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Due to the severe intermittence, volatility and uncertainty of the output power, the integration of large scale photovoltaics (PVs) will inevitably impact the power flow and node voltage of a distribution network, and confront the network with higher operation risk. This paper carries out the operation risk assessment of distribution networks with high penetration of PV units, and develops measures to offset the risk. A probabilistic power flow calculation based on Monte Carlo method is proposed in this paper at first, then the operation risk assessment model for a distribution network is established based on the risk assessment indexes of node voltage and line power flow limit violation. The specific implementation of the risk assessment method is presented. Based on these works, specific risk countermeasures are proposed. The validity of the risk assessment method and effectiveness of the risk countermeasures are verified by simulation results.

Assessment and Countermeasures of the Operation Risk of Distribution Network with High Penetration of Distributed PV