scholarly journals DCSST Multi-Modular Equalization Scheme Based on Distributed Control

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8125
Author(s):  
Fei Teng ◽  
Dezheng Kong ◽  
Zixuan Cui ◽  
Yuan Qin ◽  
Zhenghang Hao ◽  
...  
Keyword(s):  
Distributed Control ◽  
Control Strategy ◽  
Input Voltage ◽  
Phase Shifting ◽  
Loop Current ◽  
Loop Control ◽  
Solid State Transformers ◽  
Dual Active Bridge ◽  
Circulation Current ◽  
Balancing Control

As an important part of the DC micro-grid, DC solid-state transformers (DCSST) usually use a dual-loop control that combines the input equalization and output voltage loop. This strategy fails to ensure output equalization when the parameters of each dual active bridge (DAB) converter module are inconsistent, thus reducing the operational efficiency of the DCSST. To solve the above problems, a DCSST-balancing control strategy based on loop current suppression is presented. By fixing the phase-shifting angle within the bridge and adjusting the phase-shifting angle between bridges, the circulation current of each DAB converter module is reduced. Based on the double-loop control of the DAB, five controllers are nested outside each DAB submodule to achieve distributed control of the DCSST. The proposed control strategy can reduce the system circulation current with different circuit parameters of the submodules, ensure the balance of input voltage and output current of each submodule, and increase the robustness of the system. The simulation results verify the validity of the proposed method.

scholarly journals Control for Three-Phase LCL-Filter PWM Rectifier with BESS-Oriented Application

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4093 ◽  
Author(s):  
Mora ◽  
Núñez ◽  
Visairo ◽  
Segundo ◽  
Camargo
Keyword(s):  
Storage System ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Current Control ◽  
Loop Current ◽  
Pwm Rectifier ◽  
Lcl Filter ◽  
Loop Control ◽  
Practical Applications ◽  
Three Phase

This paper deals with a battery energy storage system (BESS) in only one of its multiple operating modes, that is when the BESS is charging the battery bank and with the focus on the control scheme design for the BESS input stage, which is a three-phase LCL-filter PWM rectifier. The rectifier's main requirements comprise output voltage regulation, power factor control, and low input current harmonic distortion, even in the presence of input voltage variations. Typically, these objectives are modeled by using a dq model with its corresponding two-loop controller architecture, including an outer voltage loop and a current internal loop. This paper outlines an alternative approach to tackle the problem by using not only an input–output map linearization controller, with the aim of a single-loop current control, but also by avoiding the dq modeling. In this case, the voltage is indirectly controlled by computing the current references based on the converter power balance. The mathematical model of the three-phase LCL-filter PWM rectifier is defined based on the delta connection of the filter, which accomplishes the requirements of a 100 kW BESS module. Extensive simulation results are included to confirm the performance of the proposed closed-loop control in practical applications.

Control of Grid-Side MMC for Wave Power Generation

2013 ◽  
Vol 860-863 ◽  
pp. 2342-2345
Author(s):  
Hong Wei Fang ◽  
Hui Min Chu
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Wave Power ◽  
Generation System ◽  
Loop Control ◽  
Power Generation System ◽  
Grid Side ◽  
The Mathematical Model ◽  
Balancing Control ◽  
Wave Power Generation

The mathematical model of grid-connected wave power generation system based on modular multilevel converter (MMC) is deduced with topology structure and the operation principle of the MMC analyzed in this paper. Then the corresponding current decoupling control strategy is obtained in dq coordinates. Simultaneously, averaging voltage control and voltage balancing control are used to control the MMC to solve the imbalance and the ripple of the capacitor voltage of sub-modules. Moreover, the double closed-loop control strategy is used to control the grid-side MMC. Finally, the simulation model of grid-connected wave power generation system based on MMC is built in Matlab/Simulink. The simulation is carried out to verify the effectiveness and feasibility of the proposed control strategy.

Control of a Digital Micromirror Device Using Input Shaping

2007 ◽  
Author(s):  
H. Jammoussi ◽  
S. Choura ◽  
E. M. Abdel-Rahman ◽  
H. Arafat ◽  
A. Nayfeh ◽  
...  
Keyword(s):  
Electrostatic Field ◽  
Control Strategy ◽  
Nonlinear Function ◽  
Input Voltage ◽  
Open Loop ◽  
Input Shaping ◽  
Control Law ◽  
Digital Micromirror Device ◽  
Open Loop Control ◽  
Loop Control

In this paper, an open-loop control strategy is proposed for maneuvering the angular motion of a Digital Micromirror Device (DMD). The control law is based on a micromirror model that accounts for both bending and torsion motions. The model characterizes two DMD configurations: with and without contact with the substrate. The device is actuated using an electrostatic field which is a nonlinear function of the states and input voltage. The proposed control strategy is a Zero Vibration (ZV) shaper. It overshoots the DMD to its desired final angle by appropriately varying two independent input voltages. Actuating voltages and switching times are determined to maneuver the DMD from −10° to +10° tilt angles while reducing the residual vibrations.

Control Strategy for Vanadium Redox Battery Inverter in Islanding Microgrid

2012 ◽  
Vol 433-440 ◽  
pp. 5794-5800
Author(s):  
Feng Zhou ◽  
Ke Wang ◽  
Jian Ye Chen ◽  
Hua Zhang
Keyword(s):  
Renewable Energy ◽  
Distributed Generation ◽  
Control Strategy ◽  
Pi Controller ◽  
Current Control ◽  
Loop Current ◽  
Vanadium Redox Battery ◽  
Outer Loop ◽  
Loop Control ◽  
Vanadium Redox

Microgrid is one of the promising solutions to interconnecting the renewable energy in the form of Distributed Generation with the utility grid, where the inverter control strategy for battery is essential. In this paper, a dual-loop control strategy is proposed for Vanadium Redox Battery inverter in islanding mode. The dual-loop control strategy consists of an inner-loop current control and an outer-loop voltage control, both of which adopt the classical PI controller. Further, the strategy applied in transient mode is also discussed. The proposed dual-loop control strategy has been tested in MATLAB/Simulink simulations and experimentally on a laboratory-scale system.

scholarly journals Design and simulation of cascaded H-bridge multilevel inverter with energy storage

2021 ◽  
Vol 23 (3) ◽  
pp. 1289
Author(s):  
Tan Chee Ting ◽  
Zulhani Rasin ◽  
Chan Sia Ching
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Rural Areas ◽  
Power Conversion ◽  
Loop Current ◽  
Battery Storage ◽  
Storage Unit ◽  
Loop Control ◽  
Current Controller ◽  
Bidirectional Converter

<p>Stand-alone power system provides a solution for the user in rural areas that are disconnected from the utility grid which requires power electronics device for the power conversion. This work proposes a design of 5-level cascaded H-bridge inverter with energy storage to realize DC-AC power conversion for such system. The DC-DC bidirectional converter is designed to control the charging and discharging of current into/from the battery during the buck and boost mode of operation. At the DC side, dual-loop control strategy using PI controllers is designed to control the current and voltage. The inner loop current controller controls the recharging/discharging of current for the battery, while the outer voltage controller controls the DC link voltage at 200 V for each of the H-bridge unit. At the AC side, multiple feedback loop control strategy regulates the inverter output voltage at 240 Vrms under various load change. The modelling and design of the system is implemented under Matlab Simulink environment. From the results, the battery storage unit works well with the DC link voltage to achieve a balance power transfer within the system between the PV source, load and battery storage under variation of PV power and loading condition.</p>

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