An n-1 closed-loop safety check method with embedded reactive power and voltage

Abstract

The invention provides an N-1 closed-loop safety checking method with embedded reactive power and voltage, and belongs to the field of electric power system safety constraint economic dispatching. According to the method, first an optimal power flow model of embedded reactive power and voltage is built and solved, and if the model converges, a current optimal solution of the model is output and N-1 checking is performed; each line is disconnected in sequence, sets with constraint being out of limit are calculated; if out-of-limit sets do not exist, the current optimal solution of the model isoutput; if the out-of-limit sets exist, a sensitivity matrix is calculated for open-circuit lines where an out-of-limit situation exists and a corresponding N-1 out-of-limit scene constraint is generated to be added to a constraint condition of the model, iteration of a next time is performed till lines in each of the current calculated out-of-limit sets after iteration are not increased comparedwith lines in out-of-limit sets corresponding to iteration of the last time, and the current optimal solution of the model is output. The N-1 closed-loop safety checking method with embedded reactivepower and voltage satisfies the actual operation condition of an electric power system, and has very high practical application value.

Description

technical field [0001] The invention belongs to the field of power system safety-constrained economic dispatching, and particularly proposes an N-1 closed-loop safety checking method with embedded reactive power and voltage. Background technique [0002] Static security check is an important part of the safe operation of the power grid and plays a key role in ensuring the safe operation of the power grid. Security refers to the ability to maintain the safe operation of the power grid after the system is disturbed by the outside world. Line N-1 safety check is the most common safety check in dispatching operation, that is, when the system disconnects any line, the power flows of nodes and other lines in other power grids are still within the range of safety constraints. [0003] At present, short-term and real-time security checks in our country rely on the experience and judgment of daily planning professionals and dispatching professionals, lacking the support and guarante...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing safety check methods cannot accurately reflect the actual situation of my country's power grid and cannot be used effectively

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