| 引用本文: | 李 辉,季海婷,秦 星,陈耀君,刘盛权,胡姚刚,冉 立,唐显虎.考虑运行功率变化影响的风电变流器可靠性评估[J].电力自动化设备,2015,35(5): |
| LI Hui,JI Haiting,QIN Xing,CHEN Yaojun,LIU Shengquan,HU Yaogang,RAN Li,TANG Xianhu.Reliability evaluation considering operational active power variation of wind power converter[J].Electric Power Automation Equipment,2015,35(5): |
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| 摘要: |
| 针对风电变流器运行功率随机变化可能导致其可靠性降低的问题，提出考虑功率大小及波动强度变化影响的变流器可靠性多状态概率评估模型。利用多状态概率分析法，以变流器输出功率大小和波动强度作为二维状态划分因子，对应其热应力因子和温度循环因子，建立变流器的元器件故障率统一计算模型。利用变流器元器件的结温计算方法，结合雨流法提取结温循环信息，建立风电变流器子系统级的可靠性多状态概率评估模型。以某风电场SCADA信息为例，比较了不同可靠性评估模型的收敛性，并分析功率大小和功率波动强度对机侧和网侧变流器故障率的影响。结果表明，所建立的可靠性评估模型更能合理反映功率变化对器件结温均值和结温波动的影响，评估的机侧变流器故障率比网侧更大，且随着功率波动强度增加，变流器故障率也增加。 |
| 关键词: 风电 变流器 可靠性 功率波动 多状态 概率模型 故障率 评估 |
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| 基金项目:国家国际科技合作专项资助项目（2013DFG61520）；国家自然科学基金资助项目（51377184）；中央高校基本科研业务费科研专项资金资助项目（CDJZR12150074）；重庆市集成示范计划项目（CSTC2013JCSF70003） |
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| Reliability evaluation considering operational active power variation of wind power converter |
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LI Hui1, JI Haiting1, QIN Xing1, CHEN Yaojun1, LIU Shengquan1, HU Yaogang1, RAN Li1, TANG Xianhu2
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1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology，Chongqing University，Chongqing 400044，China;2.Chongqing KK-QIANWEI Wind Power Equipment Co.，Ltd.，Chongqing 401121，China
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| Abstract: |
| As the operational active power variation of wind power converter may decrease its reliability，a multi-state probability evaluation model of converter reliability is proposed，which considers the effect of active power magnitude and fluctuation. Based on the multi-state probability analysis method and with the power magnitude and fluctuation as 2-D state allocation factors，corresponding to the thermal stress factor and temperature cycling factor，a unified component failure rate calculation model is proposed for wind power converter. Combined with the rain-flow method，the junction temperature calculation method is applied to extract the information of junction temperature cycling and a multi-state probability evaluation model of subsystem reliability is thus established for wind power converter. With the SCADA information of a wind farm as an example，the convergency of proposed reliability evaluation model is compared to that of another evaluation method and the effect of active power magnitude and fluctuation on the failure rates of generator-side and grid -side converters is analyzed，which show that，the proposed reliability evaluation model can better reflect the effect of power variation on the average junction temperature and junction temperature fluctuation of components，the failure rate of generator-side converter is higher than that of grid-side converter，and the converter failure rate increases along with the increase of power fluctuation. |
| Key words: wind power electric converters reliability power fluctuation multi-state probability model failure rate evaluation |
