利用DVR提高风电场低电压穿越能力

Low-voltage ride-through capability for wind generators based on dynamic voltage restorers

分析了动态无功补偿器(DVR)在传统负荷和风机上应用的区别,将传统DVR的储能装置改为吸能装置,应用在风电场中提高风电机低电压穿越(LVRT)能力。通过比较分析DVR常用补偿策略在风机负荷应用的优缺点,选择了适合风机的同相补偿法。理论分析和PSCAD仿真表明,DVR能够在电网故障过程中保持风电机机端电压不变,将风机和故障隔离,极大的提高了风电机低电压穿越能力。

By analyzing the distinction between traditional load and Wind Generator, this paper describes a solution for Low-Voltage Ride-Through Capability for Wind Generators based on the use of a Traditional Three single-phase structure dynamic voltage restorer whose Energy storage has been replaced by energy absorption devices. Through a comparative analysis about advantages and disadvantages of common compensation strategies was applied in wind farm, selec- ting the in-phase compensation method which is appropriate for Wind Generator. Theoretical analysis and PSCAD simulation indicate that DVR able to maintain the terminal voltage constant during fault, isolating Wind Generator and fault, greatly improve Low-Voltage Ride-Through Capability of Wind Generator.