双馈风电场接入对送出线路继电保护的影响及改善措施
[Abstract]:In the face of the increasingly severe problems of fossil energy depletion and environmental pollution in the world, wind power generation, as one of the important representatives of renewable energy generation, has been developed rapidly in recent years, among which doubly-fed wind turbines have high energy conversion efficiency. It is easy to realize active power and reactive power decoupling control and has been widely used in wind farms. The wind power in our country is mainly centralized large-scale grid connection, which has the characteristics of cluster development, weak power network access, long distance outgoing transmission. The unique fault characteristics of wind power bring new problems to the distance protection and reclosing of the transmission line. Therefore, it is of great significance to study the influence of doubly-fed wind farm access on transmission line relay protection and its improvement measures for improving the operational reliability of relay protection, enhancing the ability of power grid to resist faults, and ensuring the safe and stable operation of power network. In this paper, the operation principle and control strategy of doubly-fed wind turbine are studied at first. Combined with the typical grid-connected structure of doubly-fed wind farm, the detailed model and equivalent model of doubly-fed wind farm are built in DIg SILENT/Power Factory. The feasibility of model equivalence is verified under steady state and fault transient conditions. The impedance characteristic, weak feed characteristic and current non-power frequency characteristic of doubly-fed wind farm are analyzed theoretically. Based on the equivalent model of doubly-fed wind farm, the voltage and current characteristics of wind farm under different types of fault are simulated. It is proved that the theoretical analysis of the fault characteristics of wind farm is correct. Then, according to the fault characteristics of the doubly-fed wind farm, the influence of the doubly-fed wind farm access on the distance protection of the transmission line is studied. The additional impedance in the measurement impedance of the distance protection may cause the distance protection to refuse or malfunction, especially on the wind farm side. Because the zero sequence impedance is far less than the positive and negative sequence impedance, the earthing impedance element can withstand more transition resistance than the phase impedance element, and the input of the prying rod resistance will further reduce the transition resistance ability of the phase impedance element. Under the influence of non-power frequency characteristics of fault current, the inconsistent frequency of voltage and current will lead to measurement impedance fluctuation, which may prolong the protection operation time. When the fault is near the protection range boundary, the protection may refuse to operate or misoperate. In this paper, a distance protection scheme based on bilateral phase current and fault phase selection and fault type criterion are proposed. The scheme is not affected by the non-phase operation and oscillation of the system. The three-phase current measured by the distance protection device on the opposite side of the transmission line can only be transferred to the local side through the installed longitudinal differential channel, which is of high practicability. Finally, in view of the influence of doubly-fed wind farm access on reclosure, it is proposed that the reclosing scheme can be improved by checking and checking synchronously or self-synchronously. A reclosing time calculation method is also proposed when the output line voltage transformer is not installed or exits from operation due to breakage and so on.
【学位授予单位】:华北电力大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM614;TM77
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