上海交通大学学报

上海交通大学学报

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新能源并网多电气约束有功受限机理与弱电网下满额运行条件

  

  1. 1．上海交通大学 电子信息与电气工程学院 电气工程系，上海 200240；

    2. 国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司，北京 100045
  • 出版日期:2025-02-26 发布日期:2025-02-26
  • 作者简介:张宇（1996—），博士生，从事大规模新能源并网稳定性研究。
  • 基金资助:
    国网总部科技项目“面向大电网主动支撑需求的构网型变流器控制策略与并网特性研究”（52010122004Q）

Power Transfer Limit Analysis and Weak Grid Operating Requirements of New Energy Sources Under Multiple Electrical Constrains

  1. 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Grid Jibei Electric Power Research Institute (North China Electric Power Research Institution), Beijing 100045, China
  • Online:2025-02-26 Published:2025-02-26

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摘要： 针对新能源机组在弱电网下有功传输极限问题，当前研究缺乏考虑新能源的多电气约束(最大稳态运行电流约束、并网点电压幅值范围约束)的解析分析方法。首先基于电气量等值线刻画新能源变换器在多电气约束下的静态电压可行域，推导多电气约束下有功传输极限的解析表达式；其次，分析新能源机组在弱电网中的有功传输受限机理，探讨多种参数及无功-电压控制静态特性对有功传输的影响；再次，针对在弱电网中保证额定范围内送出功率的要求，研究了确保变换器正常运行的最小参数需求，推导了满足多电气约束的无功-电压下垂系数边界范围；最后，通过PSCAD/EMTDC仿真在电网短路比为1.05的极弱电网下对所提理论方法进行了全面验证。

关键词: 新能源, 并网变换器, 静态电压可行域, 弱电网, 有功传输极限, 多电气约束

Abstract:

Regarding the active power transfer limit issues for new energy units in weak power grids, current research lacks analytical methods considering multiple electrical constraints of new energy systems, including constraints such as maximum steady-state operating current and the voltage variation range at the grid connection point. To address this, the static voltage feasible region under multiple electrical constraints is characterized through the counter lines of electrical quantities, and the analytical expressions for the active power transfer limit under multiple electrical constraints are derived accordingly. Next, the mechanism of active power transfer limit for new energy converters under weak power grids is revealed, where the influence of parameters and the Q-U characteristics is studied. Following this, to satisfy the requirement of operate in weak gird condition within the rated generation range, the minimal parameter requirement is investigated, and the optimal Q-U droop coefficient range is derived to ensure the constrains are always satisfied  Finally, the correctness of the power transfer limit function and the effectiveness of the proposed improvement method is verified through the simulations on PSCAD/EMTDC platform in an extremely weak power grid with a short-circuit ratio of 1.05.

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