scholarly journals Analysis of DC converters for wind generators

2009 ◽  
Vol 22 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Vladimir Lazarov ◽  
Daniel Roye ◽  
Zahari Zarkov ◽  
Dimitar Spirov
Keyword(s):  
Boost Converter ◽  
Variable Speed ◽  
System Behavior ◽  
Power Losses ◽  
Wind Generator ◽  
Wind Generators ◽  
Dc Bus ◽  
Bus Voltage

The present paper investigates the system behavior of a rectifier and a DC boost converter used in a wind generator with variable speed. In many cases a combination of diode rectifier and a DC boost converter is used as interface between the generator and the inverter in order to match the requirements for the DC bus voltage. Different models of the converters have been developed in Malab/Simulink and PSPICE environments. Comparison between the simulations and experiments is shown. The power losses are also discussed. .

scholarly journals Dual-Mode Photovoltaic Bidirectional Inverter Operation for Seamless Power Transfer to DC and AC Loads with the Grid Interface

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
M. Srikanth ◽  
B. Pakkiraiah ◽  
Poonam Upadhyay ◽  
S. Tara Kalyani
Keyword(s):  
Distribution System ◽  
Output Voltage ◽  
Power Flow ◽  
Boost Converter ◽  
Power Transfer ◽  
Dual Mode ◽  
Point Tracking ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

This paper develops the photovoltaic bidirectional inverter (BI) operated in dual mode for the seamless power transfer to DC and AC loads. Normal photovoltaic (PV) output voltage is fed to boost converter, but in space application, boost converter is not so preferable. To overcome this, buck and boost converters are proposed in this paper. Duty cycle to this converter is provided with the help of the outcome of the maximum power point tracking (MPPT) controller. This can be implemented by using perturbation and observation method. The MPPT will operate the switch between buck and boost modes. When the output voltage of a PV array is close to the dc bus voltage, then the bidirectional inverter can fulfill both rectification and grid connected mode. To control the power flow between dc bus and ac grid, a dc distribution system is used to regulate the dc bus voltage to a convinced level. Moreover, the bidirectional inverter must fulfill grid connection (sell power) and rectification (buy power) with power factor correction (PFC) to control the power flow between dc bus and ac grid. The simulations and hardware experimental results of a 2.5 kVA circuit are presented to validate the performance of the proposed dual-mode seamless power transfer.

scholarly journals A comprehensive review of distributed power system architecture for telecom and datacenter applications

2021 ◽  
Vol 12 (3) ◽  
pp. 1535
Author(s):  
Ramesh B. Darla ◽  
Chitra A
Keyword(s):  
Power Distribution ◽  
Power Conversion ◽  
Power Losses ◽  
Voltage Level ◽  
Information And Communication ◽  
Converter Topologies ◽  
Dc Bus ◽  
Bus Voltage ◽  
And Control ◽  
Bus Architecture

With the dominating utility of the internet, it becomes critical to manage the efficiency and reliability of telecom and datacenter, as the power consumption of the involved equipment also increases. Much power being wasted through the power conversion stages by converting AC voltage to DC voltage and then stepping down to lower voltages to connect to information and communication technology (ICT) equipment. 48/12 VDC is the standard DC bus architecture to serve the end utility equipment. This voltage level is further processed to multiple lower voltages to power up the internal auxiliary circuits. Power losses are involved when it is converted from higher voltage to lower voltages. Therefore, the efficiency of power conversion is lower. There is a need to increase the efficiency by minimizing the power losses which occur due to the conversion stages. Different methods are available to increase the efficiency of a system by optimizing the converter topologies, semiconductor materials and control methods. There is another possibility of increasing the efficiency by changing the architecture of a system by increasing the DC bus voltage to higher voltages to optimize the losses. This paper presents a review of available high voltage options for telecom power distribution and developments, implementations and challenges across the world.

scholarly journals An Optimal Control Strategy for DC Bus Voltage Regulation in Photovoltaic System with Battery Energy Storage

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Muhamad Zalani Daud ◽  
Azah Mohamed ◽  
M. A. Hannan
Keyword(s):  
Energy Storage ◽  
Optimization Technique ◽  
Current Mode ◽  
Voltage Regulation ◽  
Boost Converter ◽  
Pv System ◽  
Battery Energy Storage ◽  
Dc Bus ◽  
Bus Voltage ◽  
Battery Energy

