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Establishment and Functioning
*      For optimum energy management, system control and better services to consumers, it was decided to set up an SLDC (State Load Despatch Centre) based on real time modern computers with facilities of dedicated communication, SCADA (Supervisory Control And Data Acquisition)/EMS (Energy Management System) and displays etc.
*      Accordingly, a DPR (Detailed Project Report) was framed for SLDC in 8/1979 for an estimated project cost of Rs. 6.08 Crores and techno-economical approval of the same was accorded by CEA (Central Electricity Authority) during 8/1980.
*      The project could not be implemented because of non-finalization of FRS (Functional Requirement Specifications) at that time and subsequently it was decided to incorporate the SLDC requirement with integrated operation of Northern Region Power System.
*      Keeping in view the arrangement of funds from World Bank through some central agency and also to ensure compatibility of equipments, M/s Power Grid was entrusted the implementation of Unified Scheme.
*      The establishment of Unified Scheme for NRLDC ( Northern Region Load Despatch Centre) & SLDC ( State Load Despatch Centre) in Northern Region has following constituents :
            (I)   BBMB   (ii)   PSEB   (iii)   RSEB now RRVPN   (iv)   HPSEB  
(V)   J&K PDD   (vi)   DVB now DTL (vii) NHPC   (viii)   NTPC  
(vi)   UPSEB now UPPCL & UPCL   (x)   HSEB now HVPN.
*      The ULDC scheme was conceived and implemented in all state of northern region by the Powergrid.
*      The funds for the ULDC project was arranged by Powergrid from the World Bank and the tentative cost of the project was 500 Crores of rupees, out of which cost share of Haryana was approximately 34 Crores
*      In Haryana SLDC/Sub_LDCs were commissioned during January, 2002 along with :-
  •     1 RSCC, 7 SLDCs, and 22 Sub _ LDCs
  •       of NR constituents State
Functioning of State Load Despatch Centre
(As per Indian electricity act,2003 section 32)
*      1. The State Load Despatch Centre shall be apex body to ensure integrated operation of the power system in a state.
*      2. The State Load Despatch Centre shall:
      (a) Be responsible for optimum scheduling and despatch of electricity within a State, in cordance
           with the Contracts entered into with the licensees or the generating Companies operating
           in the State.
        (b) Monitor grid operation ;
        (c) Keep accounts of the quantity of electricity transmitted through the state grid ;
        (d) Exercise supervision and control over the intra-state transmission system ; and
       (e) Be responsible for carrying out real time operation for * grid control and despatch of 
            electricity within the state through secure and economic operation of the state grid in 
            accordance with the grid standards and the state grid code.
*      3. The state load despatch centre may levy and collect such fee and charges from the generating companies and licensees engaged in intra-state transmission of electricity as may be specified by the state commission.
*      4. Compliance of Direction (As per I.E.A 2003, Section-29, Para-1)
The Regional load despatch centre may give such directions and exercise such supervision and control as may be required for ensuring stability of grid operation and for achieving the maximum economy and efficiency in the operation of the power system in the region under its control.
Control System Hierarchy For Northern Region
The control hierarchy for the SCADA/EMS system of the northern region is illustrated below. All data exchange takes place along the logical part as shown, e.g. no direct communication takes place between SLDCs, between Sub-LDCs, or between the Sub-LDC in one state and SLDC in another state.
The three tier-hierarchal levels are summarized as follows:
  •  Level 1:
            This level is based on the RSCC.RSCC is the Regional System Control and Coordination Center and is responsible for the Central Sector transmission system and for allocating Central Sector generation, regional coordination and control is based on data obtained from RTUs directly as well as on data exchange with underlying SLDCs and the CPCC.

  •    Level 2:
              This level includes SLDCs AND the CPCC. Each SLDC (State Load Dispatch Center) is responsible for its state owned power system (BBMB acting for 4 states). The SLDC collect data directly from RTUs and indirectly via data exchange with its SUB-LDCs. The CPCC is responsible for central sector power system elements with its own area, collecting and monitoring data from RTUs.
  •   Level 3:
               This level includes SUB-LDCs and each is responsible for a specific area of its state owned power system. They acquire data from RTUs and exchange data with their related SLDC.
  The data displayed is for general information of Public/Government/Other Users. HVPNL shall not be responsible for any discrepancy in the data. Please contact Chief Engineer Administration, Shakti Bhawan, Sector-6, Panchkula, for further information.  
  Triggered by :: TRIGMA © 2008