Optimized generator tripping method and device for regional power grid abundant electric power direct current delivery system

Abstract

The invention provides an optimized generator tripping method and device for a regional power grid abundant electric power direct current delivery system. The method comprises the following steps: acquiring the total quantity of sets required to be cut off in a regional power grid after a direct current block fault; cutting off wind turbine generators with bus transient voltage variation larger than or equal to high pressure resistant capability at a wind turbine generator side in a direct current near zone before and after the direct current block fault, and calculating capacity of the sets required to be cut off complementally in the regional power grid of a security control system and the total quantity of sets required to be cut off in a provincial power grid; and cutting of within-province sets in a provincial power grid generator tripping sequence. The optimized generator tripping method and device for the regional power grid abundant electric power direct current delivery systemare strong in operability, can be used for establishing security control measures of the actual extrahigh voltage / high voltage direct current power transmission system and guiding reliable operationof the extrahigh voltage / high voltage direct current power transmission system and has great practical significance on safe and stable operation of an AC-DC hybrid power grid after the extrahigh voltage / high voltage direct current power transmission system is put into operation.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to an optimized cut-off method and device for a rich power DC external transmission system of a regional power grid. Background technique [0002] With the implementation of the air pollution prevention and control action plan and the gradual advancement of the country's vigorous development of new energy and the "West-to-East Power Transmission" energy strategy, new energy power generation technologies represented by wind power continue to develop, and long-distance, large-capacity cross-regional UHV DC projects have been put into operation one after another. At present, China is in a period of gradual adjustment of the energy structure, and limited by the pressure of ecological and environmental protection, the energy approval of thermal power units is relatively strict, and its construction and commissioning are relatively lagging behind, resulting in t...

AI Technical Summary

Problems solved by technology

After the safety control cut-off, due to the large-scale retreat of the power flow, the bus voltage of the substation near the DC converter station increases, which may exceed the upper limit of the normal operating voltage of the equipment and damage the electrical equipment; Causes overload of weak sections in the regional power grid, and even causes risks such as voltage instability in local areas

Therefore, how to select the cut-off position after the DC blocking fault, so as to ensure the stability of the regional power grid frequency, and at the same time reduce the section overload caused by the large-scale power fluctuation caused by the cut-off, the voltage instability in some areas, and the DC converter station. A series of secondary problems such as steady-state overvoltage in the near area have great practical significance for the formulation of safety control measures, guidance for UHV / HVDC transmission systems, and stable operation of interconnected grids after they are put into operation. Related research on this issue

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