MANAGEMENT OF LOAD DISPATCH CENTERS RLDC’s MANAGEMENT

Territorial Jurisdiction: Five Regions In Country: Northern Southern Eastern Western North – Eastern

RLDC’s MANAGEMENT Operating Agency: -A Govt. Company or any Authority or Corporation established under Central Act. -Presently responsibility entrusted to : Central Transmission Utility - POWERGRID

RLDC’s MANAGEMENT Challenges: Frequent Grid Disturbances / Blackouts Wide Frequency / Voltage excursions Transmission Bottlenecks Sub-Optimal Operation Stressed Equipments and Operators

RLDC’s MANAGEMENT RLDC Responsibilities: -Efficient, Economical and Integrated transmission and supply of Electricity -Co-ordination of facilities for inter-state, regional and inter-regional generation and transmission of electricity -Apex body to ensure integrated operation of Power System in the concerned region

RLDC’s MANAGEMENT Co-ordination Functions: - Merit Order Operation - Resource Scheduling - Facilitating inter-state and inter-regional transactions - Transmission corridor usage allocation and loss optimization - Scheduling Co-ordination - Keeping accounts of electricity transmitted through regional grid

RLDC’s MANAGEMENT Real Time Functions: - System security and integrity - Facilitating inter-state and inter-regional spot trading - Load-Generation balance and maintenance of system parameters - State estimation and contingency evaluation - System contingency handling and revival

RLDC’s MANAGEMENT Real Time Operation : Strengths Simple, but effective tools Holistic approach rather than relying only on elaborate codified procedures Co-operative Culture Real Time Operation stands on two firm footings Real Time Operation stands on two firm footings IEGC – THE INDIAN ELECTRICITY GRID CODE IEGC – THE INDIAN ELECTRICITY GRID CODE ABT – AVAILABILITY BASED TARIFF ABT – AVAILABILITY BASED TARIFF

INDIAN ELECTRICITY GRID CODE (IEGC) SIMPLE, COMPREHENSIVE AND EFFECTIVE ADAPTIVE TO GRID REQUIREMENTS CLARITY IN ROLES OF STAKE HOLDERS Encompasses: -Planning Code for Inter State Transmission -Connection Conditions -Operating Code for Regional Grids -Scheduling and Dispatch Code -Management of Indian Electricity Grid Code RLDC’s MANAGEMENT

Availability Based Tariff A Rational Tariff Structure Complements Grid Reliability Encourage Those Who Help The Grid and Discourage Those Who Undermine Reliability Simple and Effective Scientific Settlement System on Weekly Basis RLDC’s MANAGEMENT

Availability Based Tariff : Price Mechanism Fixed Cost:Plant Availability Variable Cost:Schedule Energy Deviation:Unscheduled Interchange (UI) Attracting Frequency Linked Charges

FREQUENCY vs UI PRICE FREQUENCY PAISE/UNIT 49 HZ 50.5 HZ 49.5 HZ 50 HZ 49.5 HZ CORRESPONDS TO RS.4.00 UI PRICE AND FREQUENCY

The Power Of UI: Linked To Frequency – – Collectively Controlled, Democratically Stabilized – Known Online To All - Transparency Simple – No Elaborate Calculation Required No Fear Of Price Rigging No Need For Negotiating Promotes Discipline Strong Nash Equilibrium Dovetails With Loose Power Pools Philosophy Platform For A POWER MARKET RLDC’s MANAGEMENT

THE POWER OF UI (Contd.): UI Vector Sends The Signals For – Optimization In The Control Area – Realistic Load-Generation Planning – Trade, Bilateral and Contracts Indian Equivalent of The Spot and Balancing Market RLDC’s MANAGEMENT

GRID CONTINGENCIES AND SYSTEM RESTORATION

Power System Network: - Demarcation of Grids In India is on Regional basis - Maximum area which could be affected in the event of a disturbance is the whole region SYSTEM RESTORATION

Last Blackout In NR: - Date: 2 nd January System Affected: Whole Region (19,800 MW) - Time of Disturbance: 04:44 / Time of Restoration : 13:32 /

SYSTEM RESTORATION Last Blackout In WR: - Date: 30 th July System Affected: Whole Region except parts of Mumbai (21,500 MW) - Time of Disturbance: 20:11 / Time of Restoration : 19:00 /

