Current Unbalance and DC Bus Unbalance Control for Three Level Grid Tied NPC Inverter Fed by DER with DC-DC Boost Converter

2020 ◽  
Author(s):  
Vishal Sapara ◽  
Raja Saha ◽  
Santosh Phulare
Keyword(s):  
Boost Converter ◽  
Dc Bus ◽  
Current Unbalance

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 Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems

2020 ◽  
Author(s):  
Enes AYAZ
Keyword(s):  
Resonant Frequency ◽  
Wind Turbines ◽  
Thermal Stresses ◽  
Fault Tolerant ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Slip Rings ◽  
Dc Bus ◽  
Current Unbalance ◽  
Inductive Power

The aim of this paper is to design a modular, fault tolerant multi transmitter(Tx) -multi receiver(Rx) parallel connected common DC bus inductive power transfer(IPT) system to replace slip rings in wind turbines or brushless exciters. In parallel connected common DC bus systems, current unbalance is a major issue which results in thermal stresses and over current or voltages. In this paper, two different new current balancing methods are proposed: Cross-coupled Rx modules and intentional miss-tuning of Rx side resonant frequency. These methods are investigated both analytically and experimentally for a single Tx and two Rx system for a 500 W prototype. The proposed methods are tested independently, and then the combined current balancing method is also investigated. For the same missalignment case cross-coupled/de-tuned has a 55.8% current balancing improvement compared to de-coupled/fullytuned topology.

scholarly journals Design a Single Stage AC to DC Converter for LED Driver With Power Factor Improvement

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3312-3318
Keyword(s):  
Power Factor ◽  
Low Voltage ◽  
Input Power ◽  
Boost Converter ◽  
Led Driver ◽  
Peak Voltage ◽  
Flyback Converter ◽  
Snubber Circuit ◽  
Driver Circuit ◽  
Dc Bus

This paper shows the design of a single switch LED driver circuit which is based on the operation of boost converter and flyback converter with power factor correction. In the proposed driver circuit, the boost converter is made to operate in DCM mode for achieving a high power factor and the flyback converter is used for isolating the input-output in order to provide safety. In addition to this, a snubber circuit is also designed for clamping the peak voltage of the main switch into low voltage and also to recycle the leakage inductor energy. A capacitor of low-voltage rating is made to function as the DC bus capacitor due to reason that some amount of the input power is conducted directly towards the output side; the amount of power remaining is then stored in the DC bus capacitor. In this way, the proposed LED driver circuit provides a power factor of greater value, i.e., above 0.95 PF and also a high value of power conversion efficiency, i.e., above 90%.

scholarly journals Control of a Photovoltaic-battery grid-connected multi-source system under different operating conditions

2021 ◽  
Vol 297 ◽  
pp. 01016
Author(s):  
Siham Chakiri ◽  
My Tahar Lamchich
Keyword(s):  
Primary Source ◽  
Boost Converter ◽  
Operating Conditions ◽  
Solar Irradiation ◽  
Control Technique ◽  
Source Power ◽  
Pwm Inverter ◽  
Power Extraction ◽  
Pv Array ◽  
Dc Bus

This paper deals with the control of a grid-connected multi-source power system based on a photovoltaic (PV) array and a battery energy storage system (ESS), taking into account the variable and intermittent characteristics of the solar irradiation level and the ambient temperature in Morocco. The PV generator is connected via a dc-dc boost converter to a common dc bus which is connected through a bidirectional dc-dc converter to the battery ESS. The dc bus output is connected to the mains via a PWM dc-ac converter with an LCL filter. The control technique consists of three parts: the PV array is considered as the primary source and the boost converter is controlled locally to generate the maximum power extraction (MPPT), while the bidirectional dc-dc converter of the ESS battery is controlled to ensure the energy balance according to the power flow under different solar irradiation and temperature conditions. The PWM inverter is controlled to regulate the DC bus voltage and maintain the power factor at the unit. The system is implemented in Matlab/Simulink environment. The effectiveness of the control strategy is carried out by simulation results.

scholarly journals Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems

2020 ◽  
Author(s):  
Enes AYAZ
Keyword(s):  
Resonant Frequency ◽  
Wind Turbines ◽  
Thermal Stresses ◽  
Fault Tolerant ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Slip Rings ◽  
Dc Bus ◽  
Current Unbalance ◽  
Inductive Power

The aim of this paper is to design a modular, fault tolerant multi transmitter(Tx) -multi receiver(Rx) parallel connected common DC bus inductive power transfer(IPT) system to replace slip rings in wind turbines or brushless exciters. In parallel connected common DC bus systems, current unbalance is a major issue which results in thermal stresses and over current or voltages. In this paper, two different new current balancing methods are proposed: Cross-coupled Rx modules and intentional miss-tuning of Rx side resonant frequency. These methods are investigated both analytically and experimentally for a single Tx and two Rx system for a 500 W prototype. The proposed methods are tested independently, and then the combined current balancing method is also investigated. For the same missalignment case cross-coupled/de-tuned has a 55.8% current balancing improvement compared to de-coupled/fullytuned topology.

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 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 Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems

2021 ◽  
Author(s):  
Enes AYAZ
Keyword(s):  
Resonant Frequency ◽  
Wind Turbines ◽  
Thermal Stresses ◽  
Fault Tolerant ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Slip Rings ◽  
Dc Bus ◽  
Current Unbalance ◽  
Inductive Power

The aim of this paper is to design a modular, fault tolerant multi transmitter(Tx) -multi receiver(Rx) parallel connected common DC bus inductive power transfer(IPT) system to replace slip rings in wind turbines or brushless exciters. In parallel connected common DC bus systems, current unbalance is a major issue which results in thermal stresses and over current or voltages. In this paper, two different new current balancing methods are proposed: Cross-coupled Rx modules and intentional miss-tuning of Rx side resonant frequency. These methods are investigated both analytically and experimentally for a single Tx and two Rx system for a 500 W prototype. The proposed methods are tested independently, and then the combined current balancing method is also investigated. For the same missalignment case cross-coupled/de-tuned has a 55.8% current balancing improvement compared to de-coupled/fullytuned topology.

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