Adrian Constable Asia Pacific Microgrid Manager
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1 Adrian Constable Asia Pacific Microgrid Manager
2 Integrating Renewable Energy in Distributed Power Networks Adrian Constable Asia Pacific Microgrid Manager Caterpillar Inc
3 Agenda 1. Caterpillar in the Power Generation Industry 2. Critical Success Factors for Successful Projects 3. Integrating intermittent Renewable Energy in distributed power networks
4 Caterpillar Electric Power Division an introduction
5 Caterpillar Electric Power Division In 1939 Caterpillar introduced the first engine manufacturer complete generator set solution 75+ years experience in Electric Power World s largest manufacturer of generator sets 135,000 MW Electric Power generation installed worldwide an introduction Cat D kw Generator Set
6 Caterpillar: World Leader in Power Generation Caterpillar Electric Power Division Manufacturing and Distribution of Reciprocating Engine Generators, Gas Turbines, and Power Systems Distributed Generation from 6.8 kw to 22 MW Diesel, Natural Gas, & Bio-Gas
7 Cat Hybrid Microgrid Power Solutions Powering Sustainable Progress
8 What is Hybrid Power? [Utility Grid or Microgrid] Hybrid Power is any combination of multiple power sources. Utility Power Generator Sets Solar Wind Energy Storage Base Load Power Intermittent Renewable Power (i) UPS (ii) Stability (iii) Time Shift Typically Hybrid Power refers a combination of Base Load Power and Renewable Power.
9 First Generation Cat Hybrid Power Projects Cat Hybrid Power solutions since Mobile Military Hybrid 2011 Jordan Variable Speed Generator Set Solar Photovoltaic Array Hz Variable Frequency Variable Speed Power Conversion and Renewable PV Integration Cat Power Electronics Customer Loads 50 or 60 Hz Constant Frequency Energy Storage Battery or Ultra-capacitor First Commercial Installation 99% Reduction in Fuel Consumption 2-4 Year Payback Period 4 Day Autonomy Battery System Generator Operation: reduced from 8,760 to just 24 hrs/yr Hybrid system has increased redundancy 2012 Military SAGE project The hybrid microgrid power solution with energy storage was assembled by Caterpillar... successfully demonstrated in the SAGE demonstration, meeting the SAGE requirements. Write the specification revisions or new sections to focus on the non proprietary requirements and then include the statement Provide a Caterpillar BDP-250 electrical inverter controller or equal as the key and relatively unique component. US Department of Energy Report, January
10 Problem: Solar Power is Intermittent
11 Problem: Wind Power is Intermittent
12 Normalised Fuel Consumption Maintaining Reliable Base Load Power Existing Generator set efficiencies 2 times the energy for the same quantity of Fuel Peak efficiency at 70-90% of maximum rating Low loading can cause carbon build-up from poor combustion. Poor combustion also causes the injectors to become clogged with soot, causing further deterioration in combustion and efficiency and increased pollution. Generators are required to provide spinning reserve wasting fuel. Rated Power Effective hybrid solutions allow the generator to run at peak efficiency or switch off completely and provide virtual spinning reserve thereby reducing and potentially eliminate fuel consumption.