SYSTEM RESTORATION Last Blackout In ER: - Date: 25 th July System Affected: Whole Region (7,300 MW) - Time of Disturbance: 21:11 / Time of Restoration : 07:00 /

SYSTEM RESTORATION Last Blackout In SR: - Date: 23 rd January System Affected: 50 % Area (10,000 MW) - Time of Disturbance: 12:49 / Time of Restoration : 19:56 /

Vital Elements: MEN EQUIPMENT PROCEDURE Preparedness of the three Vital Elements is the key for Successful Restoration SYSTEM RESTORATION

Regional Specific Procedures: A detailed Black Start procedure exists for each Region taking into consideration following Regional specific requirements: -Generation composition -Load Spread -Network Configuration -Black Start Avenues

SYSTEM RESTORATION Black Start Philosophy: -Simultaneous Revival from different corners -Agreed Norms for Inter-Regional assistance -Use of well identified Black Start Avenues -Priority to revival over any commercial aspects

SYSTEM RESTORATION Black Start Philosophy (Contd.): Empowerment Of System Operators Synergistic Confluence Of Procedures and Operator Judgment Right Person In Right Place Holistic Approach

SYSTEM RESTORATION Real Time Controls: -Identified priorities for load build-up -Load – Generation Balance -Redundancy Build – up -RLDC to act as Nodal agency

SYSTEM RESTORATION Reliability Criteria: -Mock exercises / Dry run tests -Workshops / Refresher courses on Black Start Procedures: A must for each grid operator -Wide circulation of Black Start Document -Review of System Restoration Procedure (Annual Feature)

Pitfalls To Avoid: Focus On Process Rather Than The Goal Pervasive Automation Commercial Transactions Overriding Reliability Issues Tight Control Of Parameters Complex Control Hierarchy – Everyone Is Connected – …………………..No One Is In Control SYSTEM RESTORATION

THANK YOU RLDC’s MANAGEMENT

Identified Priorities for Load Build-up -Start-up power to thermal units -Supply to Emergency Loads -Supply to Electric Traction -Supply to Strategic installations / areas

RLDC’s MANAGEMENT Load Generation Balance A continuous exercise is on to identify the actual generation build-up and the load is accordingly adjusted

RLDC’s MANAGEMENT Redundancy Build-up While building-up the network due care is also taken to build-up the backup path so that the whole restoration exercise is not jeopardized in the event of tripping of a transmission circuit(s)

RLDC’s MANAGEMENT RLDC as Nodal Agency Throughout the restoration procedure RLDCs act as the nodal agency so as to: -incorporate any deviations in real time in the event of any contingency -issues necessary instructions for fast build up of the system in real time -integrate the different built-up sub-systems

RLDC’s MANAGEMENT Simultaneous Revival From Different Corners For instance, for revival, Northern Region is demarcated into four sub-systems.

RLDC’s MANAGEMENT Agreed Norms for Inter-Regional Assistance During Black Start, assistance on Inter- Regional links is extended on priority

RLDC’s MANAGEMENT Black Start Avenues Hydro Thermal Gas Hydro Generating Units Gas Turbines Thermal Stations (close to sources of startup power) Hydro

RLDC’s MANAGEMENT Revival vis-à-vis Commercial Aspects During system disturbance and revival the restoration considerations get all importance commercial contracts get least priority / suspended

NORTHERN REGION AREA889,000 SQ. KMS. POPULATION307 MILLION PEAK DEMAND24,000 MW 480 MU / DAY STATES AFFECTEDPUNJAB, HARYANA, RAJASTHAN, DELHI, UP, J & K, UT CHANDIGARH RLDC LOCATIONNEW DELHI

SYSTEM RESTORATION SEQUENCE DETAILS

RESTORATION SEQUENCE ON (Western U.P.) 06:26Auraiya GPS GT#3 self started. 06:55220 kV Auraiya-Phaphund D/C charged to extend supply to Railway Traction. 07:43Auraiya GPS GT#1 Synchronised. 07:55Supply extended to Agra (tripped at 08:30 hrs) due to load generation imbalance. 10:29Supply again extended to Agra (Tripped at 10:48 hrs) due to load generation imbalance 11:00Auraiya GPS GT# 1 & GT#3 tripped on under frequency. 11:33Railway supply restored by charging 220 kV Auraiya- Phaphund line.

