暂态稳定极限耦合的多个输电断面极限功率协调计算

为了进行多断面稳定输送水平交互影响的量化评估,实现多断面输电功率同时达到极限值的自动搜索计算,提出了暂态稳定极限存在耦合的多个输电断面极限功率协调计算方法。分析了不同输电断面暂态稳定极限耦合的机理,建立了以各断面主导的系统稳定性同时达到临界稳定为目标的多断面输电极限协调计算数学模型,提出了多断面输电功率同时变化对系统稳定裕度影响的量化分析方法,设计了基于数学规划求解多断面功率增长步长的极限功率迭代搜索算法,可用于多个输电断面极限功率的离线或在线分析计算和实时监控。基于IEEE 10机39节点系统的算例验证了算法的正确性和有效性。

Coordinated Limit Power Calculation of Multi-sections with Transient Stability Limit Coupling

In order to quantitatively assess the interaction between transmission levels and implement automatic calculation of limit power of multi-sections simultaneously, a coordinated limit power calculating method of multi-sections coupled with transient stability limit is proposed. The coupling mechanism is analyzed first, and a coordinated model for the dominant limit power of multi-sections to reach critical stability at the same time is developed. Then a quantitative method for analyzing the influence of simultaneous variation of multi-section transmission power on stability margin is proposed. An iterative algorithm based on the mathematical programming method for solving power increase step size is designed, which can be used for offline or online analysis and real-time monitoring of transmission limit power of multi-sections. The validity of this method is verified by an example of an IEEE 10-unit 39-bus system. This work is supported by State Grid Corporation of China, Major Projects on Planning and Operation Control of Large Scale Grid (No. SGCC-MPLG003-2012), State Grid Corporation of China and National Invention Patent (No. ZL201010195005.6).