13 Generator Sets Integrating Renewable Power Cat Photovoltaics Microgrid Solution Cat Remote Monitoring Incorporate and Stabilise Renewable Power A complete integrated Hybrid Power microgrid solution is required for successful renewable power integration. Cat Energy Storage Wind Turbines Customer Prime Power Loads Cat Microgrid Master Controller (MMC) w/demand Mgmt Features Displace Diesel Fuel with Gas or BioGas using existing generator sets Displace Base Load fuel consumption Grid Stability - Stabilise Voltage & Frequency Provide system with Virtual Spinning Reserve (VSR) Utilise Energy Storage to Time Shift Renewable Energy Enables High-Penetration of Renewable Power System optimisation to achieve lowest Levelised Cost of Energy (LCOE) Benefits Retain full capability of the reliable base load Substitute Gas/Diesel fuel with free Solar and/or Wind Energy Optimise System Sizing to meet objectives Reduces emissions
14 Agenda 1. Caterpillar in the Power Generation Industry 2. Critical Success Factors for Successful Projects 3. Integrating intermittent Renewable Energy in distributed power networks
15 Successful Renewable Integration Projects Three Critical Success Factors 1. Essential Pre-Work 2. Optimal System Design & Project Execution 3. Long-Term Field Support
16 Successful Renewable Integration Projects Three Critical Success Factors kw Establish Goals $ $$ $$$ Audit Energy % Improve Efficiency 1. Essential Pre-Work Measure Load Profile AM PM Evaluate Local Resource $ CFP Finance & Permit Project Procure, Construct & Commission 2. Optimal System Design & Project Execution Identify Optimal System Create Detailed Design Design $ $$ Operate System $$$ Maintain System Repair System $ CFP Warrant System Repairs 3. Long-Term Field Support ~ Guarantee ~ System Performance
17 kw 1. Essential Pre-Work Establish Goals $ $$ Audit Energy $$$ % Improve Efficiency Measure Load Profile AM PM
18 kw 1. Essential Pre-Work Establish Goals $ $$ Audit Energy $$$ % Improve Efficiency Measure Load Profile AM PM Key Tasks Lessons Learned What are you really trying to accomplish? What problems can be solved simultaneously with integration of renewables? Establish financial criteria for project success Establish a high-level timeline and budget Customers on a steep learning curve High-penetration renewables is politically desirable, but economic optimum uses mix of traditional generation, renewables, and storage Customers who shift from payback period to levelized cost of electricity see true value Access to capital is absolutely essential. Shift from OpEx intensive to CapEx-intensive
19 Objectives Economic Justification Drivers: Increasing Energy & Operating Costs - fuel & maintenance costs (low CAPEX but high OPEX) Reduced renewable energy hardware pricing (higher CAPEX but much lower OPEX) The Iceberg Syndrome Move from a low CAPEX model to a low Total Cost of Ownership (TCO) model Focus on lowering OPEX: up to 99% reduction in fuel consumption and corresponding on-time of generator sets by harvesting the renewable energy (wind and/or solar) available on-site CAT can design and deliver a complete hybrid power microgrid solution
20 kw 1. Essential Pre-Work Establish Goals $ $$ Audit Energy $$$ % Improve Efficiency Measure Load Profile AM PM Key Tasks Lessons Learned Measure energy usage patterns Measure generation patterns Document equipment efficiency Document waste Energy availability is taken for granted Many users are unaware of waste Smaller generation systems operate frequently at low load factors giving low fuel efficiency
21 kw 1. Essential Pre-Work Establish Goals $ $$ Audit Energy $$$ % Improve Efficiency Measure Load Profile AM PM Key Tasks Lessons Learned Reduce wasted energy usage (unnecessary loads, leaks, redundancy) Install equipment with higher usage efficiency Install generators with higher fuel efficiency Improving usage efficiency is often a costeffective dollar spent (6 mo to 5 yr payback) High efficiency HVAC, lighting, telecom transmission equipment, and insulation are typically the most cost-effective usage improvements Replacing large generator sets with several smaller generator sets can allow higher load factors higher generation efficiencies Smaller generator sets operating at low-load factors can benefit from variable speed operation
22 Normalised Fuel Consumption Optimising and Maintaining Reliable Baseload Power Diesel generator efficiencies 2 times the energy for the same quantity of Fuel Peak efficiency at 70-90% of maximum rating Low loading can cause carbon build-up from poor combustion. Rated Power Large Generators typically more efficient than smaller generators Applications with Single Generator Set Variable Speed Generators Cycle-Charging Generator/Battery Systems (Charge-Discharge) Applications with Multiple Generator Sets Break load into smaller segments, run generator sets at higher load factor Good candidates for Energy Storage as virtual spinning reserve
