IEGC

collapse of NE Grid




OBJECTIVE
CONSTITUTION
ERPC MEMBER
FUNCTION
SECRETARIAT

OBJECTIVE

To facilitate integrated operation of power system in Eastern Region.

CONSTITUTION

Govt. of India vide its resolution F. No. 23/1/2004-R&R dated 29th November 2005 had established Eastern Regional Power Committee comprising the states of Bihar, Jharkhand, Orissa, West Bengal and Sikkim with following members:-
Member (Grid Operations), Central Electricity Authority (CEA)
One representative each of Central Generating Companies, Central Transmission Utility (CTU), National Load Despatch Centre and the Eastern Regional Load Despatch Centre (ERLDC)
From each of the states in the region, the State Generating Company, State Transmission Utility (STU), State Load Despatch Centre (SLDC) and one Distribution Company by rotation (where more than one such company exists) would be represented.
Every independent power producer (IPP) having more than 1000 MW installed capacity in the region would have one representative each.
One member representing all other IPPs operating in the region.
One member representing the electricity traders in the region.
Member Secretary, ERPC ------ Convenor

5
Besides, the ERPC Secretariat performs the following duties namely:
Keep custody of records of proceedings of the Committee, sub-committees, task force and working groups of the ERPC.
Prepare agenda for the Committee and Sub-Committee meetings.
Prepare minutes of Committee and Sub-Committee meetings.
Take follow-up action on the decision taken in the Committee & Sub-Committee meetings.
Maintain archive of data and information pertaining to operating parameters, protection system and communication system of the regional power system.
Collect from constituent members or other offices, companies, firms or any other party as may be directed by Committee, such information as may be considered useful for the efficient discharge of functions of the Committee under the Resolution and place the information before the Committee and its sub-committees.


