scholarly journals Simplified cascade multiphase DC-DC buck power converter for low voltage large current applications: part II --- output current controller

2021 ◽  
Vol 12 (4) ◽  
pp. 2273
Author(s):  
Nungky Prameswari ◽  
Anand Bannet Ganesen ◽  
Falah Kharisma Nuraziz ◽  
Jihad Furqani ◽  
Arwindra Rizqiawan ◽  
...  
Keyword(s):  
Direct Current ◽  
Transfer Functions ◽  
Control Method ◽  
Low Voltage ◽  
Power Converter ◽  
Output Current ◽  
Large Current ◽  
Current Controller ◽  
Gain Margin ◽  
Scheme Analysis

<span lang="EN-US">This paper proposes a control method for new simplified cascade multiphase direct current-direct current (DC-DC) buck power converters used for low-voltage large-current applications such as cathodic protection. To control the proposed converter, a proportional-integral (PI) controller is used to regulate the output current of the converter. The control scheme analysis is carried out by linearizing the small-signal model of the proposed converter to form the output current transfer functions. This transfer function will be analyzed by using phase and gain margin approach to obtain the control parameters (Kp, Ki, and Ti). Simulation and experiment results are included to show the validity of the proposed concept.</span>

scholarly journals Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 140 ◽  
Author(s):  
Eva González-Romera ◽  
Enrique Romero-Cadaval ◽  
Carlos Roncero-Clemente ◽  
Mercedes Ruiz-Cortés ◽  
Fermín Barrero-González ◽  
...  
Keyword(s):  
Power Flow ◽  
Control Method ◽  
Low Voltage ◽  
Hierarchical Control ◽  
Power Converter ◽  
Power Sharing ◽  
Primary Control ◽  
Secondary Control ◽  
Control Loops ◽  
Energy Interchange

It is usual in literature that power sharing among grid-forming sources of an isolated microgrid obeys their energy rating, instead of economic agreements between stakeholders, and circulating energy among them is usually avoided. However, these energy interchanges make strong sense and classical power sharing methods must be reformulated in the context of prosumer-based microgrids. This paper proposes a secondary control method for a prosumer-based low-voltage nanogrid that allows for energy interchange between prosumers, where storage systems, together with PV generators, are the controllable grid-forming sources. A power flow technique adapted to islanded microgrids is used for secondary control algorithm and the whole hierarchical control strategy for the prosumer converter is simulated and validated. This hierarchical control consists of three stages: tertiary control plans the energy interchange among prosumers, secondary obtains different voltage and power setpoints for each of the grid-forming sources, and, finally, primary control guarantees stable voltage and frequency values within the nanogrid with droop rules. Inner control loops for the power converter are also defined to track setpoints and assure stable performance. Simulation tests are carried out, which prove the stability of the proposed methods and the accuracy of the setpoint tracking.

scholarly journals Simplified cascade multiphase DC-DC buck power converter for low voltage large current applications: part I --- steady-state analysis

2021 ◽  
Vol 12 (3) ◽  
pp. 1708
Author(s):  
Anand Bannet Ganesen ◽  
Nungky Prameswari ◽  
Falah Kharisma Nuraziz ◽  
Arwindra Rizqiawan ◽  
Pekik Argo Dahono
Keyword(s):  
Steady State ◽  
Power Converters ◽  
Low Voltage ◽  
Power Converter ◽  
Steady State Analysis ◽  
Voltage Ratio ◽  
Large Current ◽  
Duty Cycles ◽  
Cascade Connection ◽  
Basic Performance

This paper presents a new simplified cascade multiphase DC-DC buck power converter suitable for low voltage and large current applications. Cascade connection enables very low voltage ratio without using very small duty cycles nor transformers. Large current with very low ripple content is achieved by using the multiphase technique. The proposed converter needs smaller number of components compared to conventional cascade multiphase DC-DC buck power converters. This paper also presents useful analysis of the proposed DC-DC buck power converter with a method to optimize the phase and cascade number. Simulation and experimental results are included to verify the basic performance of the proposed DC-DC buck power converter.

