Voltage stability bifurcation analysis method for AC/DC hybrid power distribution network

Abstract

The invention discloses a voltage stability bifurcation analysis method for an AC / DC hybrid power distribution network. According to the method disclosed by the invention, the AC / DC hybrid power distribution network is equivalent to three portions; corresponding controllers are designed based on a differential algebra equation, wherein the controller comprises a voltage loop, a current loop and a stabilizer; voltage stability bifurcation analysis based on active power reference value variations is realized through setting system parameters and control parameters; a bifurcation inflection point and the limit power of voltage stability are determined based on an acquired bifurcation diagram, an optimal parameter of the stabilizer of the system is selected, a bandwidth value corresponding to the maximum stability margin of the system is found out, asymptotic stability analysis, static stability analysis, dynamic stability analysis and transient stability analysis of the system can be realized, a corresponding relation between the stabilizer parameter and the limit power of the system is acquired, feedback control signals of the stabilizer are set finally, and the system is controlled to operate in a range of the maximum stability margin.

Description

technical field [0001] The invention belongs to the technical field of an AC-DC hybrid distribution network, and in particular relates to a voltage stability bifurcation analysis method for an AC-DC hybrid distribution network. Background technique [0002] In the case of emerging elements such as distributed power supply, flexible DC transmission, and electric vehicles, the traditional distribution network is undergoing fundamental changes, and the AC-DC hybrid distribution network has gradually become the mainstream operation mode of the future distribution network. [0003] The DC distribution network is the core component of the AC-DC hybrid distribution network, and it is also the focus of the current AC-DC hybrid distribution theory research and engineering applications. Compared with the traditional AC distribution network, the DC distribution network has the following advantages: (1) The cost of the line is low; (2) The investment in the insulation medium of the DC c...

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Problems solved by technology

[0009] In addition, it should be pointed out that for a long period of time now and in the future, the AC distribution network will still be in a dominant position, and the DC distribution network is a supplement rather than a substitute for the existing AC distribution network. In the early stage of development, the scale is small and needs further large-scale development

At present, there are relatively few researches on AC-DC hybrid distribution network at home and abroad.

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