基于特征子系统的电力电子主导电力系统频率和电压强度分析
Analysis of Frequency and Voltage Strength in Power Electronics-Dominated Power Systems Based on Eigen-subsystems
AI总结：
本文提出统一框架分析电力电子主导系统频率电压强度，通过特征子系统分解与模态解耦，引入CM/DM组件评估系统稳定性。
摘要：
逆变器基于资源（IBRs）的大规模集成已恶化了电力系统频率/电压（F/V）响应，导致不稳定性风险增加。因此，评估F/V强度已成为电力电子（PE）主导电力系统中的重要任务。现有方法通常分别考察F/V强度，采用根本不同的指标，如惯性（侧重于设备动态）和短路比（SCR，解决网络特性）。这些碎片化方法导致对整体系统强度的理解不足，可能忽视关键方面。为解决此问题，本文提出了一种统一的分析F/V强度的框架。首先，引入了统一的F/V调节建模。然后基于模态解耦，将电力系统分解为若干特征子系统，其中F/V响应被分解为共同模式（CM）和差分模式（DM）成分，即CM-F、DM-F、CM-V和DM-V。CM-F和CM-V代表所有设备对外部有功或无功扰动的集体响应，与电力网络特性无关。相反，DM-F和DM-V捕捉扰动功率在系统内的再分布，这强烈受网络拓扑和设备位置的影响。值得注意的是，传统强度分析通常忽略CM-V（全球电压响应），本文发现它也可能在PE主导的电力系统中变得不稳定。基于所提框架，提出了新的指标来评估每个模态成分的强度。最后，通过仿真验证了所提方法的有效性。
英文摘要：
The large-scale integration of inverter-based resources (IBRs) has deteriorated the frequency/voltage (F/V) responses of power systems, leading to a higher risk of instability. Consequently, evaluating the F/V strength has become an important task in power electronics (PE)-dominated power systems. Existing methods typically examine F/V strength separately, employing fundamentally different metrics, such as inertia (focusing on device dynamics) and short-circuit ratio (SCR, addressing network characteristics). These fragmented approaches have resulted in a lack of comprehensive understanding of the overall system strength, potentially overlooking critical aspects. To address this problem, this paper proposes a unified framework for analyzing F/V strength. First, a unified modeling of F/V regulations is introduced. Then, based on modal decoupling, the power systems are decomposed into several eigen-subsystems, where the F/V responses are both decomposed into common-mode (CM) and differential-mode (DM) components, namely, CM-F, DM-F, CM-V, and DM-V. The CM-F and CM-V represent the collective response of all devices to external active or reactive power disturbances, independent of the power network characteristics. In contrast, the DM-F and DM-V capture the redistribution of disturbance power within the system, which is strongly influenced by the network topology and the locations of devices. Notably, traditional strength analysis generally ignores the CM-V (global voltage response), which, as discovered in this paper, may also become unstable in PE-dominated power systems. Based on the proposed framework, new metrics are proposed to evaluate the strength of each modal component. Finally, the effectiveness of the proposed approach is validated through simulations.
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