DC/DC并网变流器在海上风力发电中的研究

摘要

To solve the problem that the output voltage is low and the capacity is not enough when the high power offshore wind motor is directly connected to the high voltage DC power grid,based on an input parallel output series modular DC/DC converter,a master-slave control strategy that can make the put voltage stable and the output voltage of the each sub module balanced is presented.The topology and operating principle of the converter are analyzed,and the mathematical model of DC/DC sub module is established.A double closed loop control strategy is adopted to decouple the input voltage of DC/DC converter and the output voltage of each sub module.A simulation platform of 2 MW power permanent magnet synchronous generator(PMSG) is built on the Matlab simulation platform,the simulation results show that the method is feasible and reliable,and the system has good stability and bearing capacity.%为了解决大功率海上风电机直接接入高压直流汇流电网时输出电压低及容量不够的问题,基于一种输入并联、输出串联的模块化DC/DC直流并网变流器,提出一种主从式输入电压稳压和各子模块输出均压控制策略.首先分析该变流器的拓扑结构及工作原理,并建立DC/DC子模块数学模型.然后采用一种DC/DC变流器输入电压和各个子模块输出电压解耦的双闭环控制策略.最后在Matlab仿真平台下搭建了一台功率2 MW的永磁同步发电机(PMSG)仿真平台,仿真结果验证了该方法的可行性与可靠性,且该系统具有很好的稳定性与承受能力.