Large-scale interconnected power grid spinning reserve risk assessment method based on state space division method

Abstract

The invention provides a large-scale interconnected power grid spinning reserve risk assessment method based on a state space division method Along with the appearance of a large-scale interconnected power grid, the quantity of elements of a power grid system is sharply increased, and the network scale is further complicated, thus the traditional reserve risk assessment method cannot meet the development requirements of the large-scale interconnected power grid, has the problems of curse of dimensionality in the aspect of state selection and inability of assessment in the aspect of state analysis, and can be influenced by transmission capacity restraint of area connecting lines. In the invention, the system state is selected by using a state space division method and analyzed by using a load reduction technology based on linear programming, thus the method better solves the problems of huge system scale and transmission capacity restraint of the area connecting lines in the spinning reserve risk assessment, realizes the quick and precise calculation of a spinning reserve risk index of the large-scale interconnected power grid, can provide real-time system spinning reserve information for personnel of a dispatching system, is beneficial for the dispatching personnel to taking effective measures in time, improves the reliability level of the system, and reduces the power-off risk of the system.

Description

technical field [0001] The invention relates to a power system analysis method, in particular to a large-scale interconnected power grid spinning reserve risk assessment method based on a state space segmentation method, which belongs to the field of power systems. Background technique [0002] A certain amount of spinning reserve capacity reserved by the power grid is the basis for safe and stable operation of the power grid. It can ensure that the system can smoothly transition to a new stable operating state when it is disturbed by a certain range. The risk of the power system is closely related to the size of the spinning reserve capacity. If the reserve capacity is too small, the risk of power outages will increase, which may cause serious social and economic losses. If the reserve capacity is large enough, the risk of power outages can be reduced, but at the same time it may cause waste of resources. . Deterministic spinning reserve criteria such as "load percentage" ...

AI Technical Summary

Problems solved by technology

The simulation method is suitable for large systems, but its calculation time increases sharply with the improvement of index error accuracy requirements, and the convergence is especially slow for systems with high reliability such as actual power grids

[0005] (2) The state analysis algorithm of traditional standby risk assessment can no longer meet the requirements of regional interconnection, and cannot consider the constraints of regional tie lines

Traditional reserve risk assessment usually only considers the balance of power generation and load, ignoring the

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