Transient voltage control method

Abstract

The invention discloses a transient voltage control method. The method can quantitatively evaluate transient voltage stability based on transient voltage stability margin index, and combines improvedvoltage reactive trajectory sensitivity to optimize a reactive configuration scheme of an AC / DC receiving-end power grid. The method comprises the following steps: to begin with, in combination with voltage stability requirements of a power system for a load bus and a pivot bus, limiting transient minimum voltage and steady-state recovery voltage levels, and for the idea of assigning different weights according to different drop degrees, constructing a transient voltage stability margin index based on a multi-binary table; then, proposing a voltage stability support (VSS) index for the condition of a multi-direct-current feed-in receiving-end power grid, and screening a candidate bus for reactive power compensation; then, improving the voltage reactive track sensitivity index by utilizingthe transient voltage stability margin index; and finally, providing an AC / DC receiving-end power grid dynamic reactive power optimization configuration scheme combining the improved voltage reactivepower track sensitivity and the transient voltage stability margin index.

Description

technical field [0001] The invention relates to the technical field of power system operation control, in particular to a transient voltage control method. Background technique [0002] With the implementation of the West-to-East power transmission strategy, my country's power system has entered the era of large power grids, large units, and long-distance power transmission. The scale of distance transmission continues to increase. Through the UHV DC transmission project, the power of the large thermal power base, the large wind / solar new energy base, and the southwest large hydropower base will be fed into the load center centrally, forming a multi-DC feed into the receiving-end power grid. The characteristics of "strong direct and weak alternating current" of the receiving end power grid are prominent, and the problem of transient voltage stability is more serious. HVDC transmission consumes a large amount of reactive power while transmitting active power, which will brin...

AI Technical Summary

Problems solved by technology

However, due to the nonlinearity of system components, the time-domain simulation method is computationally intensive and time-consuming

The energy function method judges the stability of the system by calculating the difference between the system energy and the critical energy after a fault. However, it is difficult to construct the energy function and determine the critical energy in a complex system that conforms to the Lyapunov criterion.

The nonlinear dynamics method mainly refers to the bifurcation theory. Due to the change of system parameters, the structural stability of the system changes, which is manifested as the disappearance of the structural stability of the system. However, how does the nonlinear dynamics method be applied to the temporary situation of the actual power grid? State voltage stability analysis needs to be perfected

Practical transient voltage stability criteria are still lacking

Images