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GRID MANAGEMENT



Page 2
Table of Contents
1
OVERVIEW........................................................................................................................................ 7
2
EXISTING POWER SYSTEM AND LOAD DESPATCH FACILITY........................................... 13
3
SYSTEM DEMAND AND CONTROL............................................................................................ 16
4
CURRENT BLACK START AND SYSTEM RESTORATION PROCEDURES........................... 18
5
EXISTING ISLANDING SCHEMES............................................................................................... 26
6
DEMAND ESTIMATION AND CONTROL................................................................................... 34
7
NETWORK SECURITY AND SYSTEM OPERATION................................................................. 37
8
OUTAGE PLANNING...................................................................................................................... 44
9
SCHEDULING AND DESPATCH PROCEDURE.......................................................................... 47
10
GRID DISTURBANCES AND REVIVAL................................................................................... 55
11
ISLANDING SCHEMES...............................................................................................................59
12
ENERGY ACCOUNT AND SETTLEMENT SYSTEM .............................................................. 62
13
EVENT INFORMATION AND REPORTING............................................................................. 64
14
MANAGEMENT OF LOAD DESPATCH & SYSTEM OPERATION CODE........................... 68
ANNEXURES
FUNCTIONS OF SLDC as per Indian Electricity Act
(i)
State Load Despatch Centre in a State subject to the provisions of the sub-section 55(3)
of the Act, may give such directions and exercise such supervision and control as may
be required for ensuring the integrated grid operations and for achieving the maximum
economy and efficiency in the operation of the power system in that State.
(ii)
All directions issued by the Regional Load Despatch Centre to any transmission licensee
of the State Transmission lines or any other licensee of the State or generating company
(other than those connected to inter-state transmission system) or sub-station in the
State shall be issued through the State Load Despatch Centre (SLDC) and the State
Load Despatch & System Operation Code
8
Page 9
Load Despatch Centre shall ensure that such directions are duly complied by the
transmission licensee or licensee or generating company or sub-station.
(iii)
The regional Load Despatch Centre or State Load Despatch Centre, as the case may be
shall enforce the decision of the Regional Electricity Board.
1.3.1 SLDC Functions & Responsibility
The following are contemplated as principal functions of the SLDC:
Liaison with the State Generating Units, Distribution Companies, IPP, CPP and NRLDC
and other in matters related with operation of State Transmission System.
Collection of data related with system operations, interchange and exchange of energy.
Clause 2.6 of IEGC.
Load Despatch & System Operation Code
9
Page 10
(ii)
Except where specific provisions made in IEGC, the operation of SLDC is governed by
Grid Code (Part-I _General & Planning Code) and this Load Despatch & System
Operation Code(Part-II of Grid Code).
(iii)
As a constituent of the Northern Region the Connection Conditions specified in Chapter-
4 of IEGC applies to RVPN and relevant extract of the IEGC Connection Conditions is
placed at Annexure-1.3.
(iv)
All generating units, which are synchronized with the grid, irrespective of their
ownership, type and size, shall have their governors in normal operation at all times. If
any generating unit of over fifty (50) MW size is required to be operated without its
governor in normal operation, the NRLDC shall be immediately advised about the
reason and duration of such operation. All governors shall have a droop of between 3%
and 6%. The exemption from free governor mode operation in respect of any generating
stations shall be sought from CERC under clause 1.6 of IEGC. Such petitions for
exemption
shall
be
preceded
by
study
preferably
by
CEA.
(v)
Under Clause 6.1 (e) of IEGC, Control Rooms of NRLDC, all SLDC, power plants & EHV
(33 KV & above) substations and any other control centres of regional constituents are
to be manned round the clock by qualified and adequately trained personnel.
(vi)
Following chapters of IEGC set out the demarcation of responsibilities between NRLDC
& SLDC and role of SLDC:
Chapter 4
-
adding this
forecasted requirement for each state with a weight age corresponding to
percentage entitlement of the state in the ISGS hydro station. This interim
schedule would be rounded off to the nearest feasible MW for the ISGS hydro
station to get the final schedule of the ISGS hydro station. With this procedure,
Load Despatch & System Operation Code
52
Page 53
the generation schedule would adequately reflect the weightage according to
MW demand of each beneficiary in the ISGS hydro station
9.10.2 The entitlement for each beneficiary would then be worked out by NRLDC
based on such interstate hydro generating station schedule and percentage
entitlement of the beneficiary. The above general procedure will be followed
except in case of extremely low water inflows, when the hydro stations would
be scheduled for operation only during the peak hours.
9.11 Allocation of un-requisitioned surpluses
9.11.1 In line with section 5.7.3 of the CERC's orders on ABT, each ISGS could
negotiate the terms with any beneficiary for such un-requisitioned power on
day-to-day basis. A copy of all such agreements would be made available to
NRLDC and NREB Secretariat, and would be supplied to SLDC. In case SLDC
desires to avail full or part of such un-requisitioned surplus, such agreements
would get first priority in allocation of un-requisitioned surpluses at the terms
and conditions of the offer/agreement. In case of such surplus, requisitioned by
states, exceeds the availability; allocations to each state will be decided by
NRLDC/NREB Secretariat as per policy guidelines of NREB.
9.11.2 In respect of state sector power projects, SLDC shall evolve procedures for
best drawl schedules and scheduling of hydro stations and incorporate the
same as annexure to this Code.
9.12 Exchange of information
9.12.1 With the implementation of ABT, the generation schedules and drawls
schedules would have a bearing on payment to ISGS for the energy charge and
for unscheduled interchange. Therefore, the timely and accurate exchange of
information in regard to schedule is of paramount importance. This aspect
gains extra importance particularly in view of the CERC order of ABT dated
4.1.2000 wherein under schedule 1.0 it is stated that 'generation schedule and
drawl schedules issued/revised by NRLDC shall become effective from
designated time block irrespective of communication success'. In order to avoid
any adverse effect commercially on the state the need for a reliable and fast
communication arrangement for exchange of information in respect of
scheduling cannot be overemphasized.
9.12.2 Considering the large volume of information needed to be exchanged in a time
bound manner, the transfer of information between NRLDC and other
constituents i.e. states and ISGS, shall be preferably carried out on PC-to-PC
communication link through Internet / public switched telephone network
(PSTN).
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