The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper a detailed description of the design and simulation of a DC ultra-fast recharging station for Electric Vehicles is carried out. The system consist of a single AC/DC grid connected inverter, a DC-Bus and two DC/DC converter to recharge the batteries of the EVs. The system also has the vehicle-to-grid (V2G) capability. The design of the components of the system and the control schemes...
Aiming at that it is difficult to choose the value of virtual damping(VD) in passivity-based controller of the Boost converter, this paper proposes an approach which can be used to calculate and optimize the value of VD. The range of VD can be determined by constraining overshoot of the current response of Boost converter. The optimal VD can be found in the range of VD by genetic algorithm(GA) and...
Reliability of power electronics is a critical issue, as most of the electrical energy is processed by power electronics. Various stressors impact the safe operation of the systems, including harsh environments, temperature variations, humidity, vibration and radiation. Physics of failure analysis uses models that describe how failure mechanisms evolve over time and induce failures. Active methods...
A novel load current sharing method is proposed for multi-module LLC resonant converters in high power application in this paper. The paralleled system is controlled by the maximum current sharing method to achieve load sharing automatically. Moreover, a series inductor is connected to each LLC output side to restrain the current ripple of double switching frequency. The maximum current sharing method...
This paper presents a new control strategy for Modular Multilevel Matrix converters where the output frequency is higher then the input frequency. In operating points when ωout ≥ ωin the energy pulsation in the converter cells are dominated by the second harmonic of the input frequency. These energy pulsations can be identified and compensated by inducing additional currents. The results are verified...
This paper proposes a fixed frequency based sliding mode (SM) controller for transformer-less single phase inverter for photovoltaic (PV) application with active power decoupling minimizing the capacitance requirement. Unlike conventional power decoupling techniques in full bridge converters, the proposed technique incorporates a large sinusoidal swing of the half-bridge capacitor voltages and a limited...
Real-time simulation of modular multilevel converter (MMC)-based HVDC is one of the most important and difficult technologies in the area of power electronics research. This paper presents a methodology for the hardware in loop (HIL) CPU/FPGA-based real-time simulation of a one-terminal MMC HVDC of up to 468 levels using a detailed equivalent model, and the simulation system is based on full-scale...
In this paper reactive power compensation using an infinite level inverter based STATCOM is proposed. Nowadays, the society is becoming increasingly dependent on the electrical supply. New equipment's are more sensitive to power quality variations. This causes the transmission line to transfer equal or sometimes more than its capacity, which leads to overloading, voltage fluctuations etc. in the system...
This paper presents an effective two stage DAB charging-up control method for modular DC-DC converters with low voltage side common DC bus voltage starting from zero. In 1st stage of charging, the DAB controller is modified to allow variable duty cycle control of medium voltage side DAB converter. In this stage, a constant charging-up current is applied so that low voltage side DC link voltage is...
The transient performance of a DC power supply strongly depends on the loop design and output filter sizing. Most of the time, the finite loop bandwidth imposes the need of a large output filter capacitor in order to comply with the required regulation performance and stability margins. In space applications the linear conductance control principle has been used for a long time. It reduces the voltage...
A MIMO1 current-control approach for 3-phase grid connected inverter systems in the abc-frame is proposed. Redundant states are eliminated and the system is controlled via an explicit MPC2-approach. To achieve steady-state accuracy, the system-model is augmented by a simplified grid-model to obtain a high dynamic control structure, which supersedes the use of resonant controllers and coordinate transformations...
Distribution Management systems are effectively used by electric utilities for analyzing and controlling the distribution systems, but inconsistencies in the modelling parameters of the distribution network or cyber-attack conditions may result in failing of the controller to maintain voltage profile in a smart distribution system. In this paper we propose a statistical method based on multiple linear...
The paper presents a new soft switching system in three-phase voltage source inverters. In the majority of existing soft switching systems, there is a risk of damaging main or auxiliary transistors in the case of disturbances in the control system due to capacitors that are connected in parallel to the main transistors and due to resonant inductors which are connected in series to the auxiliary transistors...
Traditional HVDC systems employ line commutated converters (LCCs) which are prone to commutation failures and feature significant harmonic distortion. Voltage source converter (VSC)-based HVDC systems have been employed to overcome these disadvantages, but their high switching frequency makes it difficult to scale to high power levels. Recently, a VSC topology named modular multilevel converter (MMC)...
The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface...
A DC bus voltage ripple suppression method based on super-capacitor (SC) was proposed under unbalanced load. Firstly, the influence of unbalanced load on DC microgrid was analyzed. And then, depending on the mathematical model of the SC compensation device, current control strategy of the SC was designed using the sliding mode control (SMC) to precisely track the pulsating current. Furthermore, parameters...
In this paper, considering the change rate of the load, a frequency division control is optimized to improve the control accuracy of hybrid energy storage, compared to the traditional frequency division control. Firstly, the optimal control strategy is designed based on the first power allocation and the second power allocation. Secondly, the model is applied in residential area to avoid the peak...
This paper presents an all-digital background blind calibration technique for the capacitor mismatch problem in SAR ADCs. It utilizes the redundancy offered using a sub-radix-2 DAC architecture to blindly estimate the mismatch and the assigned weight for each comparator decision. The weights are estimated by building partial histogram windows for the comparator decision vectors. To remove the dependency...
Energy Router has received lots of attention in a great amount of applications due to its powerful functionality and great flexibility. Capacitor charging strategy plays a key role in the operation of energy router. The focus is on the submodule applied in the hybrid multilevel energy router in this paper. The submodule is constituted of a three-level rectifier and an isolated DC-DC converter in which...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.