scholarly journals Attenuation of DC-Link Pulsation of a Four-Wire Inverter during Phase Unbalanced Current Operation

2021 ◽  
Vol 11 (3) ◽  
pp. 1322
Author(s):  
Dariusz Zieliński ◽  
Karol Fatyga
Keyword(s):  
Energy Storage ◽  
Control Algorithm ◽  
Reactive Power ◽  
Lithium Ion ◽  
Power Converter ◽  
Dual Active Bridge ◽  
Three Phase ◽  
Ion Storage ◽  
Energy Store ◽  
Phase Converter

This paper proposes a control algorithm for a hybrid power electronic AC/DC converter for prosumer applications operating under deep phase current asymmetry. The proposed system allows independent control of active and reactive power for each phase of the power converter without current pulsation on the DC link connected to an energy store. The system and its algorithm are based on a three-phase converter in four-wire topology (AC/DC 3p-4w) with two dual-active bridge (DC/DC) converters, interfaced with a supercapacitor and an energy storage. The control algorithm tests were carried out in a Hardware in the Loop environment. Obtained results indicate that operation with deep unbalances and powers of opposite signs in individual phases leads to current oscillations in the DC link. This phenomenon significantly limits energy storage utilization due to safety and durability reasons. The proposed algorithm significantly reduces the level of pulsation in the DC link which increases safety and reduces strain on lithium-ion storage technology, enabling their application in four-wire converter applications.

scholarly journals Design of a 100-kW Three-phase Interleaved DC/DC Power Converter for Hybrid Supercapacitor-battery Energy Storage

2019 ◽  
Vol 8 (6) ◽  
pp. 2927-2932
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Lithium Ion ◽  
Energy Storage System ◽  
Power Converter ◽  
Minimum Length ◽  
Power Module ◽  
Dc Power ◽  
Three Phase ◽  
Battery Energy

The paper describes the design of a 100-kW three-phase interleaved DC/DC power converter for a hybrid energy storage system based on lithium-ion batteries and supercapacitors. A description of the design and technical solutions of the converter is presented. The design has a minimum length of the connections between elements for lower bulk inductances. The converter uses the SEMIKRON SKiiP IGBT power module with liquid cooling. The control circuit of the converter is shown. The converter operates in buck and boost modes. The results of the simulation of device operation modes are given. The three-phase control scheme allows reducing input current ripple and obtaining the required power.

scholarly journals Control of a Four-wire Hybrid Prosumer Converter for Balancing Utility Grids

2021 ◽  
Vol 6 (1) ◽  
pp. 1-11
Author(s):  
Kwaśny Łukasz ◽  
Dariusz Zieliński
Keyword(s):  
Energy Storage ◽  
Reactive Power ◽  
Storage Device ◽  
Programming Environment ◽  
Power Electronic ◽  
Active And Reactive Power ◽  
Model And Simulation ◽  
Three Phase ◽  
Dc Line ◽  
Phase Converter

Abstract The paper presents the project of the power electronic AC/DC converter operating under a multiresonant control algorithm for prosumer applications. This design allows independent control of active and reactive power for any or each phase. Both the converter and its algorithm are based on a three-phase converter of four-wire topology (AC/DC 3p-4w) with a DC bus, which couple the converter to a renewable energy source and energy storage. Further, model and simulation tests were carried out in the Matlab-SIMULINK programming environment. The results obtained indicate that operation with deep unbalances and powers of opposite signs in individual phases results in current variations (oscillations) in the DC line, which is a significant limitation, and it can be concluded that the level of asymmetry should be limited to the level acceptable to the energy storage device.

Three-Phase Grid Connected Bi-Directional Charging System to Control Active and Reactive Power with Harmonic Compensation

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
Maheswar Prasad Behera ◽  
Pravat Kumar Ray
Keyword(s):  
Energy Storage ◽  
Reactive Power ◽  
Storage System ◽  
Energy Storage System ◽  
Control Technique ◽  
Battery Energy Storage System ◽  
Harmonic Compensation ◽  
Battery Energy Storage ◽  
Three Phase ◽  
Battery Energy

Abstract The feasibility of integration of Battery Energy Storage System (BESS) with a three-phase AC grid is being investigated in this paper. A converter is an inevitable part of a modern DC generating system. The link between the grid and the BESS is established through a Voltage Source Converter (VSC). Therefore, the converter can be utilized to dispatch the DC generated power to the connected AC grid and at the same time provides reactive power compensation and load harmonic compensation throughout the day. The DC bus voltage control of the converter system is carried out to keep the power factor always at unity, irrespective of the charging state of the battery source. The charging and discharging of the connected battery energy storage system are carried out through a bidirectional DC-DC converter. Adaptive hysteresis band current control (AHCC) scheme is employed to produce the switching signals. Finally, its performance is compared with the traditional hysteresis band control technique.

