交直流混合配电网区间潮流等效算法

To assess the influence of uncertainties such as intermittent distributed generations and random loads on voltage uncertainty level in AC/DC hybrid distribution networks, an equivalent algorithm of interval power flow (IPF) was proposed in this paper. Firstly, aimed at AC and DC distribution networks, respectively, the sufficient conditions to deterministic equivalent and their mathematical proof were derived according to their characteristics of topology and operation. Then, regarding the AC/DC hybrid distribution network, the IPF calculations of AC and DC networks were transformed into nonlinear programming problems. Combining the deterministic equivalent and alternate iterative method, an algorithm flow of equivalent interval power flow applied to hybrid distribution networks was further designed. The verification results based on the test AC/DC hybrid distribution network modified from IEEE 33-bus system demonstrate the validity of sufficient conditions. The accuracy and superiority of IPF equivalent algorithm applied to AC/DC hybrid distribution networks were also verified through Monte Carlo-based probabilistic load flow with a variety of control modes for converter stations.