Using the conformal compensator superfields of N=2 D=4 supergravity, the Type IIB S-duality transformations are expressed as a linear rotation which mixes the compensator and matter superfields. The classical superspace action for D=4 compactifications of Type IIB supergravity is manifestly invariant under this transformation. Furthermore, the introduction of conformal compensators allows a Fra...

This paper discusses the design of a compensator for the buck DC switching converter. Three different compensators are designed and analyzed based on phase and gain margins. Op-amp implementations for each compensator are derived and tested with an example converter. The performance of the converters is examined based on transient response and rejection of steady-state error due to a step chang...

The paper focuses on the stiffness modeling of robotic manipulators with gravity compensators. The main attention is paid to the development of the stiffness model of a spring-based compensator located between sequential links of a serial structure. The derived model allows us to describe the compensator as an equivalent non-linear virtual spring integrated in the corresponding actuated joint. ...

Presented is a two step windup prevention scheme with proven stability for observer based compensators possibly containing signal models for disturbance rejection. If the undesired effects of input saturation can solely be attributed to badly damped or unstable compensator dynamics (controller windup), they are prevented by simple structural measures not increasing the compensator order. Only i...

This paper studies the antiwindup synthesis problems for plants with coprime factor uncertainties. The proposed technique utilizes an equivalent framework of compensated systems to investigate the robustness of the antiwindup compensators. The penalty operators of the input saturation are studied originally in general cases. Robustness criteria are proposed for an antiwindup compensated system ...

This project presents reactive power compensation in a distribution power system. DSTATCOM (distribution static compensator) is a reactive power compensator for power quality improvement in a three phase four wire distribution system. A voltage source converter (VSC) based DSTATCOM with a zig-zag transformer is used for the compensation of reactive power for voltage regulation along with load b...

This paper describes a practical control method for nanometer level point-to-point positioning (PTP) using a conventional ballscrew mechanism. nominal characteristic trajectory following controller (NCTF controller) is used for the ultra-precision positioning. The controller design, which s comprised of a nominal characteristic trajectory (NCT) and a PI compensator, is free from exact modeling ...

First-order necessary conditions for quadratically optimal, steady-state, fixed-order dynamic compensation of a linear, time-invariant plant in the presence of disturbance and observation noise are derived in a new and highly simplified form. In contrast to the pair of matrix Riccati equations for the full-order LQG case, the optimal steady-state fixed-order dynamic compensator is characterized...

A fuzzy controller for multivariable systems based on fuzzy controllers for the decoupled monovariable subsystems and a fuzzy compensator of the interactions is introduced. The fuzzy compensator acts as a feedforward controller. It has as inputs the outputs of the monovariable controllers considered as known perturbations and produces compensation signals which are added to the single loop cont...