What are the main reasons for the wind turbine off the net?

What are the main reasons for off-grid wind turbines? Large-scale wind turbines are often exposed to harsh environments and are exposed to the sun and rain. Therefore, large-scale wind-breaks occur frequently, which seriously affects the normal operation of power generation. Therefore, this paper briefly introduces large-scale wind turbines. The main treatment measures after the network accident.

First, wind turbines and wind farms meet the grid-connected technical requirements, and having LVRT is the key to curb the large-scale off-grid accidents of wind turbines. New grid-connected units must have LVRT, and grid-connected wind turbines must be rectified according to the required plan. If the LVRT retrofit is not available, it must be confirmed that the basic fan operation requirements are met. If the voltage drop at the grid point is less than 0.8 pu, a tripping operation of 0.1 to 0.2 s is required, as shown in Figure 1, and most of the grid transient faults can be traversed. The wind farms LVRT that have been connected to the grid should be combed and tested. Wind farms that do not have qualified LVRT should be reconstructed within the stipulated deadline and spot-checked by LVRT. Wind turbines on large-scale concentrated access points should be prioritized. Transformation. Manufacturers should actively cooperate with the site to negotiate specific transformation plans and implement them immediately. Open fan control and protection settings, optimize the cooperation between fan protection and fan control system, and coordinate the fan master control system and LVRT function.

Second, deal with all hidden troubles in the network cables, cable heads and switchgears, and complete the high and low pressure tests according to the regulations. Strengthen the operation and maintenance management of cables, switchgears, and switchboards, improve the monitoring methods, and configure inspection equipment or equipment such as infrared and ultraviolet imagers to ensure the timely and accurate detection and elimination of hidden dangers. In addition, in view of the current problem of low price bids affecting product quality, it is recommended that wind farms strictly control the procurement process of equipment materials, and try to use large-scale enterprises or products that can produce higher voltage grade cable accessories to prevent unqualified products from running on the network.

Third, when the neutral point is ungrounded or arc-extinguishing coil grounding system, the faulty line and ungrounded line only flow through a weak capacitive current, and it is impossible to accurately determine that the line is grounded, which makes it difficult to find and repair the ground. The line selection effect based on the principle of amplitude, direction, etc. of fundamental zero-sequence current is not very good. The wavelet-based single-phase line selection for traveling wave [13-14], making full use of current traveling wave in the power grid to perform fault line selection is a breakthrough in the principle of fault line selection, providing new ideas and new ideas for it. The program's actual operation proves that it is expected to fundamentally solve the fault line selection problem of the small-current system, thereby realizing quick and reliable line selection and timely tripping, which can prevent the fault from expanding.

Fourthly, electric power workers should conscientiously implement the “Key Measures for Preventing Large-scale Off-grid Wind Power Offsets” by the State Grid Corporation of China [15], strengthen the operation and management of dynamic reactive power compensation equipment, deal with defects in time, and renovate them to realize the dynamic part of reactive power compensation equipment. The automatic adjustment function can be used to automatically switch the filter branch to ensure that it is put into operation in strict accordance with the scheduling requirements. Strengthen on-grid wind farm dispatching and operation management, conduct on-site inspections of wind power plants involved in power grid protection, reactive power compensation, fan information uploading, dispatch operation duty, basic management, etc. Wind farms that do not meet the standard requirements are not With grid, series resonance WWW.HB1000KV.COM.

Wind power generation is not only energy saving and environmental protection, but also has a relatively high efficiency. In recent years, more and more attention has been paid to the country. Wind power generation in China has also entered a new historical stage. Therefore, electric power workers should start from actual conditions and continuously summarize experience. Improve the operation and maintenance capabilities of wind turbines and ensure the normal operation of wind power generation.