Method and system used for obtaining data related to power flow calculation after failure

Abstract

The invention discloses a method used for obtaining data related to power flow calculation after failure. The method comprises the following steps: S1, obtaining a power flow calculation result at a failure moment t0, and obtaining capacity Qconv of a filter in a convertor station from the power flow calculation result; S2, setting cut capacity Qcut of the filter, wherein the cut capacity Qcut ofthe filter meets the condition that Qcut is more than 0 and less than Qconv; S3, obtaining a result that whether the failure moment t0 is set to be a failure moment point of the cut capacity Qcut of the filter or not by comparing the capacity Qconv of the filter in the convertor station in the step S1 with the set cut capacity Qcut of the filter in the step S2; and S4, according to the power flowcalculation result before the failure moment t0 and the failure moment point, set in the step S3, of the cut capacity Qcut of the filter, obtaining momentary voltage, momentary transmission power andmomentary busbar voltage at the failure moment point. The method disclosed by the invention guarantees real-time monitoring on a power system line, thereby guaranteeing reliable and stable control onthe whole power system.

Description

technical field [0001] The invention belongs to the technical field of power system simulation and analysis, and in particular relates to a method and system for obtaining data related to power flow calculation after a fault. Background technique [0002] The traditional power system power flow calculation has achieved great success in power system simulation and analysis. The power flow solution obtained in the method calculation can accurately reflect the operating state of the power system. At the same time, the continuous power flow, Mathematical tools such as static safety analysis have greatly improved the ability and analysis level of safe and stable operation of power systems. [0003] But at the same time, all kinds of existing power system power flow calculation methods require appropriate initial values ​​for iterations. The general method is to use the "flat start" method, that is, before the first iteration starts, the reference voltage of each node is used as t...

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Problems solved by technology

[0004] Firstly, the filter in the converter station was cut off, causing the voltage of the converter bus to be far lower than the rated voltage; secondly, serious faults such as UHV DC blocking occurred, resulting in an imbalance between power generation and load power in the grid, and the frequency of the AC system seriously deviated from the synchronous frequency; Yes, the disconnection operation is implemented for heavy-duty lines, causing the bus voltage on both sides of the disconnected line to be much lower than the rated voltage

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