The impact of time delay on robust control design in power systems
The impact of time delay on robust control design in power systems
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DOI：
10.1109/pesw.2002.985276
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发表时间：
2002-08
期刊：
影响因子：
--
通讯作者：
Hongxia Wu;H. Ni;G. T. Heydt
中科院分区：
文献类型：
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作者：
Hongxia Wu;H. Ni;G. T. Heydt
为了提高大型电力系统的动态性能，提出了一种利用系统级数据的集中式广域控制器设计。该控制器的数据通信存在时间延迟。长时间的延迟会损害广域控制系统的稳定性，并且延迟会降低系统的鲁棒性。分析了电力系统中时滞对鲁棒广域控制器设计的影响。时间延迟描述使用Pade近似，并在鲁棒广域控制系统内进行模拟。通过大量的仿真研究发现，时滞的存在会使有功功率变化的超调量增大，调节时间延长。当时滞超过一定值时，闭环控制系统可能变得不稳定。鲁棒控制器可以重新设计，以适应可能的长时间延迟。针对一个两区域四机系统，研究了时滞对鲁棒控制器设计的影响。
A centralized wide area controller design using systemwide data is proposed to enhance the dynamic performance of a large power system. The time delay exists in the data communication for this controller. Long time delay may be a detriment to wide area control system stability and delay may degrade system robustness. This paper analyzes the impact of time delay on robust wide area controller design in power systems. Time delay is described using the Pade approximation and is simulated within the robust wide area control system. According to numerous simulations, it is found that the overshoot value of active power variation increases and the settling time is lengthened when time delay occurs. The closed-loop control system may become unstable when the time delay is over a certain value. A robust controller can be redesigned to accommodate the possible long time delay. The impact of time delay on robust controller design is studied using a two-area four-machine system.