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首页> 外文期刊>Renewable Power Generation, IET >Improved voltage control method of power system based on doubly fed wind farm considering power coupling under grid short-circuit fault
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Improved voltage control method of power system based on doubly fed wind farm considering power coupling under grid short-circuit fault

机译：基于双馈风电场的电力系统电力系统电压控制方法，考虑电网短路故障电源耦合

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摘要

The participation of wind farms in grid emergency control is considered necessary to ensure the safe and stable operation of power systems with high-proportion wind generation. The grid voltage can be improved through the power control of doubly fed wind farm (DFWF) under grid faults. However, existing methods provide reactive power within the allowable power range (APR) under internal constraints of doubly fed wind turbine (DFWT). The precise control of DFWF is difficult to achieve, and its power controllability is underutilised because of the different operation status of DFWTs and the coupling between the APR and the grid voltage. Accordingly, an improved control method of DFWF is proposed to improve the voltage under grid fault. The power characteristics of DFWF are analysed. APR is described under internal constraints. The feasible power range (FPR) of DFWT under coupling is investigated. The connotations of FPR and APR are analysed, based on which a novel idea of active control of DFWF power is proposed. The maximum and optimal voltage operation points of DFWT under wind speed and rotor speed restrictions are calculated. The improved voltage control strategy is proposed. The simulation shows that the proposed method can significantly improve the voltage through the precise control of DFWF power.
机译：风电场参与电网紧急控制是必要的，以确保高比例发电的动力系统安全和稳定运行。通过电网故障下的双送风电场（DFWF）的功率控制可以提高电网电压。然而，现有方法在双送风力涡轮机（DFWT）的内部约束下提供允许功率范围内（APR）的无功功率。 DFWF的精确控制难以实现，并且由于DFWT的操作状态和APR和电网电压之间的耦合，其功率可控性未充分利用。因此，提出了一种改进的DFWF的控制方法，以改善电网故障下的电压。分析了DFWF的功率特性。 4月份在内部约束下描述。研究了DFWT在耦合下的可行功率范围（FPR）。分析了FPR和APR的内涵，基于该提出了DFWF功率的新颖主动控制的新颖思想。计算风速下的DFWT的最大和最佳电压操作点和转子速度限制。提出了改进的电压控制策略。该模拟表明，该方法可以通过DFWF功率的精确控制显着提高电压。

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