Flow-based voltage supporting ability evaluation method of multi-infeed direct-current receiving-end power grid

The invention provides a flow-based voltage supporting ability evaluation method of a multi-infeed direct-current receiving-end power grid. The method comprises the following steps: (A) calculating flow of the multi-infeed direct-current receiving-end power grid; (B) constructing a nodal-admittance matrix Y of a receiving-end alternating-current power grid; (C) calculating a nodal-impedance matrix Z, which is an inverse matrix of the nodal-admittance matrix Y; (D) calculating voltage supporting ability evaluation indexes of a to-be-inspected direct-current power transmission system feed node; and (E) evaluating the voltage supporting ability of the to-be-inspected node. According to the flow-based voltage supporting ability evaluation method, the problem of no voltage supporting ability evaluation method suitable for a general multi-infeed direct-current receiving-end power grid at present is solved.