| 引用本文: | 陈昕,张昌华,黄琦,杨文龙,陈树恒,刘群英.与SG具有一致响应的VSG小信号建模和分析[J].电力自动化设备,2017,37(11): |
| CHEN Xin,ZHANG Changhua,HUANG Qi,YANG Wenlong,CHEN Shuheng,LIU Qunying.Small signal modeling for virtual synchronous generator consistent with synchronous generator and analysis[J].Electric Power Automation Equipment,2017,37(11): |
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| 摘要: |
| 提出一种新型的虚拟同步发电机(VSG)设计方法，构建虚拟的励磁控制器、调速器和电磁暂态模拟单元。分别对机端电压的d、q分量引入PI控制器，以达到VSG与同步发电机(SG)具有一致响应的目的。建立VSG单机无穷大系统小信号模型，求取并分析系统特征根及其参与因子。分析惯性时间常数、励磁参数对 VSG小信号稳定性的影响规律，发现其与SG相关理论吻合。同时分析PI控制参数、线路参数对系统小信号稳定性的影响。利用MATLAB/Simulink仿真验证了上述方法的正确性。 |
| 关键词: 虚拟同步发电机 一致性 小信号稳定性 逆变器 特征根 参与因子 |
| DOI：10.16081/j.issn.1006-6047.2017.11.013 |
| 分类号:TM34;TM712 |
| 基金项目:留学回国人员科研启动基金资助项目；中央高校基本科研业务费资助项目(ZYGX2015J104)；国家自然科学基金资助项目(51677020) |
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| Small signal modeling for virtual synchronous generator consistent with synchronous generator and analysis |
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CHEN Xin, ZHANG Changhua, HUANG Qi, YANG Wenlong, CHEN Shuheng, LIU Qunying
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School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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| Abstract: |
| An improved VSG(Virtual Synchronous Generator) model is presented through modeling of virtual exciter, governor, and electromagnetic transient simulation unit. A PI internal-loop controller is designed for inverter terminal voltage d-and q-axis elements, which ensures that the proposed improved VSG can provide an equivalent dynamic response as SG(Synchronous Generator). A small-signal model of a single VSG machine infinite-bus system is developed, and then the system eigenvalues and participation factors are calculated. Effects of the inertia time constants and the excitation system parameters on VSG small-signal stability are analyzed. The analyzed conclusion coincides with the correlative theories of SG. Influences of the PI controller parameters and the line parameters on VSG small-signal stability are also analyzed. Simulative results based on MATLAB/Simulink verify the effectiveness of the proposed method. |
| Key words: virtual synchronous generator consistency small-signal stability electric inverters eigenvalue participation factor |
