Asia Clean Energy Forum Manila, 15-Jun MiniGrid Stability and RE Integration: Technical Challenges
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1 Asia Clean Energy Forum Manila, 15-Jun-2015 MiniGrid Stability and RE Integration: Technical Challenges José A. Aguado, PhD Professor, University of Malaga (Spain) Grid Expert, Effergy
2 Effergy is a Renewable Energy Consultancy company created in Expertise lies mainly in the field of renewables, with a wide and extensive international experience in consultancy, research and capacity building. Effergy s Minigrids Projects under ADB: Maldives, Sri Lanka and Bangladesh
3 Agenda Why Minigrids? RE Integration Challenges Available Solutions Minigrids, Challenges, Solutions
4 Towards high RE penetration Minigrids Ambitious RE targets have been set worldwide High RE penetrations results in technical challenges for System Operators Minigrids are the ideal platform to start realizing tomorrow s energy technologies today.
5 Hybrid Minigrid Project Phases Feasibility Study Detailed Engineering Installation & Comissioning Operation & Optimization Suppliers Each system has its own optimal RE penetration rate. However, there is no technical limitation for 100% RE if we implement proper actions
6 Technical Challenges in Hybrid Minigrids Inherent volatility of renewable energy can compromise grid stability The renewable energy integration solution must address requirements traditionally fulfilled by diesel generation (base load) Sufficient spinning reserve Sufficient active and reactive power supply Peak shaving and load leveling Load sharing between generators Frequency and voltage control Fault current provision Renewable energy generation capacity should be sized to maximize ROI and fuel savings
7 GRID STABILITY ASSESSMENT Grid Stability Assessment Low penetration <20% OK RE power limiting (inverters) Installation of secondary diesel units Variable RE (solar, wind, etc.) Medium penetration 20-60% Affects grid quality Instability of grid Relatively simple control system required Short-term energy storage (flywheels, etc.) Load shedding Source: NREL High penetration > 60% Low loading (aprox.30%) Reduced efficiency Reduced life span Affects grid quality Instability of grid Sophisticated control system required SMART MINIGRIDS RE power limiting (advanced inverters) Replacement of specialised low load diesel Long-term energy storage Load shedding Demand-side management (smart metering, etc.)
8 Technical Challenges in Hybrid Minigrids Stability Region for Safe Operation
9 Technical Challenges in Hybrid Minigrids Input Data Minigrid Model Output Data
10 Technical Challenges in Hybrid Minigrids Technical risks: Secure Operation System Stability Power Quality f [Hz] f dyn f stat t [sec] Primary Control: Droop control Secondary Control: Power Plant Controller. Frequency nadir Governor response AGC/manual frequency recovery
11 Frequency Control Strategies
12 Available Technology for High RE penetration Energy Storage for Grid Support Active Control Power Balance of Variable Resources More flexible Diesel GenSets Enhanced EMS: Improve Wind & Solar Forecasting Demand Response to handle RE
13 High Resolution Battery Cycling Simulation Tool
14 Case Study: Maldives
15 Case Study: Maldives Island Data Electricity Demand 1,230 MWh/yr RE penetration 35% Solar Power 300 kw Wind Power 0 kw Storage Power 223 kw Diesel Power 254 kw
16 Case Study: Maldives 12,000,000 $ NPC - LCOE 0.70 $/kwh 10,000,000 $ 8,000,000 $ 6,000,000 $ 4,000,000 $ Total Net Present Cost Levelized Cost Of Energy 0.60 $/kwh 0.50 $/kwh 0.40 $/kwh 0.30 $/kwh 0.20 $/kwh 2,000,000 $ 0.10 $/kwh 0 $ BASELINE NO RES NO BATTERY NO BATTERIES (Max RES 15%) OPTIMUM 0.00 $/kwh
17 Case Study: Maldives Electricity generation - CO 2 Emissions 1,400,000 kwh/yr 1,200,000 kwh/yr 1,000,000 kwh/yr 1,800.0 Ton/yr 1,600.0 Ton/yr 1,400.0 Ton/yr 1,200.0 Ton/yr PV array New Diesel Diesel 2 Diesel 1 800,000 kwh/yr 1,000.0 Ton/yr CO2 Emissions 600,000 kwh/yr Ton/yr 400,000 kwh/yr Ton/yr Ton/yr 200,000 kwh/yr Ton/yr 0 kwh/yr BASELINE NO RES NO BATTERY NO BATTERIES (Max RES 15%) OPTIMUM 0.0 Ton/yr
18 Case Study: Maldives 700,000 L/yr Fossil fuel consumption 600,000 L/yr 500,000 L/yr 400,000 L/yr 300,000 L/yr 200,000 L/yr 100,000 L/yr 0 L/yr BASELINE NO RES NO BATTERY NO BATTERIES (Max RES 15%) OPTIMUM
19 Battery Storage for Grid Support: Buruni Battery Performance
20 Example: Maldives-Buruni Battery Performance Before After P= 150 kw P= 150 kw Q=112.5 kvar Q= kvar Irradiance=1000 W/m2 Irradiance=200 W/m2 Diesel 1 Switched on Diesel 1 Switched on Diesel 2 Switched off Diesel 2 Switched off
21 Example: Maldives-Buruni
22 Example: Maldives-Buruni
23 Example: Maldives-Buruni
24 Final Remarks High RE minigrids poses technical challenges that have to be understood Technology to install and operate minigrids with high renewable energy contribution is now proven and commercially available Extensive simulations and experience are requiered to optimize and engineer the systems using verified models
25 José A. Aguado, PhD High RE penetration Minigrids, Looking Ahead!
26 Grid Stability Assessment 20% Ok 60% Simple Controls >60% Enhanced Controls
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