TNB Operation 20Planning

Operation planning (L5)

Asean Residential School in Electrical Engineering Engineerin g (ARSEPEO6), 9 January 2007,

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A power system

Asean Residential School in Electrical Engineering Engineerin g (ARSEPEO6), 9 January 2007,

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TNB power system

EGAT (Thailand)

TNB (P. Malaysia)

PG (Singapore) Asean Residential School in Electrical Engineering Engineerin g (ARSEPEO6), 9 January 2007,

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TNB power system Transmission Voltage – – – –

500kV 275kV 132kV 66kV

Generation –

Total 18,323MW (installed) – TNB 10,836MW (59%) – IPP 7,487MW (41%)

Demand – –

12,990MW (08/06) 12,724MW (11/06) Asean Residential School in Electrical Engineering Engineerin g (ARSEPEO6), 9 January 2007,

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TNB power system

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Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Who is who in the industry (in Pen. Malaysia)


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Interconnectivity of systems (in Pen. Malaysia)


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Grid codes & licence standards


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Building operation reliability & robustness – TNB case


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Governing principles for operation – TNB case 1. TNB License (reflected in the Tra nsm ission Sy stem Reliability & Pow er Quality Standards )

2. 3. 4. 5.

The Malaysian Grid Codes TNB’s contractual obligations Operation based on the least cost TNB’s business objectives


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Governing principles (continued) 1.

TNB License; granted under the Electricity Supply Act 1990

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Transmission System Reliability Standards (TSRS)

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The Licensee shall operate & m ainta in its transm ission an d the conn ected generators, in accorda nce w ith the license sta nda rd s (i.e. Condition no.13)

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Generation security stan dards

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Operat ion u nder n o conting ency

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Opera tion un der secur ed cont ingency

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Operation un der m ultiple contingency Operation u nder u nsecured contingency Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Transmission System Power Quality Standards (TSPQS)

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Voltage sag

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Voltage step change

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Voltage fluctuations & flicker

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H arm onics

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Phase un balan ce & tr action load

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Step chan ge of pow er


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Malaysian Grid Codes

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Plan ned outag es (generator u nits & transmission) Assig n m ent of spin nin g reser v e Da y ahead unit com m it m ent and generation schedules

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W eekly operation plan

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Annual oper ation plan

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M onit orin g & testin g

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Plan ning dat a N um ber in g of equip m ent in the g rid system


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Governing principles (continued) 5. Power Purchase Agreements (PPAs) 6. Other Agreements

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13 PPAs betw een TN B & IPPs (currently in operation)

TNB-EGAT: System Interconnection Agreement (2202) Supplementary Agreement (2004)

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7. TNB requirements

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TN B Process Stan da rd isation & Im prov em en t Procedures (ISO) Risk M an agem ent Govern an ce on d isclosure of intern al information Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Operation planning (OP) tasks 1. Matching generation (output) with the forecast demand together with generation reserves 2. Taking into account, outages of generation and transmission system 3. Complying the grid codes and the license standards 4. Meeting contractual obligations 5. Meeting least cost operation 6. Carrying out OP during operational timescale


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Operation planning timescales 1. One day ahead (daily ; 24 hours; hour 0 0 :0 0 hour to hour 24:0 0 ) 2. One week ahead (w eekly Friday to Thursday ) 3. One month ahead (monthly) 4. One year ahead ( y early ; 1 Septem ber to 31 August ) 5. 2 years ahead (yearly) 6. 5 years ahead (yearly)


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Operation planning - activities Daily Processes 1. 2. 3. 4. 5. 6. 7. 8. 9.

Planning-System Operation coordination (docket meeting) Management of generator units availability Scheduling energy import/export exchange Scheduling generator unit planned outages Scheduling transmission planned outages Scheduling of commissioning (transmission) Scheduling of system tests (if any) Scheduling of unit commitment and generation schedule Assessment of system security

Monthly/ Weekly Processes 1. 2. 3. 4. 5. 6. 7. 8.

