Two experiments wereperformed in 2019 and 2020 to study the effect of the irrigation levels and organic amendmentson nutrientavailability and peanut productivityAmendmentsas ton/fed were 5 tons of compost, 5 tons of farmyard manure and 50 kg/fed of humic acid. Irrigation as m 3 /fed were 1652, 2203 and 2754 in the first season but were 1555, 2074 and 2592 in the second one as 60, 80 and 100 % of ETc. respectively. Higher availabilityof N, P, K, Fe, Mn and Zn occurred in farmyard manuredsoils under irrigation rates comparing with other organic amendments. Increasingirrigation water increased available N and Mn in the soil, but was not significant for P, K, Fe and Zn. All used organic amendments caused a significant increase in growth parameters and productivity. The highest growth parameters and productivity were associatedwith composttreatment with all rates of irrigation compared with other treatments of organic amendments. Growth parameters were notaffectedbyirrigation ratesexcept for branched plants. The interaction between irrigation rates and organic amendments were significant for growth parameters. Adding organic amendments with and without irrigation water rates increased N, P, K, Fe, Mn and Zn concentrations in the seeds, while the high increases were found with compost combined with different rates comparing with other treatments of organic amendments. The effect of irrigation rates on nutrients concentration in the seeds was not significant except when organic amendments was applied.
The shunt active power filter (APF) has proved to be a practical device to eliminate harmonic currents and to compensate reactive power for nonlinear loads. This paper evaluates three different control methods of determining the reference compensating current for a shunt active filter that is working under balanced, unbalanced and distorted source voltages. The methods compared are the instantaneous reactive power theory (p-q), the synchronous reference frame method (d-q) and the proposed method. The simulation results are obtained by with Matlab-Simulink. The shunt (APF) and its control methods have been implemented as a prototype and tested through Digital Signal processor (DSP) showing the good performance of the developed active filter. In balanced sinusoidal source voltages, the differences between the results obtained by the three methods are of minimum importance. For unbalanced and distortion source voltage conditions, the results obtained by the methods referenced are quite different. The proposed control strategy has shown the best choice for all situations studied in this paper.
Due to the enhancement in high-speed switching semiconductor devices, the employ of threephase PWM boost rectifier (BR) has grown to be more common in the past decade. The PWM rectifier can provide input currents without distortion and with unity power factor at the supply terminals. The description and modeling of the three-phase PWM rectifier have been analyzed using the voltage source inverter (VSI) with resistive load. The proposed control scheme in this paper has two closed loops to compute the three-phase reference currents of PWM rectifier. The first, namely dc load current loop, and the second, using dc bus voltage loop. The unity power factor and reduction of pollution harmonic is completely fulfilled with current controller that is applied linear current controller. The Simulation and experimental results verify the operational characteristics of the PWM rectifier.
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