Distributed PV Hosting Capacity Assessment of Distribution Network Based on Global Probabilistic Voltage Sensitivity

The scale of distributed PV integration into the distribution network is increasingly expanding recently. It is of significant importance to accurately assess the maximum capacity of distributed PV for ensuring the safe operation of the distribution network and PV planning. Therefore, an distributed PV hosting capacity assessment method of distribution network based on global probabilistic voltage sensitivity is proposed. Firstly, a voltage sensitivity model for the distribution network is constructed based on linear power flow model. Subsequently, a Gaussian mixture model is employed to establish a probability distribution model for the prediction errors of distributed PV. The probability analytical expressions for power fluctuation and voltage fluctuation are derived through the affine invariance of the Gaussian mixture distribution. Then, the probability distribution of voltage exceedance and voltage violation criteria are studied to calculate the hosting capacity of distributed PV in the distribution network. Finally, the adaptability and effectiveness of the proposed method are verified using an IEEE 33-node distribution network.