Research on voltage control method of multi-wind farms under grid asymmetric faults
Wind farms are often located in the rural power grid with inverse distribution characteristics to the load center.As a result,wind power generation systems have poor voltage support capability under asymmetric short-cir-cuit fault conditions,and the low-voltage operation adaptability of wind turbines is severely challenged.Therefore,it is necessary to study the control methods to improve the low-voltage operation adaptability of multi-wind power systems under grid faults,aimed at wind power grid-connection guidelines.Firstly,this paper establishes the posi-tive and negative sequence equivalent circuit of the multi-wind power system,and analyzes the factors affecting the voltage at the common connection point of the system.Secondly,the constraints of single wind farm voltage control under asymmetric faults are analyzed,and then a cooperative control method of multi-wind power systems transient voltage is proposed,with the goal of improving the low voltage operation adaptability of wind power generation sys-tems with different operation scenarios.Finally,a multi-wind farm transient voltage control simulation model is es-tablished,and the simulation results show that the proposed scheme can effectively improve the transient voltage level at the common connection point,and flexibly achieve the maximum wind energy tracking,which laying the foundation for effectively improving the low-voltage operation adaptability of multi-wind power systems.
asymmetric short-circuit faultguideline of connecting wind farm to power systemtransient voltage levellow-voltage operation adaptabilitycooperative control method of transient voltage
万方数据
维普
