| 摘要 |
A symmetrical method for acquiring a nonlinear active power flow of a multi-terminal direct-current power grid. The method comprises: firstly, establishing a symmetrical nonlinear indeterminate equation system of a node injection active power relative to a node voltage offset according to a known parameter of a multi-terminal direct-current power grid and the known node injection active power (S1); then, establishing a symmetrical linear indeterminate equation system of a node injection active power increment relative to a node voltage offset increment according to the symmetrical nonlinear indeterminate equation system (S2); acquiring a node voltage offset and a total node voltage quantity of each node in the multi-terminal direct-current power grid according to the symmetrical linear indeterminate equation system and the known node injection active power (S3); and finally, acquiring a nonlinear active power flow of each subbranch in the multi-terminal direct-current power grid according to the node voltage offset of each node in the multi-terminal direct-current power grid (S4). Node voltage offsets of all nodes in the multi-terminal direct-current power grid are equivalently processed, the acquired all voltage offsets of all the nodes are always close to zero; without selecting a reference node, the acquired nonlinear active power flow is unique and reasonable. |