Scheduling of generator unit planned outages Scheduling of transmission planned outages Scheduling of unit commitment and generation schedule Scheduling of gas nomination Transient security assessment (WTSA) Plan coordination (OPP-NLDC meeting) Fault level & system security analysis Reports to regulators & government.

Yearly Processes 1.

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3. 4. 5.

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Two Year System Operation Plan (Transmission) Five Year System Operation Plan (Production) Generation Mix report Generation Security Standard Report Operation Coordination (Joint Operation Committees) Grid System Performance Report

As & when required 1. 2. 3. 4. 5.

Updating planning data (on the grid system and on the fuel price variation) Managing fuel supply variation (including gas curtailment). Validating availability of stand-by fuel Submission of data/reports to Regulators, Government and TNB authorities Power Quality Monitoring & Measurement Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Operation planning – an overview (as documented in TNB ISO m anual)


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Operation Planning (OP) – planning cycles Annual OP Monthly/weekly OP Daily OP Real-time Operation

NLDC department

OPP (System Planning) department Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Operation Planning (OP) – yearly cycles Annual OP Annual OP 1. Two Year System Operation Plan (Transmission) 2. Five Year System Operation Plan (Production) Monthly/weekly OP 3. Generation Mix report 4. Generation SecurityDaily Standard Report OP 5. Operation Coordination (Joint Operation Real-time Committees) Operation 6. Grid System Performance Report

NLDC department

OPP (System Planning) department Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Operation Planning (OP) – monthly/weekly cycles Annual OP

Monthly/weekly OP 1. Scheduling of generator unit planned outages Daily 2. Scheduling of OP transmission planned outages 3. Scheduling of unit commitment and Real-time generation schedule Operation 4. Scheduling of gas nomination 5. Transient security assessment (WTSA) 6. Plan coordination (OPP-NLDC meeting) 7. Fault level & system security analysis NLDC department 8. Reports to the government, regulators & TNB. OPP (System Planning) department


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Operation Planning (OP) – daily cycles Annual OP Monthly/weekly OP

Daily OP 1. Planning-System Operation coordination Real-time (docket meeting) Operation 2. Management of generator units availability 3. Scheduling energy import/export exchange 4. Scheduling generator unit planned outages 5. Scheduling transmission planned outages NLDC department 6. Scheduling of commissioning (transmission) 7. Scheduling of system tests (if any) 8.OPPScheduling of unit commitment and generation (System Planning) department schedule 9. Assessment of system security Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Five Year System Operation Plan (FYOP) FYOP addresses operation plan up to 5 years ahead, focusing on adequacy of generation capacity and production cost. FYOP report highlights: – – – – –

Demand forecast & growth Generation capacity and operating margins Generation mix Operation cost Possible mitigative measures: • Adjusting outage (maintenance) schedule • Addressing stand-by fuel & stock

Uses software tools: – PMonth™ (production schedule & cost optimisation) R ef: W ork In struction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-0 9 Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Generation Mix report (Genmix) Genmix report addresses forecast generation for the (one) year ahead, mainly as input for preparing financial budget for: • Operation of TNB’s Power Stations and • Energy payment to IPPs

Genmix report highlights (for one year ahead): – Forecast of generation production. – Forecast of generation mix by fuel type.

Uses software tools: – PMonth™ (production schedule & cost optimisation) R ef: W ork Instruction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-11


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Generation Security Standard report (GSS) Generation Security Standard (GSS) report addresses the system generation capability to meet the forecast load and energy demand for up to 5 years ahead. GSS report highlights: – Demand forecast – Generation capacity and operating margins

Uses software tools: – PMonth™ (production schedule & cost optimisation) R ef: W ork Instruction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-10


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Generator units outage scheduling The objective is to satisfy request (by IPP/TNB power plants) for planned outages for generator units (for scheduled, maintenance, repair, etc) yet to ensure: – – – – –

The grid system is secured and reliable Generation reserve margin is adequate Cost of production is maintained at optimum level Availability of gas supply is within limits (declared by Petronas) Hydro lake level (Kenyir and Temengor) are within targets

Scheduling process: – Rolling five year outage plan (maintained in a database) – Revised annually, quarterly (for TNB plants) – Finalised and confirmed weekly R ef: W ork In struction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-0 6 Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Weekly generation and unit commitment schedules

The objectives are: – – – –

To plan for generator unit start/stop schedule To estimate quantum of gas supply requirement To plan for hydro lake level (based on the current level) The plan is at the optimum cost (for the given demand forecast & planned outage schedule).

