| 引用本文: | 雷添翔,律方成,刘教民,张雷,周倜,包鑫.双馈风力发电机组惯量阻尼特性与改进附加频率控制策略[J].电力自动化设备,2022,42(4): |
| LEI Tianxiang,Lü Fangcheng,LIU Jiaomin,ZHANG Lei,ZHOU Ti,BAO Xin.Inertia and damping characteristics of DFIG and improved additional frequency control strategy[J].Electric Power Automation Equipment,2022,42(4): |
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| 摘要: |
| 大规模风电场集中并网并经高压输电线输送到负荷中心，当输电线路发生短路故障时，送端会出现短时功率过剩，当故障解除线路恢复正常运行后，系统对送端功率需求又瞬时增大。研究发现已有的双馈风力发电机组(DFIG)基于虚拟惯性控制和下垂控制的附加频率控制策略，对负荷突变引起的频率波动控制效果显著，但对于输电线路短路故障发生到解除全过程所引起的频率波动控制存在局限性。对此，提出DFIG参与系统调频的改进附加频率控制策略，根据系统频率变化规律修正DFIG常规附加频率控制中的参数，使DFIG在输电线路故障发生到解除全过程中保持有效的惯量阻尼特性，并随系统频率变化迅速调整出力，提高系统频率动态特性。最后应用MATLAB/Simulink搭建4机2区域模型进行仿真分析，结果表明：该控制策略可有效降低DFIG频率波动幅值，调频效果得到显著改善。 |
| 关键词: 双馈风力发电机组 短路故障 频率调节 变功率跟踪控制 改进附加频率控制 |
| DOI：10.16081/j.epae.202204020 |
| 分类号:TM315 |
| 基金项目: |
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| Inertia and damping characteristics of DFIG and improved additional frequency control strategy |
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LEI Tianxiang1,2, Lü Fangcheng1,2, LIU Jiaomin1, ZHANG Lei3, ZHOU Ti4, BAO Xin3
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China;2.Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defence, North China Electric Power University, Baoding 071003, China;3.China Huadian Engineering Co.,Ltd.,Beijing 100160, China;4.China Huadian Hong Kong Company Limited, Beijing 100031, China
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| Abstract: |
| Large-scale wind farms are centrally connected to the grid and sent to the load center through high-voltage transmission lines. When the short circuit fault occurs at transmission line, there will be short-term excess power at the sending end. When the fault-removed line resumes normal operation, the power demand of the system for the sending end increases instantaneously. It is found that the existing additional frequency control strategy based on virtual inertial control and droop control for DFIG(Doubly-Fed Induction Generator) has significant control effects on frequency fluctuation caused by load abrupt change, but it has limitations in the control of frequency fluctuation caused by the entire process from the short circuit fault occurrence of the transmission line to its removal. For that, an improved additional frequency control strategy for wind turbines participating in system frequency regulation is proposed. The parameters in the conventional additional frequency control for DFIGs are corrected according to the variation law of the system frequency, so that DFIG can maintain effective inertia damping characteristic during the whole process from the occurrence of short circuit fault in the transmission line to its removal, and adjust the output rapidly with the change of the system frequency to improve the dynamic characteristics of the system frequency. Finally, a four-machine two-region model is built in MATLAB/Simulink for simulation analysis. The results show that the proposed control strategy can effectively reduce the frequency fluctuation amplitude of DFIG, and the frequency modulation effect is significantly improved. |
| Key words: DFIG short circuit fault frequency modulation variable power tracking control improved additional frequency control |
