Method and system for judging broadband oscillation stability of closed-loop power system

Abstract

The invention discloses a method and system for judging broadband oscillation stability of a closed-loop power system. The method comprises the following steps: determining a broadband oscillation mode of a first subsystem of a closed-loop power system; determining an interaction variable between the first subsystem and the second subsystem according to a physical structure and an electrical relationship of the closed-loop power system; determining a transfer function model of the first subsystem and a transfer function model of the second subsystem according to the interaction variable; determining a generalized Phillips-Heffron model used for broadband oscillation analysis of the closed-loop power system; determining a generalized torque of the second subsystem to the broadband oscillation circuit; determining the sensitivity of the broadband oscillation mode to the generalized damping torque coefficient and the sensitivity of the broadband oscillation mode to the generalized synchronous torque coefficient; calculating a change value of the broadband oscillation mode of the closed-loop power system; and judging the broadband oscillation stability of the closed-loop power system according to the broadband oscillation mode of the first subsystem and the change value of the broadband oscillation mode of the closed-loop power system.

Description

technical field [0001] The present application relates to the technical field of closed-loop power systems, in particular to a method and system for judging the stability of broadband oscillations in closed-loop power systems. Background technique [0002] In recent years, power electronic equipment has been widely used in the power generation, transmission and distribution, and power consumption of closed-loop power systems. Electromagnetic conversion equipment has gradually been replaced by power electronic equipment, which has become an important trend in the development of closed-loop power systems. The power supply, power grid and load pattern Profound changes have taken place. On the power supply side, wind power, photovoltaics and other new energy sources are developing rapidly, and the proportion of new energy installed capacity is increasing day by day. On the grid side, HVDC transmission has developed rapidly and has become the main transmission form of regional i...

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Problems solved by technology

[0006] The embodiments of the present disclosure provide a method and system for judging the stability of the broadband oscillation of the closed-loop power system, so as to at least solve the problem of complex calculation of the broadband oscillation of the closed-loop power system in the prior art, analysis of DC voltage, rotational speed and other second-level time scale problems The problem of dynamic stability is relatively difficult, and it is only applied to a specific oscillation frequency band. It lacks a quantitative estimation method for the broadband oscillation mode of the closed-loop power system, and it is difficult to judge the technical problems of the broadband oscillation stability of the closed-loop power system.

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