Abstract: In order to evaluate adaptability of distribution network with planned and distributed PV generation,aiming at questions of voltage and power flow beyond limit when distributed PV power supply connected to distribution network,typical distribution network topology structure and connection modes are both discussed in this paper. The standard node IEEE34 of distribution network system of distributed PV power model is established in Matlab/Simulink environment. Taking into account the risk brought by random output disturbance and load fluctuation of distributed PV power supply to the operation of distribution network, an index model of risk evaluation of node voltage and branch power flow beyond limit has been established. It is analyzed the capacity of the same node for different capacity power supply, and discussed mainly the access capacity of distributed PV power to distribution network, and carried out simulation experiments as well by taking the typical actual parameters of distribution network as an example. Our simulated results have verified validity of the evaluation adaptability of distribution network of the proposed method.

Key words: distribution network, adaptability, power flow beyond limit, risk evaluation, maximum power