Rapid assessment method for performance indexes of different emergency control measures in electric power system

Abstract

The invention discloses a rapid assessment method for performance indexes of different emergency control measures in an electric power system, and belongs to the technical field of the electric power system and automation thereof. According to a transient calculation model of the electric power system, candidate emergency control information and time domain simulation data when no control is implemented, and the electromagnetic power of an emergency control moment synchronous machine is calculated directly after different candidate emergency control measures are implemented, thereby rapidly determining the variation in difference between the electromagnetic power and the mechanical power of a single machine infinite-bus equivalent machine under different emergency control measures at the emergency control moment. Furthermore, the increment of a retardation area under different emergency control measures is calculated based on an extended equal area criterion, thereby determining the performance indexes of the different emergency control measures. The rapid assessment method disclosed by the invention can be applied to offline emergency control strategy calculation or online pre-decision emergency control measure calculation, thereby being conducive to optimization and coordination among the different emergency control measures, improving the transient stability of the system, and improving the economy and the safety of operations of the electric power system.

Description

Technical field [0001] The present invention belongs to the technical field of power system automation. Specifically, the present invention relates to a method for quickly evaluating the performance indicators of different emergency control measures of the power system. Background technique [0002] Power system transient stability emergency control, as one of the most effective control measures to prevent transient instability, has been widely used in the actual operation of power systems. Power system emergency control measures include the removal of generators (including synchronous generators and wind power / photovoltaic), emergency modulation of DC transmission power, centralized load shedding, forced excitation of generators, fast control of steam turbine valves, forced compensation of series or parallel capacitors, and dynamic resistance Braking etc. Traditional emergency control generally adopts synchronous machine and centralized load shedding control measures. In recen...

AI Technical Summary

Problems solved by technology

However, due to the strong nonlinearity of the power system, it is very complicated to solve the sensitivity of the control variable to the transient stability, and it is even difficult to obtain an accurate analytical expression; although the perturbation method does not need to solve the analytical expression of the sensitivity, it has a large amount of calculation

Therefore, in engineering, the comprehensive electrical distance, the kinetic energy of the dynamic saddle point synchronous machine and other indicators are mainly used to approximate the performance indicators of emergency control measures. The accuracy is not high, and there may even be large errors in some cases

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