STATCOM stands for_________________

Question

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Option A: Static Synchrnous Compensator

Explanation & Concepts:
STATCOM (Static Synchronous Compensator) is a shunt-connected FACTS device based on a Voltage Source Converter (VSC). It is used to regulate voltage in electrical power systems by generating or absorbing reactive power independently of the system voltage.

Working Principle: The STATCOM operates by varying the output voltage ($V_{out}$) of the VSC relative to the transmission line voltage ($V_{bus}$). If $V_{out} > V_{bus}$, the device acts as a capacitor providing reactive power ($Q > 0$). If $V_{out}

Key Formulas: $Q = \frac{V_{bus}(V_{out} - V_{bus})}{X}$ — Reactive power exchange equation; $V_{out} = k \cdot V_{dc}$ — Output voltage as a function of DC link voltage

Key Points: It belongs to the family of Flexible AC Transmission Systems (FACTS).; It maintains voltage stability during load variations.; Unlike SVC (Static VAR Compensator), it does not rely on passive components like thyristor-switched capacitors.; It can provide both capacitive and inductive compensation.

Advantages: Fast dynamic response time; Smaller footprint compared to SVC; Constant current capability at low voltages

Disadvantages: High cost due to sophisticated power electronics; Requires high-speed switching control algorithms

Applications: Voltage stability improvement; Flicker mitigation in industrial loads; Power factor correction

Additional Info: The STATCOM uses an IGBT-based inverter to produce a controllable AC voltage behind a reactor.. Option B, C, and D are incorrect as 'Synchronous' refers to the controlled AC output mimicking a synchronous machine without the mechanical inertia.

Answer: A is correct — STATCOM is an acronym for Static Synchronous Compensator, a shunt-connected FACTS controller.

Exam Tip: Remember that STATCOMs behave like a synchronous motor or capacitor depending on the control, which is why it is called a 'synchronous' compensator.

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Option B: Stable Synchrnous Compensator

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Option C: Static Synchrnous Control

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Option D: Stability Synchrnous Compensator

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