Abstract
For the high-voltage direct-current (HVDC) power transmission system of offshore wind power, dc/dc converters are the potential solution to collect the power generated by off-shore wind farms to HVDC terminals. The converters operate with high-voltage gain, high efficiency, and fault tolerance over a wide range of operating conditions. In this paper, an isolated ultrahigh step-up dc/dc converter with a scalable modular structure is proposed for HVDC offshore wind power collection. A flyback-forward converter is employed as the power cell to form the expandable electrically isolated modular dc/dc converter. The duty ratio and phase-shift angle control are also developed for the proposed converter. Fault-tolerant characteristics of the converter are illustrated through the redundancy operation and fault-ride-through tests. Redundancy operation is designed to maintain high operation efficiency of the converters and fault-ride-through operation improves the converter reliability under harsh operating conditions. Analytical studies are carried out, and a 750-W prototype with three modular cells is built and experimentally tested to verify the performance of the proposed modular dc/dc converter.
| Original language | English |
|---|---|
| Article number | 7831355 |
| Pages (from-to) | 2245-2256 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 53 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 24 Jan 2017 |
Bibliographical note
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Keywords
- DC/DC converters
- high step-up
- high-voltage direct-current (HVDC)
- scalability
- wind power generation