Transient state stability control method and device based on trend to stable state

Abstract

The invention discloses a transient state stability control method and device based on a trend to a stable state. The method includes the following steps of obtaining different balance points which can be operated according to basic parameters of a power system, and determining an initial state set which can maintain the stability of the system, namely the initial state set trending to the stablestate; setting a multi-objective function constraint according to preset requirements, when the power system fails, obtaining the distance between the system state after the fault is cleared and the initial state trending to the stable state, and determining the initial state trending to the stable state which is the most similar to the current state of the system; through coordinated control of various power electronic devices in the power system, making the power system smoothly and rapidly transit to the most similar initial state trending to the stable state to achieve stable control overthe power system. According to the method, the system can smoothly transit to the most similar stable initial state trending to the stable state through coordinated control of the power electronic devices, so that there is no need to determine whether or not the system is unstable, stable control over the system is achieved, and the stability of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic and electromechanical transient stability analysis of power systems, in particular to a transient stability control method and device based on a tendable stable state. Background technique [0002] In related technologies, in the existing transient stability analysis and control strategies of various power systems, it is necessary to first determine whether the system is unstable (entering an alert or emergency state), and then determine the control logic. If the system is not unstable, the emergency control strategy is not adopted, and if it is unstable, the pre-planned control strategy such as cutting machine and load is adopted. The traditional stability judgment methods mainly include time-domain simulation method, direct method and mixed method. The time-domain simulation method forms the mathematical model of the whole system according to the topological structure of each component ...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the traditional control idea is no longer suitable for the current power system, especially the stability control requirements of the AC-DC interconnected power system with a high proportion of power electronic devices, and the traditional control theory has not made full use of the fast and powerful control of power electronic devices. Ability to increase the balance speed of active power and reactive power of the system, which needs to be improved

Images