23 kw 1. Essential Pre-Work Establish Goals $ $$ Audit Energy $$$ % Improve Efficiency Measure Load Profile AM PM Key Tasks Lessons Learned Measure actual load profiles (hourly, minute) Identify load surges (motor starts, current inrush) Forecast loads from new equipment Characterize loads by time of day, week, year Account for efficiency improvements Accurate load profile data is critical for optimal sizing of renewable systems Many commercial / industrial users are far less aware of load profile than utilities Look for opportunities to match loads to times of low-cost generation or renewable availability Identify soft-start or walk-in strategies to reduce load surges and enable less spinning reserve
24 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Design Create Detailed Design $ CFP Finance & Permit Project Procure, Construct & Commission
25 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Obtain site-specific solar radiation from global databases Global Sunlight Map Obtain wind speed from global databases or local weather stations Obtain fuel cost including delivery to site and government fuel subsidies Evaluate site transportation logistics Global Wind Map Perform geotechnical survey for construction conditions
26 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Lessons Learned Obtain site-specific solar radiation from global databases Obtain wind speed from global databases or local weather stations Obtain fuel cost including delivery to site and government fuel subsidies Solar is a widely distributed resource Wind is a highly site-specific resource, typically best on coastlines and mountains Large items are difficult to transport to very remote sites Evaluate site transportation & construction logistics Evaluate site conditions (cursory)
27 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Lessons Learned Make site-specific cost estimates for PV, wind Model site-specific and load-specific performance using computer simulation Evaluate all combinations of PV / wind / storage / gensets Evaluate sensitivity to fuel price, installed cost, renewable resource availability Select 2-3 solutions that offer optimal customer value proposition Renewable penetration level drives need for energy storage in various amounts Low-penetration systems have fastest payback, but lowest fuel savings and can lead to genset light-load issues Medium-penetration systems are attractive at current energy storage prices. Enable engine shut-down High-penetration systems more attractive at high fuel prices or lower energy storage cost points
28 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Lessons Learned Model transient behavior for power quality Model distribution network behavior Perform geotechnical survey for construction conditions site prep, foundations, cable runs Create detailed construction drawings Refine project costs Renewable transient behavior and customer power quality requirement may modify needs for energy storage Connection of renewables to distribution network may cause voltage problems Energy storage system and PV / wind inverters can be used to correct poor power factors and improve system efficiency Fault performance, low voltage ride through, and protection schemes must be adjusted to ensure proper system behavior under all contingencies
29 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Lessons Learned Identify potential sources of grants, loans, leases, or power purchase agreements Create financing structure most appropriate for the project Secure access to site, obtain appropriate permits Access to capital is greatest challenge for renewable energy adoption Availability of sites can be second greatest challenge Governments and local tribes / indigenous peoples often control site availability Wind turbines can be more difficult to permit than PV
30 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission Key Tasks Lessons Learned Coordinate supply and shipment of all components to site Coordinate site build Startup individual systems, overall controls, and demonstrate performance meeting specs Factory integration and test of components Complexity of construction jobs varies widely Low availability of tools and supplies in remote areas can be time-consuming and costly Train local operators
31 3. Long-Term Field Support $ $$ Operate System $$$ Maintain System Repair System $ CFP Warrant System Repairs ~ Guarantee ~ System Performance Key Tasks Perform all tasks to enable system to operate as intended for project life Lessons Learned Many early remote hybrid systems failed due to lack of proper operation and maintenance Operating condition may change over system life Few parties are adequately staffed to service hybrid systems in remote areas Many EPC companies do not offer postcommissioning support System owners can be left to fend for themselves
32 Our Success Depends Heavily upon Field Support Up to 2 Years C Years in Field Operation Caterpillar Non-Confidential
33 Single source your Microgrid power solution One way to reduce risk and ensure integrating of renewable energy is a success Including lifetime support from the same company
