Extra-high voltage direct-current restart simulation optimization method

Abstract

The invention relates to an extra-high voltage direct-current restart simulation optimization method. The method includes the following steps that: extra-high voltage direct-current mono-polar line fault restart actual measurement data are obtained, direct-current mono-polar fault line restart parameters and post-fault alternating current system key weak cross section response condition are determined; extra-high voltage direct-current mono-polar fault line restart is simulated based on the direct-current mono-polar fault line restart parameters, and post-fault alternating current system key weak cross section response condition after simulation is determined; whether the error value of a simulation results is larger than an error result minimum value is judged; and an extra-high voltage direct-current bipolar fault line restart time sequence is determined based on an extra-high voltage direct-current mono-polar fault line optimal restart time sequence. With the method adopted, the impact characteristic of the restart time sequence after an extra-high voltage direct-current fault, and extra-high voltage direct-current mono-polar/bipolar restart on an alternating current system can be accurately simulated. The extra-high voltage direct-current restart simulation optimization method has the advantages of simple and accurate calculation process and accurate results, and can be applied to the formulation of extra-high voltage direct-current mono-polar/bipolar restart strategies and safety and stability analysis of an alternating current/direct current hybrid power grid system.

Description

technical field [0001] The invention relates to the field of power system operation and control, in particular to an ultra-high voltage direct current restart simulation optimization method. Background technique [0002] Due to the long transmission line, large geographical span, and complex climate and terrain along the line, the UHV DC line is extremely prone to instantaneous faults. In order to improve the operating reliability of the DC line, the DC line fault restart function is set in the pole control system, which can quickly restart the DC line after an instantaneous fault. However, while the DC restart function can improve the reliability of the DC transmission project, it is not good for the system stability. On the one hand, the DC line fault restart, whether successful or not, the energy impact accumulated during the fault will bring a huge threat to the stability of the AC system. On the other hand, since the safety control action is generally not triggered du...

AI Technical Summary

Problems solved by technology

At present, the domestic UHV DC power ramp rate is not known, it is related to the parameters of the DC power controller and the DC operating state, although the DC restart power recovery speed is clearly specified in the complete set of design documents, it is usually not achieved under actual operating conditions Design requirements, and may be much slower than the design value, which will bring certain difficulties to the analysis of the safety and stability of large power grids

Images