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This paper deals with the design of suitable control strategy for a dual input DC/DC converter. Nowadays, it becomes very essential to stabilize the output voltage of DC/DC converter for hybrid energy application. To achieve this objective, control of duty ratios of switches using different control strategies is proposed in this paper. Comparative analysis has been carried out between two control...
A DC bus control strategy of an actively-controlled battery/ultracapacitor hybrid energy storage system for a full EV is presented in this paper. The control strategy is based on the PI DC bus voltage controller, wherein the DC bus voltage target is determined based on motor voltage demand. A feed-forward load compensator is also included in order to suppress DC bus voltage excursions under highly-variable...
Control of the object with one output using many inputs is widely used for combining the advantages of every input and eliminating of disadvantages of two or more control channels. Such systems are called MISO, which means Many Inputs — Single Output. For the calculation of such systems we have proposed a theory based on the logarithmic frequency response. This method has proved to be excellent in...
This paper presents the results of research and simulation of feature automated control of a hysteretic object and the difference between automated control and automatic control. The main feature of automatic control is in the fact that the control loop contains human being as a regulator with its limited response speed. The human reaction can be described as integrating link. The hysteretic object...
in this paper, an integral sliding mode control method is proposed for maximum power point tracking MPPT voltage oriented loop. The aim is to obtain a better performance when applying it to stand alone. The proposed technique is studied and simulated by using Matlab/Simulink and simpower system packages. The obtained simulation results display significant enhancements by applying the proposed method...
This paper is dedicated to the motion control system of a multimass mechanism with occurring resonances and variable moment of inertia. The proposed concept of control structure for such mechanism consists of a filter damping higher resonance frequencies and an adaptive speed controller. The filter has properly selected fixed characteristics giving a compromised filtering effect in a range of resonance...
This paper compares a non-isolated DC/DC converter (interleaved Buck/Boost) and an isolated converter (Dual Active Bridge) in a bidirectional charging application for Electric Vehicles. Both converters are modeled, controlled using small-signal models, and their operation in several modes is simulated and then compared. The results of the comparison using several criteria related to automotive applications...
Aiming at the influence of nonlinear loads on the quality of power grid, a shunt active power filter (SAPF) topology is proposed. According to this topology, the mathematical model of the three-phase shunt active power filter is established. Based on the model, it's transfer function is deduced, and the current controller is designed on account of PI control strategy. By analyzing the limitation of...
When the problem of the model predictive control cannot be solved, the control system will not work properly. A control strategy based on model predictive control and PI is proposed in this paper. The control strategy of the model predictive control and PI is applied to the three-phase off-grid inverter. Adaptability of the PI controller to the operating mode is improved and the dynamic performance...
For engine equipped with dual switch-type oxygen sensors upstream and downstream of the Three-Way Catalyst (TWC), an innovative dual-loop control model of excess air ratio is proposed here. The front oxygen sensor is used to perform PI feedback control of the closed-loop control factor that makes λ ripple periodically in the vicinity of 1. The rear sensor is used to monitor and correct the λ drift...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
Grid-connected inverters are the interfaces for renewable energy sources into the active distribution networks. Usually typical grid-connected inverters use pulse width modulation control, resulting in the grid currents contain a lot of high-order harmonics. Traditionally, grid-connected inverters use L filter to eliminate the harmonics. And in grid-connected inverters' AC side, it uses LCL filter...
In this paper, adaptive interval type-2 fuzzy proportional integral (PI) control scheme to attenuate fast and large disturbance for a class of uncertain nonlinear time delay systems is proposed. By incorporating adaptive interval type-2 time delay fuzzy logic controller (AT2DFLC) with PI controller, not only the typical switching law chattering can be significantly attenuated but also the instability...
For systems with variable gain, proportional plus integral controllers need to be tuned in the highest gain state of the system. This can lead to sluggish response when the system is in a low gain state. Previous research has shown that error modulated state setting control can be used to improve the transient response of variable gain systems. Errormodulated state setting controllers smoothly combine...
The unified power flow controller is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the control and optimization of power flow in electrical power transmission system. In this thesis the control of real and reactive power flow through a transmission line with the use of UPFC at the sending end is investigated. Computer simulation using...
Electricity industries are being transformed worldwide, driven by the need for more energy, urbanization, scarcity of natural resources and global warming. Building a safe, reliable and highly stable power grid system has become an inevitable trend. The smart grid came into being therefore. Automatic control is an advanced modern communication technology. Automatic control system can improve network...
In this paper, a double-loop control scheme is proposed for the VSC-HVDC transmission system connecting two AC grids. A conventional PI controller is used in the outer loop and a current deadbeat controller is presented in the inner loop in order to achieve fast dynamic response, high tracking accuracy and robustness. Cases of two-terminal VSC-HVDC system are developed in MATLAB/SimPowerSystems to...
In this paper, a Fuzzy Logic Controlled (FLC) buck-boost DC-DC converter for solar energy-battery systems is presented. General design of a fuzzy logic controller (FLC), based on Matlab/Simulink is performed. This design compared with Proportional Integrated (PI) controller. The complete control system has been developed, analyzed, and validated by simulation study. Performances have then been evaluated...
This paper proposes new optimization algorithms for the optimal tuning of PI controllers dedicated to a class of second-order processes with integral component and variable parameters. The sensitivity analysis with respect to the parametric variations of the controlled process leads to the sensitivity models. The augmentation of the output sensitivity functions over the integral of absolute error...
Unlike other explicit congestion controllers that depend on the estimation of network parameters (such as link latency, bottleneck bandwidth, packet loss, or the number of flows) to compute the allowed source sending rate, the IntelRate controller can avoid this while maintaining good stability and robustness. Simulation results have verified these performances. In this paper, we theoretically investigate...
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