This paper proposes a solar PV connected into the single-phase grid connected system with Harmony Search Algorithm (HSA) for tracking the Global maximum peak point. Boost converter is connected to the grid for energy management system. This proposed scheme provides output with improved power quality under the nonlinear load conditions. Program analysis was implemented to find the peak point under various temperature and radiations. The output of the grid voltage and current can be monitored and compared with inverter output. Depends on the change in voltage and current the duty cycle of the dc-dc converter will change by HS algorithm. This proposed work involves PV panels connected in series to track the maximum peak point. The time varying radiation and temperature are fed as the inputs to the PV panel and the normal harmonic search algorithm is used for Maximum Power tracking. It generates a reference PV voltage and from the reference voltage, an optimum duty cycle (β) for the maximum peak is generated. The optimal duty cycle ratio will gives the required output power under nonlinear conditions.
This paper presents the simulation model for speed control of induction motor using SVPWM Quasi Z source inverter. Here the DC input voltage is boosted by using quasi Z network and the output of the quasi Z source network is applied to the three phase SVM based inverter. The variable voltage, variable frequency AC output of the inverter is used to control the speed of the induction motor. The simulation results with R load and induction motor load are considered for analysis. The three phase LC filter is suggested at the output to reduce the harmonics. The THD of SVM based drive system is compared with that of the SPWM inverter based system. The proposed system performance is tested using MATLAB/SIMULINK.
IV. CONCLUSIONThe SVM based QZSI system with resistive load and induction motor load are designed, modelled and results are presented. The simulation results indicate that the output is higher with SVPWM based inverter system. The THD is as minimum as 4.9% in the proposed system. The advantages of the proposed system are reduced number of switches and reduced number of passive elements. The disadvantage is that the quasi Z source network requires a coupled inductor. The present work deals with comparison of SPWM and SVM based induction motor drive systems.
Determining the fault location using conventional impedance based distance relay in the presence of FACTS controllers is a challenging task in a transmission line. A new distance protection method is developed to locate the fault in a transmission line compensated with STATCOM with simple calculations. The proposed protection method considers the STATCOM injected/absorbed current to correct the fault loop apparent impedance and accordingly calculates the actual distance to the fault location. The comprehensive equations needed for apparent impedance calculation are also outlined and the performance is evaluated and tested with a typical 400 KV transmission system for different fault types and locations using MATLAB/SIMULINK software. The evaluation results indicate that the new protection method effectively estimates the exact fault location by mitigating the impact of STATCOM on distance relay performance with error less than 0.3%.
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