scholarly journals Modified Droop Method Based on Master Current Control for Parallel-Connected DC-DC Boost Converters

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Muamer M. Shebani ◽  
Tariq Iqbal ◽  
John E. Quaicoe
Keyword(s):  
System Reliability ◽  
Current Control ◽  
Feedback Signal ◽  
Current Feedback ◽  
Load Current ◽  
Boost Converters ◽  
Control Loops ◽  
Simulink Simulation ◽  
Current Sharing ◽  
Load Regulation

Load current sharing between parallel-connected DC-DC boost converters is very important for system reliability. This paper proposes a modified droop method based on master current control for parallel-connected DC-DC boost converters. The modified droop method uses an algorithm for parallel-connected DC-DC boost converters to adaptively adjust the reference voltage for each converter according to the load regulation characteristics of the droop method. Unlike the conventional droop method, the current feedback signal (master current) for one of the parallel-connected converters is used in the inner loop controller for all converters to avoid any differences in the time delay of the control loops for the parallel-connected converters. The algorithm ensures that the load current sharing is identical to the load regulation characteristics of the droop method. The proposed algorithm is tested with a mismatch in the parameters of the parallel converters. The effectiveness of the proposed algorithm is verified using Matlab/Simulink simulation.

scholarly journals Decentralized Control Method of ISOP Converter for Input Voltage Sharing and Output Current Sharing in Current Control Loop

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1114
Author(s):  
Sung-Hun Kim ◽  
Bum-Jun Kim ◽  
Jung-Min Park ◽  
Chung-Yuen Won
Keyword(s):  
Decentralized Control ◽  
Control Method ◽  
Input Voltage ◽  
Current Control ◽  
Control Loop ◽  
Output Current ◽  
Signal Model ◽  
Control Loops ◽  
Current Sharing ◽  
Small Signal Model

Input-Series-Output-Parallel (ISOP) converters, a kind of modular converter, are used in high-input voltage and high-output current applications. In ISOP converters, Input Voltage Sharing (IVS) and Output Current Sharing (OCS) should be implemented for stable operation. In order to solve this problem, this paper proposes a decentralized control method. In the proposed control, output current reference is changed according to the decentralized control characteristic in individual current control loops. In this way, the proposed control method is able to implement IVS and OCS without communication. Also, this method can be easily used in current control loops and has high reliability compared to conventional control methods that require communication. In this paper, the operation principle is described to elucidate the proposed control and a small signal model of an ISOP converter is also implemented. Based on the small signal model, IVS stability analysis is performed using pole-zero maps with varying coefficients and control gains. In addition, the current control loop is designed in a stable region. In order to demonstrate the proposed control method, a prototype ISOP converter is configured using full-bridge converters. The performance of IVS and OCS in an ISOP converter is verified by experimental result.

scholarly journals Control Algorithm for Equal Current Sharing between Parallel-Connected Boost Converters in a DC Microgrid

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Muamer M. Shebani ◽  
M. Tariq Iqbal ◽  
John E. Quaicoe
Keyword(s):  
Control Algorithm ◽  
High Efficiency ◽  
Control Method ◽  
Storage System ◽  
Dc Microgrid ◽  
Load Current ◽  
Total Load ◽  
Boost Converters ◽  
Current Sharing ◽  
Complexity Cost

DC microgrids are gaining more attention compared to AC microgrids due to their high efficiency and uncomplicated interconnection of renewable sources. In standalone DC microgrid, parallel-connected converters connect the storage system to the load. To achieve equal current sharing among parallel converters, several methods have been presented, but they vary in their current sharing performance, complexity, cost, and reliability. In DC microgrid, the conventional droop control method is preferred because it is more competitive in terms of cost, suitability, and reliability compared to the master-slave control method. However, the conventional droop method cannot ensure equal current sharing due to the mismatches in parameters of parallel-connected converters. To address this limitation, a control algorithm that supervises a modified droop method to achieve precise current sharing between parallel modules is proposed in this paper. The control algorithm is based on the percentage of current sharing for each module to the total load current. The output current measurement of each converter is compared to the total load current and is used to modify the nominal voltage for each converter. The effectiveness of the proposed algorithm is verified by MATLAB simulation model and experimental results.

