Online decision method for emergency control and correction control of ultrahigh voltage DC receiving-end grid

Abstract

The invention discloses an online decision method for emergency control and correction control of an ultrahigh voltage DC receiving-end grid. The method is characterized in that coordinate control measures include direct current emergency boosting control, pumped-storage pump switching control and accurate load control for a DC blocking fault of causing large power shortage of the ultrahigh voltage DC receiving-end grid; and the online decision method comprises the steps of before the fault, considering stability constraints of relevant AC sections according to a DC operating state, calculating the emergency boosting capacity, as shown in the specification, of DC power in real time, monitoring the operating conditions of various pumped-storage units, recording the total capacity, as shownin the specification, of switchable pumped-storage units, collecting interruptible load data and calculating the total amount, as shown in the specification, of interruptible loads; and after the fault, coordinating direct current emergency boosting control, pumped-storage pump switching control and accurate load control from two aspects of frequency emergency control decision and section overloadcorrection control decision.

Description

technical field [0001] The invention relates to the technical field of power system operation control, in particular to an online decision-making method for emergency control and correction control of an UHV DC receiving end power grid. Background technique [0002] With the increase of UHV AC-DC cross-regional transmission capacity, the coupling between AC-DC transmission and receiving-end power grids is becoming increasingly tight. Once a DC blocking fault occurs, the frequency of the power grid will drop rapidly, and the system may enter an emergency state. Complex faults may cause Large-scale power outages or stabilization accidents in the power grid. In addition, due to the strong DC and weak AC characteristics of the UHV AC-DC hybrid grid, single faults such as single DC, multi-DC blocking faults, and DC blocking faults caused by 500kV AC grid overload and low voltage levels have transformed into cascading faults and local disturbances The problem of extending to glob...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an online decision-making method for emergency control and correction control of the UHVDC receiving-end power grid, which solves the safety and stability problems of frequency drop and transmission cross-section overrun, and eliminates the hidden danger that the existing strategy cannot meet the online mode, and improves In order to deal with the refined control level of UHV DC blocking

Images