基于IPST的合环装置三相不对称下耦合特性及控制策略  

Coupling Characteristic and Control Strategy for Loop Closing Device Based on Improved Phase Shifting Transformer Under Three-phase Asymmetry Condition

作　　者：杨用春[1] 唐健雄 牛超群 徐志 赵成勇[1] YANG Yongchun;TANG Jianxiong;NIU Chaoqun;XU Zhi;ZHAO Chengyong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Baoding 071003,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),河北省保定市071003 [2]云南电网有限责任公司电力科学研究院,云南省昆明市650217

出　　处：《电力系统自动化》2022年第14期158-168,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51607068);中央高校基本科研业务费专项资金资助项目(2021MS068)。

摘　　要：随着配电网供电可靠性要求的不断提高,需要合环操作实现不停电转供负荷,但电网结构日益复杂,往往在合环点处出现上级电源属于跨多级电磁环网的复杂合环场景。针对配电网复杂合环场景下合环点两侧母线存在三相不对称、电压幅相差等因素,提出了基于改进移相变压器(IPST)的合环装置结构。考虑IPST三相调相调压绕组之间的耦合特性,分析推导了三相不对称合环场景下IPST调相调压绕组合环调节变比的计算公式,提出了适用于不同不对称复杂合环场景下的控制策略。最后,基于跨多级电磁环网的复杂合环场景下某35 kV变电站10 kV侧母线三相不对称的实际情况,通过PSCAD/EMTDC仿真验证了所提基于IPST的合环装置及其控制策略的有效性。With the increasing reliability requirements of power supply in distribution networks, it is necessary to achieve non-stop load transfer by loop closing operations. However, with the increasingly complex structure of the power grid, complex loop closing scenarios often present at the loop closing point where the superior power source belongs to the cross multi-level electromagnetic loop network. Aiming at the factors such as three-phase asymmetry and voltage amplitude and phase difference of the buses on both sides of the loop closing point in the complex loop closing scenarios of distribution networks, the structure of the loop closing device based on the improved phase shifting transformer(IPST) is proposed. Considering the coupling characteristics between the three-phase phase regulation and voltage regulation windings of the IPST, the calculation equations of the loop closing adjustment ratio of the IPST phase regulation and voltage regulation windings in the loop closing scenario of three-phase asymmetry are analyzed and derived, and the control strategies applicable to different complex asymmetric loop closing scenarios are proposed.Finally, the effectiveness of the proposed IPST-based loop closing device and its control strategy is verified by PSCAD/EMTDC simulation based on the actual situation of a complex loop closing scenario of a 35 kV substation with three-phase asymmetry of bus at the 10 kV side across a multi-level electromagnetic loop network.

关 键 词：配电网 不停电转供 合环装置 改进移相变压器 三相不对称 耦合特性 

分 类 号：TM73[电气工程—电力系统及自动化]