A solar energy harnessing system is shown in the figure below, where PV generation station contains...
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A solar energy harnessing system is shown in the figure below, where PV generation station contains DC/DC converter, solar PV panels, energy storage unit. The demanded real power of the load is provided by the PV generation station. The reactive power demand of the load is supplied by the DC/AC inverter. Assume that the load is always at its rated power of 500KVA with the power factor of 0.8 lagging. The voltage at bus 5 is kept at its rated value. Ignore losses in each of the DC/DC converter, DC/AC inverter, transformers T, and T2, and the transmission line. 2 T1 4 T2 5 Line PV generation Load station DC/AC 500KVA Inverter 500KVA 120V/3.2kV 500KVA P.f.=0.8 lagging 500KVA 3.2kV/240V The solar PV panels are controlled using a technique which can achieve maximum power point tracking (MPPT) at different irradiance levels. With the implementation of MPPT, the maximum power at each irradiance is shown in the figure below. 800 700 600 -500 400 a 300 200 100 200 400 600 800 1000 1200 1400 Irradiance (W/m2) Assume that at one moment, the irradiance level is 400W/m, find the power generated by the PV panels from the curve. Will it be sufficient to supply the load? If not, how much power is needed from the energy storage unit? At another moment, the irradiance level is 1000W/m, find the power generated by the PV panels from the curve. Will it be more than the load demand? If yes, how much power is stored into the energy storage unit? Power (kW) A solar energy harnessing system is shown in the figure below, where PV generation station contains DC/DC converter, solar PV panels, energy storage unit. The demanded real power of the load is provided by the PV generation station. The reactive power demand of the load is supplied by the DC/AC inverter. Assume that the load is always at its rated power of 500KVA with the power factor of 0.8 lagging. The voltage at bus 5 is kept at its rated value. Ignore losses in each of the DC/DC converter, DC/AC inverter, transformers T, and T2, and the transmission line. 2 T1 4 T2 5 Line PV generation Load station DC/AC 500KVA Inverter 500KVA 120V/3.2kV 500KVA P.f.=0.8 lagging 500KVA 3.2kV/240V The solar PV panels are controlled using a technique which can achieve maximum power point tracking (MPPT) at different irradiance levels. With the implementation of MPPT, the maximum power at each irradiance is shown in the figure below. 800 700 600 -500 400 a 300 200 100 200 400 600 800 1000 1200 1400 Irradiance (W/m2) Assume that at one moment, the irradiance level is 400W/m, find the power generated by the PV panels from the curve. Will it be sufficient to supply the load? If not, how much power is needed from the energy storage unit? At another moment, the irradiance level is 1000W/m, find the power generated by the PV panels from the curve. Will it be more than the load demand? If yes, how much power is stored into the energy storage unit? Power (kW)
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Managing Controlling and Improving Quality
ISBN: 978-0471697916
1st edition
Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund
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