matlab simulation of STATCOM using Hystersis control Technique

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matlab simulation of STATCOM using Hystersis control Technique

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STATCOM Simulation Using Hysteresis Control in MATLAB

A Static Synchronous Compensator (STATCOM) is a power electronics-based device used in power systems to improve voltage stability and reactive power compensation. Hysteresis control is a popular technique for regulating the STATCOM's output current due to its simplicity and fast dynamic response.

Hysteresis Control Technique Hysteresis control operates by maintaining the current within a predefined band (hysteresis band) around the reference current. When the actual current exceeds the upper limit of the band, the controller switches the STATCOM to reduce the current. Conversely, when the current falls below the lower limit, the controller adjusts the switching to increase the current. This method ensures minimal tracking error and robust performance under varying grid conditions.

Simulation Approach in MATLAB The MATLAB simulation involves modeling the STATCOM system, including the voltage source inverter, DC link capacitor, coupling transformer (if applicable), and grid connection. The hysteresis controller compares the measured current with the reference current and generates switching signals for the inverter. The simulation helps analyze key performance metrics such as: Reactive power compensation – Ability to inject or absorb reactive power as needed. Voltage regulation – Maintaining bus voltage stability under load variations. THD (Total Harmonic Distortion) – Evaluating output current waveform quality.

Advantages of Hysteresis Control Fast dynamic response – Suitable for applications requiring quick adjustments. Simple implementation – No complex mathematical transformations (unlike PWM-based methods). Inherent current limiting – Prevents excessive current spikes.

Practical Considerations While hysteresis control is effective, its variable switching frequency can lead to higher switching losses and harmonic content compared to fixed-frequency methods like PWM. Filter design and component sizing must account for these factors in real-world implementations.

This simulation serves as a valuable tool for understanding STATCOM operation and validating control strategies before hardware deployment.