Fast assessment of photovoltaic power absorptive capacity in distribution line

Abstract

Photovoltaic power (PV) generation is developing greatly nowadays. However, excessive amount of PV in operation may cause the voltage exceeding the upper limit especially in distribution grid. To solve this problem, this paper proposed a Multivariate Linear Assessment method of absorptive PV capacity in distribution network, which indicates how absorptive PV capacity changes with different line parameters. In the proposed method, a reference 10kV feeder model is built according to line characteristics, which includes 10kV cable line and 10kV overhead line. Then, the sensitivities of different line parameters affecting PV absorptive capacity are analyzed. Since the effect of line parameters is decoupling, a comprehensive method for assessing the largest PV absorptive capacity in 10kV feeder with constraint of voltage is proposed by multiple linear regression analysis, which only requires simple calculation about relevant line parameters. The simulation results based on 10kV feeders in Guangdong Power Grid show that the tolerable PV absorptive capacity can be determined quickly by the proposed method.