RESTORATION SEQUENCE ON (Eastern U.P.) 04:44Time of disturbance. 05:10Start-up extended to Singrauli from WR (over AC bypass link. 05:20Supply extended to Mugalsarai-Pahara section of Northern Railway from Bihar (ER) 05:58400 kV Singrauli-Rihand-I Charged to extend start-up to Rihand 06:15Supply extended to Pahara-Kanwar section of Northern Railway from 220 kV Allahabad sub-station. 06:32400 kV Vindhyachal-Kanpur line charged. 06:58Srart-up power extended to Unchahar TPS from Kanpur. 07:10Supply extended to Kanwar-Jhinjjak section of Northern Railway from 220 kV Panki sub-station. 09:11Singrauli 500 MW unit # 6.synchronised. 09:54Rihand 500 MW unit #1.synchronised.

RESTORATION SEQUENCE IN NR ON (Delhi-BBMB system.) 05:05Attempt (unsuccessful) to self start unit at Bhakra(R) 06:15Unit self started at Bhakra (L) and power extended to Ganguwal. 06:30Power extended to Jamalpur (Punjab) 06:53Power extended to Dhulkote (Haryana) 06:55Power extended to UT Chandigarh 07:07Power extended to Panipat. 07:28400 kV Panipat-Dadri charged but tripped on over voltage. 07:56Power extended to Kurukshetra. 08:37Power extended to Narela (Delhi) 08:47Power extended to 400 kV Dadri from Panipat. 09:08Power extended to 400 kV Ballabhgarh. 09:19Gas turbine at Dadri(Gas) synchronised. 09:54Power extended to 400 kV Mandola (Delhi) 10:17Whole system collapsed due to load generation imbalance.

10:33Unit at Bhakra (R) self started but desynchronised at 10:46 hrs. 10:47Unit at Bhakra (R) self started but desynchronised at 10:52 hrs. 11:00Unit at Bhakra (R) self started and power extended to Ganguwal. 11:09Power extended to Dhulkote. 11:11Power extended to Chandigarh. 11:14Power extended to Panipat. 11:25Power extended to Panipat (T). 11:30Power extended to Kurukshetra. 11:42Power extended to Pong. 11:55Power extended to Sangrur and Barnala. 12:25Power extended to Narela (Delhi). 12:37Power extended to Baira suil from Pong. 13:05Power extended to 220 kV Ballabhgarh. 13:08Power extended to BTPS from Ballabhgarh. 13:32Eastern U.P. and BBMB system synchronised through 400/220 kV ICT at Ballabhgarh. RESTORATION SEQUENCE IN NR ON (Delhi-BBMB system.) (Contd.)

RESTORATION SEQUENCES ON (Rajasthan) 04:46Start-up power availed at R.P. Sagar from Gandhi Sagar Hydro Power Station (M.P). 05:00Unit # 4 started at TPS. 05:38GT # 2 started at Anta GPS. 05:47Supply extended to Railway traction stations and Swaimadhopur. 05:52Supply extended to Jawahar Sagar Hydro Power Station. 06:05RAPS-A which was successfully islanded was synchronised to WR Grid through Modak-Ujjain line. 06:42Power supply extended to Jaipur city. 07:55Power supply extended to Railway Traction around Gangapur city. 11:15Kota TPS unit # 2 synchronised. 14:18Rajasthan system synchronised with BBMB system.

SOUTHERN REGION AREA636,249 SQ. KMS. POPULATION223 MILLION PEAK DEMAND18,500MW 370 MU / DAY STATES AFFECTEDAP, KARNATAKA KERELA, TAMIL NADU PONDICHERY RLDC LOCATION BANGALORE

EASTERN REGION AREA425,432 SQ. KMS. POPULATION227 MILLION PEAK DEMAND7000MW 130MU / DAY STATES AFFECTEDBIHAR, WEST BENGAL, ORISSA, SIKKIM, JHARKHAND RLDC LOCATIONCALCUTTA

WESTERN REGION AREA951,488 SQ. KMS. POPULATION230 MILLION PEAK DEMAND20,000MW 415MU / DAY STATES AFFECTEDGUJARAT, GOA, MP, MAHARASHTRA, DADRA & NAGAR HAVELI, DAMAN & DIU, CHHATTISGARH RLDC LOCATION MUMBAI

POWER FROM BHAKRA & SELF STARTING HYDROS IMPORT FROM ER (SASARAM)` IMPORT FROM WR (VINDHYACHAL BYE PASS) SELF STARTING OPEN CYCLE GAS TURBINES