Who is the power system operator at center level?

Question

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Option D: National load despatch center

Explanation & Concepts:
The National Load Despatch Centre (NLDC) serves as the apex body for the integrated operation of the Indian power system at the national level. It ensures the reliability and security of the National Grid by coordinating with Regional Load Despatch Centres (RLDCs) and maintaining frequency stability.

Working Principle: The Indian power grid follows a hierarchical control structure: NLDC at the top, followed by RLDCs, and then State Load Despatch Centres (SLDCs). The NLDC monitors inter-regional power flows, manages the implementation of the Merit Order Dispatch, and oversees the national-level transmission network planning and security standards. It acts as the central hub for data acquisition and real-time operational coordination across all regions of India.

Key Formulas: $f_{sys} \approx f_{ref}$ — The primary control objective to maintain nominal system frequency; $P_{gen} = P_{load} + P_{losses}$ — Fundamental power balance equation monitored by the operator

Key Points: NLDC is established under Section 26 of the Electricity Act, 2003.; It is responsible for the overall supervision of the power system in India.; Coordinates with RLDCs for scheduling and despatch of electricity across regional boundaries.; Responsible for the operation of the National Grid and inter-regional transmission of power.

Advantages: Ensures grid stability and security at a national level.; Optimizes generation scheduling to minimize transmission losses.

Disadvantages: Highly complex coordination required across diverse geographical regions.; Dependence on accurate telemetry data from remote RTUs.

Applications: Real-time grid management.; Implementation of Availability Based Tariff (ABT).; Short-term and long-term transmission planning.

Additional Info: POSOCO (Power System Operation Corporation Limited), now known as GRID-INDIA, operates the NLDC.. Option A (RLDC) manages regional grids, whereas Option C (SLDC) manages state-level operations.

Answer: D is correct — The National Load Despatch Centre (NLDC) is the apex body responsible for the integrated operation of the Indian power system at the national level.

Exam Tip: Remember the hierarchy: NLDC (National) -> RLDC (Regional) -> SLDC (State) -> ALDC (Area/Sub-state) for exam-based order of responsibility.

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Option A: Regional load despatch center

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Option B: Area load despatch center

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Option C: State load despatch center

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