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The detection of the fundamental frequency and phase angle of the positive sequence grid voltages are utmost necessary for the proper operation of controlled active power converters, which require to operate stable and robust even during the presence of diverse power quality issues. There exist various utility grid synchronization and detection methods based on Phased-Locked Loop (PLL) techniques...
This paper introduces a predictive voltage controller for multilevel inverter used in Dynamic Voltage Restorer, which is able to protect a sensitive load against grid voltage sags dynamically. The compensated voltages are obtained by using Phase-Lock Loop to detect the phase and the magnitude of the grid voltage then compare to the load reference voltage. A three-phase NPC inverter with output LC...
The well-known inherent second-order ripple power in single phase converters imposes harmonic stress on the dc link, resulting in low efficiency and overheating issues. In order to avoid installing bulky electrolytic capacitors or LC filters in the dc-link, this paper presents a differential buck inverter to improve the dc link power quality, and an improved active power decoupling method is proposed...
Nowadays the increasing utilization of renewable energy sources demand power converters capable of delivering high quality energy to the low voltage grid. The traditional dead-time compensation methods handle high-power operating conditions well, but low-power conditions and discontinuous conduction require further investigation. This paper identifies four cases of discontinuous conduction in single...
This paper presents the performance of Series Active Filter (SeAF) employing two different switching schemes like Sinusoidal Pulse Width Modulation (SPWM) switching and Hysteresis PWM switching in a single-phase distribution system. FPGA Controller has been used for implementation of the switching schemes in the experimental setup. The control algorithm of both the switching schemes of the controller...
The impact of voltage quality on the operation of sensitive equipment is very critical. Dynamic Voltage Compensator (DVC) is the prime solution to mitigate the voltage quality problems. This paper investigates the compensation performance of a DVC connected to a distribution system, equipped with a simple control based on in-phase compensation and without using any transformations for reference generation...
This paper presents a Fast On-Load Tap Changing Regulator used to correct unbalanced voltages. This regulator uses the semi natural commutation in order to improve the response. The proposed topology injects the voltage in only phase in order to balance the three phase system.
Voltage sag has been the focus of considerable research in recent years. It can cause expensive downtime. Research on voltage sag detection has also grown up and it is an essential part of the voltage sag compensator. There are many methods have been introduced to measure and detect voltage sags. Among these are RMS Value Evaluation, Peak Value Evaluation, Missing Voltage technique and Hysteresis...
In power systems it is often impractical to place monitors on all buses for recording power quality events. Therefore the accurate determination of the origin of power quality events, such as voltage sags requires unmonitored bus voltages to be estimated based on available measurements. However, available measurements are not always from an optimistic monitoring scheme. Hence a method is required...
This paper presents a fast on-load tap changing regulator used to correct unbalanced voltages. This regulator uses the semi natural commutation in order to improve the response. The proposed topology injects the voltage in only phase in order to balance the three phase system.
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