A DC Power Energy Area Compensation Method Based on Local Information of Converter Station

Abstract

The invention provides a direct-current power energy area compensation method based on converter station local information. The method comprises the following steps of: judging whether a direct-current power energy area compensation function needs to be started; calculating direct-current power energy compensation quantity; and calculating a direct-current power energy compensation area after an alternating-current fault. The invention aims to improve the frequency and voltage recovery characteristics of an alternating-current system after a fault and do not rely on safety control and coordination control devices of remote measured signals and system layers, the direct-current power compensation quantity and the continuous time of an on-line adjusting system deceleration area can be accurately calculated based on the converter station local information, an oscillation process is inhibited after the alternating-current system on a rectifier side fails seriously, and the stable state recovery of the system is accelerated; and with regard to an alternating-current fault on an inverter side, the frequency and voltage recovery characteristics of the system are improved, and continuous commutation failures are avoided.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a DC power energy area compensation method based on local information of a converter station. Background technique [0002] With the rapid development of DC power transmission in my country, the proportion of UHV large-capacity DC feed-in or transmission is getting higher and higher, and the coupling relationship and mutual influence between AC and DC systems are becoming more and more significant. When a serious fault occurs in the AC-DC system, it may cause The system continues to oscillate or become unstable. The researches that have been carried out in the past have mostly focused on two aspects. One is the AC-DC coordinated control using the DC power modulation function. The algorithm is relatively complex, and it needs to rely on the system layer for communication when it is implemented. There is a certain delay, and it needs to be independently developed t...

AI Technical Summary

Problems solved by technology

In this example, due to the poor recovery of the AC voltage, it is difficult to recover the DC power, and the generator and the DC system cannot provide enough deceleration area, resulting in the failure of the system to resume stable operation after the fault is cleared.

Images