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计及特征约束的南方电网主网架动态等值方案
朱林1, 陈达1, 张健1, 李清2
1.华南理工大学 电力学院,广东 广州 510640;2.中国南方电网超高压输电公司 检修试验中心,广东 广州 510663
摘要:
南方电网的不断发展变化对动态等值提出了更高的要求,系统的等值方案必须要考虑特征变化的影响。分析了交流系统支撑能力、异步运行方式以及高比例可再生能源并网对动态等值的影响,提出了相应的等值原则。以南方电网为对象,提出了考虑特征约束的主网架优化等值方案:通过多馈入有效短路比判别交流系统的支撑强度并修正等值保留范围,考虑接线方式与电气距离的约束,提出划分同调机群的新原则,然后调整等值机调速器的参数使其频率特性与等值前相同,并对可再生能源机组进行合理的分群等值以保留其动态特性。根据所提评价标准对等值方案进行验证评估,仿真结果表明,所考虑的关键影响因素具有合理性和必要性;与传统方案相比,所提等值方案更加合理、有效。
关键词:  交直流混联系统  动态等值方案  特征约束  主网架  评价标准
DOI:10.16081/j.epae.201909008
分类号:TM74
基金项目:国家自然科学基金资助项目(U1766213)
Dynamic equivalent scheme for main grid of China Southern Power Grid considering feature constraints
ZHU Lin1, CHEN Da1, ZHANG Jian1, LI Qing2
1.School of Electric Power, South China University of Technology, Guangzhou 510640, China;2.Maintenance & Test Center, CSG EHV Power Transmission Company, Guangzhou 510663, China
Abstract:
The constant development and change of China Southern Power Grid put forward higher requirements for dynamic equivalence, so the equivalent scheme of the system must consider the influence of feature changes. The influence of the support capacities of AC systems, the asynchronous operation modes and the grid-integration of high proportion of renewable energy on dynamic equivalence is analyzed, and the corresponding equivalent principles are put forward. Taking China Southern Power Grid as the example, an optimal equivalent scheme of main grid framework considering feature constraints is proposed. The support strength of AC system is determined by MIESCR(Multi-Infeed Effective Short Circuit Ratio) and the equiva-lent retention range is modified. Considering the restriction of connection mode and electrical distance, a new division principle of coherent generator group is proposed. Then the parameters of the equivalent governors are adjusted to make its frequency characteristics same as before, and the renewable energy generators are reasonably grouped and equivalent to retain their dynamic characteristics. The equivalent scheme is verified and evaluated according to the proposed evaluation standard. Simulative results show that the key influencing factors are reasonable and necessary. Compared with the traditional schemes, the proposed equivalent scheme is more reasonable and effective.
Key words:  AC-DC hybrid system  dynamic equivalent scheme  feature constraints  main grid  evaluation standard

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