Study on voltage stability index based on branch power flow;

Branch outages and branch power flow off-limits are important factors of voltage instability.

Based on electrical dissection of AC branches, an optimal capacitor switching method of distribution network is proposed.

Using conventional analysis method of electric power network, it is difficult to obtain exact branch dissecting information with different sources and flows of network transmitting along AC branches.

State estimation method of distribution network based on load current takes load current as state variable, the branch measurement function is represented with load current, and the state estimation value of branch current can be obtained, which reduces the solution space of state estimation problem and raises the convergence of algorithm and calculation speed.

A new SE algorithm for distribution network is developed, its power flow algorithm is based on the ZBUS method and for the arborescent radial structure of distribution network a measurement transformation method based on branch current is adopted .