A Novel Optimization Based Control Determination against Voltage Collapse with respect to System wide Disturbances as well as Undesirable Component Protection

针对系统范围干扰以及不良组件保护的电压崩溃的新颖的基于优化的控制确定

• 批准号: 0500884
• 负责人: Venkataramana Ajjarapu
• 金额: $ 15.45万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-15 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0500884&HistoricalAwards=false
• 关键词: Novel; Optimization; Based; Control; Determination

The security of a bulk power system is threatened when it is loaded near to its maximum capacity. Voltage instability and undesirable protective relay operation are two major interrelated phenomena that can occur when the system is under stress. As reported in many voltage collapse incidents, when the system is subjected to a major disturbance, high loading conditions on system components tend to operate protective relays. The operation of these relays further trips the critical components, leading to cascading events of tripping. The lack of reactive power during heavy loading conditions may trigger field limiters and overload protection to trip the generators. Undoubtedly, this directly contributes to wide-area blackouts. There is a need for countermeasures that take into account both system wide disturbances as well as undesirable protective operation. The amount of corrective control needed to save the system from voltage collapse depends on the timing of the control. The amount of required control increases dramatically if the timing of the control is beyond the critical time. A cost effective control strategy is need to determine when, where and how much control is needed to avoid system wide collapse. The proposal directly addresses these issues in a comprehensive and coordinated way. The framework includes a novel decoupled manifold-based time-domain simulation algorithm to identifying system collapse. A novel optimization-based control determination algorithm then provides the location, the quantity, and the timing of control to avoid system collapse.

当大容量电力系统的负载接近其最大容量时，其安全就会受到威胁。电压不稳定和不良的保护继电器操作是系统承受压力时可能发生的两个主要相互关联的现象。正如许多电压崩溃事件中所报告的那样，当系统受到重大干扰时，系统组件的高负载条件往往会使保护继电器动作。这些继电器的运行会进一步使关键组件跳闸，从而导致级联跳闸事件。重负载条件下无功功率的缺乏可能会触发励磁限制器和过载保护以使发电机跳闸。毫无疑问，这直接导致了大面积停电。 需要采取既考虑系统范围干扰又考虑不良保护操作的对策。避免系统电压崩溃所需的校正控制量取决于控制的时序。如果控制时间超出了关键时间，则所需的控制量会急剧增加。需要一种具有成本效益的控制策略来确定何时、何地以及需要多少控制以避免系统范围的崩溃。该提案以全面、协调的方式直接解决了这些问题。 该框架包括一种新颖的基于解耦流形的时域模拟算法来识别系统崩溃。然后，一种新颖的基于优化的控制确定算法提供控制的位置、数量和时间，以避免系统崩溃。