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计及新能源时变性的新型配电网聚合电源建模
作者:
作者单位:

1.河海大学电气与动力工程学院,江苏省南京市 211100;2.贵州电网有限责任公司电网规划研究中心,贵州省贵阳市 550000

摘要:

电源聚合模型对新型配电网的分析计算仍然至关重要。电力系统传统电源为机理明确、特性相近的发电机,较易建立等值聚合模型。随着高比例的新能源电源接入配电网,其时变性与非线性给电源等值建模带来了巨大挑战。首先,构建了聚合电源的模型结构,根据负荷小扰动且不考虑短时时变性,辨识模型的6个参数。其次,针对新能源电源时变性,假定模型中传统发电机内电势不变,利用Taylor公式展开功率平衡方程,解算与时变性相关的4个模型参数。针对上述4个参数构造欧氏距离,并据此判断电源侧内部是否发生时变,若是则继续利用Taylor展开法解算;若电源侧内部无时变且负荷满足小扰动要求,则再次对6个模型参数进行辨识,即适时校正电源侧时变带来的误差积累。后续可按此规则持续延展。最后,通过算例验证了所提方法的可行性与有效性,采用上述规则即可得到计及时变性的、适用于含高比例新能源配电网相关的持续分析计算的等值电源模型。

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基金项目:

国家自然科学基金重点项目(51837004)。

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作者简介:


Modeling of Aggregated Generators for New Distribution Network Considering Time-varying Characteristic of Renewable Energy
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Abstract:

Power aggregation model remains crucial for the analysis and calculation of new distribution networks. Traditional power sources in the power system are generators with clear mechanisms and similar characteristics, making it easier to establish equivalent aggregation models. As a high proportion of renewable energy sources are connected to the distribution network, their time-varying and non-linear characteristics pose a huge challenge to equivalent modeling of power sources. First, the model structure of the aggregated generator is constructed, and six parameters of the model are identified based on small disturbances of loads without considering the short-term time-varying characteristic. Then, aiming at the time-varying characteristic of renewable energy sources, assuming that the internal voltage of the traditional generator in the model remains unchanged, the Taylor formula is used to expand the power balance equation and solve the four model parameters related to the time-varying characteristic. Euclidean distance for the above four parameters is constructed and the distance is used to determine whether there is temporal variation inside the power source side. If so, the Taylor expansion method continues to be used for solving. If there is no time-varying inside the power source side and the load meets the small disturbance requirements, then six model parameters are identifed again, which can timely correct the error accumulation caused by the time-varying characteristic on the generator side. Subsequent extensions can be continued according to this rule. Finally, the feasibility and effectiveness of the proposed method are verified through numerical examples. By using the above rules, an equivalent power source model that takes into account time-varying characteristic and is suitable for continuous analysis and calculation of high proportion renewable energy connected to distribution networks can be obtained.

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Foundation:
This work is supported by National Natural Science Foundation of China (No. 51837004).
引用本文
[1]陈杉桐,陈谦,鞠平,等.计及新能源时变性的新型配电网聚合电源建模[J/OL].电力系统自动化,http://doi. org/10.7500/AEPS20230814002.
CHEN Shantong, CHEN Qian, JU Ping, et al. Modeling of Aggregated Generators for New Distribution Network Considering Time-varying Characteristic of Renewable Energy[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20230814002.
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  • 收稿日期:2023-08-14
  • 最后修改日期:2024-06-21
  • 录用日期:2024-01-29
  • 在线发布日期: 2024-07-08
  • 出版日期: