基于无源阻尼的直流微电网稳定性分析

发布时间：2018-04-12 08:07

本文选题：直流微电网 + 分层控制　；参考：《高电压技术》2017年09期

【摘要】：多变换器与负载交互所引起的稳定性问题已成为直流微电网领域的一个研究热点,但目前稳定性研究大多集中在单一控制的直流微电网,缺乏普适性。针对母线电压分层控制下的直流微电网稳定性问题,建立了各接口变换器在不同控制下的小信号模型和直流微电网等效阻抗模型,并利用阻抗比判据判定直流微电网3种模式的小信号稳定性,将稳定性最差的模式作为直流微电网系统稳定性的判定指标。采用无源阻尼法,通过增加阻尼电阻改善了负载阻抗特性,使直流微电网的稳定性得到提高并得出滤波参数对稳定性的影响规律。研究结果表明:模式2下直流微电网稳定性最差,在添加了12?阻尼电阻后,幅值裕量增加了12.7 d B,相角裕量增加了11.5°。因此无源阻尼可改善负载阻抗特性,从而提高直流微电网稳定性。
[Abstract]:The stability problem caused by the interaction of multi-converter and load has become a research hotspot in the field of DC microgrid, but most of the research on stability is focused on the single-controlled DC micro-grid, which is lack of universality.Aiming at the stability of DC microgrid under bus voltage stratified control, the small signal model and equivalent impedance model of each interface converter under different control conditions are established.The impedance ratio criterion is used to determine the small signal stability of the three modes of DC microgrid, and the worst stability mode is taken as the criterion of the stability of DC microgrid system.By using passive damping method, the load impedance characteristics are improved by increasing damping resistance, and the stability of DC microgrid is improved and the influence of filter parameters on the stability is obtained.The results show that the stability of DC microgrid in mode 2 is the worst, adding 12?After damping resistance, the amplitude margin increases by 12.7 dB and the phase angle margin increases by 11.5 掳.Therefore, passive damping can improve the load impedance characteristics and improve the stability of DC microgrid.
【作者单位】：西安理工大学自动化与信息工程学院;清华大学电力系统及发电设备安全控制和仿真国家重点实验室;
【基金】：国家自然科学基金项目(51307140;51277150) 陕西省工业攻关项目(2013K07-05) 陕西省教育厅产业化培育项目(14JF020) 电力系统国家重点实验室开放基金(SKLD16KZ01)~~
【分类号】：TM727

【相似文献】