Force Controllers for AMB Systems with Position and Current Feedback

2013 ◽  
Vol 198 ◽  
pp. 495-500 ◽  
Author(s):  
Rafał P. Jastrzębski ◽  
Alexander Smirnov ◽  
Olli Pyrhönen
Keyword(s):  
Position Control ◽  
State Of The Art ◽  
Dynamic Performance ◽  
Current Control ◽  
Control Loop ◽  
Control Solution ◽  
Current Feedback ◽  
Zero Bias ◽  
Control Loops ◽  
Control Schemes

In this paper, the state-of-the-art AMB controller structure, with an outer centralized position control loop with reference currents and inner current control loops, is replaced with an outer control loop with force references and inner flux control loops. The linearization of the force actuators and different control schemes of the centralized outer control for the radial suspension are considered. The operation of the proposed control under a zero bias is verified by simulations. The proposed control solution can achieve a dynamic performance comparable with that of a controller with the classical bias current.

scholarly journals Investigation of Multilevel Inverter for the Next Distributed Generation Using Low-Cost Microcontroller

2019 ◽  
Vol 10 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Shamsul Aizam Zulkifli ◽  
Epha Yusriyanna Riyandra ◽  
Suriana Salimin ◽  
Ahmed Naji Zaidan ◽  
Ronald Jackson
Keyword(s):  
Distributed Generation ◽  
Pulse Width Modulation ◽  
Filter Design ◽  
Low Cost ◽  
Electrical Power ◽  
Current Control ◽  
Multilevel Inverter ◽  
Communication Interface ◽  
Current Feedback ◽  
Load Current

Nowadays, more research projects have described a converter that is widely used at the distributed generation (DG) level in order to increase the amount of electrical power generation. The converter is known as an inverter when only one DG source is used or as a multi-inverter when several DGs are used. Here, the application of a multilevel inverter with a C2000 microcontroller (Texas Instruments (TI) TMS320F28335 microcontroller), which can be implemented with a current feedback loop, is investigated. This microcontroller acts as a communication interface between MATLAB SIMULINK and the multilevel inverter. Meanwhile, the current control model is modeled in MATLAB for designing the control strategy. It is where the multilevel inverter switches are triggered by using pulse-width modulation (PWM) signals generated by the microcontroller output. At the same time, the proportional integral derivative (PID) current control is used in order to allow the load current to follow the reference current. Based on the results, it can be summarized that the multilevel inverter is a very useful device for the next DG sources when it is combined with current control for load current distribution. From this investigation, it can be seen that in the future DGs could be connected to a multilevel inverter structure, where it will reduce the dependency on filter design and have a more sinusoidal output to the load for different DG power ratings.

Predictive Current Control Design Methodology for DC-DC Basic Topologies: Buck, Boost and Buck-Boost Converters

2021 ◽  
Author(s):  
Marcos Yair Bote-Vazquez ◽  
Eduardo Salvador Estevez-Encarnacion ◽  
Jazmin Ramirez-Hernandez ◽  
Leobardo Hernandez-Gonzalez ◽  
Oswaldo Ulises Juarez-Sandoval
Keyword(s):  
Design Methodology ◽  
Control Design ◽  
Current Control ◽  
Boost Converters

scholarly journals Current Regulator Design for Dual Y Shift 30 Degrees Permanent Magnet Synchronous Motor

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 777
Author(s):  
Zhihong Wu ◽  
Weisong Gu ◽  
Yuan Zhu ◽  
Ke Lu ◽  
Li Chen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Current Control ◽  
Parameter Uncertainties ◽  
Control Loops ◽  
Decomposition Space ◽  
Harmonic Currents

This paper gives the current regulator design for a dual Y shift 30 degrees permanent magnet synchronous motor (DT_PMSM) based on the vector space decomposition (VSD). Current regulator design in α-β subspace is insufficient and designing additional controllers in x-y subspace is necessary to eliminate the harmonic currents due to the nonlinear characteristics of the inverter. A sliding mode controller based on an internal model is proposed in α-β subspace, which is robust to the parameter uncertainties and disturbances in current control loops. In order to eliminate the harmonic currents in x-y subspace, a resonant controller is employed based on a new synchronous rotating matrix. Three-phase decomposition space vector pulse width modulation (SVPWM) technique is illustrated for the purpose of synthesizing the voltage vectors in both subspaces simultaneously. The feasibility and efficiency of the suggested current regulator design are validated by a set of experimental results.

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