Method for symmetrically acquiring loss power sensitivity from AC-DC hybrid power system

Abstract

The invention belongs to the electrical engineering field and discloses a method for symmetrically acquiring loss power sensitivity from an AC-DC (alternating current-direct current) hybrid power system, and the method comprises the following steps of: acquiring an independent vector of the AC-DC hybrid power system according to the known power flow solvability of the system, infusing a relation equation among a power vector, an independent vector and a node voltage vector according to the relation equation between the node voltage vector and the independent vector to acquire the sensitivity of infusing the power vector into the node by the node voltage vector, according to the sensitivity and the known functional relationship of the node voltage vector related to the loss power vector of the AC-DC hybrid power system, and acquiring the sensitivity of infusing the power vector into the node by the loss power vector of the AC-DC hybrid power system so as to symmetrically acquire the loss power sensitivity, wherein the loss power sensitivity can show that the direct current feed-in system has the instigating effect to active power and the instigated effect to reactive power, and the generator connected with reference points meets the circuit law in the AC-DC hybrid power system.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a symmetrical acquisition method of loss power sensitivity of an AC / DC hybrid power network. Background technique [0002] At present, the optimal reactive power planning, node voltage adjustment and power flow control of the AC / DC hybrid power grid need to be obtained in advance on the premise of obtaining the sensitivity of its loss power to the node injection power. [0003] The existing methods for obtaining the loss power sensitivity of the AC-DC hybrid power grid are all 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 AC-DC hybrid power network The power balance equation of the reference node (the reference node is a node whose voltage phase is set to zero artificially specified), so the sensitivity of the loss power of the AC-DC hybrid po...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a symmetrical acquisition method for the loss power sensitivity of the AC-DC hybrid power network, aiming to solve the problem that the existing method for obtaining the loss power sensitivity of the AC-DC hybrid power network cannot reflect the effect of the DC feed-in system on active power. The instigation function and the ability to be instigated to reactive power, and the reflected reference node connected to the generator in the AC-DC hybrid power network does not conform to the problem of the circuit law

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