Impact of DC Breaker Systems on Multiterminal VSC-HVDC Stability
Impact of DC Breaker Systems on Multiterminal VSC-HVDC Stability
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DOI：
10.1109/tpwrd.2015.2409132
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发表时间：
2016-04
影响因子：
4.4
通讯作者：
Wenyuan Wang;M. Barnes;O. Marjanovic;O. Cwikowski
中科院分区：
文献类型：
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作者：
Wenyuan Wang;M. Barnes;O. Marjanovic;O. Cwikowski
将VSC-HVDC电网用于海上风电场集成将需要使用直流断路器系统，目前它们需要直流电抗器来限制故障电流的上升速率。在整个VSC-HVDC系统中引入大型直流电抗器可能对其稳定运行产生重大影响，并需要额外的控制。本文分析了这个问题，并提出了一个类似PSS的控制（DCPSS），以帮助直流电网的稳定性和科普这种影响。本文提出了一种用于直流电压控制研究的广义解析模型。通过分析开环和闭环模型的极点、零点和频率响应，研究了在多端系统中使用直流电抗器引起的关键稳定性和瞬态性能问题。给出了DCPSS的设计和位置识别方法。该控制器实现了良好的阻尼增强效果。本文基于两种VSC-HVDC模型进行了分析研究和时域仿真。
The use of VSC-HVDC grids for offshore wind farm integration will require the use of dc breaker systems and presently they require dc reactors to limit the rate of rise of fault current. The introduction of large dc reactors throughout a VSC-HVDC system can have a significant impact on its stable operation and will require additional control. This paper analyzes this problem and proposes a PSS-like control (DCPSS) to aid dc grid stability and cope with this effect. A generalized analytical model for studies on dc voltage control is presented. Key stability and transient performance issues caused by the use of the dc reactors in a multiterminal system are investigated by analyzing poles, zeros, and frequency responses of open-loop and closed-loop models. Design and location identification methods for the DCPSS are provided. An excellent damping enhancement is achieved by this controller. The analytical studies and time-domain simulations in this paper are performed based on two VSC-HVDC models.