Research Of Reasons And Governance Measures Of Reactive Power Compensation Capacitor Fault On Feeder

The principle of reactive power compensation is local partition balancing. Shuntcapacitor is commonly used for such purpose. However, damage often occurs in shuntcapacitor banks installed on the public network distribution feeders, which causes economyloss and seriously degrades the reliability and quality of the power distribution network. Thestudy on the causes of such failure has great value for both fundamental science and practicalapplications.This thesis is organized as follows. First, the types and characteristics of the fault infeeder reactive power compensation capacitors are summarized. Second, the existingtechniques of power compensation capacitors are analyzed and summarized. Third, based onthe characteristics of the faults that have occurred in the electric power system capacitors inChina, the causes of the failures are discussed. Fourth, a technique that adopts three-phaseshunt voltage suppressor on the feeder to limit the feeder overvoltage, which is based oninstantaneous power theory, is proposed. Last, a three-phase three-wire active power overvoltage suppressor using constant instantaneous power control strategy is constructed inMATLAB/simulink environment, and a practical10kV three-phase feeder model is built tosimulate the resonance over-voltage fault. Active Power Shunt Voltage Suppressors areinstalled on10kV three-phase feeder model, which is used to verify the correctness ofsuppression measures proposed in this thesis.Finally, the strategy of installing over-voltage suppressors on three-phase feeder tosuppress the feeder overvoltage is verified by theoretical analysis and simulations.