Solutions for On-Grid and Off-Grid Battery Storage

Transcription

1 Cell-To-Grid Solutions for On-Grid and Off-Grid siemens.com/answers

2 Regenerative energy 2 Battery storage 5 Investment potential 9 Motion-to-Grid 11 Solutions battery storage 17 Example topology 22 Summary 24 Page 2

3 Megatrend Energy storage with renewable energies Regenerative Energy Long-term global trend toward most cost-effective renewable energy sources Grid stability Time-based statistically distributed availability of the "renewables" Maximization of time-based availability thanks to energy storage on different time scales (hours to seasons) Battery = hourly and/or daily storage Grid infrastrukture Local decentralized availability of renewable primary energy leads to decentralized power generation Result: Cost benefit of decentralized consumption Long-term global trend of decentralization in power generation and consumption Page 3 Bilder: umweltvinschgau.files.wordpress.com (links), spektrum.de (rechts), 2014.

4 Regenerative energy 3 Battery storage 4 Investment potential 9 Motion-to-Grid 11 Solutions battery storage 17 Example topology 22 Summary 24 Page 4

5 Battery storage Use cases Peak shifting Measures for integrating renewable power generation into grids based on battery storage: Reduction in maximum photovoltaic feed-in power ("peak shifting") Grid support for voltage and frequency Provide uninterrupted availability of regenerative energy Increase in decentralized consumption (e.g. photovoltaic private consumption) Power grid back up Dynamic and und static power grid backup Provide short circuit current to the power grid. Islanding power grid Decentralized power supply structure with minimal / no grid availability and fossil-based, local reserves / full supply (e.g. diesel generator) Replacement of fossil fuels by battery storage from renewables with island grid (e.g. island grid supplied via battery + PV + possible diesel generator) Back-up system for power grid failure or off-grid, self-sufficient island grid Page 5

6 Battery storage Use cases Peak shifting Measures for integrating renewable power generation into grids based on battery storage: Reduction in maximum photovoltaic feed-in power ("peak shifting") Grid support for voltage and frequency Provide uninterrupted availability of regenerative energy Increase in decentralized consumption (e.g. photovoltaic private consumption) Power grid back up Dynamic and und static power grid backup Provide short circuit current to the power grid. Islanding power grid Decentralized power supply structure with minimal / no grid availability and fossil-based, local reserves / full supply (e.g. diesel generator) Replacement of fossil fuels by battery storage from renewables with island grid (e.g. island grid supplied via battery + PV + possible diesel generator) Back-up system for power grid failure or off-grid, self-sufficient island grid Page 6

7 Overview: Battery storage units background information: Analysis of the low-voltage grid structure Result: Critical grid structures for new PV capacity are: Suburban grids Village grids Rural grids Solution approach: Active power draw for voltage reduction Battery storage can be economically viable as voltage reduction can also be controlled by providing reactive power during times when the battery is full. Source: IBC Solar, grid stabilization Source: Witzmann, Clusterforum: grid integration, photovoltaics 03/2010 The rapidly advancing private solar expansion and the associated cyclic overshoot of grid voltage create problems/costs for grid operators. High potential for inverters in 30kW 100kW battery storage units. Page 7

8 Regenerative energy 3 Battery storage 5 Investment potential 8 Motion-to-Grid 11 Solutions battery storage 17 Example topology 22 Summary 24 Page 8

9 Analysis: Market potential for solar peak shifting buffers in Germany Currently installed solar peak power in Germany MWp 20% Medium Voltage MWp 80% Low Voltage MWp 50% Industrial / City MWp 50% Country Side private investors MWp 60% Sizing of the inverter MWp Market potential: MWp to store pcs. 36kW C2G Systems Page 9

10 Regenerative energy 3 Battery storage 5 Investment potential 9 Motion-to-Grid 10 Solutions battery storage 17 Example topology 22 Summary 24 Page 10

11 Motion-to-Grid (M2G) Turbines (3~ AC, Motion ) ALM Wind Water Biogas, etc. Cells (DC) Not in focus SINAMICS M2G - Solution SINAMICS LD M2G - Solution Additionally available Siemens-Solutions DC-Energy sources Battery storage Modular Energy Conversion Solutions with SINAMICS from 16 kw up to 228 kw (228 kw = 2* 120 kw SINAMICS S120 ALM in parallel with one CU) Page 11

