| 直流微网谐振模态分析及有源阻尼抑制方法 |
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| 引用本文： | 林刚,李勇,王姿雅,曹一家,刘嘉彦,王鹏程,樊芮,杨倩雅.直流微网谐振模态分析及有源阻尼抑制方法[J].电力自动化设备,2019,39(4). |
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| 作者姓名： | 林刚 李勇 王姿雅 曹一家 刘嘉彦 王鹏程 樊芮 杨倩雅 |
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| 作者单位： | 湖南大学电气与信息工程学院,湖南长沙,410082;国网湖南省电力有限公司供电服务中心(计量中心),湖南长沙410004;智能电气测量与应用技术湖南省重点实验室,湖南长沙410004;国网湖南省电力有限公司检修公司,湖南长沙,410000 |
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| 基金项目： | 国家自然科学基金资助项目(51822702)；湖南省重点研发计划项目(2018GK2031)；长沙市杰出青年创新项目(KQ1707003) |
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| 摘 要： | 谐振可能引起直流微网的谐波不稳定,是导致电压崩溃的潜在原因。利用频域分析法确定直流微网的谐振频率需要建立复杂的高阶传递函数,且不能提供谐振影响范围等信息。提出了分布式控制下直流微网的谐振模态分析方法,通过分析系统的节点导纳矩阵确定系统的谐振频率,并利用频域分析验证该方法的有效性;根据参与因子确定谐振的影响范围,进一步地研究了线路参数对系统模式和谐振频率的影响;提出了有源阻尼抑制方法,通过在电流内环注入阻尼信号降低线路调节变流器(LRC)输出阻抗的谐振峰值,提高系统的稳定性;基于PSCAD/EMTDC平台对所提分析方法和有源阻尼控制进行仿真验证。
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| 关 键 词： | 直流微网 模态分析 谐振 有源阻尼 线路调节变流器 |
| 收稿时间： | 2018/5/19 0:00:00 |
| 修稿时间： | 2019/1/25 0:00:00 |
Resonance modal analysis and active damping suppression method for DC microgrid |
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| LIN Gang,LI Yong,WANG Ziy,CAO Yiji,LIU Jiayan,WANG Pengcheng,FAN Rui and YANG Qianya.Resonance modal analysis and active damping suppression method for DC microgrid[J].Electric Power Automation Equipment,2019,39(4). |
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| Authors: | LIN Gang LI Yong WANG Ziy CAO Yiji LIU Jiayan WANG Pengcheng FAN Rui and YANG Qianya |
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| Affiliation: | School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,School of Electrical and Information Engineering, Hunan University, Changsha 410082, China,State Grid Hunan Electric Power Co.,Ltd. Power Supply Service Center(Metrology Center),Changsha 410004, China; Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology, Changsha 410004, China and State Grid Hunan Electric Power Maintenance Company, Changsha 410000, China |
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| Abstract: | Resonance could cause harmonic instability in DC microgrid, and represents a potential cause of voltage collapse. To determine the resonance frequency of DC microgrid, the traditional frequency domain analysis requires the establishment of complicated high-order transfer function and cannot provide the information such as influence range of resonance. A resonance modal analysis method of DC microgrid under distributed control is proposed, and the resonance frequency of the system is obtained by analyzing its node admittance matrix. The effectiveness of the method is verified using the frequency domain analysis. The influence range of the resonance can be determined according to the participation factors. Besides, the influence of line parameters on system mode and resonance frequency is analyzed. Furthermore, an active damping controller is proposed, which reduces the resonance peak value of LRC(Line Regulating Converter) output impedance by injecting damping signal into the inner current loop, and improves the stability of system. Finally, the proposed method and the active damping control are verified by simulative results on PSCAD/EMTDC. |
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| Keywords: | DC microgrid modal analysis resonance active damping line regulating converter |
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