The Filtering Device under Improved Direct Current Control

2012 ◽  
Vol 588-589 ◽  
pp. 433-437 ◽  
Author(s):  
Ying Zhao ◽  
Jin Shan Ji ◽  
Nai Cheng Du
Keyword(s):  
Direct Current ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Power Grid ◽  
Current Control ◽  
Filter Method ◽  
Elimination Method ◽  
Direct Current Control

This paper mainly describes the mechanism and elimination method of harmonic in low-voltage power grid. Improve direct current control method in the traditional filter method,filtering the harmonic and timely compensating reactive power in the grid. On this condition, it can make the power grid safe and stability. At the same time simulate the improved direct current control method, and the results verify the correctness and rationality of the control method.

scholarly journals A Virtual Inertia-Based Power Feedforward Control Strategy for an Energy Router in a Direct Current Microgrid Application

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 517 ◽  
Author(s):  
Yuyang Li ◽  
Qiuye Sun ◽  
Danlu Wang ◽  
Sen Lin
Keyword(s):  
Direct Current ◽  
Control Strategy ◽  
Control Method ◽  
Low Voltage ◽  
Feedforward Control ◽  
Voltage Fluctuation ◽  
Dc Microgrid ◽  
Power Load ◽  
Virtual Inertia ◽  
Bus Voltage

Due to the uncertainty of the power load and the randomness of distributed generations, low-voltage direct current (LVDC) bus voltage fluctuation will greatly affect the safety of an energy router-enabled direct current (DC) microgrid. In this paper, a power feedforward control strategy based on a dual active bridge (DAB) DC/DC converter in an energy router-based DC Microgrid is proposed. Based on this strategy, the LVDC bus voltage is controlled by virtual inertia control of the DC microgrid, instead of by the DAB converter. Thus, two benefits of the proposed strategy can be achieved: the power feedforward control can be realized, to mitigate the voltage fluctuation range of the LVDC bus; and the modulation algorithm in the DAB converter can be simplified. Experimental results verify the correctness and effectiveness of the proposed control method.

scholarly journals A dual-stage low-power converter driving for piezoelectric actuator applied in micro robot

2019 ◽  
Vol 16 (1) ◽  
pp. 172988141982684 ◽  
Author(s):  
Ye Mu ◽  
Tianli Hu ◽  
He Gong ◽  
Lijun Wang ◽  
Shijun Li
Keyword(s):  
Low Power ◽  
High Voltage ◽  
Piezoelectric Actuator ◽  
Direct Current ◽  
Low Voltage ◽  
Alternating Current ◽  
Power Converter ◽  
Micro Robot ◽  
Dual Stage ◽  
Current Stage

In this article, a dual-stage converter driving for a piezoelectric actuator based on flyback circuit was designed and implemented, which could be applied in a micro robot. A low-voltage direct current could be converted to a high-voltage alternating current through flyback circuit and direct current/alternating current circuit in low-power condition. In the direct current/direct current stage, the charging and discharging process was realized to generate a high voltage bias from a low voltage directly supplied by battery. Then, the high voltage was converted into alternating waveform by an energy recovery circuit in direct current/alternating current stage. Experiments were conducted to verify the ability of the proposed converter to drive a 100-V-input piezoelectric bimorph actuator using a prototype 108 mg (excluding printed circuit board mass), 169 (13 × 13) mm2, and 500-mW converter. According to the experimental results, this converter could be used for driving piezoelectric actuator applied in micro robot.

scholarly journals Modular Multi-Port Ultra-High Power Level Power Converter Integrated with Energy Storage for High Voltage Direct Current (HVDC) Transmission

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2711 ◽  
Author(s):  
Sen Song ◽  
Wei Li ◽  
Kai Ni ◽  
Hui Xu ◽  
Yihua Hu ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Voltage ◽  
Direct Current ◽  
Power Plants ◽  
High Efficiency ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Power Converter ◽  
Hvdc Transmission ◽  
High Voltage Direct Current

To connect renewable energy sources (RESs) with a unity-grid, energy storage (ES) systems are essential to eliminate the weather fluctuation effect, and high voltage direct current (HVDC) transmission is preferred for large-scale RESs power plants due to the merits of low cost and high efficiency. This paper proposes a multi-port bidirectional DC/DC converter consisting of multiple modules that can integrate ES system and HVDC transmission. Thanks to the adoption of three-port converters as submodules (SMs), ES devices, for example, batteries, can be decentralized into SMs and controlled directly by the SMs. Additionally, SMs are connected in a scalable matrix topology, presenting the advantages of flexible power flows, high voltage step-up ratios and low voltage/current ratings of components to satisfy the requirements of HVDC transmission. Furthermore, the control flexibility and fault tolerance capability are increased due to the matrix topology. In this paper, the analysis of the novel modular multi-port converter is introduced, and its functions are verified by the simulation results in PSIM.

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