| 引用本文: | 周步祥,董申,林楠,等.计及撬棒电路的双馈风电机组二次骤升故障穿越特性分析[J].电力系统保护与控制,2019,47(5):152-159.[点击复制] |
| ZHOU Buxiang,DONG Shen,LIN Nan,et al.Analysis of double-fed wind turbine's secondary high voltage ride-through characteristics considering the crowbar circuit[J].Power System Protection and Control,2019,47(5):152-159[点击复制] |
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| 摘要: |
| 风电场在低电压故障穿越时，由于系统保护设计不合理，故障不能快速切除，无功补偿控制策略存在问题或风机不具备高电压穿越能力，导致低电压穿越故障发生之后出现骤升故障。针对这一工况，在考虑了电网电压骤降恢复阶段的前提下，计及了撬棒电路是否投入对双馈风电机组的影响。因此，首先建立了考虑电压骤降恢复阶段和撬棒电路的暂态数学模型，推导出未投入撬棒电路和投入撬棒电路两种情形下的定、转子电流表达式。然后详细分析了是否投入撬棒电路两种情形对二次骤升故障穿越特性的影响，得到了撬棒电路的投入条件和最优的撬棒电阻投入阻值。最后通过仿真验证，表明了推导的定转子电流表达式、投入条件及最优撬棒阻值的合理性，同时也说明了暂态模型的正确性，为分析二次骤升故障穿越特性提供了精确的模型。 |
| 关键词: DFIG 骤升故障 定子磁链自然分量 撬棒电路 投入条件 最优撬棒阻值 |
| DOI：10.7667/PSPC180283 |
| 投稿时间：2018-03-15修订日期：2018-05-17 |
| 基金项目: |
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| Analysis of double-fed wind turbine's secondary high voltage ride-through characteristics considering the crowbar circuit |
| ZHOU Buxiang,DONG Shen,LIN Nan,LIU Shuchang,YUAN Junzhong,SHI Min |
| (School of Electrical and Information, Sichuan University, Chengdu 610065, China;State Grid Sichuan Electric Power Company, Chengdu 610045, China;State Grid Huzhu Electric Power Supply Company, Haidong 810500, China;State Grid Nantong Power Supply Company, Nantong 226006, China) |
| Abstract: |
| When a wind farm crosses a low-voltage fault, due to unreasonable system protection design, the fault cannot be quickly removed, there is a problem with reactive power compensation control strategy or the fan does not have high voltage ride-through capability, resulting in a sudden rise after a low voltage ride through fault. In this working condition, this paper considers whether the crowbar circuit will affect the double-fed wind turbine under the premise of taking into account the recovery stage of the voltage sag. Therefore, this paper first establishes a transient mathematical model that considers the voltage dip recovery phase and the crowbar circuit, and derives the stator and rotor current expressions for both the crowbar circuit and the input crowbar circuit. And then it analyzes two situations whether or not the crowbar circuit is put into have influence on the secondary voltage swell fault ride-through characteristics, and obtains the input condition of the crowbar circuit and the optimal input resistance of the crowbar resistance. Finally, simulation verification shows the rationality of derived stator and rotor currents expression, the input conditions and the optimal resistance of the crowbar and illustrates the correctness of the transient model, which can provide an accurate model for the analysis of the secondary catastrophic failure traversal characteristics. |
| Key words: DFIG HVRT stator flux linkage of natural components crowbar circuit input conditions optimal crowbar resistance |
