DVR with PI Compensation Control

In power systems, the Dynamic Voltage Restorer (DVR) is a critical device used to mitigate power quality issues such as voltage sags and swells. The DVR integrated with PI compensation enables more precise voltage regulation, ensuring stable power supply at the load side. Traditional DVRs maintain constant load voltage by detecting grid voltage abnormalities and rapidly injecting compensation voltage. With the introduction of PI (Proportional-Integral) compensation, the system can dynamically adjust its output in real-time based on error signal variations, reducing steady-state error and improving response speed. The implementation typically involves error calculation between reference and actual voltage, followed by PI controller processing using discrete-time algorithms like: error_integral += error * sampling_time; compensation_output = Kp * error + Ki * error_integral; The advantage of PI compensation lies in its simplicity and reliability. The proportional component (P) provides fast response to voltage deviations, while the integral component (I) eliminates steady-state offset. Their synergistic operation enables superior DVR performance when handling complex voltage disturbances. This combination is particularly suitable for industrial applications such as semiconductor manufacturing or data centers, where operations are extremely sensitive to voltage fluctuations. Potential improvements may include adaptive PI parameter tuning to handle nonlinear load variations, or integration with advanced control strategies like fuzzy logic control to further enhance dynamic performance. Code implementation could incorporate automatic gain scheduling algorithms that adjust Kp and Ki parameters based on real-time load characteristics.