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In this paper, a new control strategy for a low cost series connected single phase PV module inverter is introduced that delivers full PV power (at MPPT) to the load together with voltage compensation. The inverter operates during the day time as an active power compensator as well as load voltage regulator under grid voltage sag, swell or even under normal condition. The compensating voltage provided...
Cerebellar model articulation controller (CMAC) has been already validated that it can approximate a nonlinear function over a domain of interest to any desired accuracy. This paper proposes an adaptive CMAC (PIACMAC) system with a PI-type learning algorithm. The PIACMAC system is composed of a CMAC and a compensation controller. CMAC is used to mimic an ideal controller and the compensation controller...
A gain-scheduling control scheme produces a nonlinear global controller from a series of local controllers tuned at specific operation points. A major problem on the design of gain scheduling controllers is the design and implementation of the switching logic to have a smooth plant response all over the operation range. This point is solved with the application of fuzzy logic, which maintains advantages...
This work presents a reset/hybrid control application of an in-line pH process. The nonlinear process dynamic is linearized around different operation points, and as a result a second order plus dead time (SOPDT) plant with uncertain gain is obtained for control purposes. A standard PI compensator and a reset compensator are designed and tuned. The main result of this work will be to compare the performance...
This paper proposes a novel control method for operation of a DFIG-based wind generator under unbalanced stand-alone loads, connected directly with stator terminal of the generator. The effect of unbalance condition at loads causes torque pulsations on generator and the stator voltage unbalance that degrade the dynamic behavior of control system. To eliminate the negative sequence components existing...
There are many important applications in printed electronics and publishing industries that use the principle of roll-to-roll manufacturing to make devices at high speeds with lower cost. Web velocity and tension control algorithm plays an important role in improving the quality of product in mass processing of using roll-to-roll web technology. Most algorithms proposed in recent years use PI or PID...
A double-loop control system based on human-simulated intelligent control (HSIC) is designed using a mathematical model of a brushless DC motor (BLDCM). In the double-loop motor control system, a conventional PI controller is implemented for the current loop and an HSIC speed controller using the characteristic model-based multi-mode control is adopted for the speed loop. The controller parameters...
Approximate dynamic inversion (ADI) has been established as a method to control minimum-phase, nonaffine-in-control systems. Previous results have shown that for single-input nonaffine-in-control systems, every ADI controller admits a linear proportional-integral (PI) realization that is largely independent of the nonlinear function that defines the system. This paper extends these previous results...
This paper proposes two new optimization algorithms for the optimal design of PI controllers dedicated to a class of second-order plants with integral component and variable parameters. The sensitivity analysis with respect to the parametric variations of the controlled plant is supported by the derivation of sensitivity models. Several objective functions are defined based on the augmentation of...
Taking unfinished parts, that is, parts' work-in-progress (WIP), as the background, the PI control algorithm is proposed to apply for WIP control in discrete production systems and the cascade control of PI controllers is suggested. Designing of PI controllers is transformed into an optimization problem on the frequency domain, so as to guarantee the stability and robustness of PI controllers' parameters...
The nonlinear PI parameter adjustment method by RBFN was considered in this research. When the decision of the parameter of the controlled object with a nonlinear characteristic changed the target value by doing by RBFN, an excellent result was obtained. The adjustment method of the intermediate value of the hidden layer of this RBFN is scheduled to be considered in the future.
This paper presents a set of controllers for TCP/IPv6 networks. These controllers are developed from the traditional proportional integral controller, and can support differentiated quality of service requirement of the end users. Those requirements are labeled in the IPv6 header of the packets, checked by the controllers upon their arrival to the routers, so as to provide guidance to further dropping...
Theoretical analysis and experiments have shown that TCP can become oscillatory and prone to instability in high bandwidth-delay-product networks. XCP was proposed to overcome these shortcomings by advertising an explicit window adjustment from the routers to the sources. However, XCP may under-utilize the bandwidth in a multi-bottleneck network and cause some flows to receive an arbitrarily small...
This paper studies how to design a congestion controller in TCP/AQM networks. In Hollot et al. (IEEE Trans. on Automatic Control, Vol. 47, No.6, 2002), the congestion controller is conservatively designed due to using the linearized model of the TCP/AQM networks in which a structured time-delay related term is treated as an unstructured uncertainty. Without treating any time-delay related term as...
In 1987, Eitelberg introduced a useful method by adjusting the input weighting factors to recover system response when a direct tuning of the PI(D)'s parameters was prohibited from adjustment. Because of minimum interruption to an original control system, the Eitelberg's method has been extended to various applications. From previous applications, it was found that the P-element input weighting factor...
The main problem for variable speed constant frequency wind power generation system is how to improve the dynamic respond as well as stability. In this paper, according to mathematical model of wind power generator and active power separate control strategy with reactive power, PI controller and fuzzy controller were used separately in the control link of active power. And active power fuzzy controller...
This paper presents the design, implementation and analysis of a PLC-based self-tuning PI-fuzzy controller for linear and non-linear drives control. The controller consists of two fuzzy logic blocks, main and gain tuning, respectively. The main fuzzy block acts as a speed controller, while the gain tuning block scales the output of main fuzzy. The output gain tuning has the same inputs as main fuzzy...
In this paper the nonlinear average current control for a DC to DC buck converter is presented in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The outer voltage controller uses a PI controller. In this control scheme, switch current is being sensed instead of inductor current. Average of inductor current, output voltage with line and load regulation is being controlled...
This paper proposes an original development method for low cost fuzzy control systems dedicated to a class of servosystems. The controlled plants in these systems can be characterized by second-order dynamics with integral type. The controller part in these systems is represented by attractive two-degree-of-freedom PI-fuzzy controllers. The method is based on using the linear case results expressed...
A kind of fractional-order PIalpha controller is considered. Controller structure with two modes is presented, active status of two modes and mode switching are described. The Tustin operator is used for digital realization of the fractional-order PIalpha controller. Different approximation order is discussed to get a tradeoff between approximation precision and complexity of discretization expression...
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