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Demonstration of PSAPAC: A Case Study on Its Application to Three-Gorges Power System

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... Computing some or more selected eigenvalues by MAM and AESOPS methods. Programs of PSAPAC-VSTAB VSTAB Capability to automatically determine, ... – PowerPoint PPT presentation

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Title: Demonstration of PSAPAC: A Case Study on Its Application to Three-Gorges Power System


1
Demonstration of PSAPAC A Case Study on Its
Application to Three-Gorges Power System
  • Zheng Yan
  • Center for Electrical Energy Systems
  • The University of Hong Kong

2
Why this Demonstration
  • Technical evaluations will be indispensable in
    investigating feasibility and performance of
    Northeast Asia power grid interconnection
  • Certain similarities between Northeast Asia power
    grid interconnection and Three Gorges project in
    China

3
Contents
  • Background
  • Procedures of investigating Three Gorges Power
    System by PSAPAC
  • Some specific results (comparison with BPA
    program)
  • A preliminary view of running PSAPAC

4
Background
  • 1. PSAPAC of EPRI, USA
  • The Power System Analysis PACkage, developed by
    Powertech Labs Inc., for the Electric Power
    Research Institute, USA, is a comprehensive
    suit of advanced computer programs for
    investigating power systems.

5
Background
  • Major Programs included in PSAPAC
  • IPFLOW (Interactive Power FLOW Program)
  • ETMSP (Extended Transient/Midterm Stability
    Program)
  • SSSP (Small Signal Stability Package)
  • VSTAB (Voltage STABility Analysis Program)
  • DIRECT 4.0 (A BCU based Direct Stability Analysis
    Program distributed in companion with PSAPAC)

6
Background
  • PSAPAC has great capability to perform power
    system analysis and has been widely used in
    America, Canada, and many other countries and
    districts.
  • PSAPAC was mainly designed and developed for
    North American systems.

7
Background
  • 2. Asian Power Systems
  • The Asian power system market is the fastest
    growing market in the world.
  • The Asian power systems have many different
    technical aspects from North American power
    systems.
  • Application of PSAPAC to Asian systems needs
    investigation.

8
Background
  • 3. EPRI Contract with HKU
  • In order to introduce PSAPAC to Asia, an EPRI
    project contract WO4557-02 has been signed by
    EPRI with CEES (Center for Electrical Energy
    Systems of the University of HK) to conduct the
    feasibility study.
  • PSAPAC installed in workstations of CEES at HKU
    for this project.

9
Background
  • Applying PSAPAC to East-China power system and
    the Three Gorges power system had been conducted
    in co-operation with Chinese EPRI. And results
    are comparable with PSS/E and BPA programs.
  • Some results on Three Gorges Power System will be
    reported in this demonstration.

10
Three Gorges Power System
  • Three Gorges Power System consists of
  • 1. East China Power System Shanghai, Jiangsu,
    Zhejiang, Anhui
  • 2. Central China Power System
  • Hubei, Hunan, Jiangxi, Henan
  • 3. Sichuan Power System

11
Three Gorges Power system
  • Three Gorges Hydro Power Station
  • Three Gorges Project on the Yangtze River bagan
    to be built on Oct. 14, 1994.
  • The dam of the Three Gorges Project is located in
    Yichang county of Hubei province, 40 km north of
    Gezhouba dam.
  • Dam height 185m Normal water level 175m.
  • In Three Gorges Hydro Station (TGHS), there will
    be total 26 units of generators.

12
Three Gorges Power system
  • By the year 2003, the first generator unit will
    be put into operation.
  • By 2010, all the 26 units would be ready to
    generate electricity.
  • The rated capacity of a single unit is 700MW and
    the total capacity of the station is 18200MW.
  • Electricity production 84.7TWh per year.
  • Three Gorges Project is the biggest water
    conservancy project in the world.

13
Three Gorges Power system
  • Major transmission Projects in Three gorges power
    system
  • 1. From Three Gorges Hydro Station to East
  • China power system
  • Transmission distance 1000 km
  • Normal transmission power 7200 MW
  • HVDC Transmission line 500kV

14
Three Gorges Power system
  • 2. From Three Gorges Hydro Station to
  • Central China power system
  • Transmission distance 600 km
  • Normal transmission power 2000 MW
  • AC Transmission lines 500kV

15
Programs of PSAPAC-IPFLOW
  • IPFLOW
  • Interactive Power Flow Program for solving power
    flow equations.
  • For power equilibrium
  • For static security
  • u is vector of control variables (generator
    voltages and real power generations).
  • x is vector of state variables (load voltages).

16
Programs of PSAPAC-IPFLOW
  • Algorithms
  • Newton method
  • BX version fast decoupled power flow
  • XB version fast decoupled power flow
  • Automatic solution
  • DC power flow

17
Programs of PSAPAC-ETMSP
  • ETMSP
  • Extended transient/midterm stability program
    studies the stability of the system after a large
    disturbance. Solving two sets of
    differential-algebraic equations.

18
Programs of PSAPAC-ETMSP
  • DAE systems to be solved
  • For fault-on system
  • For post-fault system

19
Programs of PSAPAC-ETMSP
  • Major Algorithms
  • Fourth order Runge-Kutta method
  • Fourth order Gill-Runge-Kutta method
  • Implicit trapezoidal method

20
Programs of PSAPAC-ETMSP
An example of unstable case
21
Programs of PSAPAC-ETMSP
  • An example of stable case

22
Programs of PSAPAC-SSSP
  • SSSP
  • Small signal stability program studies the
    systems stability in the equilibrium point.