12 Our value added topics Units Flexible and modular solution Solution for integration and combination of any DC- Power sources easy DC-Power to grid conversion Full feature set Available core features like islanding and resynccapabilities ready to use solution for all energy on/off grid distribution use cases Spare part By only using SIEMENS standard converter components worldwide and fast spare part support Startup Support Customer specific close expert support from APC Erlangen fast project startup and prototype completion Standards conform back- end Fully certified standard back- end and support during unit certification reduced project risk Page 12

13 Motion-to-Grid Description of components and features (Micro)Grid Add-ons Motion-to-Grid System DC sources Batteries Options Generator(s) Grid feed-in Unit Photovoltaics Fuel Cells Battery Uninterrupted Power Supply, Electronic Braking (Fast Power Dump to respond to sudden faults) Flywheel (buffer to handle short-term energy unbalance) One or more generators may be connected to the DC Link Individual Control (Torque or Speed) Staging Standard feed-in Unit, kw Additional Filters and Device for Power and Grid Status Monitoring according to local Grid Codes Option Islanding with Black start and Resync capability Proven Solution for On-Grid Generator-based RE Systems, seamlessly expandable with Off-Grid and Microgrid functionality. Page 13

14 M2G Solution Mapping the Microgrid Topology to the Island Grid Connection Inter-Grid Connection REU (Renewable Energy Unit) Local Consumers Public Grid or Genset / other REU Turbine Battery ALM + AIM + VSM Transformer Contactor VSM Local Grid with single-phase and three-phase consumers Contactor VSM PV Page 14

15 Use Cases Island Grid Connection Inter-Grid Connection REU (Renewable Energy Unit) Local Consumers Public Grid* or Genset / other REU Stand Alone Microgrid (Island Grid) External Grid Connection (optional) *) A Public Grid is considered as the dominant grid master, i. e. the REU has little (if any) influence on the grid conditions. In a Microgrid with Genset and other REUs, all Energy Units are considered as similar and have to share the grid management task. Use Cases 1: Island Grid Use Cases 2: Microgrid & Public Grid Use Cases 3: Microgrid with Genset / other REUs Use Cases 4: REU Service Page 15

16 Regenerative energy 3 Battery storage 5 Investment potential 9 Motion-to-Grid 11 Solutions battery storage 16 Example topology 22 Summary 24 Page 16

17 Overview: Battery storage units - solution: Implementation of battery storage Battery directly connected to DC link Possible if U BATT max < 750V U BATT min > 580V Page 17

18 Overview: Battery storage units - solution: Implementation of battery storage Battery directly connected to DC link (low battery voltage) The DC actuating range can be adjusted using an transformer. U BATT min < 580V U BATT min > 450V Page 18

19 Overview: Battery storage units - solution: Implementation of battery storage Battery directly connected to DC link (low battery voltage) The DC actuating range can be adjusted using an transformer. U BATT min < 750V U BATT min > 300V Page 19

20 Overview: Battery storage units - solution: Implementation of battery storage Battery connected to DC-DC converter (low battery voltage) Motor module must be selected by battery current. The motor module must be oversized by factor 2. U Batt max < 720V Page 20

21 Regenerative energy 3 Battery storage 5 Investment potential 9 Motion-to-Grid 11 Solutions battery storage 17 Example topology 21 Summary 24 Page 21

22 Topology islanding: Example: Solar Plant combined with Solar system Battery system - + Page 22

23 Regenerative energy 3 Battery storage 5 Investment potential 9 Motion-to-Grid 11 Solutions battery storage 17 Example topology 22 Summary 23 Page 23

24 Summary The increasing use of batteries as hourly and daily storage systems is fuelled by the advancing global megatrend of renewable energies. Industrialized countries, emerging economies and developing countries are generating growth in on-grid and off-grid applications for battery storage systems. Peak shifting Power grid back up Islanding power grid The modular solution based on SINAMICS S120 allows simple adaptation of the functionality to all use cases and ensures short time-to-market. Page 24

25 Thank you for your attention! Alexander Ott I DT MC RMC P 1 Frauenauracher Str Erlangen, Deutschland Phone: Cellular: alexander.ott@siemens.com siemens.com/answers D: \ WS \ 020.TeamSegmentsApplications \ TeamDocuments \ 500.Veranstaltungen_EXTERN \ 620.Taiwan_FINAL \ BATTERY_STORAGE \ GMC_QF_C2G_EN_V100_2014 Page 25