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1.浙江大学电气工程学院,浙江省杭州市 310027
2.国网浙江省电力有限公司,浙江省杭州市 310007
3.国网浙江省电力有限公司温州供电公司,浙江省温州市 325000
4.国网浙江省电力有限公司电力科学研究院,浙江省杭州市 310014
Received:06 December 2019,
Revised:2020-09-18,
Published Online:19 October 2020,
Published:25 December 2020
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汪家铭,张静,杨建华等.基于广义短路比的多馈入直流系统受端电网结构优化方法[J].电力系统自动化,2020,44(24):111-118.
WANG Jiaming,ZHANG Jing,YANG Jianhua,et al.Optimization Method of Receiving-end AC Grid Structure for Multi-infeed DC System Based on Generalized Short-circuit Ratio[J].Automation of Electric Power Systems,2020,44(24):111-118.
汪家铭,张静,杨建华等.基于广义短路比的多馈入直流系统受端电网结构优化方法[J].电力系统自动化,2020,44(24):111-118. DOI: 10.7500/AEPS20191206002.
WANG Jiaming,ZHANG Jing,YANG Jianhua,et al.Optimization Method of Receiving-end AC Grid Structure for Multi-infeed DC System Based on Generalized Short-circuit Ratio[J].Automation of Electric Power Systems,2020,44(24):111-118. DOI: 10.7500/AEPS20191206002.
大规模直流多点馈入导致受端交流系统电压支撑能力相对变弱,电压稳定问题突出。因此亟须提升受端交流系统强度,但这在加强交流系统电气联系的同时也加剧了短路电流水平。受端交流系统的结构同时影响系统强度和短路电流水平,优化系统结构有助于协调系统强度与短路电流水平之间的矛盾。基于广义短路比的灵敏度分析和支路追加法,文中提出了一种电网结构优化方法。首先,分析了广义短路比和短路电流水平之间的变化关系;其次,研究了交流系统结构调整对上述2项指标的影响,分析了协调2项指标后的系统结构调整综合效益;最后,对不同直流落点进行分类,给出相应的受端交流系统结构优化调整策略。仿真算例验证了所提策略的可行性和有效性。
Large-scale multi-infeed direct current (MIDC) systems lead to the relatively weak voltage support capability in receiving end AC systems
resulting in severe voltage stability issues. Although
it is critical to enhance the strength of the AC system
it may exacerbate the short-circuit current level. The structure of the receiving-end AC system affects both system strength and short-circuit current level. Since optimizing the grid structure of the MIDC system can deal with the contradiction between system strength and short-circuit current level
this paper proposes a grid structure optimization method based on the sensitivity analysis of generalized short-circuit ratio (gSCR) and the branch addition method. Firstly
the relationship between the gSCR and the short-circuit current level is explored. Secondly
the impact of AC system structure adjustment on the two indicators is studied
and the comprehensive benefits of structure adjustment after coordination of the two indicators are analyzed. Finally
the receiving-end DC terminals are classified
and corresponding optimization methods for receiving AC system structures are given. Simulation results verify the validity and effectiveness of the proposed method.
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