESS WT/PV AVS Diesel Generator DC Scheduler Program Optimal DER Scheduling base Forecasting SOC<30 Constant PV: Output Limit WT: Output Limit Start DC Network Analysis Programs DER Output Adjustment to solve Violation 30 SOC<80 Constant PV: MPPT WT: MPPT Stop 80 SOC<85 Constant PV: Output Limit WT: MPPT Stop 85 SOC<90 Constant PV: Stop WT: MPPT Stop 90 SOC Constant PV: Stop WT: Stop Stop [Conventional Mode based SOC] DER : Distributed Energy Resource [Advanced Mode by DC Applications] 12

13 Q & A 13