34 kw Establish Goals Recap: Critical Success Factors $ $$ Audit Energy 1. Essential Pre-Work $$$ % Improve Efficiency Measure Load Profile AM PM 2. Optimal System Design & Project Execution Evaluate Local Resource Identify Optimal System Create Detailed Design Design $ CFP Finance & Permit Project Procure, Construct & Commission 3. Long-Term Field Support $ $$ Operate System $$$ Maintain System Repair System $ CFP Warrant System Repairs ~ Guarantee ~ System Performance Caterpillar Non-Confidential
35 Agenda 1. Caterpillar in the Power Generation Industry 2. Critical Success Factors for Successful Projects 3. Integrating intermittent Renewable Energy in distributed power networks
36 Typical Renewable Penetration Levels Solar PV Wind System Configurations Fuel Savings Objective Above 40% Renewable Power Size as % Load > 100% (MMC) (ESS) Integration components required 1. Microgrid Master Controller 2. Energy Storage for Stability & Energy Time-Shifting Up to 40% 100% 1. Microgrid Master Controller 2. Energy Storage System (ESS) for stability Up to 20% Up to 10% Up to 60% 15-20% 1. Microgrid Master Controller (MMC) (to control PV and Wind power output for stability) 1. Specific Integration components may not be necessary Up to 5+% 0% 1. Virtual Spinning Reserve Base Load Power
37 Key Features: Integrating Renewable Power Hybrid Power Integration Module Power Problems Plug and play solutions Solar PV and Wind output control Paralleling with other power sources Smallest available footprint High Renewable Penetration possible High system efficiency Harmonic cancellation Transient protection High-speed voltage regulation Power factor correction Low maintenance Quiet operation Manufactured and tested prior to leaving the factory (simple and fast installation) Smooth Power
38 Cat Hybrid Power Analysis and System Optimisation Caterpillar analyses, via computer modelling, all the site inputs and outputs to determine the most effective Hybrid Power solution for each site. Example Time Series Power Flow Chart (5 days) [System with small cloud event battery] This system s battery is sized to support all cloud cover events allowing for smooth transition to generators if the cloud cover lasts longer than a few minutes. Hence generator will shut off if there is enough renewable energy to cover the load. Load Requirement Solar PV Power Generator Power Battery Charge Battery Discharge Diesel Generator Operational Diesel Generator Shutoff
39 Cat Hybrid Power Analysis and System Optimisation Caterpillar analyses, via computer modelling, all the site inputs and outputs to determine the most effective Hybrid Power solution for each site. Example Time Series Power Flow Chart (5 days) [System with larger time shift battery] This system s battery is now sized to store excessive renewable energy production and support increased generator off time. Size of battery is not limited. Generator shut off may last for hours up to days depending on battery and renewable sizing. Load Requirement Solar PV Power Generator Power Battery Charge Battery Discharge Diesel Generator Operational Diesel Generator Shutoff
40 Cat Energy Storage System Stabilizes Voltage & Frequency Without ESS With With Energy ESSStorage System Base Genset Load Load Power Power Request Power Geset System Voltage Geset System Frequency
41 Maintaining Reliable Baseload Power Diesel generator efficiencies
42 Microgrid Design Energy Storage Selection depends upon Duration of Discharge Customer Load Residential & Commercial Sites Very High-Quality Power UPS Filtering & Brief Ride-through Short-Duration Discharge Infrequent Brief Power Outages Power Quality Filter days seconds seconds Brief Voltage Spikes & Sags Battery (Lithium Ion) Flywheel 15 sec - 15 minute ride-through Utra Capacitor Energy Storage milliseconds Cloud Events Photovoltaics Wind Speed Fluctuations Wind Turbines seconds
43 Microgrid Design Energy Storage Selection depends upon Duration of Discharge Customer Load Residential & Commercial Sites Energy Storage System Extended Ride-through Long-Duration Discharge Frequent Long Power Outages hours Energy Time-Shifting Photovoltaics hours Battery (Metal Air or Lithium-Ion) 15 minute -24 hour ride-through Energy Storage Wind Turbines Power Fluctuations seconds
44 Cat Hybrid Power Integration Module (HPM) Fully Transportable Controller Cat Bi-Directional Inverter Cat Mirogrid Master
45 Integrating Renewable Power Microgrid Solution Generator Sets Cat Photovoltaics Cat Remote Monitoring Customer Prime Power Loads Cat Microgrid Master Controller (MMC) w/demand Mgmt Cat Energy Storage Wind Turbines
46
47 Caterpillar Non Confidential
48 The Hybrid Microgrid solution
49 Example: Smart and Green Energy projects (SAGE) Cat Hybrid Microgrid solution with Cat Hybrid Power Integration Module & solar PV The hybrid microgrid power solution with energy storage was assembled by Caterpillar... successfully demonstrated in the SAGE demonstration, meeting the SAGE requirements. Write the specification revisions or new sections to focus on the non proprietary requirements and then include the statement Provide a Caterpillar BDI-250 electrical inverter controller or equal as the key and relatively unique component. US Department of Energy Report, January
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