A method and device for setting and correcting network-related protection

Abstract

The embodiments of the invention provide a grid interfering protection setting correction method. The method comprises the following steps: establishing a large-power-grid whole-process simulation analysis data model comprising a generator over-excitation restriction / overload protection model, performing a disturbance fault on a target power grid area, and based on the simulation analysis data model, screening a generator set at an over-excitation state in the target power grid area; and setting long-term permissible currents for over-excitation restriction and long-term permissible currents for rotor overload protection, of the generator set to be the same. The grid interfering protection setting correction method provided by the invention brings a generator voltage support effect into play as much as possible on the basis that set safety is guaranteed, carries out fault simulation analysis by use of the large-power-grid whole-process simulation analysis data model, and then corrects the long-term permissible currents for the over-excitation restriction and the long-term permissible currents for the rotor overload protection, of the generator set so as to improve the medium and long-term safe stable operation level of an interconnection power grid.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for setting and correcting network-related protection. Background technique [0002] With the rapid development of my country's large-scale EHV / UHV AC-DC interconnected power grid, various new equipment and new technologies of the power system have been put into operation and applied continuously, and the dynamic behavior of the system has become more complex, which makes the intermediate state after the transient process The problem of long-term dynamic stability is becoming more and more prominent and has gradually attracted great attention of power system researchers. [0003] Taking the August 10, 1996 blackout in the United States as an example, the problem of over-excitation limitation / overload protection coordination was the root cause of the accident. Analyzing the process from the occurrence of the accident to its expansion, it can be seen that ...

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Problems solved by technology

After some important lines in McNairy's network area were disconnected, the voltage in this area was low, and at the same time, the excitations of the two power plants near this power plant, Hermiston and Odisping Power Plant, were wrongly set to constant power factor control In this way, another Bodman power plant operator intervened and mistakenly switched the excitation control to manual, which limited the output of reactive power in an emergency and further deteriorated the voltage in this area, resulting in long-term low voltage in this area. McNair Rui Power Plant provides as much reactive power as possible through automatic excitation control to restore the voltage. At this time, the rotor current continues to rise due to strong excitation, etc., exceeding the allowable calorific value. These generator excitation system overexcitation limit / protection, generator Improper design and coordination of rotor overcurrent protection, overexcitation limit before the excitation current is reduced to a safe value, overexcitation protection malfunctions to cut off the generator

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