This paper presents an evaluation of an optimal DC bus voltage regulation strategy for grid-connected photovoltaic (PV) system with battery energy storage (BES). The BES is connected to the PV system DC bus using a DC/DC buck-boost converter. The converter facilitates the BES power charge/discharge to compensate for the DC bus voltage deviation during severe disturbance conditions. In this way, the regulation of DC bus voltage of the PV/BES system can be enhanced as compared to the conventional regulation that is solely based on the voltage-sourced converter (VSC). For the grid side VSC (G-VSC), two control methods, namely, the voltage-mode and current-mode controls, are applied. For control parameter optimization, the simplex optimization technique is applied for the G-VSC voltage- and current-mode controls, including the BES DC/DC buck-boost converter controllers. A new set of optimized parameters are obtained for each of the power converters for comparison purposes. The PSCAD/EMTDC-based simulation case studies are presented to evaluate the performance of the proposed optimized control scheme in comparison to the conventional methods.

scholarly journals Variable Speed Drive DC-Bus Voltage Dip Proofing

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8257
Author(s):  
Freeman Chiranga ◽  
Lesedi Masisi
Keyword(s):  
Experimental Investigations ◽  
Switched Capacitor ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Voltage Dip ◽  
Voltage Compensation ◽  
Inrush Currents ◽  
Torque Pulsations ◽  
Dc Bus ◽  
Bus Voltage

This paper proposes a power electronic module that uses a switched capacitor for retaining the integrity of the dc-link voltage of a variable speed drive (VSD) during a 0.2 s short-term power interruption (STPI). Ride-through was achieved through switched capacitor onto the dc bus. However, this technique presents a challenge of the high inrush currents during a ride through compensation. In this work both analytical and experimental investigations were conducted in order to reduce the in-rush currents and its impact on the performance of the VSD during the STPI. Inrush peak currents were reduced by approximately 90%. Experimental results showed torque pulsations of 12.8% and 14.3% at the start and end of dc-link voltage compensation, respectively. A method for sizing the switched capacitor and the inrush limiting resistors is proposed. This methodology is based on the use of readily available nameplate information of the VSD and the electric motor. The proposed module can be retrofitted to existing VSDs that are based on v/f control.

scholarly journals Non-linear controller for storage systems with regulated outputvoltage and safecurrent slew-rate for the battery

2020 ◽  
Vol 19 (3) ◽  
pp. 117-129
Author(s):  
Carlos Andrés Ramos-Paja ◽  
Juan David Bastidas-Rodríguez ◽  
Daniel González-Montoya
Keyword(s):  
Storage System ◽  
Design Procedure ◽  
Energy Storage System ◽  
Boost Converter ◽  
Slew Rate ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Non Linear ◽  
Dc Bus ◽  
Bus Voltage

This paper proposes a non-linear control structure for a hybrid energy storage system with a series architecture, which regulates the voltage of a DC bus (output voltage) and ensures that the battery current fulfills the current slew-rate restriction. The proposed solution has two stages, in the first one, the battery is connected to a buck/boost converter that feeds an auxiliary capacitor. In the second stage, the auxiliary capacitor is connected to a DC bus through a second buck/boost converter. Both converters are regulated using cascaded control systems, where the inner loops are slidingmode controllers of the inductors’ current, and the outer loops in the first and second converter are designed to limit the slew-rate of the battery current and to regulate the dc bus voltage, respectively. The paper provides the design procedure for the controllers and validates its performance with simulation results for the power system operating in charging, discharging and stand-by modes.

MPPT of Wind Generation for DC Microgrid

2013 ◽  
Vol 448-453 ◽  
pp. 1802-1805 ◽  
Author(s):  
Yuan Sheng Xiong ◽  
Su Xiang Qian ◽  
Qing Song Liu ◽  
Yan Zhan
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Maximum Output Power ◽  
Boost Converter ◽  
Wind Generation ◽  
Maximum Output ◽  
Output Current ◽  
Dc Microgrid ◽  
Dc Bus ◽  
Bus Voltage

In order to maintain the maximum output power of the WGS (Wind generation system) for all wind speed conditions, a boost converter is used as the power interface between the WGS and DC microgrid. Traditional method is to directly measure the real-time output voltage and current of WGS by sensors. Considering the DC bus voltage is actually stable, the output voltage can be computed by the duty cycle of boost converter and the stable DC bus voltage. A MPPT method is proposed, which only measures the output current of WGS. The output scale power can be obtained by the output current and the duty cycle, and then the perturbation and observation method is executed. A number of voltage sensors and associated circuitry are cancelled. It reduces the interference and system cost and improves the system reliability. Simulation results with PSIM prove the validity of the proposed method.

A Novel Three-Phase Diode Boost Rectifier Using Hybrid Half-DC-Bus-Voltage Rated Boost Converter

2011 ◽  
Vol 58 (4) ◽  
pp. 1316-1329 ◽  
Author(s):  
Petar J. Grbovic ◽  
Philippe Delarue ◽  
Philippe Le Moigne
Keyword(s):  
Boost Converter ◽  
Three Phase ◽  
Dc Bus ◽  
Boost Rectifier ◽  
Bus Voltage
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