Online strategy optimization calculating method for electric system transient state safety and stability emergency control

Abstract

The invention discloses an online strategy optimization calculating method for electric system transient state safety and stability emergency control, and belongs to the technical field of electric system emergency control. According to the online strategy optimization calculating method for the electric system transient state safety and stability emergency control, based on a transient state safety and stability quantitative analysis theory, control performance index calculation methods of direct current system power emergency modulation, generator removal, load removal and partial power grid disconnection are proposed with control measure cost and control effects taken into consideration; according to different characteristics of safety and stability problems of transient state power angles, voltages and frequency, control measures are selected in a candidate control measure space according to control performance indexes from large to small; corresponding active power control measures are further matched according to steady state frequency estimated values after control, calculation and transient state safety and stability quantitative evaluation of the control measures are further carried out, and the control measures are increased continuously through iteration. The online strategy optimization calculating method for the electric system transient state safety and stability emergency control overcomes the defects in an existing online strategy optimization calculating method for the transient state safety and stability emergency control and meets the actual demands of the online strategy optimization calculation for the large power grid transient state safety and stability emergency control.

Description

technical field [0001] The invention belongs to the technical field of electric power system emergency control, and is suitable for the optimization calculation of the online control strategy of the second safety defense line of the electric power system. Background technique [0002] Due to the mismatch between the distribution of energy resources and the load area, grid interconnection and cross-regional power transmission have become the development trend of modern power grids. With the increase of load, the increase of power transmission distance, the commissioning of a large number of high-voltage DC transmission and flexible AC transmission systems, and the access of a large number of intermittent new energy generation, the dynamic characteristics of large power grids are becoming more and more complex, and the operation and control of power grids is difficult. The risk of safe and stable operation of the power grid is gradually increasing. Realizing online analysis a...

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Problems solved by technology

One is the optimization that only considers the transient power angle stability constraints; the other is the optimization that only considers the generator cut-off or fast shutdown

Also, no generator participation factor was introduced in the optimization

In fact, the dynamic characteristics of large power grids are very complex, which solves the problem of transient power angle stability, but cannot ensure the safety and stability of the transient voltage and frequency of the power grid; on the one hand, it may be difficult to ensure the transient safety of the power grid simply by cutting off the generator Stability, on the other hand, may be too costly to control

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