M. Jagadeesh Kumar

Voltage Profile Improvement Using FACTS Devices: A Comparison between SVC, TCSC and TCPST

If the reactive power of the load is changing rapidly, then a suitable fast response compensator is needed Static VAR Compensator (SVC) thyristor control series compensator (TCSC) and thyristor control phase shift transformer (TCPST) is such a compensator which belongs to FACTS family. The ultimate objective of applying reactive shunt compensation in the line is to improve the voltage profile. The inclusion of the FATCS devices in the circuit improves the reactive power in the line. FACTS are successfully simulated and the results show the voltage profile improvement.

Voltage Quality Improvement Using DVR

The problem of voltage sags and Swells and its severe impact on sensitive loads is well known. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR), which is one of the most efficient and effective modern custom power devices used in power distribution networks. This paper described DVR principles and voltage correction methods for balanced and/or unbalanced voltage sags and swells in a distribution system. Simulation results were presented to illustrate and understand the performances of DVR under voltage sags/swells conditions. The results obtained by simulation using MATLAB confirmed the effectiveness of this device in compensating voltage sags and swells with very fast response (relative to voltage sag/swell time).

Non Linear Control of STATCOM

This paper presents an investigation on a voltage regulator for parallel operated isolated synchronous generators supplying 3-phase 4-wire loads driven by constant speed prime mover like diesel engine, bio-mass, gasoline, hydro turbine unit etc. The proposed voltage regulator is realized using a STATCOM (static compensator) for providing the reactive power compensation, and load balancing. Three single-phase thyristors based VSC along-with three single-phase transformers and self supporting DC bus is used as a voltage controller for supplying 3-phase 4-wire loads. The neutral point of the load is achieved using neutral point of the excitation capacitors and primary windings terminal of the transformers. The proposed isolated electrical generating system is modeled and simulated on MATLAB using Simulink and PSB (Power System Blockset) toolboxes. The performance of proposed voltage controller for isolated synchronous generators is demonstrated while feeding loads.

Application of integrated wind energy conversion system (WECS) and photovoltaic (PV) solar farm as Statcom to regulate grid voltage during night time

This paper presents the concept of utilizing photovoltaic (PV) solar farm (SF) as flexible ac transmission system controller-static synchronous compensator, to regulate the point of common coupling voltage during night time when the SF is not producing any active power. The proposed control will enable increased connections of WECS to the grid. MATLAB/Simulink based simulation results are presented for validation of the system.

Comparison of FBLC (Feed-Back Linearisation) and PI-Controller for UPFC to enhance transient stability

An Unified Power Flow Controller (UPFC) is a typical Flexible AC Transmission System (FACTS) device playing a vital role as a stability aid for large transient disturbances in an interconnected power system. This paper deals with the design of Feedback Linearising Controller (FBLC) for UPFC. The 3-phase fault is created on the SMIB system and the results are simulated. The results proved the supremacy of the Power System Stabilizer (PSS) equipped with FBLC over the PSS equipped with Proportional Integral(PI) controller.

Voltage stability improvement using “Sen” transformer

This paper covers the modelling of the standard IEEE 14 bus system using the MATLAB package. The basic system is tested under large and small disturbances to study the dynamic behaviour of the system and the stability margins associated with the different configurations of the system. As a suggested solution to increase stability margins of the system, Sen transformer is added, modelled and tested to show the effect of the controller on the different stability margins under both large and small disturbances.

Compensation of voltage sag and harmonics by dynamic voltage restorer without zero sequence blocking

Amic Voltage Restorer (DVR) is a power electronic device to protect sensitive loads from voltage sag. Commonly, sensitive loads are electronic-based devices which generate harmonics. This paper presents fuzzy polar based DVR as voltage sag restorer and harmonics compensator without zero sequence blocking. Research presented in this paper uses d-q-0 axis method considering of the value of neutral axis, because the method works very well if the neutral axis value is zero. Result shows that this method can compensate voltage sag with a compensation error of 0.99%. Using this method, DVR may reduce voltage THD from 10.22% to 0.66%.

Transient Stability Enhancement of a Multi-Machine System Using BFOA

The Static Synchronous Compensator (STATCOM) is the typical Flexible AC Transmission System (FACTS) devices playing a vital role as a stability aid for the large transient disturbances in a multi-machine power system. This paper deals with the design of STATCOM with two different controllers installed in a multi-machine power system. The disturbances are created in the multi-machine system and the results obtained are analyzed. The results proved the supremacy of the feedback linearizing controller tuned by Bacterial Foraging Optimization Algorithm (BFOA) of STATCOM over the power system stabilizer (PSS) equipped with PI Proportional-Integral controller of STATCOM.

Comparison of PSO tuned feedback linearisation controller (FBLC) and PI controller for UPFC to enhance transient stability

An Unified Power Flow Controller (UPFC) is a typical Flexible AC Transmission System (FACTS) device playing a vital role as a stability aid for large transient disturbances in an interconnected power system. This paper deals with the design of Feedback Linearising Controller (FBLC) tuned by PSO for UPFC.The disturbances are created in the SMIB system and the results are simulated. The results proved the supremacy of the Power System Stabilizer (PSS) equipped with FBLC over the PSS equipped with Proportional Integral (PI) controller.

Modelling and Voltage Stability Enhancement Using “Sen” Transformer

This paper covers the modeling of a 2 bus system using the Matlab package. The basic system is tested under large and small disturbances to study the dynamic behavior of the system and the stability margins associated with the different configurations of the system. As a suggested solution to increase stability margins of the system, Sen transformer is added, modeled and tested to show the effect of the controller on the different stability margins under both large and small disturbances.