STABILITY ANALYSIS OF DFIG WIND POWER SYSTEM USING PI CONTROLLER WITH STATIC FEEDBACK

When wind electricity is associated with an electric grid affects power quality. The consequences of the power quality like active & reactive power, change in voltage, flicker, harmonics, and electric behaviour of switching operations has to measure. The doubly-fed induction generator (DFIG) is used in most wind energy conversion systems (WECS) due to its advantage of ensuring a variable speed and running above the synchronous speed. This characteristic avoids damage to the wind turbine mechanism, especially when the measured wind speed is above the rated speed. In this paper, we present the enhancement behaviour of a DFIG by the PI regulator

Various Modulation Options for OFDM in 5G System: A Comparative Approach

The loss of information and signal quality degradation is the major issue in wireless communication due to multipath fading. The ‘multi-input multi-output (MIMO)’ antenna system can be used to minimize the signal fading which alternatively reduces the error rates but at the cost of hardware complexity, power consumption. The most critical issue in wireless communication is the availability of bandwidth, and signal quality. These issues can be resolved satisfactorily with the employment of ‘orthogonal frequency division multiplexing (OFDM)’ system. The significant functional element of the OFDM system is the kind of modulation technique employed.  Various modulation techniques are employed in the OFDM system to enhance the data rates as well as to reduce the error rates. This article focuses on the error rate behavior of different PSK and QAM modulation techniques used in the OFDM system

A Review on PAPR Reduction in Perspective of BER Performance in MIMO-OFDM Based Next Generation Wireless Systems.

Today, high speed and trustworthy wireless communication over mobile is the requirement of society. As the mobile applications and the users are rapidly increasing, it is obligatory to have more reliable, high speed wireless network with high throughput, which will combat the disadvantages in existing system in this multiuser environment. In wireless system the received signal may be corrupted due to noise and interferences such as ‘inter symbol interference’ and ‘inter carrier interference’ when subjected to multi-path fading. Also the performance the system may be affected due to poor ‘bit error rate’ and high ‘peak to average power ratio’ value, which further affect the signal power and spectral efficiency of transmitted signal. The blend of ‘orthogonal frequency division multiplexing’ and ‘multi input multi output’ antenna system referred as MIMO-OFDM system, which offers the improvement in quality of service and higher throughput to satisfy the tomorrow’s need. This review article mainly focuses on various technologies adopted by different researchers for enhancing the ‘bit error rates’, ‘peak to average power ratio’, ‘signal to noise ratio’ and ‘spectral efficiency’ performances in wireless systems. We continue by highlighting the limitations and comparing results of conventional methods, schemes and algorithms proposed by different researchers.  We also focus on the multiple antenna system (MIMO), which is designed for future multiuser environment to enhance the capacity or to have high throughput along with good quality services