Mitigation of Power System Oscillations

在电力系统中，由于诸如发电的突然变化、大负荷的突然增加或减少、输电线路停止服务以及系统故障等干扰而发生振荡。在过去，如果不能在可接受的时间内消除这些振荡，就会导致大停电，并损坏电力系统中的昂贵设备。振荡的存在也限制了电力公司之间输出或输入的能源量，导致收入损失。振荡可以有不同的类型。最常见的是机电振荡，它涉及大型旋转机器在输电网络中相互振荡。这些振荡是0-5赫兹范围内的低频振荡。另一种类型被称为次同步振荡，其频率可以达到标称系统频率（50或60赫兹）。这些振荡在过去不太常见，但由于通过电力电子接口集成可再生能源，它们变得越来越普遍。目前还没有程序或工具可以直接设计振荡缓解控制器，以满足现代电网。我将使用状态空间控制设计技术和优化技术来提出经过良好测试的新程序，以使公用事业、制造商和顾问能够开发可靠且具有成本效益的解决方案。在该项目下培训的hqp将获得电力系统仿真技术和工具方面的专业知识。他们还将通过与行业合作，将新技术应用于实际情况。

Oscillations occur in power systems due to disturbances such as sudden changes in generation, the sudden addition or removal of large loads, transmission lines going out of service, and faults in the system. These oscillations, when not eliminated within an acceptable time, have led to major blackouts in the past, and damaging expensive equipment in the power systems. The presence of oscillations also restricts the amount of energy exported or imported between power utilities, resulting in loss of revenue. Oscillations can be of different types. The most common is electromechanical oscillations, which involves large rotating machines oscillating against each other across the transmission network. These oscillations are of low frequency in the range of 0-5 Hz. The other type is known as sub synchronous oscillations of which the frequency can be up to the nominal system frequency (50 or 60 Hz). These oscillations have been less common in the past, but due to the integration of renewable sources through power electronic interfaces they are becoming more common. Currently there is no procedure or tools available to directly design oscillation mitigating controllers to cater for the modern power grid. I will use state space control design techniques and optimization techniques to propose well tested new procedures to enable the utilities, manufacturers, and consultants to develop reliable and cost effective solutions. The HQPs trained under this program will gain expertise in power system simulation techniques and tools. They will also apply the new techniques to practical situations through collaborations with the industry.