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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...
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...
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...
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...
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...
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...
The boost inverter can be an alternative grid interfacing power converter for renewable energy sources since it can generate an AC voltage whose peak value could be greater than the DC voltage. When it connects to the grid, high quality output current is required, therefore, grid current is hoped to be controlled directly. A novel control strategy to control grid current with only one closed control...
This paper presents a three-phase six-level Asymmetrical Hybrid Multi-Level Photovoltaic Inverter (AHMLPI) for medium voltage grid connected applications. A Low to Medium Voltage Transformer is operated in an open-end winding configuration. Thus the low voltage winding is supplied on one end by a three-phase three-level Neutral Point Clamped Inverter (NPC) and, on the other side, by an auxiliary Two-Level...
Modular multilevel converter (MMC) receives wide acceptance in high power, high voltage applications. However, large capacity capacitors are needed in the sub-modules due to low frequency fluctuation power. The voltage fluctuation is even larger especially in the startup of Motor drive or low frequency output application. Besides, the integrated energy storage systems (ESS) in MMC is used for recovering...
A novel variable frequency variable duty cycle (VFVD) control scheme using off-line digital control by only sensing the output voltage is proposed. Designed for a 6 kV 40 kHz series resonant DC-DC converter in solid state transformer application, it realizes cycle-by-cycle resonant current limiting and zero voltage switching (ZVS) at any load condition. According to the state plane analysis, with...
This paper proposes dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip. It improves system stability and reduces output voltage at the load release. The concept of dynamic ramp control uses sample and hold circuit, comparator, and ramp valley control circuit adjusted according to the varied ramp signal to avoid the generation of an error pulse signal to regulate...
The high voltage constant current charging power supply with high charging efficiency and good stability is developed. The power supply has the advantages of small volume, low cost, etc. Design index is that the charging constant current is 0.34A, the charging voltage is 60kV, the power is 20kW. Simulation analysis of the original system using Pspice simulation software, in the light of the average...
This paper introduces a high performance (90% efficiency) 3kW, 3000/3600rpm, 50/60Hz 1 phase autonomous PM generator with (8+2)kg total weight and simplified control (switched capacitor) control for max ±7% voltage regulation from pure resistive to resistive inductive (0.8 power factor, lagging) loads. Topology, design principles, FEM based characterization are accomplished by modeling for steady...
This paper proposes the high voltage gain quadratic boost converter for supplying standalone ac loads using renewable power supply that generates dc power at low voltages. A fixed frequency SMC has been proposed in this paper to regulate the dc link capacitor voltage. The conventional SMC has variable switching frequency while leads to the damage of passive components as well as unpredictable response...
Solar Photovoltaic system plays an important role in power generation system. The output power produced in the photovoltaic modules relies on upon solar radiation and temperature of the solar cells. In this paper an utilization of sliding mode control technique is connected to track maximum power of photovoltaic cells. This usage depends on grid connected dc to dc switching converter. This is typically...
The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential...
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