Wave Function and Multiscale Modeling of MMC-HVdc System for Wide-Frequency Transient Simulation
Wave Function and Multiscale Modeling of MMC-HVdc System for Wide-Frequency Transient Simulation
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DOI：
10.1109/jestpe.2021.3051647
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发表时间：
2021-10
影响因子：
5.5
通讯作者：
Hua Ye;Feng Gao;W. Pei;L. Kong
中科院分区：
文献类型：
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作者：
Hua Ye;Feng Gao;W. Pei;L. Kong
电力电子器件的详细建模给以电力电子器件为主的大规模电力系统的有效暂态仿真带来了挑战。作为PE范型，开发、实现和验证了模块化多电平换流器(MMC)的多尺度建模方法，以仿真MMC高压直流输电系统中从低频振荡到高频开关事件的各种暂态过程。其创新之处在于建立了一个描述MMC子模块(SM)暂态行为的波传播函数(WPF)，并在此基础上提出了基于SM傅立叶级数的移频相量(SFP)，以加快系统级动力学的计算速度。这些工作作为实现多频移的MMC的多尺度建模的基础。通过实现与控制系统的无缝模型接口，多尺度建模适用于MMC-HVDC输电系统。通过涵盖直流故障、MMC内部故障、电力振荡和风电波动的案例研究，验证了该多尺度模型。通过与全电磁暂态(EMT)模型计算结果的比较，验证了该模型的计算精度和效率。
The detailed modeling of power electronic (PE) devices poses challenging problems to an efficient transient simulation of large-scale PE-dominated power systems. As PE paradigm, a multiscale modeling methodology of the modular multilevel converter (MMC) for simulating diverse transients from low-frequency oscillations up to high-frequency switching events in an MMC high-voltage direct current (HVdc) system is developed, implemented, and validated. The novelty lies in the creation of a wave propagation function (WPF) that describes the MMC submodule (SM) transient behavior, and then, the SM Fourier series-based shifted-frequency phasor (SFP) is developed to accelerate the computation speed of the system-level dynamics. These efforts serve as the basis for multiscale modeling of the MMC where a multiple-frequency shifting is achieved. By implementing a seamless model interface with the control systems, the multiscale modeling is applicable to an MMC-HVdc transmission system. The multiscale model is validated through case studies that cover dc fault, MMC internal fault, power oscillations, and wind power fluctuations. The computational accuracy and efficiency of the model are verified through a comparison of the results with those from the full electromagnetic transient (EMT) model.