电力系统稳态稳定在线监测的模态空间法
A Modal-Space Method for Online Power System Steady-State Stability Monitoring
摘要：
提出了一种利用模态空间中的非线性电力系统动态模型估计稳态功角稳定极限的新方法。通过两次线性坐标变换和稳态条件的简化，将非线性电力系统动态模型转化为若干个单机型电力系统，并可导出其功角曲线，用于估计SSASL。所提出的方法估计SSASL的角度在所有机器和所有总线，而不需要手动指定的情况下，即设置汇和源区域，也不需要解决多个非线性潮流。对9节点和39节点电力系统的算例分析表明，该方法能够在线捕捉非周期失稳，与传统的基于潮流的分析方法相比，具有良好的稳态功角稳定性在线监测性能。
英文摘要：
This paper proposes a novel approach to estimate the steady-state angle stability limit (SSASL) by using the nonlinear power system dynamic model in the modal space. Through two linear changes of coordinates and a simplification introduced by the steady-state condition, the nonlinear power system dynamic model is transformed into a number of single-machine-like power systems whose power-angle curves can be derived and used for estimating the SSASL. The proposed approach estimates the SSASL of angles at all machines and all buses without the need for manually specifying the scenario, i.e. setting sink and source areas, and also without the need for solving multiple nonlinear power flows. Case studies on 9-bus and 39-bus power systems demonstrate that the proposed approach is always able to capture the aperiodic instability in an online environment, showing promising performance in the online monitoring of the steady-state angle stability over the traditional power flow-based analysis.
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