基于电流源型变流器的新型海上风电场组网系统

A new offshore wind farm network system based on current source converter

由于海上风电场的特殊性,传统基于电压源型变流器的风电场组网系统存在成本高、需要海上变电站的问题。针对该问题,提出一种基于电流源型变流器的新型海上风电场组网系统,该系统基于级联组网模式,机侧变流器和网侧变流器分别位于海上和陆地,由直流链路连接,该组网系统不需要成本昂贵和体积较大的海上变电站;其次,针对网侧变流器,设计一种带直流电流调节的有功和无功功率解耦控制方案,该控制方案无需使用远程通信链路就可以实现直流电流最小化控制。最后,通过仿真分析和实验结果验证了所提出控制方案的有效性。

Due to the particularity of offshore wind farm, the traditional wind farm network system based on voltage source converter has the problems of high cost and the offshore transformer platform need. In order to solve the existing problems, this paper presented a new type of offshore wind farm network system based on the current source converter. This system was a cascade network, and machine side converter and grid side converter were respectively located at the sea and the land, connected by the DC link. There is no need the expensive and large volume of offshore transformer platform. In addition, an active and reactive power decoupling control scheme with DC current regulation was proposed for the grid side converter. The DC current minimization control can be realized without the communication link. Finally, the effectiveness of the proposed control scheme was verified by simulation analysis and experimental results.