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Regional power grid isolated operation , a portion of the node voltage problems often occur , if not promptly treated, persistently low voltage , which may cause voltage instability , voltage collapse can cause serious , immeasurable loss . Therefore, to ensure the stable operation of isolated network is critical not only for the emergency period to restore production to provide the necessary energy security , but also provide the conditions after the grid . In this paper, isolated operation voltage characteristics were analyzed, and the low-voltage isolated operation causes . Weak node voltage load shedding is a key to determine , this article Thevenin Equivalent Parameters for classical calculation methods to improve, gives a faster parameter calculation method , combined with the characteristic curve of load nodes proposed voltage instability metrics as criteria for determining the voltage instability , effectively analyze each load nodes of the grid voltage stability , low-voltage load shedding node selected to provide a theoretical basis . Load shedding is an emergency relief Low voltage instability caused by the crisis of effective strategies , the paper load management control voltage load shedding as the basic method, the node load shedding , load shedding load shedding timing and number of other issues were discussed, and on this basis , we propose efficient load management control voltage load shedding as economic evaluation is accurate, timely, and effective voltage load shedding to provide technical support . In order to facilitate online tracking isolated network operation , can cause low voltage instability occurs immediately respond , the paper design voltage load shedding algorithm, and gives the \programs to achieve the isolated operation voltage load shedding automation . Finally , Wujiang City , Jiangsu Province, respectively, of a 63 node grid actual local zoning and two sets of data , Wujiang City, the whole network to test the system to simulate the isolated operation voltage load shedding of the whole process , confirming the isolated voltage load shedding to maintain network security stable operation 's effectiveness .
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