不平衡电网下自同步虚拟同步机拓展功率控制策略研究Extended Power Control Strategy of Self-synchronized Virtual Synchronous Generator Under Unbalanced Power Grid
王仰铭;孙丹;年珩;王霄鹤;
摘要(Abstract):
虚拟同步机控制策略因其能为电网提供惯性和频率支撑的特性被广泛应用于新能源发电系统并网接口,但其在不平衡电网下的运行能力不足。为提高虚拟同步机在不平衡电网下的自同步并网能力和输出功率的电能质量,文章提出一种不平衡电网下基于拓展功率的自同步虚拟同步机控制策略。首先研究拓展功率和传统功率的关系,并提出一种适用于虚拟同步机控制的拓展功率理论。然后分析将拓展功率理论应用于自同步虚拟同步机策略的可行性,并研究一种拓展功率谐振控制方法,使虚拟同步机在不平衡电网中可以实现对传统和拓展功率的精确控制。在此基础上,提出一种基于拓展功率的自同步虚拟同步机控制策略,通过选择不同的功率组合作为控制变量,可实现不平衡电网下虚拟同步机的精准自同步并网和3种不同的功率控制模式。实验结果验证了所提控制策略的有效性。
关键词(KeyWords): 拓展功率;自同步策略;不平衡电网;虚拟同步机
基金项目(Foundation): 浙江省自然科学基金项目(LZ18E070001);; 青海省科技计划重大科技专项(2018-GX-A6)~~
作者(Author): 王仰铭;孙丹;年珩;王霄鹤;
Email:
DOI: 10.13335/j.1000-3673.pst.2020.0477
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