| 引用本文: | 于淼,汤亚芳,黄亦欣,李君卫,冒国龙.双馈风机控制方式对继电保护影响的研究[J].电力系统保护与控制,2020,48(2):180-187.[点击复制] |
| YU Miao,TANG Yafang,HUANG Yixin,LI Junwei,MAO Guolong.Research on the influence of control mode of DFIG on relay protection[J].Power System Protection and Control,2020,48(2):180-187[点击复制] |
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| 摘要: |
| 双馈风机(DFIG)的接入会影响配电网继电保护的正确动作，其中控制策略的影响不可忽视。基于DFIG两相静止坐标系下的数学模型，分别建立了DFIG机侧变流器的矢量控制和直接功率控制的模型。理论分析表明当电网发生短路故障时，不同控制策略下的DFIG短路特性有着较大差异，从而对继电保护造成不利影响。从仿真结果可知，直接功率控制响应速度快，超调量大；矢量控制响应速度慢，超调量小；DFIG出口处电压下降越多，两种控制方式瞬间提供的短路电流差别越大。最后采用向转子电流参考指令中加补偿项的方法对机侧变流器矢量控制进行改进。仿真分析结果验证了改进后的矢量控制能有效地减少DFIG在故障期间对继电保护的不利影响。 |
| 关键词: 双馈风机 矢量控制 故障 电流保护 变流器 |
| DOI：10.19783/j.cnki.pspc.190252 |
| 投稿时间：2019-03-08修订日期：2019-06-21 |
| 基金项目:贵州省联合资金项目资助(LH[2017]7231) |
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| Research on the influence of control mode of DFIG on relay protection |
| YU Miao,TANG Yafang,HUANG Yixin,LI Junwei,MAO Guolong |
| (College of Electrical Engineering, Guizhou University, Guiyang 550025, China) |
| Abstract: |
| The access of DFIG will affect the correct action of relay protection in the distribution network, and the influence of control strategy cannot be ignored. In this paper, based on the mathematical model of DFIG two-phase static coordinate system, the vector control model and the direct power control model of DFIG side converter are established respectively. Theoretical analysis shows that when a short-circuit fault occurs in the power grid, DFIG short-circuit characteristics under different control strategies have great differences, thus causing adverse effects on the relay protection. Simulation results show that the direct power control has fast response speed and large overshoot. The response speed of vector control is slow and the overshoot is small. The more voltage drops at the outlet of DFIG, the greater the difference is in short circuit current provided by the two control modes in an instant. At last, the vector control of the converter on the machine side is improved by adding a compensation term to the rotor current reference instruction. Simulation analysis results show that the improved vector control could effectively reduce the adverse effect of DFIG on the relay protection during the fault. This work is supported by Joint Fund Project of Guizhou Province (No. LH[2017]7231). |
| Key words: DFIG vector control fault current protection converter |
