Control Method for the Valve-side Single-phase-to-ground Faults on the Transmission Side of Symmetrical Bipolar Offshore Wind Power Based on System Parameter Optimization
Control Method for the Valve-side Single-phase-to-ground Faults on the Transmission Side of Symmetrical Bipolar Offshore Wind Power Based on System Parameter Optimization
In order to address the problem of coexistence of overvoltage,overcurrent,and voltage drop at the wind farm grid connection point caused by single-phase grounding faults on the transformer side of the offshore wind power system,we put forward a stress control method for symmetrical bipolar offshore wind power system faults based on system pa-rameter optimization.Firstly,we constructed a mathematical model for the converter valve and a control model for wind turbines,and revealed the overvoltage,overcurrent and the voltage drop characteristics of the converter valve after faults and their impact on the wind farm grid connection points.Secondly,on the basis of the impact mechanism of system key parameters on post fault voltage and current,we proposed a fault stress control scheme based on system parameter opti-mization.By optimizing the configuration of system key parameters,the control of overvoltage,overcurrent,and low voltage can be realized,significantly extending the safe operation time after system faults and improving the voltage at the wind farm grid connection point.Finally,we verified the effectiveness of the proposed method in regulating system fault stress through simulation analysis of a flexible DC system for symmetrical bipolar offshore wind power.This meth-od can provide support for the optimization design of offshore wind power.
关键词
优化/对称双极/海上风电/阀侧单相接地故障/过电压/过电流/并网点电压
Key words
optimization/symmetrical bipolar/offshore wind power/valve side single phase to ground fault/overvoltage/overcurrent/voltage of point of interconnection
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