适用于弱电网的双馈风电机组新型故障穿越控制方法

发布时间：2018-07-31 12:50

【摘要】：弱电网下系统的电压稳定裕度较低,而风电场的故障穿越性能对系统的暂态电压稳定性有显著影响。传统的双馈风电机组故障穿越控制方法都是基于适用于强电网的定功率控制,不利于维持弱电网下的电压稳定性。提出一种适用于弱电网中双馈风电机组的新型故障穿越控制方法。这种新型控制方法基于同步控制,通过有功电流和无功电流下垂控制风电机组出口电压的角度和幅值,使双馈风电机组以可控电压源的外特性运行。该控制方法能使双馈风电机组在弱电网的对称故障和不对称故障中均提供无功和有功电流,并且能在故障清除后的重励磁暂态过程中提高系统的电压稳定性。该方法同样适用于需要在联网和孤网运行之间进行无缝切换的双馈风电机组。最后,通过双馈风电机组接入无穷大电网实际电网、孤网的仿真算例验证了该故障穿越控制方法的有效性及优越性。
[Abstract]:The voltage stability margin of the system under the weak electric network is low, and the fault crossing performance of the wind farm has a significant influence on the transient voltage stability of the system. The traditional fault crossing control method of the double fed wind turbine is based on the constant power control for the strong power grid, which is not conducive to the maintenance of the voltage stability under the weak electric network. A new fault crossing control method for doubly fed wind turbine in power grid. This new control method is based on synchronous control, which controls the angle and amplitude of the outlet voltage of the wind turbine through active current and reactive current droop, and makes the doubly fed wind turbine run with the external characteristics of the controlled voltage source. This control method can make the doubly fed wind turbine in weak electricity. Both the reactive power and the active current are provided in the symmetric and asymmetric faults of the network, and the voltage stability of the system can be improved during the heavy excitation transient process after the fault is removed. This method is also suitable for the doubly fed wind turbine unit that needs to be switched seamlessly between the network and the isolated network. Finally, the doubly fed wind turbine is connected to infinity. The effectiveness of the fault ride through control method is verified by a simulation example of an isolated power grid in a large power grid.
【作者单位】：浙江大学电气工程学院;陕西电力调度控制中心;国网陕西省电力公司电力经济研究院;
【基金】：国家重点研发计划资助项目(2016YFB0900104)~~
【分类号】：TM614

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