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In order to solve the poor dynamic characteristics and adjustment effect of traditional voltage filter control system of welding machine. In this paper, the mathematical model of the voltage filter control system of welding machine is established, and the fuzzy control rule is applied to the Voltage Control System, and two improved fuzzy control schemes including fuzzy-PID compound control and fuzzy...
DC power supply mode is used for high power fast charging of electric vehicles, the voltage ripple generated by rectifier of preceding stage causes overvoltage and overcurrent in the battery, which can reduce the battery life, the operation stability of post-stage DC-DC chopper is also reduced, so the quality of charging is affected. Hence it is important to restrict voltage ripple generated by rectifier...
This research presented multilevel inverter using cascade transformers to supply the output voltage levels which are used to control speed of asymmetrical two-phase induction motor. Two sets of full bridge inverters and transformer with difference of number of turn ratio are combined to generate the voltage levels to supply each winding of asymmetrical two-phase induction motor. Triangular multicarrier...
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 presents a 27-Level asymmetric multilevel shunt active power filter topology that allows the compensation of a nonlinear load, as well as the DC voltage regulation thanks to a comprehensive control strategy. The topology considers the ratio 9∶3∶1 in order to generate the AC waveform with a simple staircase modulation algorithm. The dynamic model of the proposed topology is obtained and...
The current control techniques on ARP (Auxiliary Rescue Power) for elevator system are presented in this paper. The purpose of this system is to assure the safety of the passengers by using electric power stored in a battery during power outage. The conventional current controller used in converter and inverter are Proportional-Integral control and dead-beat control which require complex coordinate...
This paper presents a detailed analysis of a single phase high power factor boost half-bridge rectifier (RPFU-HBB). The purpose of this work is to achieve a unity power factor with tight-regulated output voltage. Using the experimental prototype for 120 Vrms input voltage, output power 80W and output voltage of 450V; a power factor of 0.99 and total harmonic distortion of 2.5% was obtained. In order...
This paper deals with a comparative study between Proportional Integral (PI) and Sliding Mode in control of a doubly fed induction generator to feed power to the grid. Modeling of the DFIG in d-q frame reference is presented and the field-oriented strategy is applied. We use PI and sliding mode techniques respectively to control the rotor side converter (RSC) and the grid side converter (GSC). Simulation...
Alternative energy systems (AES) are becoming popular for small scale power generation. Designing the converters which transform the DC power into AC is the main development area of AES. Conventional single-phase voltage source inverter (VSI) uses buck topology which gives lower average output voltage than the input DC voltage. However, where the output voltage requirement is larger than the input...
This paper presents a voltage oriented control (VOC) for a three level, three-phase PWM rectifier using a fuzzy logic control strategy. The PI control was replaced by fuzzy control aimed to reduce the total harmonic distortion (THD) on the grid side, to improve the power factor (PF) as well as keep the output DC voltage to the required level when a dynamic disturbance happens. The MATLAB/Simulink...
This paper presents modelling, simulation and analysis of novel control strategies for variable speed wind turbines driven by a Permanent Magnet Synchronous Generators (PMSG) connected to the grid. The machine side controller is designed to match Maximum Power Point Tracking (MPPT) to obtain high extraction of wind power while connected to a the grid, and the grid side controller fixes the DC voltage...
This paper contracts with the specific type of robust control i.e., sliding mode control for position and speed controlling of a DC servo motor. The paper contributes synthesis and investigation of DC servo motor with sliding mode controller and conventional PI controller. Modeling and simulations are carried out and their enactment is assessed in steady as well as in transient state. Subsequently...
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...
This paper presents a performance comparison of PI and Linear Quadratic Regulator (LQR) controllers for regulating the output voltage of a boost DC-DC converter. Performance of these controllers has been tested under different disturbances in output voltage, input voltage, and load current using MATLAB/Simulink simulation package. The comparison indicates that LQR controller performance is better...
This paper proposes a new feedback linearization control strategy for the grid-connected voltage source converter (VSC). The instantaneous power components at the VSC terminal are being utilized as its dynamic variables. It is due to fact that, as these power components can be directly computed from the three-phase instantaneous voltage and current components measured at the VSC terminal, the need...
The output voltage waveform quality of single-phase energy storage inverter is an important measurement index of its performance. In this paper, the mathematical model of single-phase energy storage inverter is analyzed, and its inverse model is established using BP neural network. Combined with a single loop PI controller, two different control methods are proposed based on the inverse model. One...
In this paper, a simulation study of control methods for three-phase energy storage inverter (TPESI) is presented. In energy invertion situation, the proportional integral (PI) control scheme and passivity-based control (PBC) scheme based on single loop control structure are discussed and compared. In energy storage situation, the control structure is usually taken as double loop form: inner current...
DC/DC converters with hybrid proton exchange membrane (PEM) fuel cell and battery power sources are designed and implemented using sliding mode control (SMC). The converters are typically comprised by unidirectional boost converter and bidirectional converter which are used for regulating the bus voltage and managing power distribution. SMC is selected to control the converters since it can cope with...
Bidirectional DC-DC converter is potentially used for an energy charging or discharging device; however, the converter displays highly non-linear characteristics since its internal system parameter varies depending on the operation mode and the disturbance engagement. To cope with the non-linearity, a bidirectional DC-DC converter based on time delay control (TDC) is designed and validated for lithium-ion...
This paper presents a comparative analysis of control methods to extract the maximum power and to track the maximum power point (MPP) from photovoltaic (PV) systems under changeable environmental conditions. The PV system consists of a solar module and a DC/DC converter, in this case a buck-boost converter, connected to a load. The maximum power point tracking (MPPT) algorithms compared are the perturb...
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