scholarly journals By The Numbers: Grid Energy Storage gets Cheaper

2018 ◽  
Vol 140 (04) ◽  
pp. 28-29
Author(s):  
Jeffrey Winters
Keyword(s):  
New York ◽  
Energy Storage ◽  
Lithium Ion ◽  
Solar Systems ◽  
Ion Storage ◽  
Investment Firm ◽  
Storage Technologies ◽  
The Cost ◽  
Grid Storage ◽  
Modern Technologies

This article discusses introduction of modern technologies to enhance electric grid storage. The New York investment firm Lazard released an analysis of energy storage technologies, based on the levelized cost. The analysis looked at two different common battery chemistries—lithium-ion and lead-acid—as well as flow batteries. Lazard analyzed the cost of ‘behind the meter’ applications, such as battery backups for residential solar systems or businesses trying to save demand at peak times. Lazard expects lithium-ion storage prices to continue dropping over the next 5 years. It is expected that the cost of storage may soon become cheap enough to make the spotty service of wind and solar power an annoyance, not a deal-breaker.

scholarly journals A 100kW Three-Phase Power Inverter for Hybrid Energy Storage System Based on Batteries and Supercapacitors

2019 ◽  
Vol 8 (6) ◽  
pp. 4571-4574
Keyword(s):  
Energy Storage ◽  
Modular Design ◽  
Reactive Power ◽  
Storage System ◽  
Energy Storage System ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Hybrid Energy Storage System ◽  
Three Phase ◽  
Simulation Results

The paper represents the design of a 100 kW three-phase network inverter for a hybrid energy storage system based on batteries and supercapacitors. The presented design is based on fast IGBT switches, provides their effective cooling and can be performed in a modular design. The inverter is designed for parallel operation with the network in bidirectional mode and island mode. The control algorithm allows for direct control of active and reactive power. The obtained simulation model and simulation results are used to calculate the inverter parameters and debug the control system. Simulation results show good performance and effectiveness of the invertor and the algorithm

A New Control Algorithm for Three-Phase, Four-Wire Unified Power Quality Conditioner (UPQC) in Distributing Systems

2012 ◽  
Vol 433-440 ◽  
pp. 6731-6736
Author(s):  
Chandrakant L. Bhattar ◽  
Vilas N. Ghate
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Control Algorithm ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Voltage Source ◽  
Voltage Source Inverter ◽  
Unified Power Quality Conditioner ◽  
Three Phase ◽  
Power Quality Conditioner

This paper presents the new control algorithm for three-phase, four-wire distributing system using unified power quality conditioner (UPQC). The UPQC, a combination of series and shunt active filter (AF) with common dc link, is one of the best solution towards the compensation of voltage sag, swell problems and also compensate voltage flicker/imbalance, reactive power, negative sequence current and maintain zero voltage regulation (ZVR) at the point of common coupling (PCC) on distribution system. The series AF is seen by using a three-phase, three leg voltage source inverter (VSI) and the shunt AF is of a three-phase, four leg voltage source inverter (VSI). The proposed model of the UPQC is developed in the MATLAB/SIMULINK environment and the simulation results prove the power quality improvement in the system.

scholarly journals Multi-Modular Converters with Automatic Interleaving for Synchronous Generator Based Wind Energy System

2021 ◽  
Author(s):  
Maira Zulqarnain
Keyword(s):  
Wind Energy ◽  
Control Algorithm ◽  
Modular Design ◽  
Synchronous Generator ◽  
Energy System ◽  
Power Converter ◽  
Communication Overhead ◽  
Three Phase ◽  
Wind Energy System ◽  
Modular Converter

Among different options available for wind energy system, this research is focused on direct driven Synchronous generator based variable speed wind turbines that are connected to power grid via modular converter units. Compared to single full size power converter, modular design has higher reliability/redundancy, better harmonic performance, lower developmental cost and higher efficiency. Better harmonic performance of modular structure is possible through interleaving which effectively reduces ripple in the output current, enabling use of smaller sized filter components. Focus of this research is to design a controller that can perform automatic interleaving of modular three-phase converters used in above cited wind energy system. Developed control algorithm will have critical decisions carried out by local controllers. With minimum communication overhead the controller will ensure interleaved operation of parallel modules under all conditions. Developed control algorithm is verified through simulation and laboratory testing. Results prove effectiveness of the designed controller.

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