Research on Synchronous Condensers to Suppress Subsynchronous Oscillation Caused by New Energy Power Generation
Research on Synchronous Condensers to Suppress Subsynchronous Oscillation Caused by New Energy Power Generation
复制标题
同步调相机抑制新能源发电次同步振荡的研究
DOI：
10.1109/acpee51499.2021.9436939
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
L. Shen
中科院分区：
文献类型：
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作者：
N. Du;Peipeng Zhou;Daye Yang;L. Shen
研究和实践表明，风电、光伏等新能源发电可能引起次同步振荡。2015年7月，中国新疆珠穆朗玛峰发生了一次典型的风电场事故，导致多达3台汽轮机连续跳闸，± 800 kV珠穆朗玛-郑州直流输电系统不得不遭受大功率骤降。与串补汽轮机或高压直流系统的类似现象不同，NEPG引起的振荡频率不是一个常数，而是一个宽带可变值。这种特性使得难以有效和经济地抑制。目前，我国高压直流整流站普遍采用同步调相机（SC）提供无功和电压支持，新能源发电厂也越来越多地采用分布式同步调相机来提高电网的电压安全稳定性。本文提出了一种新的抑制NEPG引起的次同步振荡的方法，即在NEPG基地和HVDC整流站已采用的同步电容器的励磁系统中增加一个次同步振荡阻尼控制回路。通过仿真实验初步验证了抑制效果。
Studies and practices indicate that new energy power generation (NEPG) such as wind and photovoltaic power may cause subsynchronous oscillation (SSO). A typical event caused by wind farms occurred in Qomul, Xinjiang, China, in July 2015, which led up to three steam turbines tripped off the grid in succession, and the ±800kV Qomul-Zhengzhou HVDC had to suffer a large power plummet. Different from similar phenomena relevant to steam turbines with series compensation or HVDC, the oscillation frequency due to NEPG is not a constant, but a variable value in a broadband. This characteristic makes it difficult to be effectively and economically suppressed. Nowadays in China, bursting synchronous condensers (SC) are more common to be installed in HVDC rectifier stations to provide reactive power and voltage support, and distributed synchronous condensers are employed more widely in new energy plants to improve voltage safety and stability of the grid. This paper proposes a new suppression method for SSO caused by NEPG, that is to append a subsynchronous oscillation damping control loop to the excitation system of the synchronous condensers, which are already employed in NEPG bases and HVDC rectifier stations. Simulation work has been carried out to verify the suppression effect preliminarily.