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This research proposes poleplacement approach to achieve adaptive control design of band-pass digital filters. Digital control concept is deployed in the design scheme for practical computer control use. Frequency transformation is current well known skill to transfer low-pass prototype filter into another desired filter. It is a mathematical methodology to have the passband change. Here, poleplacement approach is used to shift poles of the original low-pass prototype filter to the desired poles location so that a new filter which has the desired passband and the desired cut-off frequency can be obtained. This control process provides the filters potentially possessing adaptive performances. The filter responses of frequency transformation and the responses of poleplacement control approach are also compared to show the feasibility of this design. Key words: adaptive, digital, band-pass filter, control design, poleplacement.

A new sensitivity factor which is called ZBUS distribution factor (ZBDF) to calculate active and reactive three-phase line flows for distribution automation is proposed in this paper. This method is associated with both the changes of individual phase-active and reactive power injection at each bus into the three-phase real and reactive power line flows. Hence, the proposed ZBDF reflects load changes to the line flows, while the loading conditions change from the base case loads. Accordingly, the existing implicit ZBUS Gauss method is applied to solve for the base case three-phase power flow (TPPF). Based on the power flow solutions, the ZBUS matrix, the primitive line impedance, and the changes of the individual phase-active and reactive power at each bus, the three-phase line flows for distribution automation are determined accurately and rapidly from the presented method without any iteration. Finally, a sample system is used to verify the developed approach. The numerical simulation results demonstrate that the proposed method not only provides high-speed computation, but also can be applied to distribution automation.

This paper develops an optimal robust control algorithm for finding digital computer control of decentralized stochastic singularly-perturbed large-scale actuator type systems with multiple time varying delays. Due to the derived algorithm concerns at each moment, the found controller is also suitable in the time varying condition. Moreover, this system possesses the fast response characteristics of the subsystems. The system order can be reduced and the analysis process can be simplified. . This noise-disturbed, time varying and multiple delay system can be often seen in practical computer controlled large-scale systems such as electric power systems, communication networks, cyber networks, and aerospace systems. Finally, the optimal cost is also obtained.