Tv Triangle Case Study

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V. CASE STUDY FOR A TWO-STAGE CONVERSION For two stage grid connection the PV array consists of 5 series and 11 parallel string. After that the boost converter used which are controlled to extract maximum power and at the same time to control the dc link voltage at 600 volts. Inductance of 10mh and capacitance of 2500 µF are used in the boost converter. The three phase VSI has the current control loop and the inverter is modeled to supply 20amps line current. The IGBT model used is STGW30NC120HD. Fig.4.Two stage control diagram A. Control Strategies • MPPT: - In this article perturb and observe MPPT algorithm is used for simplicity.If there is an increment in the power, the perturbation should be kept in the same direction and if the power…show more content…
The input to the PLL is the three-phase grid voltage, which will be converted in to synchronously rotating reference frame and the PLL gets locked by setting V*d to be zero. Where V*d is the direct-axis reference voltage. The loop filter PI is a low pass filter and is used to provide the controlled signal to the Voltage Controlled Oscillator (VCO) which acts as an integrator. The output of the PI- controller is the grid frequency, which will be integrated by the VCO to obtain the phase angle of the converter. Whenever the difference of phase angles between the inverter and the grid reduced to zero, PLL becomes active which results in synchronously rotating voltage vectors with Vd as zero and Vq will be of the magnitude of grid voltage. The next question is about the active and reactive components of grid current. Simply active component of grid current means the component which defines the active power and reactive component of grid current means the component which defines the reactive power .Sine the reference vector rotating in the dq-reference frame has aligned with quadrature-axis means, Vd will be zero and Vq will be of the magnitude of grid voltage. In this case the in phase component that is quadrature-axis current will be the active current and direct-axis current will be the reactive current component as shown in Figure

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