DOE Peer Review - US Department of Energy 2008 Peer Review - ETO StatCom... DOE Peer Review ETO STATCOM

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  • DOE Peer Review

    ETO STATCOM Demonstration Project Update

    September 30, 2008

    Wayne Litzenberger-DesignTech Loren Anderson-BPA

  • Participants • DOE Energy Storage Program

    • Sandia National Lab

    • NCSU

    • EPRI

    • TVA

    • BPA

    • Florida State University‐Center for Advanced Power Systems

    • Tri‐State

    • AES‐SeaWest

    • Commercial Vendor ?

  • CONDON WIND FARM Proposed Host Site

  • Full Scale Demonstration Project

    • 10 MVA STATCOM with battery storage

    • Adjacent to Condon Wind Park

    • Mitsubishi Type 1 induction machines

    • Poor voltage regulation

    • Long line with many small customers

  • Proposed 10 MVA ETO STATCOM for Condon Wind Farm

    0.6886mH

    I=1400 A (RMS)

    with IEEE 519 standards

    ETO Voltage Source Converter

    (transformer leakage inductance)

    I=1400 A (RMS)

    with IEEE 519 standards

    69kv bus

  • Condon Windfarm Problems 1. Voltage regulation trouble– Loss of control

    over Inductive VAR compensation caps 2. Turbine main breaker trips and controller

    faults during 69kv undervoltage transient events

    3. Harmonic sink for 5th harmonic – overheating the local turbine compensation current limiting reactors.

    4. Megawatt output limited to 15MW on single ended feed.

  • 24 hrs Condon Wind 10/15/06

  • VQ sensitivity from FSU model

    -5 0 5 10 15 20 25 0.8

    0.85

    0.9

    0.95

    1

    1.05

    1.1

    1.15

    1.2

    Reactive Power inj/draw Q [MVAr]

    V ol

    ta ge

    a t C

    on do

    n [p

    u]

    VQ sensitivity at Condon Pcw = 0.0MW, Q inj at Fossil, Qcw = 0MVAr Pcw = 49.8MW, Q inj at Fossil, Qcw = -20MVAr Pcw = 0.0MW, -Q drawn at Condon Pcw = 49.8MW, -Q drawn at Condon

    0.4 % / MVAr

    0.35 % / MVAr

    0.7 % / MVAr

    1.0 % / MVAr

    0.65 % / MVAr

    1.2 % / MVAr

    0.45 % / MVAr

    0.7 % / MVAr

    0.1 % / MW

    0.07 % / MW

  • Analysis of Power Flow Results and SCADA Data

    WF…Wind Farm (at Substation)

    Leads into V-Collapse

    Strong evidence that malfunctioning of Condon Wind Farm capacitor switching causes the problem

  • ETO Thyristor STATCOM Demonstrate Emitter turn-off thyristor in a 5 level

    10MVA - stacked H bridge configuration

    Co-Fund = $276,658BPA = $499,995TOTAL FY07 = $776,653

    Contractor: North Carolina State University Principle investigator: Dr. Alex Huang – patent holder for ETO Thyristor

  • Power Smoothing via battery

  • 30 minute Power Ave

    100 200 300 400 500 600 700 800 900 1000 -10

    0

    10

    20

    30

    40

    time (H)

    P w g D ec 0 4

    24 26 28 30 32 34 36

    0

    5

    10

    15

    20

    25

    time (H)

    P w g D ec

    04

  • Smoothing performance index PI vs. energy storage size (MWh) for a time constant of

    one hour

    Smoothing Performance vs. Energy Storage Size

    1000 2000 3000 4000 5000 6000 7000 8000 9000

    10000 11000 12000 13000 14000 15000 16000

    0 5 10 15 20 25 30 35 40 45 50

    MWh

    M W

  • Converter Topology: Five Level CMC CMC = Cascaded Multilevel Converter

    Six ETO Light converters will be used

    Transformer Configuration

    Y to Delta Secondary

  • TESTING

    • Digital Controller – Testing at NCSU (finished) – Testing at FSU – Contract w/ EPRI

  • Central Controller

    DSP Processor (1)

    FPGA (3)

    Interface

    Scalable Modular Controller Architecture

    Control Room

    Converter Room

    PCI BUS

    ………………………………………………

  • CAPS Large-Scale High-Fidelity Transient Power System Simulation

    • Largest real-time digital simulator (RTDS) installation in any university, worldwide • Systems studies sized up to 250 three-phase buses at 50/2s time steps • High-speed analog I/O to enable realistic control and power HIL experiments • Additional off-line simulation tools, i.e.: EMTDC, Matlab, PSS/E • Established expertise in understanding the details of novel and legacy power

    system apparatus and their interaction with the system • Knowledge in system simulation methods, analysis, and interpretation of results

  • Controller Hardware in Loop (CHIL) and Power hardware in loop (PHIL)

    • Controller HIL Simulation – Controller under test – Low level transmitting signals (+/-15V, mA) – A/D and D/A converters are adequate for

    the interface

    Simulator D/A A/D

    A/D D/A Controller under Test

    Simulator D/A A/D

    A/D D/A Power Device

    under Test

    Power Interface

    • Power HIL Simulation – Power device (load, sink) under test – High level transmitting signals (kV, kA, MW) – Power amplifiers required for interface

  • 2.5 MW

    Testing of a 13.75 MVA STACOM in RTDS-PHIL Facility at CAPS

    =

    ~

    ~

    =

    STATCOM under test

    =

    ~

    =

    ~

    ~

    =

    Experimental 4.16 kV AC busUtility 4.16 kV bus

    2.5 MWSimulate Electric System Response

    Feedback Measured Data

    Real Time Simulator

    7.5 MVA

    12.47 kV 50 MVA 115 kV system City of Tallahassee

    Up to  13.75 MVAr

     6.25 MVAr 7.5 MVAr

     0

    Utility voltage reference for controls

    • Full power • Current & voltage

    regulation • Limited system and

    wind farm dynamics

    *) May require additional line reactors for filtering and current sharing

    Simulates electric power systems & controls in real time 14 racks  756 electrical nodes > 6000 control components Timer step (typical): t = 1.5…50s 400 digital and 200 analog I/O enable “real-world” feedback

    5 MW AC-DC-AC Converter

    “Amplifier”

    Reproduces simulated voltage waveforms: 4.16 kV nominal +20%/-100% 40- 65 Hz Harmonics up to 1.5 kHz E

    qu ip

    m en

    t m an

    uf ac

    tu re

    d, c

    om pl

    et e

    C om

    m is

    si on

    in g

    ex pe

    ct ed

    e ar

    ly 3

    Q 2

    00 7

  • ETO STATCOM Review

    • Curtiss Wright contract with Sandia NL

    • Assure conformance with utility needs

    • Review NCSU design

    • BPA contract for Expert Panel Review

  • Energy Storage – Sandia Labs

    • Lead Acid Batteries - Tom Hund Report • Flow Batteries • Vanadium Redox Batteries • SuperCapacitors

  • 3 Phase Step-down Transformer

  • Questions

  • Next Steps • Get FY08 BPA funding in place - $750k • Select Integrator and assemble STATCOM - 08 • STATCOM Testing in BPA LAB -08 • DOE Funding for Energy Storage $2M- 08 • Integrate Energy Storage into STATCOM - 08 • Test Combined System in Lab - 08 • Design STATCOM Substation -08 • Order Substation Materials – 08

    • Build Substation – 09 • Install STATCOM -09 • Commission STATCOM -09 • Integrate Wind Forcasting system into Energy Storage Control

    Algorithm – 09 or later