A unified controlled power factor corrected DC/DC topology using magnetizing energy to reduce DC bus voltage

2004 ◽  
Author(s):  
Xiaogao Xie ◽  
J.M. Zhang ◽  
Yongjun Cai ◽  
Zhaoming Qian
Keyword(s):  
Power Factor ◽  
Dc Bus ◽  
Bus Voltage

Two-Level Grid-Connected Discharge Inverter System of Power Battery Based on LLC

2014 ◽  
Vol 1070-1072 ◽  
pp. 1278-1281
Author(s):  
Yue Yu ◽  
Qiang Yin ◽  
Meng Xue Xie ◽  
Xiao Dan Ren
Keyword(s):  
Power Factor ◽  
Constant Current ◽  
Current Loop ◽  
Loop Control ◽  
External Voltage ◽  
Power Battery ◽  
High Power Factor ◽  
Dc Bus ◽  
Bus Voltage ◽  
Battery Discharge

In order to overcome the large amounts of energy waste in the process of power battery discharge, the two-level grid-connected discharge inverter system of power battery based on LLC is designed. It is composed of LLC resonant full-bridge DC/DC and inverter. The DC-bus voltage is changed and the discharge current is stabilized by adjusting the frequency of the LLC resonant full-bridge DC/DC. The dual-loop control is applied in the inverter system. The stabilization of DC-bus voltage is achieved in the external voltage loop, while the grid-connected is implemented by controlling the grid-connected current in the inner current loop. A prototype is manufactured. The experiment results indicate that it has the characteristics of low harmonic current, high power factor and constant current discharge, and then proves that the inverter system is effective.

Analysis of a New Single-Stage Soft-Switching Power-Factor-Correction LED Driver With Low DC-Bus Voltage

2018 ◽  
Vol 65 (5) ◽  
pp. 3858-3865 ◽  
Author(s):  
Hosein Khalilian ◽  
Hosein Farzanehfard ◽  
Ehsan Adib ◽  
Morteza Esteki
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
Soft Switching ◽  
Single Stage ◽  
Led Driver ◽  
Switching Power ◽  
Dc Bus ◽  
Bus Voltage

scholarly journals Photovoltaic Maximum Penetration Limits on Medium Voltage Overhead and Underground Cable Distribution Feeders: A Comparative Study

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3843
Author(s):  
Sultan Sh. Alanzi ◽  
Rashad M. Kamel
Keyword(s):  
Power System ◽  
Power Factor ◽  
Distribution System ◽  
Power Flow ◽  
Underground Cables ◽  
Overhead Lines ◽  
Medium Voltage ◽  
Load Power ◽  
Bus Voltage ◽  
Pv Penetration

This paper investigates the maximum photovoltaic (PV) penetration limits on both overhead lines and underground cables medium voltage radial distribution system. The maximum PV penetration limit is estimated considering both bus voltage limit (1.05 p.u.) and feeder current ampacity (1 p.u.). All factors affect the max PV penetration limit are investigated in detail. Substation voltage, load percentage, load power factor, and power system frequency (50 Hz or 60 Hz) are analyzed. The maximum PV penetration limit associated with overhead lines is usually higher than the value associated with the underground cables for high substation voltage (substation voltage = 1.05 and 1.04 p.u.). The maximum PV penetration limit decreases dramatically with low load percentage for both feeder types but still the overhead lines accept PV plant higher than the underground cables. Conversely, the maximum PV penetration increases with load power factor decreasing and the overhead lines capability for hosting PV plant remains higher than the capability of the underground cables. This paper proved that the capability of the 60-Hz power system for hosting the PV plant is higher than the capability of 50 Hz power system. MATLAB software has been employed to obtain all results in this paper. The Newton-Raphson iterative method was the used method to solve the power flow of the investigated systems.

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