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This paper presents a new reduction method for systems with high order transfer functions. This new technique is essentially based on the nature of the three most common output responses with no overshoot, with overshoot only or with overshoot and oscillations. The approach is based on the concept of two similar systems but not identical. This similarity is made on significant weighted elements th...Show More
The coupling among the loops is a primary challenge in MIMO processes over the SISO processes. In this work, a new Relative Derivative Normalised Gain Array (RDNGA) is proposed that be derived from the error and its derivatives. Proposed method helps in input-output paring and gives improved controller design than the existing RNGA based method that uses only Integral error to calculate the normal...Show More
Most of the modern industries have multivariable processes wherein interactions exist. As the process outputs and inputs are coupled, designing controller for MIMO processes is a challenging task. The effective open-loop transfer functions (EOTFs) between the paired process input-output variables have complex high order dynamics. While many of the decoupling control methods uses effective transfer...Show More
A decentralized active disturbance rejection control (ADRC) design method based on effective open-loop transfer function (EOTF) for multi-input/multi-output (MIMO) interactive processes is proposed. The MIMO system is decomposed into a set of equivalent single loops. The coupling effects for a particular loop from all the other closed loops are directly incorporated into the EOTF, and then, the in...Show More
The multi-objective optimal problems are usually solved with linear weight method, but each weight factor is a constant in this method. It can't respond to the interaction effects to each sub-objective in the optimization process. After analyzing the similarity between closed-loop feedback control in the control systems and the dynamic progress of multi-objective optimization calculating, the pape...Show More
Voltage regulator modules are dc-dc converters that power modern microprocessors. They must exhibit a fast dynamic response, in order to achieve satisfactory regulation performance in spite of the rapid load current variations. The pulsewidth modulator is one of the elements that determine the converter transient response. This letter introduces a dual-edge modulator that outperforms conventional ...Show More
In the total reflection prism laser gyro, the frequency stabilization accuracy of the ring laser directly affects the working accuracy of the gyro. Based on the control system theory, the transfer function of the prismatic laser gyro frequency stabilization control system is established. The equivalent mathematical model of the ring laser in the frequency stabilization control system is establishe...Show More
Analysis of complex transfer functions poles (CTFP) is formulated in this paper to complete the application of complex transfer function (CTF) in 3-phase current control analysis. It serves as a straightforward tool to directly compare and analyze the transient responses of various current control strategies implemented on different reference frames, which conventional pole analysis of real transf...Show More
A centralized PI control design methodology with easy applicability to small as well as large scale MIMO processes is proposed in this manuscript. The gain and phase margin tuning rule is deployed here to design the diagonal (D) PI controllers for the simple effective transfer function models (approximated for effective open-loop transfer functions). While accounting for the input-output coupling,...Show More
This paper presents the system modeling and analysis of the single-phase current regulation module (CRM) in continuous-conduction-mode (CCM) at steady state for use in the electrical discharge machines (EDMs). Based on the equivalent model of the three-terminal PWM switching cell, the small-signal equivalent circuit models of the single-phase CRM are obtained to derive the corresponding open-loop ...Show More
This paper presents the analysis of open-loop power-stage dynamics relevant to current-mode control for a boost pulsewidth-modulated (PWM) dc-dc converter operating in continuous-conduction mode (CCM). The transfer functions from input voltage to inductor current, from duty cycle to inductor current, and from output current to inductor current are derived. The delay from the MOSFET gate drive to t...Show More
This paper is on the design of fractional controller for a class of undamped unstable linear plants. In the absence of the adequate damping the derivative control term is necessary for controlling these class of plants. The required performance specifications of the controlled system is first represented in terms of bode loop transfer function which is actually a fractional order integrator. The o...Show More
