Power System Secondary Voltage Control Method and System Based on Trajectory Sensitivity

Abstract

The invention discloses a trajectory sensitivity-based secondary voltage control method and system of a power system. After the reactive power adjustment amount of the control variable is determined through coordinated secondary voltage control, whether the power grid voltage after the coordinated secondary voltage control is evaluated based on key fault sets The voltage stability limit is exceeded, and then the minimum deviation between the voltage and the voltage stability limit and the minimum control cost are used as the control objective function, and based on the trajectory sensitivity, a quadratic programming model is established to determine the reactive power adjustment of the control variable. The power adjustment amount and the original control variable reactive power adjustment amount are merged, and the constraint conditions in the coordinated secondary voltage control are corrected, and then the controlled variable reactive power adjustment amount is determined by the coordinated secondary voltage control until the coordinated secondary voltage control is performed based on the key fault set evaluation. After voltage control, the grid voltage will not exceed the voltage stability limit. The present invention increases the safety check of power grid disturbance voltage recovery on the basis of the original coordinated secondary voltage control, and improves the long-term stability of the system voltage.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a trajectory sensitivity-based secondary voltage control method and system of a power system. Background technique [0002] Based on the partition-based secondary voltage control method, each partition is controlled independently, and the interaction with the region is not considered. The voltage control partition adopts the method of hierarchical partition, which forcibly decouples the connection between the voltage levels. When faults occur in other partitions, since the change of the central bus voltage in the non-faulty partitions is generally small, the reactive devices in the non-faulty partitions generally do not operate, and even the secondary voltage control reduces the effect of the reactive power adjustment equipment on the system. reactive support. Under severe fault conditions, the system cannot fully mobilize the most favorab...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the existing secondary voltage control technology does not consider the transient characteristics of the system, and cannot fully mobilize reactive resources to quickly restore the voltage under severe fault conditions, the present invention provides a power system secondary based on trajectory sensitivity. Level voltage control method and system

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