Assessment method of dynamic voltage recoverability of sending end alternating-current and direct-current hybrid system after failing

A technology of dynamic voltage recovery and AC-DC hybrid connection, which is applied in the direction of instruments, data processing applications, calculations, etc., and can solve problems such as the dynamic voltage recovery capability of the DC sending end system.
CN103177397AActive Publication Date: 2013-06-26STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
Publication Date
2013-06-26

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Abstract

The invention relates to an assessment method of dynamic voltage recoverability of a sending end alternating-current and direct-current hybrid system after failing. The assessment method includes equating statically a practical system into an equivalent system, solving the dependency of the power angle of a system generator and an output power and the dependency of voltage and power angle, solving an acceleration area and a retardation area, and solving equivalent area stability margin (EASM) index. The higher the EASM index is, the higher the dynamic voltage recoverability of the sending end alternating-current and direct-current hybrid system after failing is. On the premise of not performing a time-domain simulation, the dynamic voltage recoverability of the sending end alternating-current and direct-current hybrid system after failing can be assessed with the assessment method, so that strength of the alternating-current and direct-current hybrid system is reflected. The EASM index can reflect affections of multiple factors on the voltage recoverability; and the multiple factors include generator inertia time constants, system short-circuit ratio, system initial working condition and the like. The problem that simulation precision has to be as precise as a generator inertial time constant in time-domain simulations is avoided.
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Description

technical field

[0001] The invention relates to an AC / DC hybrid power grid system, in particular to an evaluation method for the dynamic voltage recovery capability after a failure of the AC / DC hybrid system at the sending end. Background technique

[0002] With the advancement of my country's western development and power energy strategy, a number of UHV and EHV DC power transmission projects concentrated in the Jinsha River and Yalong River basins in Sichuan have started construction, and the corresponding AC-DC hybrid systems at the sending end of hydropower are also gradually built. However, the completion of the AC / DC hybrid system will cause many problems in the operation of the power grid.

[0003] In order to evaluate the interaction between AC and DC systems, it is often necessary to use a variety of indicators to evaluate the strength of the hybrid system. In traditional methods, the short-circuit ratio and the effective inertia time constant are often the two maj...

Claims

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