| 引用本文: | 刘英培,杨博超,石金鹏,朱宇琦.含ISOP-DAB变换器的中低压直流配电系统阻抗建模及稳定性分析[J].电力自动化设备,2023,43(2): |
| LIU Yingpei,YANG Bochao,SHI Jinpeng,ZHU Yuqi.Impedance modeling and stability analysis of MV/LV voltage DC distribution system with ISOP-DAB converter[J].Electric Power Automation Equipment,2023,43(2): |
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| 摘要: |
| “双碳”目标下，高比例可再生能源和高比例电力电子设备成为中低压直流配电系统的主要特征，使得系统因其低惯量、弱阻尼的特性所引起的稳定性问题尤为突出。为此，针对含输入串联输出并联型双有源桥(ISOP-DAB)变换器的中低压直流配电系统进行阻抗建模并提出一种适用于中低压直流配电系统的稳定性分析方法。首先，建立了ISOP-DAB变换器的二端口阻抗模型以及其他单元的阻抗模型。在此基础上根据系统内各单元的端口特性将中低压直流配电系统等效为2个单母线直流子系统，并得到整个系统在中、低压侧的等效阻抗比，当且仅当该等效阻抗比满足奈奎斯特判据时，系统可稳定运行。最后，基于PSCAD/EMTDC平台搭建了含ISOP-DAB变换器的中低压直流配电系统的时域仿真模型，通过仿真实验以及理论计算对比分析了恒功率负载及线路参数对系统稳定性的影响。仿真结果验证了ISOP-DAB变换器的小信号模型以及所提稳定性分析方法的准确性和有效性。 |
| 关键词: 中低压直流配电系统 ISOP-DAB变换器 阻抗模型 稳定性分析 小扰动稳定 |
| DOI：10.16081/j.epae.202208050 |
| 分类号:TM712 |
| 基金项目:国家自然科学基金资助项目(51607069) |
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| Impedance modeling and stability analysis of MV/LV voltage DC distribution system with ISOP-DAB converter |
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LIU Yingpei, YANG Bochao, SHI Jinpeng, ZHU Yuqi
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School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| Under the “dual-carbon” target, high proportion of renewable energy and power electronic equipment have become the main characteristics of medium voltage and low voltage(MV/LV) DC distribution system, which makes the stability problems caused by its low inertia and weak damping particularly prominent. Therefore, the impedance modeling of MV/LV DC distribution system with input series output parallel-dual active bridge(ISOP-DAB) converter is carried out and a stability analysis method suitable for the system is proposed. Firstly, the two port impedance model of ISOP-DAB converter and the impedance model of other units are established. On this basis, according to the port characteristics of each unit in the system, the MV/LV DC distribution system is equivalent to two DC subsystems with single bus, and the equivalent impedance ratio of the whole system on the medium and low voltage side is obtained. If and only if the equivalent impedance ratio meets the Nyquist criterion, the system can operate stably. Finally, the time-domain simulation model of MV/LV DC distribution system with ISOP-DAB converter is built based on PSCAD/EMTDC. The effects of constant power loads and DC line parameters on system stability are compared and analyzed through simulation experiment and theoretical calculation. The simulative results verify the accuracy and effectiveness of the small signal model of ISOP-DAB converter and the proposed stability analysis method. |
| Key words: MV/LV DC distribution system ISOP-DAB converter impedance model stability analysis small disturbance stability |
