An improved on-time control method to reduce the line-current distortion for BCM/DCM mixed micro-inverter at light load condition

2012 ◽  
Author(s):  
Zhe Zhang ◽  
Chi Zhang ◽  
Min Chen ◽  
Zhaoming Qian
Keyword(s):  
Control Method ◽  
Load Condition ◽  
Line Current ◽  
Time Control ◽  
Light Load ◽  
Micro Inverter

A Coordinated Voltage Control Scheme for Distribution Network with Renewable Sources

2015 ◽  
Vol 781 ◽  
pp. 393-396
Author(s):  
Worawat Nakawiro
Keyword(s):  
Optimal Power Flow ◽  
Control Method ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Load Condition ◽  
Voltage Control ◽  
Distribution Networks ◽  
Simulation Software ◽  
Mixed Integer ◽  
Light Load

With significant penetration of renewable energy sources in distribution networks, the voltage control method may have to be revised especially during the light load condition. This paper presents a coordinated voltage control strategy to address this issue. A mixed-integer nonlinear optimal power flow was formulated and solved by Particle Swarm Optimization (PSO). All system constraints and operating limits are considered. The code was written using DigSILENT programming language (DPL) and implemented inside DigSILENT power factory simulation software. The proposed method can minimize generation curtailment to prevent overvoltage at any buses. A realistic distribution network was adopted to demonstrate the systems’ effectiveness. Simulation results show that all security constraints are maintained within operating limit. Power losses at the same time are minimized in comparison to the losses using the classical control method.

scholarly journals Power Device Temperature-Balancing Control Method for a Phase-Shift Full-Bridge Converter

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1623
Author(s):  
Jun-Mo Kim ◽  
Jeong Lee ◽  
Kyung Ryu ◽  
Chung-Yuen Won
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Control Method ◽  
Balance Control ◽  
Load Condition ◽  
Power Device ◽  
Maximum Temperature ◽  
Temperature Deviation ◽  
Light Load ◽  
Switching Method

In this paper, a switching method is proposed for power device temperature-balancing in a phase-shift full-bridge (PSFB) converter. PSFB is commonly used for applications that require high efficiency, because a zero-voltage switching (ZVS) operation is possible on the primary-side. In PSFB, the circulation current complicates ZVS under a light-load condition, which generates heat. Meanwhile, the heat generated in PSFB creates a temperature deviation between the lagging leg and the leading leg, which shortens the lifetime of the power device, thereby reducing system reliability and efficiency. To solve this problem, previous studies applied a pulse-width modulation (PWM) switching method for light and medium loads, and a phase-shift switching method for the region where ZVS is possible. Although this method has the advantage of easy control, the maximum temperature of the legs of the PSFB increases with medium loads. In this paper, a temperature-balancing algorithm—a temperature-balance control—is proposed to decrease the leg temperature using switching based on position exchanges of the leading leg and lagging leg along with PWM switching. Temperature-balance control minimizes leg temperature deviation under light load conditions. The proposed control method provides a minimum temperature difference between the two legs and high efficiency.

scholarly journals An Interleaved Phase-Shift Full-Bridge Converter with Dynamic Dead Time Control for Server Power Applications

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 853
Author(s):  
Jia-You Lee ◽  
Jheng-Hung Chen ◽  
Kuo-Yuan Lo
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Dead Time ◽  
Load Condition ◽  
Power Converter ◽  
Switching Loss ◽  
Time Control ◽  
Light Load ◽  
Wide Range ◽  
Voltage Spike

A compact and high-efficiency power converter is the main business of today’s power industry for server power applications. To achieve high efficiency with a low-output ripple, an interleaved phase-shift full-bridge (PSFB) converter is designed, built, and tested for server power applications in this study. In this paper, dynamic dead time control is proposed to reduce the switching loss in the light load condition. The proposed technique reduces the turn-off switching loss and allows a wide range of zero-voltage switching. Moreover, the current ripple of the output inductor can be reduced with the interleaved operation. To verify the theoretical analysis, the proposed PSFB converter is simulated, and a 3 kW prototype is constructed. The experimental results confirm that the conversion efficiency is as high as 97.2% at the rated power of 3 kW and 92.95% at the light load of 300 W. The experimental transient waveforms demonstrated that the voltage spike or drop is less than 2 V in the fast-fluctuating load conditions from 0% load to 60% load and 40% load to 100% load.

Damping control method utilizing overvoltage resistor under light load condition

2017 ◽  
Vol 13 (2) ◽  
pp. 345-346 ◽  
Author(s):  
Febry Pandu Wijaya ◽  
Hiroyasu Kobayashi ◽  
Keiichiro Kondo ◽  
Tetsuya Iwasaki ◽  
Akihiro Tsumura
Keyword(s):  
Control Method ◽  
Load Condition ◽  
Damping Control ◽  
Light Load

Off-Time Control of LLC Resonant Half-Bridge Converter to Prevent Audible Noise Generation Under a Light-Load Condition

2018 ◽  
Vol 33 (10) ◽  
pp. 8808-8817 ◽  
Author(s):  
Ho-Young Yoon ◽  
Hyeon-Seok Lee ◽  
Seok-Hyeong Ham ◽  
Hyung-Jin Choe ◽  
Bongkoo Kang
Keyword(s):  
Load Condition ◽  
Noise Generation ◽  
Time Control ◽  
Light Load ◽  
Off Time

Optimized Non-Dead-Time Control of Inverter with Two-Phase Modulated SVPWM

2012 ◽  
Vol 562-564 ◽  
pp. 1531-1536
Author(s):  
Ming Xing Zhu ◽  
Jing Bo Shi
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Control Method ◽  
Short Circuit ◽  
Two Phase ◽  
Zero Crossing ◽  
Time Control ◽  
Bus Voltage ◽  
Current Zero

In the inverter control system, two-phase modulated space vector pulse width modulation (SVPWM) algorithm has the advantages of minimum switch loss and higher utilization of direct current (DC) bus voltage. Non-dead-time control strategy can eliminate the problems of the dead time effects. But the traditional non-dead-time control strategy heavily depends on the current zero-crossing detection, which may cause the output voltage distortion or even a short circuit. Based on the analysis of the reason for the distortion, a new optimized non-dead-time control method is proposed. Two methods for the detection of the overlapping area are enumerated. The conclusions are confirmed by the simulation results with MATLAB/ SIMULINK.

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