Frequency support from modular multilevel converter based multi-terminal HVDC schemes
Frequency support from modular multilevel converter based multi-terminal HVDC schemes
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DOI：
10.1109/pesgm.2015.7286086
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
O. Adeuyi;M. Cheah‐Mane;Jun Liang;N. Jenkins;Yanan Wu;Chang Li;Xueguang Wu
中科院分区：
文献类型：
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作者：
O. Adeuyi;M. Cheah‐Mane;Jun Liang;N. Jenkins;Yanan Wu;Chang Li;Xueguang Wu
多端高压直流输电(MTDC)方案旨在将电力从海上风电场输送到陆地，并通过电压源换流器(VSC)将邻近国家的电网互联。VSCS的模块化多电平变流器(MMC)拓扑是近年来发展起来的一种低谐波、低损耗、占用空间小的拓扑结构。本文分析了基于MMC的多端高压直流输电系统的频率支持特性，利用MMC的电容、风力机旋转质量和其他交流系统传递的能量。为了确定MTDC格式传递的能量，提出了一种等效合成惯性常数的通用公式。利用一个三端MMCHVDC系统研究了子模块的单元电容和MTDC系统的合成惯性常数对MMC电容器频率支持能力的影响。比较了MTDC系统中不同能源的时间响应和能量性能。
Multiterminal HVDC (MTDC) schemes are intended to transfer power from offshore wind farms to land and interconnect the grids of adjacent countries, through Voltage Source Converters (VSC). The modular multilevel converter (MMC) topology of VSCs is a more recent development which has low harmonics, reduced losses and occupies less space. This paper analyses the frequency support characteristics of MMC-based multiterminal HVDC schemes, using the energy transferred from the capacitance of the MMCs, wind turbine rotating mass and other AC systems. A generic formulation of an equivalent synthetic inertia constant is proposed to determine the energy transferred from the MTDC scheme. A 3-terminal MMCHVDC system is utilised to study the influence of cell capacitance of the submodules and the proposed synthetic inertia constant of the MTDC system on the frequency support capability of the MMC capacitors. The time response and energy capability of the different energy sources of the MTDC system are compared.