scholarly journals Research on Energy Storage Interface Circuit and Its Control Principle Based on the L-LLC Resonant Bidirectional DC-DC Converter

2018 ◽  
Vol 36 (5) ◽  
pp. 926-932
Author(s):  
Ming Shen ◽  
Xiaobin Zhang
Keyword(s):  
Energy Storage ◽  
Dynamic Response ◽  
Optimal Trajectory ◽  
Hybrid Control ◽  
Power Grid ◽  
Operating Efficiency ◽  
Switching Frequency ◽  
Operation Performance ◽  
Interface Circuit ◽  
Zero Current Switching

Aiming at the low operating efficiency and poor dynamic response of energy storage interface circuit for flexible interface of connecting microgrid to power grid, the principle of PI or PID and optimal trajectory hybrid control based on the L-LLC resonant bidirectional DC-DC converter (L-LLC BDC) is proposed. It realize zero-voltage switching and zero-current switching for input switches and output rectifiers respectively, besides, it not only significantly reduce the computational complexity and further increase switching frequency, but also improve dynamic response of the converter remarkably. Using state-plane analysis, the operation status and characteristics of L-LLC-BDC are described in detail, based on that, the control system of the energy storage interface circuit is designed. In view of the principle of PI or PID and optimal trajectory hybrid control based on the L-LLC-BDC, the simulation shows that the correctness of theoretical analysis and the superiority of dynamic response and the operation performance of flexible interface of connecting microgrid to power grid is guaranteed.

Enhancing the power grid flexibility with battery energy storage transportation and transmission switching

2021 ◽  
Vol 290 ◽  
pp. 116692
Author(s):  
Hongjie He ◽  
Ershun Du ◽  
Ning Zhang ◽  
Chongqing Kang ◽  
Xuebin Wang
Keyword(s):  
Energy Storage ◽  
Power Grid ◽  
Battery Energy Storage ◽  
Transmission Switching ◽  
Battery Energy

scholarly journals Study on a Novel High-Efficiency Bridgeless PFC Converter

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Cao Taiqiang ◽  
Chen Zhangyong ◽  
Wang Jun ◽  
Sun Zhang ◽  
Luo Qian ◽  
...  
Keyword(s):  
Steady State ◽  
High Efficiency ◽  
Control Policy ◽  
Switching Frequency ◽  
Fast Recovery ◽  
Zero Current Switching ◽  
Zero Current ◽  
The One ◽  
Gain Characteristic ◽  
Conduction Mode

In order to implement a high-efficiency bridgeless power factor correction converter, a new topology and operation principles of continuous conduction mode (CCM) and DC steady-state character of the converter are analyzed, which show that the converter not only has bipolar-gain characteristic but also has the same characteristic as the traditional Boost converter, while the voltage transfer ratio is not related with the resonant branch parameters and switching frequency. Based on the above topology, a novel bridgeless Bipolar-Gain Pseudo-Boost PFC converter is proposed. With this converter, the diode rectifier bridge of traditional AC-DC converter is eliminated, and zero-current switching of fast recovery diode is achieved. Thus, the efficiency is improved. Next, we also propose the one-cycle control policy of this converter. Finally, experiments are provided to verify the accuracy and feasibility of the proposed converter.

Sign in / Sign up

Export Citation Format

Share Document