High Efficiency Control Method for Insulated DC-DC Converter under Light Load Condition for Photovoltaic Generation System

2013 ◽  
Vol 133 (2) ◽  
pp. 196-202 ◽  
Author(s):  
Yuta Terae ◽  
Shohei Anze ◽  
Kiyoshi Ohishi ◽  
Hitoshi Haga ◽  
Takayuki Shimizu
Keyword(s):  
High Efficiency ◽  
Control Method ◽  
Load Condition ◽  
Generation System ◽  
Photovoltaic Generation ◽  
Light Load ◽  
Efficiency Control

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.

A Power Smoothing Control Method for a Photovoltaic Generation System using a Water Electrolyzer and its Filtering Characteristics

2018 ◽  
Vol 138 (10) ◽  
pp. 822-828
Author(s):  
Akiko Takahashi ◽  
Akihisa Goto ◽  
Yuuki Machida ◽  
Shigeyuki Funabiki
Keyword(s):  
Control Method ◽  
Generation System ◽  
Photovoltaic Generation ◽  
Power Smoothing

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 A power smoothing control method for a photovoltaic generation system using a water electrolyzer and its filtering characteristics

2019 ◽  
Vol 206 (2) ◽  
pp. 25-32
Author(s):  
Akiko Takahashi ◽  
Akihisa Goto ◽  
Yuuki Machida ◽  
Shigeyuki Funabiki
Keyword(s):  
Control Method ◽  
Generation System ◽  
Photovoltaic Generation ◽  
Power Smoothing

A Dual-Mode High-Voltage High-Efficiency Peak-Current-Mode Asynchronous Buck Converter

2016 ◽  
Vol 25 (11) ◽  
pp. 1650136 ◽  
Author(s):  
Zhaohan Li ◽  
Yongcheng Ji ◽  
Shu Yang ◽  
Yuchun Chang
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Load Condition ◽  
Reducing Power ◽  
Current Mode ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Peak Current ◽  
Light Load

This paper proposes a high-voltage high-efficiency peak-current-mode asynchronous DC–DC step-down converter operating with dual operation modes. The asynchronous buck converter achieves higher efficiency in light load condition compared to synchronous buck converters. Furthermore, the proposed buck converter switches operation mode automatically from pulse-width modulation (PWM) mode to pulse-skipping mode (PSM). By reducing power MOS on-state resistance and optimizing rise/fall time of switches, the proposed buck converter also obtains high efficiency under heavy load condition. The maximum efficiency of the proposed buck converter is 92.9%, implemented with 0.35[Formula: see text][Formula: see text]m BCDMOS 2P3M process, and the total size is 1.1[Formula: see text] 1.2[Formula: see text]mm2. The input range and output range of the converter are 6–30 V, and ([Formula: see text]–3) V, respectively, with the maximum output current of 3 A. Moreover, its built-in current loop leads to good transient response characteristics. Therefore, it can be used widely in communication system and 12 V/24 V distributed power system.

The High Efficiency Control Method of PMSMs Based on Gradient Descent Algorithm

2021 ◽  
Author(s):  
Zaixun Ling ◽  
Hao Chen ◽  
Cheng Cheng ◽  
Kang Shuai ◽  
Jingwen Zheng ◽  
...  
Keyword(s):  
Gradient Descent ◽  
High Efficiency ◽  
Control Method ◽  
Descent Algorithm ◽  
Gradient Descent Algorithm ◽  
Efficiency Control
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