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A decentralized control strategy with improved droop control is proposed for parallel-connected current-fed bidirectional DC-DC converters to achieve the flexible power architecture and modular design. The step-up or step-down function depends on the power flow direction. An improved droop control strategy is implemented by sensing the high-voltage side (HVS) voltage and low-voltage side (LVS) current...
Stability analysis in non-integer order systems is a complex issue and requires detailed analysis. This paper aims to show the stability region for fourth order system with noninteger PDÄ controller. Such system was analysed with use of Ddecomposition method. Moreover, we presented stability analysis for implementation in optimization procedure based on system in of form of fractional differential...
This paper is an extension of previous work, where authors developed a nonlinear model and its linear approximation of bicycle (or single track vehicle generally) with controlled moment gyro (CMG) used for stability algorithm in vertical direction. Also, simple stability was proposed. This extension focuses on robustness of control.
The attitude autopilot and the velocity orientation autopilot of the flying vehicle swerve phase are designed and compared in this paper. The analysis result shows that the response speed of the velocity orientation autopilot is far faster than the attitude autopilot by reasonably designing, and the stability of the velocity orientation autopilot is better than the attitude autopilot.
In this paper, on-chip interconnects based on Cu-single-walled carbon nanotube (SWCNT) composite are studied using transmission line model. The transfer function is obtained and approximated by a linear parameter expression. The relative stability analysis of Cu-SWCNT composite interconnects is carried out by the Nyquist criteria.
Disturbance observer(DOB) has been known as a simple robust control method to reject disturbances. Design of Q filters is considered as the most important design technique for the DOB design to compensate for the possible improperness of the inverse model of the plant as well as a non minimum phase. Many efforts on Q-filter design have been accomplished to realize a stable filter for the inverse of...
This paper presents the disturbance rejection of peak current-mode control for bidirectional Buck-Boost converter using slope compensation. The equivalent circuits and transfer functions are derived for the peak-current mode control using small signal modeling. In order to utilize the benefits of peak current-mode controller and eliminate its drawbacks, slope compensation has been added. The derived...
This work is a study on left-invariant, drift free optimal control problem on H(3) Lie group. The control objective is to minimize the cost function and steer the system in non-ideal environment. The stability of the resulting dynamics has been studied and PID controllers have been designed at the equilibrium points.
In this paper, we study system performance in passivity based control designs. In particular, we consider the passivation method of [1], we extend it so to use non-positive passivation parameters and transfer functions, and present results to passivate systems that are not finite-gain stable. The passivation parameters are selected according to non-derivative based optimization methods when the system...
We introduce a novel distributed control architecture for disturbances attenuation in heterogeneous platoons of linear and time-invariant autonomous agents that inherits the performance achievable by the leader-follower control policies. We provide a Youla-like parameterization for the class of all distributed controllers such that the sparsity constraints are imposed on the controllers' left coprime...
This paper concerns with the typical problem of disturbance rejection in process control in the presence of time-delays and, possibly, the integrating or unstable dynamics. It is shown how unknown disturbance can be rejected actively in the absence of detailed mathematical model of the process. Disturbance rejection ability and stability are analyzed using the language of frequency response engineers...
In this study, fractional order indirect model reference adaptive control method is used to control a class of fractional order systems. Unlike the traditional integer order case, the controller is obtained by Lyapunov method and the closed-loop stability is achieved via indirect Lyapunov method rather than the certainty equivalence principle. Moreover, for the knowledge that the fractional order...
In this paper, the synchronized output regulation (SOR) problem of leader-following homogeneous linear networked systems aiming at tracking periodical signals is investigated. Only the output information of each agents is delivered throughout the communication network described by undirect graphs. For tracking a general periodic signal consisting of lots of sinusoid functions, the dimension of the...
A method for multi-mode stability analysis of power amplifier is presented which does not demand strict circuit symmetry. Transformation from n-port signals to n-mode signals is used to provide the oscillating signal's “mode” information which allows the circuit designer to find the instability source and to adopt suitable methods for circuit stabilization. The proposed method has been applied to...
Tuning non-integer order controllers is one of the problems in modern control theory. One of the questions which need addressing is how to calculate performance indicator without finding the solution of the non-integer order system. This paper shows how to calculate the indicators using Laguerre Impulse Response Approximation method along with optimization algorithm. We show theoretical analysis of...
This paper proposes a dual-loop control strategy using a robust controller for the emerging planar switched reluctance motor (PSRM) to achieve precise positioning. The mechanical structure and transfer functions with known parameters obtained via a forgetting factor recursive least-squares algorithm of the PSRM are first presented. Then, the description of the control strategy, the depiction of the...
In this paper, we propose an alternative frequency-domain interpretation about bounded realness and norm evaluation in the linear time-invariant (or simply LTI) multi-variable continuous-time feedback configuration setting. The technique can be implemented numerically as well as geometrically by means of a class of generalized Nyquist loci without open-loop unstable pole distribution, locus orientation...
The subject discussed in the paper is the special purpose power electronics converter that fundamental task is generating an output current being precisely mapped in a reference input signal. The estimated generator output power is equal to 1 kW. The main expected application area of this one is a high power ATE (Automated Test Equipment). The paper presents the conception of the generator and selected...
This paper proposes an application of the current using its advantages in harmonic signals generation. Using current-conveyors in harmonic oscillators building, the frequency band of active device is well valorised, comparing with the situation of operational amplifiers using. The author chooses from all RC oscillators the oscillator with Wien network, as one of the most used net for RC oscillators...
The main operation of power system stabilizer (PSS) is to provide optimal damping which is in phase with the rotor oscillation. In this paper the effect of the transient gain reduction (TGR) on the damping performance and the electromechanical torque components in power system with PSS is proved. The tuning of PSS parameters are computed using phase compensation technique (PCT). Several simulations...
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