摘要
为了省去直驱式永磁同步风力发电机组D-PMSG(direct-drive permanent magnet synchronous genera-tors wind turbine)串接的交-直-交变流器,减少初期投资费用,文中设计了D-PMSG并网控制策略。通过对交-直-交变流器的控制,使发电机定子电压与低频母线电压满足准同期并网条件时,短接串连在主电路中的双PWM变流器,将发电机定子直接连接在箱式变压器上,电能以低频传输到背靠背换流站,在换流站变换为工频送入电网。运用PSCAD/EMTDC软件仿真了两台机组的并网过程,并分析了并网控制策略的经济成本,结果表明这种并网方法具有一定的可行性。
The control strategy of D-PMSG grid-connection was designed in order to save AC-DC-AC convertor and redu-ce initial investment costs. When the stator voltage and low-frequency bus voltage were satisfied on the condition of qu-asi-synchronization the AC-DC-AC converter was shorted in the main circuit by controlling the AC-DC-AC double PWM convertor. The generator stator was directly connected to box-type transformer. Then the low-frequency power energy was transmitted to back-to-back convertor station. The power energy was converted into 50 Hz AC and transmitted into grid. Two unit generators processes were simulated by PSCAD/EMTDC,the economic costs of control strategy were ana-lyzed. The results show that the control strategy is certainly feasible.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2011年第6期121-126,共6页
Proceedings of the CSU-EPSA
基金
国家自然科学基金项目(90410019)
关键词
风力发电
直驱式永磁同步风电机组
并网控制
变流器
wind power generation
direct-drive permanent magnet synchronous generator wind turbine
control strategy of grid-connection
convertor
