An emergency load control method for DC receiving end systems considering voltage stability and comprehensive cost of accidents

Abstract

The invention discloses a direct current receiving end system emergency load control method taking voltage stability and event comprehensive cost into consideration. The method comprises the steps of (1), obtaining direct current receiving end system data; (2), calculating voltage weakness indexes and identifying a plurality of load nodes of which voltages are the weakest after faults occur; (3), establishing a receiving end system emergency load control optimization problem mathematic model and carrying out approximate processing on an event penalty curve; (4), applying a primal-dual interior point method to solve a receiving end system emergency load control optimization problem; and (5), checking the event comprehensive cost and voltage satiability of an emergency load control optimization scheme. According to the method, on the premise of not increasing the comprehensive cost of the control scheme, the voltage stability and comprehensive performance of the system are improved, the calculation speed is greatly improved, the calculation quantity is effectively reduced, and the method is applicable to emergency load control.

Description

technical field [0001] The invention belongs to the technical field of emergency load control of electric power systems, and relates to an emergency load control method of a DC receiving end system in consideration of voltage stability and accident comprehensive cost. Background technique [0002] In recent years, China's high-voltage direct current transmission technology has developed rapidly, and the scale of long-distance transmission of electric energy has become larger and larger, which is conducive to reducing electricity costs, protecting the environment, and realizing optimal allocation of resources. HVDC (high voltage direct current, high voltage direct current) has greatly changed the structure of the modern power grid. For the receiving system, the proportion of external power transmission has increased significantly. HVDC unipolar or bipolar blocking will cause a large power shortage in the receiving system. Cause the generator in the system to decelerate and th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical defects of single consideration target, insufficient consideration of the voltage stability of the receiving end system and large amount of calculation existing in the prior art, and provide a DC receiving end system that considers the voltage stability and the comprehensive cost of accidents The emergency load control method improves the voltage stability of the receiving end system as much as possible without increasing the comprehensive cost of the control scheme

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