In this paper, we investigate the correlation between optimal set of driver nodes and networked sensitivity of Complex Networked Systems (CNS). Here, we study the networked sensitivity between a pair of control and output nodes for interconnected directed and undirected networks. We investigate the importance of the optimal driver nodes based on new index of the networked control system, which is ...Show More
Open-loop transfer functions can be used to create closed-loop models of pulsewidth-modulated (PWM) converters. The closed-loop small-signal model can be used to design a controller for the switching converter with well-known linear control theory. The dynamics of the power stage for boost PWM dc-dc converter operating in continuous-conduction mode (CCM) are studied. The transfer functions from ou...Show More
The cyclically switching operation of a novel zero-voltage-zero-current-switching three-level converter is briefly presented. Based on a steady-state time-domain analysis of each equivalent switching topology, an average model is obtained. Small-signal open-loop ac line-to-output, control-to-output, and output-current-to-output-voltage transfer functions are deducted. The stability, gain margin, a...Show More
Due to environmental concern, modern science is taking more interest in renewable energy usage. Therefore, a lot of research work is going on hybrid electric vehicles, electric vehicles, solar PV modules etc. For that an efficient bidirectional converter is needed to transfer the energy in both directions. This paper demonstrates a dc/dc bidirectional SEPIC converter with Type-III and Internal Mod...Show More
With the large-scale access of renewable energy, the problem of sub-synchronous oscillation (SSO) caused by the interaction between the direct-drive permanent magnetic synchronous generators (D-PMSGs)-based wind farm and weak AC grid has attracted people's attention. Focusing on this topic, the study presents an analysis of the SSO mechanism by establishing the double input and double output trans...Show More
A Well designed power supply may not grab your attention, but the inappropriate one, definitely will. Nowadays switched-mode power supply (SMPS) are used in wide range of applications, meaning they are exposed to diverse perturbations, which can lead to undesired behavior. That’s why the good design and stable behavior of the SMPS is so critical and may be crucial for some applications. The focus ...Show More
Small signal-control models are presented for a magnetic amplifier switching-mode post regulator for SMPS applications. Two commonly used current reset schemes are considered; an external reset scheme and a self-reset scheme. It is mathematically shown that the open-loop gain is a two-pole, single-zero transfer function for continuous-mode operation and is a single pole transfer function for disco...Show More
Accurate angular control of DC motors is crucial in numerous industrial applications. The proportional-integral-derivative (PID) controller is widely employed for this purpose. However, conventional PID tuning techniques, such as trial-and-error, frequently result in overshoot and saturation issues, which degrade system performance. While advanced optimization algorithms like Genetic Algorithms an...Show More
This paper introduces phase-locked loop phase noise model, focusing on the phase-locked loop loop filter output phase noise. Through the frequency domain analysis of the linear loop model and the feedback control theory, the influence of the input reference and VCO on the output phase noise is discussed. The inhibitory effect of the loop on the input reference and VCO noise transfer is analyzed. T...Show More
The paper deals with a method to tuning the controller of a power supply for an autonomous object employed for underwater exploration. The method is based on the Real Interpolation Method for the object's transfer function identification. The error of identification does not exceed 3% with respect to the response data acquired from the object. The identified transfer function is implemented to tun...Show More
The traditional sinusoidal oscillator generally consists of RC or LC circuits, i.e, the energy-stored components of capacitor or reactor are needed as the oscillating components. In this paper, we designed a new kind of sinusoidal oscillator which consists wholly of resistance components, by means of operational amplifier. This kind of oscillator is called as R-typed oscillator.Show More
H/sub /spl infin// controller design is based upon minimizing the infinity-norm of a transfer function related to the system. Different design problems such as sensitivity to input disturbances or sensitivity to model uncertainty can be solved by using the appropriate transfer function(s). As this design procedure is norm based it does not directly account for the influence of phase and, consequen...Show More
Stability is the fundamental demand to the system. Considering the stability and dynamic response of the system, we suggest an approach to select PI values. The ranges of PI parameters are attained based on the Bode plot criteria taking account of the systems' stability. Synthetic performance indexes to measure system's dynamic response are adopted, and the proper PI parameters corresponding to th...Show More