一种高压直流伪双极-真双极转换系统及其控制方法
By connecting the offshore wind power pseudo-bipolar DC system with the onshore true bipolar DC system through a series-type DC voltage shifter, the problems of voltage level mismatch and topology difference are solved, the cost is reduced, the system's economy and grid stability are improved, and flexible voltage adjustment is achieved.
CN122000983BActive Publication Date: 2026-07-17ZHEJIANG UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG UNIV
- Filing Date
- 2026-04-03
- Publication Date
- 2026-07-17
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Figure CN122000983B_ABST
Abstract
本发明公开了一种高压直流伪双极‑真双极转换系统及其控制方法，系统包括连接伪双极直流系统和真双极直流系统的直流电压转换装置，该装置包括两个，每个移压器包含两个MMC，分别串联在伪双极的正负两条直流线路中，交流侧并联连接实现功率交换，采用两个移压器实现伪双极到真双极的转换，两个移压器的接地点相连形成真双极对称结构。在±400kV / ±800kV应用中，每个MMC仅承受400kV电压，相比传统高压大容量直流变压器方案，子模块数量减少至66.7%。本发明为海上风电伪双极直流系统与陆上真双极直流系统的高效互联提供了创新技术方案，具有子模块数量少、成本低、灵活性高等优点，有重要的工程应用价值和经济效益。
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