Symmetrical obtaining method for nodal voltage sensitivity in alternating-direct current parallel-serial power grid

Abstract

The invention belongs to the field of power engineering and provides a symmetrical obtaining method for nodal voltage sensitivity in an alternating-direct current parallel-serial power grid. In the symmetrical obtaining method, on the premise of obtaining an independent vector, a nodal voltage vector and a nodal charging power vector of the alternating-direct current parallel-serial power grid, aunified partial derivative formula is built for obtaining the voltage sensitivity of each node according to a relationship equation of the independent vector and the nodal voltage vector, and a function relationship expression of the nodal charging power vector with respect to the independent vector and the nodal voltage vector, so that the symmetrical obtaining for the voltage sensitivity of allnodes in the alternating-direct current parallel-serial power grid is achieved, thus the symmetrical obtaining method reflects an instigating action of a direct-current feed-in system to active powerand instigated performance to inactive power, and also reflects a purpose that the work of a balancing generator in the alternating-direct current parallel-serial power grid satisfies an objective law of a circuital law.

Description

technical field [0001] The invention belongs to the field of electric power engineering, in particular to a symmetrical acquisition method for node voltage sensitivity in an AC / DC hybrid power network. Background technique [0002] At present, the AC / DC hybrid power grid needs to obtain the node voltage sensitivity in advance in order to realize reactive power planning, node voltage regulation and optimal power flow solution. [0003] The acquisition of the existing node voltage sensitivity is based on the correction equations for solving the node power balance equations of the AC-DC hybrid power network. Since the correction equations do not include the power balance equations of the nodes connected to the balance generator, so Make the sensitivity of the voltage of the node connected to the balance generator to the node injection power of all generators, DC feed-in systems and loads and the sensitivity of the voltage of other nodes to the node injection power of the node c...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a symmetrical acquisition method for the node voltage sensitivity in the AC-DC hybrid power network, aiming to solve the problem that the existing method for obtaining the node voltage sensitivity in the AC-DC hybrid power network cannot reflect the impact of the DC feed-in system on active power. The instigation of power and the instigation of reactive power cannot reflect the objective law that the work of the balanced generator in the AC-DC hybrid power network conforms to the circuit law.

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