scholarly journals Analysis and Output Power Control of Unidirectional Secondary-Resonant Single-Active-Half-Bridge DC-DC Converter

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7432
Author(s):  
Cao Anh Tuan ◽  
Takaharu Takeshita
Keyword(s):  
Power Control ◽  
Output Power ◽  
High Frequency ◽  
Power Transmission ◽  
Control Method ◽  
Frequency Control ◽  
Input Power ◽  
Total Input ◽  
Bridge Circuits ◽  
Resonant Capacitor

Development of high-frequency-isolated DC-DC converters is underway for charging and discharging electric vehicle batteries. As a charger, a Single Active Bridge (SAB) converter, which is composed of a primary full-bridge converter, a high-frequency transformer, and a secondary full-bridge diode rectifier circuit, has been proposed as a unidirectional high frequency isolated DC-DC converter. In this paper, as a simple circuit configuration, a Secondary-Resonant Single-Active-Half-Bridge (SR-SAHB) converter, in which the primary and secondary circuits of the SAB converter are both half-bridge circuits, and a resonant capacitor connected in parallel to each secondary diode, is created. Due to the partial resonance on the secondary side, power transmission with unity transformer turn ratio and unity voltage conversion ratio can be realized, and a high total input power factor of the transformer can be achieved. As a result, the maximum voltage and current of the switching devices and the transformer voltage can be reduced. Moreover, soft switching in all commutations can be realized. The operation waveform is analyzed, and output power control is derived using the variable frequency control method. The effectiveness of the proposed SR-SAHB has been verified by experimental results using a 2.4 kW 20 kHz, 265V laboratory prototype.

scholarly journals Control of Dual-Output DC/DC Converters Using Duty Cycle and Frequency

2020 ◽  
Vol 11 (4) ◽  
pp. 72
Author(s):  
Yoshinori Matsushita ◽  
Toshihiko Noguchi ◽  
Kazuki Shimizu ◽  
Noritaka Taguchi ◽  
Makoto Ishii
Keyword(s):  
Power Systems ◽  
Duty Cycle ◽  
Control Method ◽  
Frequency Control ◽  
Maximum Efficiency ◽  
Control Factors ◽  
Series Resonant ◽  
Bridge Rectifier ◽  
Bridge Circuits ◽  
Resonant Filters

As part of the integration process of the auxiliary power systems of electric vehicles, plug-in hybrid vehicles and fuel cell vehicles, this study proposes a method to control two different voltage types using two control factors of the rectangular alternating waveforms contained in DC/DC converters, namely the duty cycle and frequency. A prototype circuit consisting of an H-bridge inverter, a transformer, two series resonant filters and two diode bridge circuits was constructed. The H-bridge inverter was connected to the primary side of the transformer and the diode bridge rectifier circuit was connected to the secondary side in parallel. Series resonant filters were inserted between one of the diode bridge circuits and the transformer. Thereafter, the proposed control method was applied to the transformer voltage of the prototype circuit. Although the circuit operation became complex owing to the circulating current flowing between the ground (GND) of the two output circuits, it exhibited ideal static and dynamic characteristics, thereby confirming the possibility of controlling two voltages with the duty cycle and frequency control factors. The results of the efficiency evaluation and loss analysis demonstrated a minimum efficiency of 68.3% and a maximum efficiency of 88.9%. As the output power of the circuit containing the resonant filters increased, the current peak value increased and the circuit became less efficient.

The Realization of Induction Cooker Power Control Based on Fuzzy Control Theory

2013 ◽  
Vol 732-733 ◽  
pp. 965-971
Author(s):  
Min Min Shi ◽  
Hong Bing Chen ◽  
Xue Hong He
Keyword(s):  
Fuzzy Control ◽  
Control Theory ◽  
Power Control ◽  
Output Power ◽  
Control Method ◽  
Working Principle

This paper introduces the working principle of induction cooker and analyzes the design of power control using MCU; the fuzzy control method put forward when the pans change can keep the output power stable.

scholarly journals Design of Output Power Control System Based on Mass Flow Rate Comparison of Air-Fuel Ratio (AFR) on Dual Fuel Generator Set by Using PID Control Method

2020 ◽  
Vol 11 (3) ◽  
pp. 574
Author(s):  
Arief Abdurrakhman ◽  
Totok Soehartanto ◽  
Herry Sufyan Hadi ◽  
Mohammad Berel Toriki ◽  
Bambang Lelono Widjiantoro ◽  
...  
Keyword(s):  
Control System ◽  
Power Control ◽  
Mass Flow Rate ◽  
Output Power ◽  
Mass Flow ◽  
Flow Rate ◽  
Pid Control ◽  
Control Method ◽  
Dual Fuel ◽  
Rate Comparison

scholarly journals The Active Frequency Control Strategy of the Wind Power Based on Model Predictive Control

