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Jiuquan million kilowatts of wind power off-grid: a little trouble from the cable head

    [REVIEW] In the past two months, the fourth wind of this place known as the land in "wind power three gorges" of the million kilowatts of wind power base, actually "stumble" in a small cable head by This led to the largest wind power in the history of the fan off Wangshi it.

    April 24, Gansu Jiuquan, the highest temperature reached 27 degrees during the day, but in the 3-4 level westerly breeze, ratchet tie dowm still feel fresh and comfortable.

    For the year the wind farm Pan Cong stationed Tiger, this is the best moment: neither be as cold as the bitter winter cold, dry winds in summer are not as worried about income. However, as water Construction Group Gansu Jiuquan wind power base in the fourth wind farm Guazhou dry mouth the head of the farm, at the moment in front of him and enjoy the pleasant mood.

    Over the past two months, the fourth wind of this place known as the land in "wind power three gorges" of the million kilowatts of wind power base, actually "stumble" in the head of a small cable, and thus led to wind power in the history of the largest fan off Wangshi it.

    Accident occurred on Feb. 24, according to local meteorological records, Jiuquan weather is cloudy, the temperature was 9 degrees to -5 degrees, wind 3-4. This early morning start, the Pan Cong tiger was on duty told, on 0:34 Xu, wind fan, boost the power lines, etc. have issued an alert due to voltage instability. That time, the PAN has not got the idea, because "more than a year in the past, such incidents have occurred."

    But until that afternoon, Pan Fu Cong know the power grid voltage fluctuations affect how much: Jiuquan wind power base of 840,000 kilowatts, 598 typhoons have been off-grid power units, de Wangshi it cause voltage fluctuations, and even spread to Gansu Power Grid, pose a threat to the entire Northwest Power Grid.

    Subsequently, the State Electricity Regulatory Commission in conjunction with the Chinese Academy of Sciences EPRI experts to investigate the cause of the accident, and was held at the April 1 incident briefing. Investigation concluded that the main reason for the accident has been put into operation the wind turbine does not have low voltage ride through capability. In addition, some owners of project quality management and wind farm operation flawed, for the power grid is not allowed without permission only by reference to the safety evaluation of grid access to wind farms.

    State Electricity Regulatory Commission refused to disclose more details of the incident investigation, claiming it is to protect China's wind power industry. But concern about the development of wind power industry, the people concerned, which has led to more speculation and concern.

    Low voltage across the threshold of how high technology?

    Who pays the bill for this incident?

    Jiuquan wind power base in the follow-up to the rectification?

    Power can not be strong?

    Wind power industry in the future going?

    ... ...

    Accident causes: lack of low-voltage ride through capability

    The fan base mainly from the Jiuquan Sinovel, Goldwind and Dongfang Electric

    Head from the accident to begin with a small cable.

    At 0:34 on February 24, CPI Guazhou Gansu Jiuquan wind power base in the sixth dry mouth wind farm 35 kV switchgear feeder cable under the side of the head relative to the casing C grounded breakdown occurs. 11 seconds, the evolution of the three-phase short circuit fault, Dunhuang fell to 330 kV 272 kV bus voltage transient. Subsequently, the off-grid wind turbine wind farm and other areas of the Jiuquan Guazhou 10 298 wind turbine wind farm off the network quickly.

    Because wind power output decline, causing the system voltage increases, Dunhuang bus voltage of 330 kV to 380 kV maximum transient. Because the voltage is too high, the other six regions Guazhou 300 wind turbine wind farm off the network and therefore.

    This reporter learned that, as of 2010, the Jiuquan wind power installed capacity of 516 million kilowatts.

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