Method for evaluating weak voltage area of direct-current receiving end alternative-current system based on dynamic tracking

• Main Authors: BAI LIANGJUN, DAI FEI, ZHANG YIMING, CHANG GUANGHUI, XU XIALING, SUN RAN, AN JUN, JU PING, HAN JINGDONG, CHEN QIAN, ZHOU HAIQIANG, XIONG HAOQING, CHEN JUN, HAO JUNJIE
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2017
• Subjects: CALCULATING; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; COMPUTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; ELECTRICITY; GENERATION; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR

The invention discloses a method for evaluating a weak voltage area of a direct-current receiving end alternative-current system based on dynamic tracking. The method comprises the following steps: 1, based on a WAMS (Wide Area Measurement System), extracting and counting voltage fluctuation waveforms of recent abnormal fluctuation information, confirming a frequent voltage fluctuation area, and calculating a voltage abnormal fluctuation level coefficient C1 of the area; 2, in a normal operation mode, calculating a voltage stability level coefficient C2 of a direct-current receiving end system; 3, calculating a voltage stability level coefficient C3 of the direct-current receiving end under the condition of line fault disconnection; 4, sequencing line faults; 5, integrating C1, C2 and C3 to form a superposition equation, and providing voltage stability grade levels R=C1/(C2+C3) of different sub-areas, and determining that a sub-area is a dangerous area if R is greater than or equal to 0 and less than or equal