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Ya-ling Chen ◽  
Yin-peng Liu ◽  
Xiao-fei Sun
Keyword(s):  
Model Predictive Control ◽  
Power Control ◽  
Wind Turbine ◽  
Output Power ◽  
Predictive Control ◽  
Wind Turbines ◽  
Control Strategy ◽  
Frequency Control ◽  
Frequency Deviation ◽  
Load Shedding

In this paper, an active frequency control strategy of wind turbines based on model predictive control is proposed by using the power margin of wind turbines operating in load shedding mode. The frequency response model of the microgrid system with the load shedding of the wind turbines is used to predict the output power and system frequency deviation of the wind turbine. According to the prediction information, the output power control signal of the model predictive controller in the wind turbine can be optimized. On this basis, a wind turbine active participation frequency control strategy based on model predictive control is designed by rolling prediction and optimization. The wind turbine power control signal after the strategy is used to adjust the output power of the wind turbine and balance the change of the active power of the system to reduce the frequency deviation.

scholarly journals An Efficient Power Control Technique for High-Frequency Resonant Inverter in Induction Heating System

2018 ◽  
Vol 8 (6) ◽  
pp. 3530-3535
Author(s):  
A. Kumar ◽  
D. Sarkar ◽  
P. K. Sadhu
Keyword(s):  
Power Control ◽  
Output Power ◽  
Induction Heating ◽  
High Frequency ◽  
Average Power ◽  
Control Technique ◽  
Average Output ◽  
Resonant Inverter ◽  
Wide Range ◽  
Bus Voltage

An efficacious and reliable power control technique has been developed which can be used to regulate the output power of a high-frequency full bridge series resonant inverter (HF-FBSRI) in an induction heating (IH) system. In this paper, a modified buck-boost converter is presented to control the DC link/bus voltage which maintains the IH system under resonant mode and optimizes the performance of the IH system. Controlled DC link/bus voltage has been applied to this HF- FBSRI to control the average output power in the IH system. Using this aimed control technique, a wide range of output powers has been controlled and consistent performance of the IH system has been achieved. ZVS switching technique has been used to reduce the switching losses. Varying average power has been obtained at different duty cycles ranging from 0.2 to 0.8 with variable DC link voltage and it has been corroborated using PSIM environment for an IH system rated at 5500W.

scholarly journals Retaining of Frequency in Micro-grid with Wind Turbine and Diesel Generator

2018 ◽  
Vol 8 (6) ◽  
pp. 3646-3651
Author(s):  
P. D. Chung
Keyword(s):  
Power Control ◽  
Wind Turbine ◽  
Control Method ◽  
Frequency Control ◽  
Speed Control ◽  
Frequency Regulation ◽  
Rotor Speed ◽  
Diesel Generator ◽  
Control Scheme ◽  
Micro Grid

This paper aims to compare the performance of frequency regulation with two control modes of controller including power control scheme and rotor speed control scheme. The frequency control in this research is based on the frequency droop control method but fuzzy logic is used to define the frequency droop coefficient. To compare the performance of these control modes, a simulation of a micro-grid with the existence of a group of doubly fed induction generator wind turbine system and a diesel generator is fulfilled in Matlab/Simulink. Simulation results indicated that the frequency in the micro-grid with two control schemes always remains in the operation range. With the power control scheme, the frequency in the micro-grid is smoother than that with the rotor speed control. Additionally, DFIG wind turbine with the power control scheme has a better performance in terms of electrical energy when compared to the rotor speed control scheme, and hence the cost of fuel used by diesel is less costly.

scholarly journals Synthetical Optimal Design for Passive-Damped LCL Filters in Islanded AC Microgrid

2021 ◽  
Vol 03 (03) ◽  
pp. 1-1
Author(s):  
Xiuhui Tang ◽  
◽  
Daming Zhang ◽  
Hua Chai ◽  
◽  
...  
Keyword(s):  
Power Control ◽  
High Frequency ◽  
Power Flow ◽  
Control Method ◽  
Control Input ◽  
Control Effect ◽  
Efficient Manner ◽  
Robust Solution ◽  
Significant Control ◽  
Ac Microgrid

In AC microgrid systems, technical issues resulting from the power control effect are the power control method efficiency and the filter resonance since voltage-frequency interference and filtering resonance may cause significant control input reduction and oscillation. A simple and robust solution is to regulate active power flow by adding an optimal passive damping resistor. The optimal LCL filter parameterization process in this paper provides an innovative approach to obtain the optimal quality factor and the optimal damping resistor. The amplitude responses of resonant frequency and high frequency are involved in the cost function. Simulations of various cases are conducted in MATLAB/Simulink. The key advantages of this procedure include flattened admittance peak, weakened high frequency decay, and less damping loss. Through the method in this paper, the optimal passive-damped filter parameters can be calculated in an efficient manner, while the power can be regulated and tracked in a simplified way, and the performance of the control strategy is improved.

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