Experimental method and system for evaluating limit access capability of new energy in synchronous power grid

Abstract

The invention discloses an experimental method and system for evaluating the limit access capability of new energy in a synchronous power grid. Under a given grid structure and load level, an initial startup mode is determined, and an RTDS experiment simulation platform is built; and through fault scanning, finding out a restriction fault which enables the transient safety margin of the power grid to be the lowest. If the system can keep transient stability under all faults, the starting unit with the lowest sensitivity is replaced with new energy output according to the trace sensitivity sorting of the synchronous unit to the transient voltage; then the transient stability under the new mode is re-scanned, and the synchronous unit is continuously iterated and closed until the transient stability of the system is unstable. When the system has a local transient instability problem, after certain improvement measures are taken to solve the restrictive fault risk, iteration is continued, and finally the limit access quantity of the new energy of the power grid, which is limited by the global transient unsafety problem, is obtained. The method can provide theoretical support for development planning and mode arrangement of the power grid.

Description

technical field [0001] The invention relates to an experimental method and system for evaluating the limit access capability of new energy sources in a synchronous power grid, belonging to the technical field of power systems and automation thereof. Background technique [0002] With the large-scale grid connection of electronic new energy units, the system characteristics of the traditional AC grid characterized by synchronous generator multi-mass, inertia, damping motion, and electromechanical transient process have undergone profound changes. Since new energy units are usually connected to the grid through inverters, have no moment of inertia, and basically do not provide short-circuit current, the short-circuit capacity of the hub power station is greatly reduced, the strength of the AC system and the overall inertia of the system are greatly reduced, and the voltage and frequency of the system, etc. Stability is facing new and huge challenges. At present, new energy so...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an experimental method and system for evaluating the limit access capability of new energy in a synchronous power grid, so as to solve the problem of quantifying and evaluating the limit capacity of the power grid under multiple uncertain boundary conditions, and to provide planning, development and operation mode of the power grid Arrange for technical support

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