STATCOM Explained: Working Principle, Control and Applications
Introduction
A STATCOM (Static Synchronous Compensator) is a shunt-connected FACTS device used primarily for fast reactive-power compensation and voltage regulation. STATCOM technology is based on a voltage-source converter (VSC), which generates a controllable AC voltage and exchanges reactive current with the electrical grid.
Why Is STATCOM Required?
Electrical loads and transmission systems continuously change their reactive-power requirements. A shortage of reactive power can result in low bus voltage, increased transmission losses, reduced voltage stability and poor power factor.
Basic STATCOM Configuration
- Voltage Source Converter
- DC-link capacitor
- Coupling transformer or reactor
- Measurement system
- Voltage and current controller
- PWM or converter switching system
STATCOM Working Principle
The basic operating principle is based on controlling the converter voltage relative to the grid voltage. By controlling the magnitude and phase of the converter output, the STATCOM can supply or absorb reactive current.
STATCOM Supplying Reactive Power
When controlled for capacitive operation, reactive current flows from the STATCOM toward the grid and the STATCOM supports the system voltage.
STATCOM Absorbing Reactive Power
When controlled for inductive operation, reactive current flows from the grid toward the STATCOM and the device absorbs reactive power.
STATCOM Control System
A practical control system may contain a Phase Locked Loop, abc-to-dq transformation, voltage controller, current controller, DC-link controller and PWM generator. The controller measures AC voltage, AC current, DC-link voltage and reactive power and generates switching commands for the converter.
Voltage Regulation
One of the major applications of STATCOM is maintaining the voltage of a selected bus. The measured voltage is compared with a reference voltage and the controller generates a reactive-current command to reduce the voltage error.
STATCOM During Faults
Voltage can fall sharply during a short-circuit fault. A properly controlled STATCOM can rapidly provide reactive current to support the voltage and can help improve voltage recovery after the disturbance.
STATCOM Applications
- Transmission voltage regulation
- Distribution voltage regulation
- Renewable-energy integration
- Wind-farm voltage support
- Solar-power integration
- Power-factor improvement
- Voltage-stability improvement
- Dynamic reactive-power compensation
STATCOM for Solar and Wind Systems
Renewable-energy plants may experience changing operating conditions. A STATCOM can help maintain grid voltage while the renewable plant changes its active-power output. This makes STATCOM an important research area for modern power systems with high renewable penetration.
STATCOM Simulation in MATLAB/Simulink
A typical MATLAB/Simulink STATCOM model contains a three-phase source, transmission line, transformer, load, STATCOM, measurement blocks, controller and PWM generator.
Researchers can introduce a load change or fault and compare bus voltage, reactive power, active power and voltage recovery with and without STATCOM.
STATCOM Research Topics
- STATCOM for voltage stability improvement
- STATCOM for wind-energy systems
- STATCOM for solar PV systems
- Fuzzy-logic-controlled STATCOM
- ANN-based STATCOM control
- PSO-based STATCOM placement
- STATCOM for IEEE test systems
- STATCOM for transient stability
Internships and Industrial Training
Electrical and electronics students can undertake practical projects related to STATCOM, FACTS, MATLAB/Simulink, renewable energy and power electronics.
Opportunities include Internships in Pondicherry, Internships in Chennai, Internship in Cuddalore, Tamil Nadu, and Internship in Chidambaram, Tamil Nadu.
The Center for Industrial Training can support projects in Embedded Systems, Automation and IoT. Students interested in modern power electronics can also explore an Electric Vehicles Training and Testing Center.
Internship and Projects are available in online mode and offline mode.
Contact: +91-9952749533
Conclusion
STATCOM is an important modern FACTS controller for fast reactive-power compensation and voltage regulation. Its VSC-based architecture provides excellent controllability and makes it particularly useful for renewable-energy systems and networks experiencing rapid voltage changes.
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