Petition No. 137/MP/2012. Case: Chhattisgarh State Power Generation Company Ltd. Vs Western Regional Load Despatch Centre, Mumbai. Central Electricity Regulatory Commission

Case Number:Petition No. 137/MP/2012
Party Name:Chhattisgarh State Power Generation Company Ltd. Vs Western Regional Load Despatch Centre, Mumbai
Judges:Dr. Pramod Deo, Chairperson, Shri S. Jayaraman, Member, Shri V.S. Verma, Member and Shri M. Deena Dayalan, Member
Issue:Electricity Law
Judgement Date:September 25, 2012
Court:Central Electricity Regulatory Commission
 
FREE EXCERPT

Order:

(New Delhi)

  1. This petition has been filed by the Chhattisgarh State Power Generation

    Company Ltd, for extension of time for putting the generators of Hasdeo Thermal

    Power Station (HTPS) in Restricted Governor Mode of Operation (RGMO) up to year

    2014-15 and for permission to run Hasdeo Bango Hydel Power Station (HBHPS) on

    Free Governor Mode of Operation till commissioning of new software based EHG

    system, under Regulation 5.2 (f) of the Central Electricity Regulatory

    Commission (Indian Electricity Grid Code) Regulations, 2010 (hereinafter referred

    "Grid Code").

    Background

    Regulation 5.2.(f) of the Central Electricity Regulatory Commission (Indian

    Electricity Grid Code) Regulations, 2010 (hereinafter referred "Grid

    Code") provides as under:-

    Governor Action

    (i) Following Thermal and hydro (except those with up to three hours

    pondage) generating units shall be operated under restricted governor mode of

    operation with effect from the date given below:

    (

    1. Thermal generating units of 200 MW and above,

      (1) Software based Electro Hydraulic Governor (EHG) system: 1.8.2010

      (2) Hardware based EHG system: 1.8.2010

      (b) Hydro units of 10 MW and above: 1.8.2010

      (ii) The restricted governor mode of operation shall essentially have the

      following features:

      (

    2. There should not be any reduction in generation in case of improvement

      in grid frequency below 50.2 Hz. (for example if grid frequency changes from

      49.3 to 49.4 Hz. then there shall not be any reduction in generation). Whereas

      for any fall in grid frequency, generation from the unit should increase by 5%

      limited to 105 % of the MCR of the unit subject to machine capability.

      (b) Ripple filter of +/- 0.03 Hz. shall be provided so that small changes in

      frequency are ignored for load correction, in order to prevent governor

      hunting.

      (c) If any of these generating units is required to be operated without its

      governor in operation as specified above, the RLDC shall be immediately advised

      about the reason and duration of such operation. All governors shall have a

      droop setting of between 3% and 6%.

      (d) After stabilisation of frequency around 50 Hz, the CERC may review the

      above provision regarding the restricted governor mode of operation and free

      governor mode of operation may be introduced.

      (iii) All other generating units including the pondage up to 3 hours Gas

      turbine/Combined Cycle Power Plants, wind and solar generators and Nuclear

      Power Stations shall be exempted from Sections 5.2 (f), 5.2...

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