Smart%20Grid%20Protection%20in%20China - PowerPoint PPT Presentation

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Smart%20Grid%20Protection%20in%20China

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Smart Grid Protection in China Wu Guopei Guangzhou Power Supply Bureau Guangdong Power Grid, China – PowerPoint PPT presentation

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Title: Smart%20Grid%20Protection%20in%20China


1
Smart Grid Protection in China
Wu Guopei Guangzhou Power Supply Bureau Guangdong
Power Grid, China
2
Contents
  • Smart grid in China and the challenge for
    protection
  • Change from relay protection to grid protection
  • Concept of grid protection system
  • Reach of grid protection
  • Case study

3
Smart Grid in China
  • China is speeding up the infrastructure of smart
    grid
  • Main characteristics of Smart grid
  • self-healing and adaptive
  • safe, stable and reliable
  • fine compatibility
  • high quality and efficiency
  • coordinated and economic
  • friendly interaction with the users

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4
New Challenges for Smart Grid Protection
  • Adaptive
  • Flexible topology structure
  • Connection with distributed generators
  • Self-healing
  • Preventive control under normal operation
    condition
  • Automatically recover to normal state with
    minimum manual intervention

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5
Change from relay protection to grid protection
  • Three-defense line for the safety of power system
  • First defense line Conventional relay protection
  • To safeguard power system stable operation by
    fast and selective tripping of fault elements.

6
Change from relay protection to grid protection
  • Second defense linePower stability control
    system
  • To avoid system out-of-step by applying load
    shedding and generator shutdown according to
    pre-set control tactic.

7
Change from relay protection to grid protection
  • Third defense lineemergency control
  • Designed to prevent from system collapse and
    large area blackout using out-of-step islanding
    and frequency voltage control.

8
Concept of grid protection
  • Possibility grid protection
  • Development of information and storage technology
    eliminates the information isolated island in
    power system.
  • Safe and realtime information exchange
  • Extension from substation domain information
    interaction to power grid wide area information
    interaction.

9
Concept of grid protection
  • Goal
  • Realize integrated and optimized protection and
    control tactic instead of isolated three-defense
    line protection system

10
Research of grid protection
  • Optimized protection performance
  • Limit of conventional protective relay The
    selectivity of protective relays, especially back
    up protective relays, are dependent on the
    current, impedance and time settings, which may
    cause operation time delay and loss of
    selectivity.
  • Accurate fault locate and precise fault isolation
    can be achieved by using wide area fault
    distinguishing information at each node.

11
Research of grid protection
  • Fast power recovery in regional power grid
  • When the substation is loss of power due to power
    supplies out-of-service, the power supply in
    other substations will be connected according to
    system operation mode and topology state.

12
Research of grid protection
  • Improve the safety and reliability of
    distribution network after power recovery
  • Overload caused by power recovery may affect the
    power grid reliable operation
  • Load shedding shall be adopted to ensure the
    power supply to important consumers.
  • Acquire pre-fault static load information through
    the wide area information interaction with EMS,
    and optimize load shedding strategy to maximally
    protect reliable power supply.

13
Research of grid protection
  • Improve the safety and reliability of
    distribution network with distributed power
    supply
  • When distributed power supplies are connected to
    distribution network, the conventional relay
    setting regulations can not meet the requirements
    of system selectivity.
  • The electrical character are varying according to
    the type of distributed power supplies during
    system fault and grid interconnection.
  • Fast and precise fault locate and fault tripping
    using wide area measurement data
  • Check if the distributed power supply can
    restored to interconnection or isolated island
    state after fault is cleared, and ensure the safe
    and reliable operation of distribution network by
    applying grid interconnection control and load
    shedding.

14
Case study Grid protection distribution network
in China Southern Grid
  • Located in financial high-tech service area of
    Guangdong
  • Includes 2 substations, 65 kilometers
    distribution lines, 58 switch room ring main
  • Build distributed Intelligent Self-Healing
    Control System Based on Multi-Agent
  • The goals average fault outage time 5.2min/year

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15
Implementation of Grid protection
  • Taking into account the real-time performance of
    feeder automation devices (FA) and information
    completeness of distribution automation system
    (DMS), to raise the smart level of real-time
    control.
  • Distribution terminals with enhanced functions
    will be used as agents of grid protection and
    control system, to realize local signal
    acquisition pre-treatment, logic determination
    and implementation of remote commands.

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16
Implementation of Grid protection
  • Embedded central control stations with rapid
    information processing ability will be set up,
    for fault criteria logic calculation based on
    wide-area information, to realize rapid fault
    location.
  • System configuration tool shall be provided with
    graphic interface to realize system configuration
    for IEDs of smart distribution network protection.

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17
Implementation of Grid protection
  • Wide-area information protection logics such as
    improved directional pilot protection suitable
    for distribution grid will be used, to
    effectively determine distribution grid fault
    zone connected with distributed power source at
    load terminals.

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18
Implementation of Grid protection
  • Realize power restoration path selection function
    based on grid topology, assisted with load
    control technologies such as LF load
    disconnection, to realize rapid load restoration
    and load optimization and re-distribution.
  • Micro-grid frequency and load control technology
    with multi-DG access will be tried, for
    distribution grid multi-DG coordination control
    in island operation.

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19
Thank you for your attention !
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