23
Programs of PSAPAC-SSSP
  • Form linearized DAE system around current
    equilibrium point
  • Compute the eigenvalues of matrix

24
Programs of PSAPAC-SSSP
  • Major algorithms
  • MASS (Multi-Area Small Signal Stability Program)
    Computing all eigenvalues by QR decomposition
    algorithm.
  • PEALS (Program for Eigenvalue Analysis of Large
    Systems) Computing some or more selected
    eigenvalues by MAM and AESOPS methods.

25
Programs of PSAPAC-VSTAB
  • VSTAB
  • Capability to automatically determine, from a
    given operating condition, the nearest point of
    instability, or maximum loading point.

26
Programs of PSAPAC-VSTAB
27
Programs of PSAPAC-VSTAB
  • Algorithm
  • Continuation power flow

28
DIRECT4.0
  • DIRECT4.0 - Direct method for transient stability
    assessment
  • To calculate the controlling UEP relevant to a
    given fault for stability assessment.
  • Program developed by Empros for EPRI
  • Fast Avoiding time-consuming integration
  • Energy margin An index to reflect the degree of
    stability or instability.

29
DIRECT4.0
  • BCU method (Invented by Felix F. Wu, H.D. Chiang,
    P.Varaiya)
  • A Boundary-Based Controlling Unstable Equilibrium
    Point method
  • Calculating the Controlling UEP through a
    reduced-state gradient system
  • BCU method is currently the only method used in
    DIRECT4.0

30
Procedures of Investigation
  • Data collection
  • System reduction
  • Creation of User Defined Controls for devices
    which are not included in PSAPAC
  • Study of cases with major concerns
  • Comparison of results with other programs
  • Suggestions

31
Data collection and system reduction
  • 1. Data collection and system reduction
  • Central China power system Hubei, Henan, Hunan
    and Jiangxi provincial power systems
  • East China power system Anhui, Jiangsu, Shanghai
    and Zhejiang provincial power systems
  • Sichuan power system
  • The purpose of network reduction is to focus on
    the most interested components of the system.

32
Data collection and system reduction
  • 2. The Simplified Network (Year 2005 peak)
  • Total 21 equivalent generators in TGPS. Among
    these generators, 12 generators locate in Central
    China and Sichuan System, 9 in East China.
  • 71 AC buses.
  • 57 500kV transmission lines.
  • 36 transformers.
  • 2 HVDC transmission lines.

33
Data collection and system reduction
East China Number of Generators 9 Number of Bus
30 No. of Zones 4 (Shanghai, Jiangsu, Anhui,
Zhejiang) HVDC converters locate at the Shanghai
and Anhui zones (SSZD and NAQD)
34
Data collection and system reduction
35
Data collection and system reduction
  • Central China
  • Number of Generators 12
  • Number of Bus 41
  • No. of Zones 5 (Hubei, Hunan, Jiangxi, Sichuan,
    Henan)
  • HVDC converters locate both at the Hubei zone
    (SAZD and GZBD)

36
Data collection and system reduction
37
Three Gorges Power system
38
User Defined Controls
  • 3. User Defined Controls
  • For implementing advanced power system
    components, HVDC converters and controls, so that
    PSAPAC can handle models not included in the
    program

39
Individual Phase Control (IPF) HVDC model
40
IPFLOW Results
41
IPFLOW Results
42
ETMSP Results
BPA Results
ETMSP Results
43
ETMSP Results
BPA Results
ETMSP Results
44
Some Comments
  • IPFLOW and BPA power flow program have the same
    calculation results in engineering accuracy.
  • ETMSP and BPA transient stability program also
    have comparable computation results in
    engineering accuracy.

45
Some Comments
  • ETMSP has strong modeling capability and is also
    convenient to perform hybrid AC/DC power system
    transient simulations.
  • The UDC part of the HVDC model are very flexible.
  • PSAPAC can be applied to Chinese power systems.

46
Some Suggestions
  • PSAPAC Requires Improvements in the following
    aspects
  • User-friendly interface
  • Unified database management
  • Graphic output
  • Network diagram display.

47
Some Suggestions
  • We found that the time step of ETMSP should be at
    least 10 times smaller than BPA in order to get
    the same precision in the case of hybrid ac/dc
    system. Enhancement of HVDC model and improvement
    of integration algorithms can be carried on.
  • The command line user interface is inconvenient
    to use. Windows-based interface should be
    developed.

48
Demonstration
49
Demonstration
  • Case 1 fd4hd1 / fault in East China system
  • Case 2 fd4hd2 / fault in East China system
  • Case 3 fd4hz1 / fault in Central China system
  • Case 4 fd4hz2 / fault in Central China system
  • Case 5 fd4hz3 / fault in Central China system
  • Case 6 Direct4.0 stable case for 161-machine
    system
  • Case 7 Direct4.0 unstable case for 163-machine
    system

50
Final Conclusions
  • Technical issues arising from interconnection of
    Northeast Asia power grids are very complex, and
    definitely more complicated than the Three Gorges
    power system.
  • Suitable software tools are playing extremely
    important roles in studying the Northeast Asian
    power grid, and be helpful to understanding the
    characteristics of the system.

51
Final Conclusions
  • We believe that, at different stages of the
    system development, different software tools with
    different degrees of complexities and
    capabilities can be used for investigation.
  • This presentation is just a Case Study, it does
    not have any intention to proposing PSAPAC as the
    only tool.

52
Thanks!
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