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With increasing integrations of large-scale systems based on permanent magnet synchronous generator wind turbine generators (PMSG-WTGs), the overall inertial response of a power system will tend to deteriorate as a result of the decoupling of rotor speed and grid frequency through the power converter as well as the scheduled retirement of conventional synchronous generators. Thus, PMSG-WTGs can provide...
Phasor Measurement Units (PMUs) utilize three-phase current and voltage transformers to obtain input signals from which the phasors are estimated. In general the instrument transformers have Ratio Correction Factors (RCFs) which can be determined by conducting on-site calibration tests. These calibration tests are expensive and time-consuming and rarely performed on a system-wide basis. The errors...
In a high-mixed production environment, printed circuit board manufacturers face the challenge of frequent setups which involve rearranging the feeders on the machines. To reduce the setup cost, different boards can be assembled with a common feeder arrangement. This paper focuses on the optimization problems arising in this situation. Decisions are to be made on how different component feeders are...
This article studies a unique feature of the binomial CUSUM chart in which the difference (dt - d0) is replaced by (dt - d0)2 in the formulation of the cumulative sum Ct (where dt and d0 are the actual and in-control numbers of nonconforming units, respectively, in one sample). The results of the performance studies reveal that this new feature is able to increase the detection effectiveness when...
A computer-based model for analyzing air/gas system dynamics has been developed. A set of generic elements are interconnected by generalized junction structures to represent a variety of system configurations. The response of pressure, flow, temperature and heat transfer rate at any point or station in a system is then determined due to a wide range of fluid, thermal and mechanical disturbances. The...
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