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K. Haritha , S. Kumar , Venugopal N. , Ch. Jayavardhana Rao , P. Raju

Abstract

This paper proposes an improved hybrid distribution static compensator (DSTATCOM) topology to compensate reactive and non linear loads with reduced VSI rating, DC link voltage and filter size. An LCL filter with small value of inductor compared to traditional L filter has been used at the front end of a voltage source inverter (VSI), which provides the elimination of switching harmonics. Voltage of the DSTATCOM can be reduced with capacitor to be connected in series with an LCL filter. Consequently the power rating of the voltage source inverter has been decreased. With reduced dc-link voltage, the voltage across the shunt capacitor of the LCL filter will be also less. It will reduce the power losses in the damping resistor as compared with the traditional LCL filter with passive damping. Therefore, the proposed DSTATCOM topology will have reduced weight, cost, rating, and size with improved efficiency and current compensation capability compared with the traditional topology. A systematic procedure to design the components of the passive filter has been presented. The effectiveness of the proposed DSTATCOM topology over traditional topologies is validated through simulation.

Keywords

Distribution static compensator (DSTATCOM), Hybrid topology, passive filter, power quality (PQ)

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K. Haritha ¹, K. R. S. Sambasivarao ¹

Affiliations
1 Centre for Biotechnology, Acharya Nagarjuna University, Guntur (A.P.), IN

Abstract

Phytases catalyse the hydrolytic degradation of phytic acid and its salts and are added to monogastric animal feed to ameliorate the negative environmental and nutritional consequences of dietary phytate. Improvement of phytase production by submerged fermentation from Rhizopus oligosporus 556 strain using 1% wheat bran was attempted by optimizing the culture medium. The phytase activity appeared to be more after 8 days of fermentation Maximum phytase production was 39U/ml after under optimal conditions i.e. 5%glucose and 0.5% of peptone at pH 6. Phytase production was affected by inorganic phosphate content and high levels of inorganic phosphorus repress the biosynthesis of phytase.

Keywords

Phytase, Rhizopus Oligosporus556, Submerged Fermentation, Phytate Degradation.

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