Research On Undervoltage Load Shedding Based On Thevenin Equivalent

The electrical power system accident or the natural disaster can cause tie line split, will form the local electrical network orphaned net movement. If this orphaned net in split to receive carries the system, Xie Liehou the system load demand is bigger than not the small power source to be possible far to provide the electric power support, will cause the voltage to be somewhat low, if this kind of phenomenon will continue, possibly will cause the voltage jitter, will collapse, will thus have the huge social negative influence, the economic loss, will harm the personal safety. For can provide the essential energy safeguard in the urgent time, and provides the condition after the incorporation, the orphaned net's security steady operation is very important.This article through moves to the orphaned net when south the systematic load node output, the node voltage, David the equivalent darameter carries on the analysis, had pointed out the orphaned net moves when the voltage somewhat low phenomenon appears the basic reason proposed that has reduced by the load node carries the achievement to avoid the voltage jitter the effective action. Therefore this article analyzes south David the equivalent darameter computational method, proposed speeds up calculates south David the equivalent darameter computation speed way; The union load node related characteristic diagram of curves, proposed that the voltage regulation power factor's concept, takes the determination voltage regulation or not criterion, thus analyzes the determination system stable degree according to the voltage regulation power factor, after is reduces carries the place, the opportunity and so on determination, provides the rationale.Shoulders the supervisory control to take the basic low pressure to reduce carries the method, to reduced carries questions and so on node, opportunity and quantity has carried on the discussion, and based on this, proposed the load supervisory control benefit took to the low pressure reduces carries the economic efficiency the appraisal.This article designed the orphaned net movement low pressure to reduce carries the analogous system, and carried on the test by the electrical network actual data to it, simulated the orphaned net movement low pressure to reduce carries the entire process, spoke by the fact, confirmed this article stated the voltage regulation criterion with to reduce carries the measure to maintain the orphaned net safe steady operation aspect the validity and the feasibility.