RENEWABLE ENERGY INTEGRATION IN OFF-GRID APPLICATIONS: Placing the grid stability at the heart of hybrid systems Asia Clean Energy Forum 2015 Manila 15-19 June 2015
Dec 22, 2015
RENEWABLE ENERGY INTEGRATION IN OFF-GRID APPLICATIONS:
Placing the grid stability at the heart of hybrid systems
Asia Clean Energy Forum 2015 Manila
15-19 June 2015
Subsidiaries• RE plants
25 YEARS’ experience on REMOTE and INSULAR areas
1992: first hybrid system
40 WIND & PV plants installed on islands worldwide
5 continents - 35 countries
4 subsidiaries of maintenance and local partners
Vergnet Hybrid systems : solutions based on field experience
RELIABLE RENEWABLES FOR ISLANDS GRIDS & REMOTE INDUSTRIES
Hybrid ?
What is really at stake : grid stability
One step beyond: Hybrid Wizard ©
Case study 1: Hybrid PV for remote island
Case Study 2: Wind –diesel for mining company
Case Study 3: High Penetration Wind-Battery
system for island
What decision makers should look at?
Why HYBRID?
100kWp = 47 T of diesel fuel saved/year
1 GEV MP-C Wind Turbine = 200 T of diesel fuel saved / year
Choosing the right technology for the site(resource, loads, weather, land, etc.)
Optimizing the design for the best ROI (Homer, Copex, etc.)System design Diesel + PV Diesel + Pv +Wind
+500kW/560kWhDiesel + Pv +Wind
+1MW/1MWh
€/l Diesel fuel 0.7 1.0 1.34 0.7 1.0 1.34 0.7 1.0 1.34
CapexCOE (Cost ofElectricity) in €/kWh
0.24 0.34 0.45 0.21 0.26 0.31 0.17 0.20 0.23
Renewables share 8.2% 54% 77%
Hybrid systems, what is at stake: Intermittent energy, Variable load
Efficient Hybrid control is the key
f
t
limit
Renewables Integration Issues Example : FREQUENCY (transient)
G G
No renewables:Working on Diesel Generator.No particular issues detected. (Stable production)
Without hybrid controller:The line of the PV plant is struck by lightning. It leads to a drop in produced power, thus a frequency drop.
Consequences: unwanted tripping leads to blackout of the grid.With Hybrid Wizard:Blackout has been avoided.
INTEGRITY / SERVICE CONTINUITY
50 Hz Without hybrid controller:The genset power increase speed is not high enough, no quick order to start additional genset,. Frequency drops and protection trips, disconnecting the genset and leading to a blackout.
Without hybrid controller:At first the grid is stable.
G
With Hybrid Wizard:Hybrid Wizard detects a risk of instability (resilience of the grid too low) and decides to add a Genset for spinning reserve or limit renewable power.
With Hybrid Wizard:Thanks to additional genset, the frequency drop does not overpass the limit.
With Hybrid Wizard:At first the grid is stable.
G
Network analyzer
G G
Hybrid system What is at stake?
Whatever the choice and complexity of the technology
(PV, wind, PV+wind, PV+wind+storage, etc.)
Whatever the size of the project
Whatever renewables penetration target rate
Grid stability must drive the design and the operation of the hybrid system during life cycle
Grid
Network analyzer
PV + inverter
Gensets
LOADSWind turbines + PLC
One step beyond : Hybrid Wizard ©One or several power analyzers are distributed on the grid
Most of the time, network analyzers are linked with an optical network
VoltageFrequencyCurrentFlickers coef.Harmonics (%)Grid resilience
SCADA
All measured values are transmitted to Hybrid Wizard ©
Optical fiber
Power instructions
Power instructionsHybrid Wizard © calculates in real-time new power instructions
Samoa 550 kW wind farm (running)
Kiribati 500 kWp PV plant (building)
Mauritania4.4 MW wind farm(running)
1.3 MWp PV plant(building)
Case Study 1: Wind diesel system for Mining companyLocation Mauritania
Technology Hybrid wizard controler, no storage
Installed Capacity
Wind: 4400kW
Diesel: 4 x 4000 kW
Peak load 10 000 kW
Case Study 1: Actual average penetration of Renewables since June 2013
= 1 TURBINE PAID FOR
AVERAGE WIND SHARE: 30%
FUEL CONSUMPTION: - 30%
DIESEL SAVINGS: 4 800 T /year
EVERY 3 MONTHS
Case study 2: Hybrid PV system for remote islandLocation Kiribati
Hybrid Technology
Hybrid Wizard controler
Installed Capacity
PV: 1.3MWp (400+500+400kWp)
Diesel: 5.45MW
Peak load 3500 kW (Week)
Case study 2: Hybrid PV system for remote island
POSSIBLE OVERCAPACITY OF PV PRODUCTION
DURING WEEK-END
Hybrid Wizard:
Real time management of PV
and Diesel power plants
Fuel savings: 596 T / year
Genset minimum setpoint: 30%
Case study 3: High penetration Wind-Diesel system for island
Location Caribbean Island
Hybrid Technology Hybrid Wizard controler
Installed Capacity
Wind: 1.925MW
PV: 114kW
Diesel: 1.9 MW
Battery for spinning reserve
Peak load 1.3 MW
Case study 3: High penetration Wind-diesel system for island
Wind
Genset
PVWind
Genset
PV
WIND POWER
BATTERY
AVERAGE RE SHARE
PEAK RE SHARE
RE USAGE
DIESEL SAVINGS
1.37MW
NO
40%70%
100%
1 039 m3/year
1.92 MW
YES
70%90%
100%
1 418 m3/year
Option 1: Hybrid Wizard without Battery storage
Option 2: Hybrid Wizard + Battery storage for spinning reserve
What should Decision Makers look atfor a successful off-grid projects implementation?
• Always keep grid stability as the driver for the system requirements• Consumption: minimum and maximum loads, grid parameters• Possibility of performing grid measurements, identify weak points, etc.
• Technology choice must be the result of the feasibility, not an a priori choice• Renewable resource assessment• Technology choice fit to the local situation (high perfo batteries in remote and sandy areas?)
• Set reasonable targets for penetration rates and have a step by step approach• Grid stability: the project must be immediately a success• Possibility to improve the system and targets : technology is evolving fast
• Project a flexible system, able to adapt to the grid evolutions• Possible evolutions of the consumption• Integration in the plans for development of the infrastructures of the territory
• Take Operation & Maintenance into account from the very beginning of the project• Technological choices and targets must fit to the local capability and infrastructures• If knowhow is not already present, include a capability building program
Technology is ready
Significant savings with high quality & reliability
Short payback time if good resource
Thank you
Istvan Ponsot – [email protected]