The Fuzzy Criterion for Distinguishing Transient Power Angle and Voltage Dominance Based on Energy
Defining the transient dominant instability mode of the power system helps in the decision-making of control measures.Based on the transient energy function,an index system is established,and the fuzzy comprehensive evaluation method is used to propose the fuzzy criteria for discriminating the dominant destabilization mode.First,the energy changes of different transient instability states of the system are utilized to establish the power angle of the system.Second,also based on the fuzzy mathematical theory,the entropy weight method is used to calculate the weight of the indexes,hence the fuzzy criterion of the dominant destabilization mode is obtained.Furthermore,the transient destabilization of the two-machine single-load system is utilized to obtain the fuzzy criterion value domain within the range of 0-1.In addition,the fuzzy criterion value domain within the range of 0-1 is obtained in the actual structure of"Z"type network in a certain area.Finally,the fuzzy criterion is used to judge and verify the transient dominant instability mode in a real"Z"type network in a certain region.The experimental results show that the fuzzy criterion is reliable except in the case of strong coupled instability,and it has a guiding role in the control measures for coupling instability scenarios.
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