Commutation failure risk assessment method considering mutual influence of inverter stations
A commutation failure and risk assessment technology, which is applied in the field of commutation failure risk assessment considering the mutual influence of inverter stations, and can solve the problems of inaccurate evaluation results and inability to study commutation failure transmission defects.
Inactive Publication Date: 2019-07-12
STATE GRID CORP OF CHINA +2
View PDF4 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that the evaluation results are inaccurate and cannot study the transmission of commutation failure, and provide a commutation system that considers the mutual influence of inverter stations with accurate evaluation results and can study the transmission of commutation failure. phase failure risk assessment method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0090] see figure 1 , figure 2 , this embodiment takes a double-infeed DC transmission system as an example to introduce a commutation failure risk assessment method that considers the mutual influence of inverter stations in this design. The method includes the following steps:
[0091] (1) Calculate the commutation voltage variation caused by the AC system fault
[0092] When the ground fault occurs on No. 2 commutation bus, the voltage amplitude variation of No. 1 commutation bus is:
[0093]
[0094] In formula (9), ΔU 2 is the voltage variation of No. 2 commutation bus, U 20 is the voltage of the No. 2 commutation bus before the AC system fault, is the mutual impedance between the two converter buses in the node impedance matrix Z before the AC system fault, is the equivalent self-impedance of No. 2 commutation bus, Z f is the grounding impedance when a three-phase grounding fault occurs on the converter bus of inverter station 2;
[0095]Considering that the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a commutation failure risk assessment method considering the mutual influence of inverter stations. The method comprises the steps of (A) calculating a set of inverter stationswith commutation failures due to an AC system failure, (B) calculating commutation failure components injected into a receiving end AC system by failed inverter stations according to a switching function method, (C) obtaining a fundamental frequency component and a third harmonic component which are main components of commutation failure current components based on dynamic phasor method, (D) calculating the change condition of commutation bus voltage of an inverter station without a commutation failure under the influence of an AC system failure and the commutation failure components, and (E)judging whether each inverter station has a commutation failure in a multi-infeed high-voltage DC power transmission power according to a commutation area integration method. According to the design,the evaluation result is accurate, and the commutation failure transmission can be studied.
Description
technical field [0001] The invention relates to the field of commutation failure research of traditional DC systems, in particular to a commutation failure risk assessment method considering the mutual influence of inverter stations. Background technique [0002] DC transmission technology has been widely used. At present, the East China Power Grid and the Southern Power Grid have formed a multi-infeed AC-DC system. The mutual influence of the AC-DC interconnection grid is becoming more and more serious, and the operating characteristics of the grid are becoming more complex. The voltage sag generated by the grounding fault of the AC system will cause the commutation bus voltage of the multi-circuit UHV conventional DC inverter station to drop, which can further lead to commutation failure or even blockage of the DC system. The active and reactive power impacts brought by UHV DC commutation failure / blocking to the receiving-end grid will further lead to various security and...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 张东寅范志华许汉平苗世洪乔立杨炜晨魏聪胡婷王怡聪曹倩倩童雅芳阮博熊炜
Owner STATE GRID CORP OF CHINA