STATCOM (Static synchronous compensator) based auxiliary control method for emergency state of electric power system

Abstract

The invention belongs to the technical field of safety and stability control of an electric power system and particularly relates to an STATCOM (static synchronous compensator) based auxiliary control method for an emergency state of the electric power system. The method specifically comprises the following steps: power grid running data is collected, frequency and voltage of a node where a failing STATCOM is located are detected, frequency and voltage change ratios are calculated, and the transient instability type is judged; when the electric power system has frequency dominated transient instability, the STATCOM is adopted to absorb reactive power, and voltage of part of nodes is reduced, so that the frequency stability of the electric power system is improved by reducing active power shortage of the system. If a reactive power regulation requirement exceeds the reactive capacity range of the STATCOM, the STATCOM is applied to the greatest extent and other emergency control means are adopted to cooperate with the STATCOM reactive regulation, so that stable running of the electric power system is guaranteed. The STATCOM using rate is increased, and safety and economy of the emergency control method are both taken into consideration.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control, and in particular relates to a static synchronous compensator-based power system emergency auxiliary control method. Background technique [0002] In recent years, my country's power grid is developing towards a large-scale interconnected system, and the structure of the power grid has undergone major changes compared with the original isolated power grid. The scale of large-capacity power plants in the system becomes larger, the transmission distance of the interconnected system is longer, and the power generation and consumption of local power grids are unbalanced, forming an obvious sending-end power grid and receiving-end power grid. The removal of large-capacity power plants or high-power transmission lines will cause the problem of unbalanced active and reactive power in local grids, especially for the receiving end grid, which will cause the frequency and ...

AI Technical Summary

Problems solved by technology

[0004] (1) Decoupling control: The cost of decoupling control is relatively high. Generally, when other emergency control methods cannot effectively ensure the transient stability of the power system, the power system is decomposed into island grids for control

The disadvantage of this method is that it is difficult to find the ideal decoupling point in the actual power system, and the existence of multiple decoupling points in the complex power system also brings problems to the selection of decoupling points

[0010] Despite these emergency control methods, blackouts caused by frequency and voltage collapses still occur from time to time. The reason is that various emergency control strategies have certain limitations.

Generally speaking, for the emergency control method of power system, there is still a lack of emergency control auxiliary measures that take into account both safety and economy.

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