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This paper discusses an adaptive algorithm to control a magnetorheological fluid vibration isolator operating under varying frequency of the vibration source. The algorithm provides automatic tuning of the isolator properties by controlling the viscosity of magnetorheological fluid in the throttle channels. This ensures efficient damping and vibration protection at the main harmonic of a varying vibrational...
This paper analyzes the interaction effect among multiple static var compensator-based damping controllers (SVC-DCs). The overall system is divided into the SVC-DCs and the external system for studies. Theoretical analysis indicates that the increase of the gain of a SVC-DC may cause an unstable control mode oscillation, and installation of another SVC-DC may cause destabilizing interactions between...
This paper describes a method for the highprecision and fast measurement of the damping of a linear oscillator by using harmonic vibrations. The measurement is based on the evaluation of the vibration frequency that corresponds to a specific phase shift. A phase-locked loop controls the phase shift using the excitation frequency as control signal. Since the dynamics of the frequency adjustment is...
Grid connected solar inverters are used to feed energy generated by a photovoltaic generator into the mains. High efficiency is a major requirement. Furthermore a low total harmonic distortion (THD) of the output current is needed to comply with regulations. This paper presents the control for a new highly efficient inverter topology. Due to disturbances of the grid voltage and non-linear effects...
In this paper, a system with two ties (AC and DC), interconnecting two large AC networks, is studied. The system includes DC control interacting with the conventional AC area controls. In this article, the stability of the network in each of the areas is controlled by two control methods. One of these methods is the model reference adaptive control method (MRAC) based on the combination of linear...
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