并网型中压变流器高频谐振抑制策略

发布时间：2018-01-22 07:36

本文关键词： 风力发电兆瓦级中压变流器高频谐振抑制虚拟阻尼网侧变流器电流　出处：《电力系统自动化》2017年23期 　论文类型：期刊论文

【摘要】：电感—电容—电感(LCL)逆变器接入弱电网时存在高频谐振风险,一般采用滤波电容电流作为状态变量的虚拟阻尼技术实现高频谐振抑制。针对风电用中压变流器滤波电容电流采集受限的特点,提出一种采用网侧变流器电流作为状态变量的虚拟阻尼方法,同时采用带通滤波加相位补偿方式对虚拟阻尼进行优化,满足闭环系统低频段增益要求,同时补偿数字系统控制延迟的影响。最后,以实际中常见的弱电网起机加载和满功率运行时突遇弱电网两种典型工况对高频谐振策略进行仿真与试验验证。
[Abstract]:There is a risk of high frequency resonance when the inductor-capacitor-inductor LCL) inverter is connected to the weak current grid. In general, the virtual damping technique with filter capacitor current as the state variable is used to achieve high frequency resonance suppression, aiming at the limited characteristics of filter capacitor current acquisition in the middle voltage converter for wind power. A virtual damping method using the current of the grid-side converter as the state variable is proposed, and the bandpass filter and phase compensation are used to optimize the virtual damping to meet the low frequency gain requirements of the closed-loop system. At the same time, the control delay of digital system is compensated. Finally, the high frequency resonance strategy is simulated and tested under two typical working conditions, namely, weak grid loading and full power operation.
【作者单位】：中国科学院电工研究所;中国科学院大学;科诺伟业风能设备(北京)有限公司;
【分类号】：TM46
【正文快照】： 3.科诺伟业风能设备(北京)有限公司,北京市100083)上网日期:2017-05-31。0引言中国海上风能资源丰富,建设海上风电场对于缓解能源紧缺现状具有重要意义[1]。海上特殊环境对大容量风电机组提出明确需求,国家在“十二五”期间对风电用5 MW和7.5 MW中压风电变流器进行了专项支持

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