大规模新能源并网下SVG协同风电场的电压精细化控制策略研究
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作者单位:

1.云南电网有限责任公司 电力科学研究院;2.西南交通大学 电气工程学院;3.云南电力调度中心

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TM761

基金项目:

国家自然科学基金项目(51777176);云南电网有限责任公司科技项目(056200KK52180067)


Research on meticulous voltage cooperative control strategy between SVG and wind farm under the large-scale new energy grid connection
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Affiliation:

1.Electric Power Research Institute, Yunnan Power Grid Co., Ltd;2.Southwest of JiaoTong University;3.Yunnan Power Dispatch Center

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    摘要:

    新能源大规模并网下,区域电压合格率降低的问题越来越显著,其主要原因是新能源自身不稳定性和有待改进的控制策略。本文以提高区域电压精度和稳定性为目的,详细计算了DFIG无功限度,并考虑过电流因素,进一步更正了DFIG无功下限。改进了DFIG机组控制结构,将GSC无功容量计入DFIG无功补偿中,使风电场在保留最大有功的同时,深度发掘无功潜能,提高风电场无功补偿能力,并结合SVG设计出协调控制策略,既能保留SVG灵活补偿能力,又可使风电场提供无功支撑,分担SVG补偿负担。最后通过分析灵敏度、无功裕度等参数,设计区域无功调配策略,进一步完善电压精细化控制策略,并通过两区域并网系统验证整套控制理论。

    Abstract:

    Under the large-scale grid connection of new energy, the problem of the reduction of the regional voltage qualification rate is becoming more and more obvious. The main reason is the instability of the new energy itself and the control strategy that needs to be improved. In order to improve the accuracy and stability of the regional voltage, this paper calculates the DFIG reactive power limit in detail, and considers the overcurrent factor to further correct the DFIG reactive power lower limit. The DFIG control structure is improved, and the GSC reactive power capacity is included for the DFIG reactive power compensation, so that the wind farm retains the maximum active power while deeply exploring the reactive potential, thereby improving the reactive power compensation capability of the wind farm. In addition, a coordinated control strategy is designed in combination with SVG, which can not only retain the flexible compensation capability of SVG, but also enable the wind farm to provide reactive power support and share the burden of SVG compensation. Finally, by analyzing parameters such as sensitivity and reactive power remaining, this paper designs a regional reactive power allocation strategy, further improves the voltage fine control strategy, and verifies the entire set of control theory through the two-region grid-connected system.

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  • 收稿日期:2020-12-04
  • 最后修改日期:2021-03-04
  • 录用日期:2021-04-14
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