Development Of Real-time Voltage Stability Analysis Software And Its Application In Hunan

Static voltage stability of the power system is currently a particularly issue thatthe modern large-scale power system is confronted with and is required to keep awatchful eye on. The thesis commits to develop a type of software applicable for therapid analyzing and prevention scheduling of static voltage stability in large-scalepower system. Following that, it introduces the algorithm, structure, functions of thesoftware as well as its state of application in real large-scale grid.The thesis analyzes the significance voltage static stability research, thedefinition and content of voltage stability. Meanwhile, it elaborates voltage collapsemechanism and voltage stability safety index, as well as introduces the calculationmethod of load margin in case of faults. And spontaneously by contrasts, a variety ofresearch methods for the analysis of current static voltage stability are presented.By bring the application of current voltage stability analyzing method in realsystem into consideration, reviewing speed and precision requirements for real-timeanalysis, this thesis, anchored on the combination of sensitivity restriction and localcurve fitting, raises a method that can detect collapse point rapidly, which isempowered with adaptability to load margin step selection and with capacity to detectcollapse point rapidly and precisely. Furthermore, in the aspect of prevention module,the thesis, grounded on the optimizing of generated power distribution factor, comesup with a method of raising system load margin that setting minimum systemcontrolling cost as the objective function, N-1load margin and current voltage ofoperating nodes as the constraint condition, and then forming a linear programmingmodel to achieve prevention scheduling strategy which stabilizes and secure thesystem power system.Based on the rapid analytic algorithm for static voltage stability and optimizedprevention scheduling model, the writer researches and develops a set of softwareserving for Online Voltage Stability Rapid Analyzing and Prevention Scheduling. Thesoftware has automatic calculation module and customer calculation module, amongwhich the first one is capable of acquiring the latest EMS data for the analysis ofsystem static voltage stability and generating immediate analytic data. It can, whenencountered with significant fault, automatically start prevention scheduling functionand offer the prevention scheduling strategy of the minimum scheduling cost. And the second one, customer calculation module, can modify primary data according to therequirement of analyst. Moreover, it can adjust the manner in which load grows andmotor schedules, set initial conditions such as preconceived routes and faults oftransformer, as well as conduct detailed analysis of ground state and static voltagestability under fault condition.This thesis introduces the technical processes during the period of softwaredevelopment and functions of all modules and software user interface. With the realEMS data of IEEE-30、IEEE-118and IEEE-300system and Hunan Electric PowerSystem added in the research, the software is empowered to process an exampleanalysis to the static stability of Hunan Grid, which in turn harvests the information ofHunan system margin and weak node, and measures the sensitivity reacted frompower equipment, such as generator, towards margin.