LVRT

The LVRT control principle, control model and control strategy of DFIG and D-PMSG are investigated. ( 4) The action time of the rotor crowbar and the dc-link capacitance capacity of DFIG are studied.

通过仿真计算，研究了双馈风电机组低电压保护动作时间对机组本身和风电场运行的影响及直流环节电容容量对限制过电压的影响。

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This paper builds the model of DFIG, studies the LVRT capability, analyzes the facts affecting the LVRT capability by MATLAB/ SIMULINK simulation, and discusses the ways to improve it.

分析建立了双馈风力发电机组的模型，通过使用MATLAB/SIMULINK仿真，来研究它的LVRT性能，及影响它LVRT性能的因素，探讨它的改进方案。

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With the proportion increasing of wind power generation in power grid, the power grid demand for increasingly high to wind turbine. Low-voltage through technology ( LVRT) is one important indicator.

随着风力发电在电网中的比例日益增加，电网对风电机组的要求也越来越高，低电压穿越技术（LVRT）就是其中一项重要指标。

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To prevent all turbines disconnection from inducing power impulse to the grid, it is a necessary demand that on-grid wind power generator must possess low voltage ride through ( LVRT) capability.

为防止风电场的脱网对电网造成严重的电力冲击，要求风力发电机组具备一定的低电压穿越能力。

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The request for low voltage ride through ( LVRT ) characteristic can change the cost of generator ( WTG ).

风电场低电压穿越能力对电力系统的稳定性有着重要影响.

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So the grid department proposed the LVRT ( Low Voltage Ride Through) requirement of wind turbine to keep the stability and safety of grid system in this condition.

因此，在这种情况下，为了维护电力系统运行的稳定性和安全性，电网部门提出了风力发电机组的低电压穿越要求。

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Finally, the paper introduces a new method to increase the LVRT of wind turbines by means of series dynamic braking resistors.

最后提出了利用串联制动电阻来提高风电机组的LVRT能力的新方法。

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With the rapid development of wind power generation, wind power makes up a more and more important part in the power system, LVRT ( low voltage ride-through) is increasingly concerned and studied.

随着风电场的迅速增加，风电功率在电力系统中所占比重越来越大，风电场低电压穿越问题也越来越被广泛的关注和研究。

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Currently, the new power grid rules require that wind turbines have low voltage ride through ( LVRT) capacity. When the short-circuit fault occurs, wind turbine not only can grid-connected operation, but also can provide a certain reactive power.

目前，新的电网规则均要求并网风电机组具有一定的低电压穿越能力，当电网发生严重短路故障时，并网风电机组能够不脱网运行，同时可以向电网提供一定的无功功率。

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