scholarly journals Photovoltaic Power Plant Collection and Connection to HVDC Grid with High Voltage DC/DC Converter

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3098
Author(s):  
Xinke Huang ◽  
Huan Wang ◽  
Yu Zhou ◽  
Xinlei Zhang ◽  
Yibo Wang ◽  
...  
Keyword(s):  
Power Plant ◽  
High Voltage ◽  
Control Strategy ◽  
Power Conversion ◽  
Soft Switching ◽  
Power Module ◽  
Large Capacity ◽  
Grid Connection ◽  
Plant Collection ◽  
Parallel Output

Photovoltaic (PV) power plant collection and connection to a high voltage direct current (HVDC) grid has many advantages. Compared with the traditional AC collection and grid-connection scheme, it can reduce the power conversion links and improve the system efficiency. As one of the most important devices in the application of a PV HVDC collection and grid-connection system, a high voltage, large capacity, high step-up ratio DC/DC converter is the critical technology. A DC/DC converter scheme based on a boost full bridge isolated power module cascaded in input parallel output series (IPOS) structure is proposed to meet the technical requirements of PV power conversion with high voltage, large capacity, and high step-up ratio. The operation mode of the power module is analyzed, the soft switching method is proposed, and the constraint to realize the soft switching of the power module is deduced. Aiming to resolve the problem of multi-module voltage and current equalization in a cascaded DC/DC converter, a distributed module equalization control strategy is proposed to realize the reliable operation of a power module and converter. A 5 kV/80 kW standard power module is developed, the DC/DC converter experimental platform is built, and the proposed system scheme and control strategy are verified by experiments. Based on a 14-power module input parallel output series connection, a ±30 kV/1 MW PV DC/DC converter is developed, a ±30 kV PV HVDC collection and grid-connection demonstration system is established, and the experimental test is completed to realize the stable operation of the system.

Analysis of a Novel Isolated Input-Series and Output-Series Full-Bridge Bidirectional DC/DC Converter

2013 ◽  
Vol 273 ◽  
pp. 399-403
Author(s):  
Xiao Yu Zhao ◽  
Cong Wang ◽  
Feng Yang ◽  
Su Ke Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Power Conversion ◽  
Input Voltage ◽  
Soft Switching ◽  
High Power Density ◽  
High Input ◽  
Working Principle ◽  
High Output Voltage ◽  
High Output

A novel topology of isolated input-series and output-series (ISOS) full-bridge bidirectional DC/DC converter is described in this paper for the application requirement of high input voltage and high output voltage, which can be used in the next generation medium and high voltage power conversion systems. The proposed novel isolated bidirectional DC/DC converter not only can apparently decrease the stress of the switches, but also have the advantages, such as galvanic isolation, ease of realizing soft-switching control, high power density, and so on. In this paper, working principle of the proposed DC/DC converter is discussed in detail, the corresponding equations are derived, and the soft switching implementation is discussed too. In the end, simulation is done through PSIM to certify the feasibility of the proposed DC/DC converter and accuracy of the criterion.

Research and Develop on Static Frequency Converter of Pumped Storage Power Plant

2012 ◽  
Vol 608-609 ◽  
pp. 1120-1126 ◽  
Author(s):  
De Shun Wang ◽  
Bo Yang ◽  
Lian Tao Ji
Keyword(s):  
Power Plant ◽  
Control Strategy ◽  
Large Scale ◽  
Frequency Converter ◽  
Position Estimation ◽  
Position Sensor ◽  
Storage Unit ◽  
Rotor Position ◽  
Start Up ◽  
Pumped Storage

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

Original design of field grading materials for high voltage power module applications

2020 ◽  
Author(s):  
Trong Trung Le ◽  
Zarel Valdez-Nava ◽  
Guillaume Belijar ◽  
Sombel Diaham ◽  
Lionel Laudebat ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Module ◽  
Original Design
Sign in / Sign up

Export Citation Format

Share Document