Scheduling process: – Review availability of unit & capacity of generator units – Review availability of gas supply (in mmscfd volume) – Develop generation schedule based on the demand forecast

Uses software tools: – PCOM™ (production schedule & cost optimisation) R ef: W ork In struction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-0 7


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Day ahead generation and unit commitment schedules The objectives are: – To confirm power exchange between TNB & EGAT – To develop the plan for committing generator units and their output on a half-hourly basis for 24 hours operation during the next day [See *] from hour 00:00 to hour 24:00. – To work-out that the plan meets the forecast demand with adequate spinning reserve throughout the day – The plan is at the optimum cost.

Scheduling process: – Review availability of unit & capacity of generator units – Review availability of gas supply (in mmscfd volume) – Develop generation schedule based on the demand forecast

Uses software tools: – PCOM™ (production schedule & cost optimisation) * W eekend/ holiday s are given sp ecial exception R ef: W or k Inst ruction Lev el 3 no. TN BT-S POD-750 -0 1-OPP-W I-0 3


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Two Year System Operation Plan (TYSOP) TYSOP addresses operation plan two years ahead, focusing on adequacy of transmission and stability of the grid system. TYSOP report highlights: – Operational issues in specific Regions (Northern, Eastern, Central and Southern) – Operational issues of interconnection with Singapore and with Thailand – Impacts of new generation plant coming on-line – Possible mitigative measures, taking into account: • • •

Committed transmission & generation development plan Possible transmission options Defence plan

Uses software tools: – PSS/E™ (power flow, OPF, fault level, and transient stability) – DSA Power Tools™ (transfer limit, voltage and transient security). R ef: W ork Instruction Lev el 3 n o. TN BT-SPOD-750 -0 1-OPP-W I-12 Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Transmission outage management The objective is to satisfy request for planned outages for transmission apparatus (for scheduled maintenance, repair, construction, etc) yet to ensure: – The grid system is secured and reliable – Cost of production is maintained at optimum level – The above are confirmed through studies

Scheduling process: – – – – –

Maintain details of planned outages (in a database) Coordinate with planned outages of generator units Revised monthly, confirmed one week up to 10 days ahead Revised and re-confirmed 1 day ahead Highlight controls (if necessary to maintain system security)

Uses software tools: – WOMS (Web-based Outage Management System) – PSS/E (for conducting studies of individual outage cases) R ef: W or k Inst ruction Lev el 3 no. TN BT-S POD-750 -0 1-OPP-W I-0 5 Asean Residential School in Electrical Engineering (ARSEPEO6), 9 January 2007,

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Coordination of commissioning* of transmission The objective is to satisfy request for commissioning of transmission apparatus (for new equipment) yet to ensure: – The new apparatus meet the general requirement for safe and correct operation, in terms of connectivity & labeling – Impact to the transmission network is minimum (even if the commissioning is unsuccessful)

Coordination process: – Prepare equipment drawings (3 months ahead) – Assign numbering of equipment (in the drawing) – Prepare commissioning memorandum & submit to NLDC for implementation (7 days ahead minimum) – Prepare “switching program” (in the commissioning memo)

* Com m issioning refers to energising tran sm ission equipm ent for the 1st time R ef: W or k Instruction Lev el 3 no. TN BT-SPOD-750 -0 1-OPP-W I-16


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Example of a monthly transmission outage plan


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Example of a contingency plan during outage


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Example of a commissioning memo (1)


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TNB Operation 20Planning

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