| 引用本文: | 赵洪山,程亮亮.基于双线性观测器的双馈风电机组变流器功率管开路故障诊断[J].电力自动化设备,2017,37(3): |
| ZHAO Hongshan,CHENG Liangliang.Open-circuit fault diagnosis based on bilinear observer for converter power-switch of doubly-fed wind turbine[J].Electric Power Automation Equipment,2017,37(3): |
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| 摘要: |
| 针对双馈风电机组变流器的开路故障，提出一种基于双线性观测器的故障诊断方法。从双馈感应发电机和变流器的数学模型出发，根据模型的非线性特点，推导双馈风电机组变流系统的双线性模型，并构造出变流系统的双线性电流观测器。通过电流观测器得到变流器的电流残差信息，并据此对变流器进行故障检测，然后利用电流平均值定位出具体故障器件。考虑到功率管开关延时、死区时间及测量噪声的影响，设计自适应阈值进行故障判断，保证了诊断的鲁棒性。通过不同故障类型和电网电压跌落的仿真分析，验证了所提开路故障诊断方法的有效性和可靠性。 |
| 关键词: 双馈风电机组 风电 变流器 开路故障诊断 双线性观测器 自适应阈值 |
| DOI：10.16081/j.issn.1006-6047.2017.03.013 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51277074) |
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| Open-circuit fault diagnosis based on bilinear observer for converter power-switch of doubly-fed wind turbine |
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ZHAO Hongshan, CHENG Liangliang
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School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| A method of open-circuit fault diagnosis based on the bilinear observer is proposed for the converters of doubly-fed wind turbine. Based on the mathematical model of doubly-fed induction generator and converter, and according to its nonlinear characteristic, a bilinear conversion system model of doubly-fed wind turbine is derived and a bilinear observer of conversion system is established. The converter residual current obtained by the observer is used to detect the fault and the mean value of phase current is used to locate the faulty component. With the consideration of power-switch delay, dead-time and measurement noise, the adaptive threshold is designed for the open-circuit fault diagnosis to guarantee its robustness. The results of simulations for different fault types and different grid voltage sags show the effectiveness and reliability of the proposed method. |
| Key words: doubly-fed wind turbine wind power electric converters open-circuit fault diagnosis bilinear observer adaptive threshold |
