| 采用VSG策略的MMC阻抗建模及并网稳定性分析 |
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| 引用本文： | 孙杰,尹太元,王跃,刘普,王晓雷,乐波.采用VSG策略的MMC阻抗建模及并网稳定性分析[J].电源学报,2021,19(6):30-41. |
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| 作者姓名： | 孙杰 尹太元 王跃 刘普 王晓雷 乐波 |
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| 作者单位： | 西安交通大学电气工程学院,西安交通大学电气工程学院,西安交通大学电气工程学院,郑州轻工业大学电气与信息工程学院,中原工学院电子信息学院,国网经济技术研究院有限公司 |
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| 基金项目： | 国家电网公司科技项目(基金编号5100-202056393A-0-0-00) |
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| 摘 要： | 随着分布式能源并网的增多，局部电网逐渐呈现出弱电网特性，虚拟同步发电机（VSG）控制由于可以模拟同步发电机的特性，能够为弱电网提供惯性和阻尼支撑。本文采用谐波线性化方法对采用VSG控制策略的模块化多电平换流器(MMC)进行阻抗建模。所得到的阻抗模型在低频段主要呈容性，在高频段主要呈感性，在复杂电力系统中，可能会与电网阻抗存在谐振点。分析了VSG主要控制参数对MMC阻抗的影响，发现有功-频率下垂系数、阻尼系数和虚拟转动惯量主要影响50Hz附近的阻抗。根据阻抗稳定性判据对MMC并网系统进行稳定性分析，发现并网系统在高频段有振荡的风险。
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| 关 键 词： | 虚拟同步发电机 模块化多电平换流器 谐波线性化 阻抗建模 稳定性分析 |
| 收稿时间： | 2021/6/29 0:00:00 |
| 修稿时间： | 2021/11/3 0:00:00 |
Impedance Modeling and Grid-connected Stability Analysis of MMC under VSG Control Strategy |
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| SUN Jie,YIN Taiyuan,WANG Yue,LIU Pu,WANG Xiaolei,YUE Bo.Impedance Modeling and Grid-connected Stability Analysis of MMC under VSG Control Strategy[J].Journal of power supply,2021,19(6):30-41. |
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| Authors: | SUN Jie YIN Taiyuan WANG Yue LIU Pu WANG Xiaolei YUE Bo |
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| Affiliation: | School of Electrical Engineering, Xi''an Jiaotong University, Xi''an 710049, China;College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450000, China;School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China |
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| Abstract: | With the increase of distributed energy connected to the grid, part of the grid presents weak grid characteristics. Virtual synchronous generator (VSG) control can provide inertia and damping support for weak grids. In this paper, harmonic linearization method is used to model the impedance of modular multi-level converter (MMC) with VSG control strategy. The impedance model obtained is mainly capacitive in low frequency and inductive in high frequency, which may bring resonance points with the grid impedance in complex power system. The influence of the main control parameters of VSG on the impedance of MMC is analyzed. It is found that the active power-frequency droop coefficient, damping coefficient and virtual moment of inertia mainly affect the impedance near 50Hz. According to the impedance stability criterion, the MMC grid-connected system has the risk of oscillation in high frequency band. |
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| Keywords: | virtual synchronous generator modular multilevel converter harmonic linearization impedance modeling stability analysis |
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