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Wide area SPS for Integrating SR with national grid

Wide area SPS for Integrating SR with national grid. Approach Document prepared by. Indian grid. Problems that might arise. Transmission of system events to SR regions New congested transmission corridors Load encroachments and power swing

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Wide area SPS for Integrating SR with national grid

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  1. Wide area SPS for Integrating SR with national grid Approach Document prepared by

  2. Indian grid

  3. Problems that might arise • Transmission of system events to SR regions • New congested transmission corridors • Load encroachments and power swing • Protection malfunction(Zone-3 philosophy may fire back) • Inadequate reactive power compensation at right node may leading to voltage collapse • Local SPS may be inadequate during remedial actions • Island from WR on instability to safeguard SR

  4. Possibilities remedial or preventive • Redirect power flows by HVDC ramping • Ensuring primary frequency response from generators • PSS tuning for power swings • TCSC, SVC for reactive power compensation • Supervisory control on Zone-3 protection • Tripping • Integrate existing schemes for control actions

  5. Solution Enhanced situational awareness based on PMU + Applications(OMS, VSM) Online power system network evaluation TSA for contingencies Centralized RAS Controller Logic building, Arming, Triggering from SRLDC

  6. Proposed SolutionCentralized RAS

  7. Proposed System architecture Historian PDC Visualization & Reports SPS User interface eDNA Historian Adapter IEC 61850 C-37.118 PDC Telecom Network Telecom Network Tables,Triggers,GOOSE Sync 2101 PMU PMU Sync 2101 Sync2101 Sync 2101 Substation-03 Substation-04 Open Command & Over ride signal to IED Substation-01 Substation-02 Open Command & Over ride signal to IED (Breaker status UFLS,UV etc) (Breaker status UFLS,UV etc) G G G

  8. DATA from SCADA (Status,MW.MVAr,V,I) Verify the results with boundary condition and rank SPS action table based on no. of violation and severity Model Power flow engine(Simulate Events and evaluate each SPS action tables) Power Apps(power flow data base) Data from eDNA (Angle,V,MW,MVAr,Hz) Improved State estimation using Phasor data High & Low Limits (Angle,V,MW,MVAr,Hz) Boundary limits (Voltage,angle,MW.MVAr,I,Hz, angle) Triggers & Events (network tie line trippings-1-5, Over loading , Oscillations) Transient Analysis engine(For all events) SPS tables (Set1,Set2,Set3)

  9. SPS action evaluation

  10. Output of analysis

  11. Centralized trigger generation PMU-1 PDC with logic builder Analog data C-37.118 Logic Builder (PMU1.Angle-PMU2.Angle) Angular instability triggers PMU-2 Analog data PMU-n IEC-61850 client Logic Builder RTU1.Status & RTU2.Stat Multiple transmission line trip IEC61850 Goose trigger manger Analog data RTU-3 Sync2101 RTU-2 Sync2101 RTU-1 (Sync2101) SPS-local SPS-local SPS-local Status change SPS Selection SPS Selection SPS Selection

  12. SPS scheme interface (Sync 2101) Trigger external Status change Sync 2101(Trig manger node) SPS action-01 SPS action-02 SPS action-03 SPS action-04 Status Change Inputs/external trigger SPS RTU(existing)

  13. Approach • System events and severity analysis (eg: interconnection failure, interconnecting transmission overloading, power import, export, contingency ranking, voltage critical buses, VP-VQ curves. • System study for identifying subsets of the network which can maintain under disturbance. Done through load flow studies, transient stability analysis, voltage stability analysis using state estimation output and pre-defined contingency set. • Analyzing communication requirement. • Utilizing PMU data for better islanding & state estimation. • On line contingency evaluation using power system tools for deriving remedial actions.

  14. As is Study • Data collection: Details of Generating stations & substations with in the area. • Collection of the state estimation outputs in IEEE format for several possible operating scenarios, peak load, light load, summer load, winter load etc. • Identification of sustainable operational areas with in SRLDC. • Identification of operational subsets (load pattern and generation availability) • Identifying number of substations & feeder to be involved in system operation. • Communication medium and latency analysis. • Contingency study involving load flow, static contingency, dynamic contingency, voltage stability, OPF solutions. • Islanding scheme derivation(UF,UV,df/dt,dv/dt) . [done through transient stability analysis based on state estimation outputs and specified contingencies] • Utilizing PMU data for analysis [Done through enhanced state estimation, valid only if there are significant measurements from PMU]

  15. List of use cases/contingencies • Centralized operation • Centralized manual trigger(Operator driven) • Transmission line overloading(PMU based) • Islanding (Manual/OMS trigger) • Automatic • Line trips, Gen trips(Breaker trips) • SPS specific backup Protection trip (UF/OF,OV/UV)

  16. Centralised SPS for flow control with WR Flow control with WR HVDC Asynchronous link Synchronous link PMUs

  17. SPS for individual transmission lines PMU data sets available PMUs

  18. Path Dynamics for better understanding of the system External pool Internal pool PMUs Relays available for pilot

  19. SPS for flow gates • Major transmission • line corridors(inter states) • Nellore –Alamanti • chittor – sriperumbatore • Kolar-klvdpt • Somnahalli –salem • Kolar - Hosur  1&2 AP KAR TN Power flow PMUs

  20. Challenges • Modeling of the network • Integrating with existing SCADA system for real-time measurements • Faster communication medium • Simultaneous action of through out the geography (execution of commands in same time) • Transmission of GOOSE over WAN

  21. KALKITECH’s experience • Cell controller project For energynet.dk -Denmark(the project includes islanding and load balancing automatically during contingencies, this includes powerplants,CHPs & wind turbines) • Emergency control schemes for Power intensive metal industries, refineries and petrochemical industries(800 to 400 MW plants to be stabilized during grid failures while power import & exports,schems includes, fast load shed and gen shed and synchronization controls) • EMS for Bhutan Power Corporation (Network Topology Processor, Load Flow, Short Circuit Studies, Transient Stability Studies with Power Apps ) • PMU based WAMS Pilot Project at SRLDC • Working on PGCIL NTAMC project for RAS and AFAS • We were consultants for Qatar Petroleum for HV SCADA implementation with IEC61850 SAS for their 33 kV distribution network • Development experience on OMS and VSM with WSU • Partnership With eDNA on Time-Series Historian • Participation in NASPI / IEEE

  22. Advantage of KALKITECH Centralized RAS • Experience in power system dynamics and islanding implementation • In House PDC / WAMS/SPS Application Expertise, both in Power System Algorithms, Communication Systems and Protocols. • Rugged and versatile RTU (Sync 2101)for data acquisition and control action • Strong Integration and Inter-Operability Experience • Strong R&D and Product Partnerships with IIT Mumbai, WSU and Time Series Historian Companies. • Open Interface for application / visualization / analytics development • Distributed & Scalable architecture, with a centralized web-based Visualization server and a Distributed PDC structure

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