| 引用本文: | 邓友汉,肖志怀,程远楚,张新龙.基于DBR的交直流复用Crowbar低电压穿越[J].电力自动化设备,2014,34(6): |
| DENG Youhan,XIAO Zhihuai,CHENG Yuanchu,ZHANG Xinlong.AC-DC multiplexing Crowbar LVRT scheme based on DBR[J].Electric Power Automation Equipment,2014,34(6): |
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| 摘要: |
| 在深入分析双馈风力机组数学模型的基础上，通过对现有低电压穿越方案的控制策略和效果的研究，提出了基于动态刹车电阻（DBR）的交直流复用Crowbar低电压穿越方案。所述方案有2种工作方式：当电网电压轻度跌落时，运行于直流Crowbar工作方式；当电网电压深度跌落时，运行于交直流复用Crowbar方式。针对2 MW双馈风力发电机组进行了试验，对设计方案进行了验证。研究表明，所述方案对电网电压轻度跌落持续可控；对电网电压深度跌落，利用并联整流桥取代机侧变频器输送转子故障能量至直流母线，规避了跌落瞬间机侧变频器容量不足的缺点，至机侧变频器重启并联整流桥退出，恢复背靠背变频连接。对不同程度电网电压跌落，所述方案均能实现低电压穿越，故障期间无功支撑满足电网导则要求。 |
| 关键词: 风电 低电压穿越 动态刹车电阻 直流Crowbar 交流Crowbar 无功支撑 |
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| 基金项目:国家自然科学基金资助项目（51379160） |
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| AC-DC multiplexing Crowbar LVRT scheme based on DBR |
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DENG Youhan1, XIAO Zhihuai1, CHENG Yuanchu1, ZHANG Xinlong2
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1.School of Power and Mechanical Engineering，Wuhan University，Wuhan 430072，China;2.Renewable Energy Department of China Electric Power Research Institute，Nanjing 210003，China
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| Abstract: |
| The mathematical model of DFIG（Doubly Fed Induction Generator） wind generator is analyzed，the control strategy and effect of existing LVRT （Low Voltage Ride Through） schemes are studied，and an AC-DC multiplexing Crowbar LVRT scheme based on DBR （Dynamic Braking Resistance） is proposed，which has two working modes：DC Crowbar mode for mild grid voltage drop and AC-DC multiplexing Crowbar mode for deep grid voltage drop. The test results of a 2 MW DFIG wind generator show that，the wind turbine keeps controllable during mild grid voltage drop，while during deep grid voltage drop，the rectifier is used to replace the GSC（Ｇrid-Ｓide Ｃonverter） to transport the fault power of rotor to DC bus for avoiding the defect of insufficient GSC capacity. When GSC restarts successfully，the rectifier quits and the back-to-back con-verter recovers. The proposed scheme realizes LVRT during grid voltage drop，either mild or deep，and meets the requirements of the state grid guidelines for the reactive power support during grid fault. |
| Key words: wind power LVRT dynamic braking resistance DC Crowbar AC Crowbar reactive power support |
