The interfacing of VSC ensures several functions such as maintaining DC-link voltage to set reference (estimated by MPPT
controller), reactive power compensation, harmonics mitigation and feeding extracted SPV energy into the grid such that effective power factor at the grid is unity. Fig. 2 shows the control algorithm for H-bridge VSC. A total of five quantities are sensed; which are grid voltage, grid current, load current, PV string voltage and its current. The sensed quantities are given to ADC (analog-to-digital convertor) of DSP controller, where a set of orthogonal unit vectors are derived from the grid voltage. The unit vector in phase with the grid voltage is the synchronising signal whereas unit vector orthogonal to synchronising signal is used for load feed-forward term calculation. The peak grid voltage is estimated as
The interfacing of VSC ensures several functions such as maintaining DC-link voltage to set reference (estimated by MPPTcontroller), reactive power compensation, harmonics mitigation and feeding extracted SPV energy into the grid such that effective power factor at the grid is unity. Fig. 2 shows the control algorithm for H-bridge VSC. A total of five quantities are sensed; which are grid voltage, grid current, load current, PV string voltage and its current. The sensed quantities are given to ADC (analog-to-digital convertor) of DSP controller, where a set of orthogonal unit vectors are derived from the grid voltage. The unit vector in phase with the grid voltage is the synchronising signal whereas unit vector orthogonal to synchronising signal is used for load feed-forward term calculation. The peak grid voltage is estimated as
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