K. Venkatraman

Performance of custom power devices in SCIG based Wind farms during abnormal grid conditions

The concept of improving fault ride through capability of induction generator based wind farms is securing great importance due to the rising dependency of power system in wind energy conversion systems. This work explores the application of Distribution STATic COMpensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) for the compensation of reactive power during grid disturbances. In this paper, Squirrel Cage Induction Generator (SCIG) based directly connected wind farm is considered. Performance of wind farm in the presence of shunt connected D-STATCOM and series connected DVR is analyzed separately in MATLAB/Simulink environment.

Investigation on Series Active Filter with Small Energy Source for DC Voltage Control

This paper presents an analysis of Series Active Filter (SAF) in conjunction with boost converter fed from a small capacity Renewable Energy Source (RES) for the control of DC voltage. Two control schemes like PI controller based Sinusoidal Pulse Width Modulation (SPWM) switching and hysteresis voltage controller based switching have been employed in the study. Boost converter is used to maintain the required DC voltage of SAF. The percentage total harmonic distortion of the compensated load voltage has been considered as a measure for comparison. It has been observed from the simulation results that under non sinusoidal supply and non liner loading conditions, the performance of SAF with hysteresis voltage controller is better.

Capability evaluation of four-leg DSTATCOM for compensating multifarious loads

Abstract A four-leg distribution static compensator (FL-DSTATCOM) has been investigated to achieve harmonic elimination, supply current balancing, compensation of reactive power and current in the neutral conductor of a three-phase, four-wire distribution system with various types of static, dynamic and combined loads. The capability of FL-DSTATCOM for compensating reactive power under dynamic condition is evaluated with induction machine having variable load torque. Also, the performance of FL-DSTATCOM is evaluated with combined load, which is a combination of dynamic and unbalanced static loads. The FL-DSTATCOM injects reactive and harmonics components of load current extracted using synchronous reference frame theory. With FL-DSTATCOM, the unbalanced, harmonic and reactive loads will appear to the main power supply as balanced, linear and unity power factor load. Hence, the main power supply would deliver only fundamental frequency positive sequence components of load current. The switching pulses are generated by employing hysteresis current controller. MATLAB/SIMULINK has been used for capability evaluation under multifarious loading conditions considering IEEE standard 519. The simulation results prove that the FL-DSTATCOM is capable of making the supply current as balanced and sinusoidal, maintaining the PF at point of common coupling near to unity and reducing the supply neutral current very close to zero.

Application of D-STATCOM in SCIG based windfarms during normal and abnormal grid conditions

Wind energy conversion systems contribute a significant fraction of total electric power generation from renewable energy based systems. Since several decades, Squirrel Cage Induction Generator (SCIG) has been considered as the backbone of wind power industry. The concept of dynamic reactive power compensation of induction generator based wind farms is gaining paramount importance because of the formation of weak grids due to the increased penetration of such wind farms. The purpose of the present work is to explore the applications of Distribution STATic COMpensator (D-STATCOM) in SCIG based wind farms for the compensation of reactive power during both normal and abnormal grid conditions.

Performance analysis of Series Active Filter under non sinusoidal supply and non linear loading

This paper presents a comparative analysis of performance of Series Active Filter (SAF) under different operating conditions such as non sinusoidal supply and non linear loading. Two control schemes like PI controller based Sinusoidal Pulse Width Modulation (SPWM) switching and hysteresis voltage controller based switching have been employed in the comparative study. The percentage total harmonic distortion of the compensated load voltage has been considered as a measure for comparison. It has been observed from the simulation results under various operating conditions that the performance of SAF with hysteresis voltage controller is better.

Performance of Series Active Filter in low voltage distribution system with non linear loads

Investigation on the performance of Series Active Filter (SAF) in a low voltage distribution system with non linear loads is presented in this paper. Two control schemes like PI controller based Sinusoidal Pulse Width Modulation (SPWM) switching and hysteresis voltage controller based switching have been employed in this investigation. The percentage total harmonic distortion of the compensated load voltage has been considered as a measure for comparison. It has been observed from the simulation results under various loading conditions that the performance of SAF with hysteresis voltage controller is appreciable.