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With the development of the Wide-Area Measurement System (WAMS), researchers has proposed different kinds of Wide-Area Damping Controller (WADC) to suppress inter-area power oscillations. However time delays in WAMS communication networks have made it less effective to improve dynamic stability of large-scale power system. Traditional methods such as modal analysis and simulation cannot study the...
Isolated grid (IG) usually has small inertia constant, and the primary frequency regulation ability of IG is limited. In addition, high penetration level of photovoltaic power plants (PV-PPS)integrated to IG deteriorate system inertial and primary frequency regulation ability. To ensure the stability of frequency, UC model considering dynamic frequency limit (DFL) is proposed in this paper, and PV-PPS...
With the advent of smart-grid technology, the wide application of FACTS (Flexible AC Transmission Systems)- based damping controllers exerts influences on both small signal stability and transient stability. Traditional Modal Analysis (MA) method can hardly meet the requirements of online applications. According to the inter-area oscillation mode to be studied, the multi-machine system can be equivalent...
To assist dispatchers to on-line monitor small signal stability of power grid, this paper proposed an artificial intelligent method-Case-Based Reasoning(CBR) theory to predict small signal stability based on measurement data of wide area measurement system (WAMS). Oscillatory active power increment distribution (OAPID) was introduced to improve the prediction accuracy. The designing process of small...
The behavior of credibility theory is analyzed to account for uncertainties on the small signal stability problem of microgrid. Uncertainties such as random fluctuation of power generations and loads in a MG should be taken into consideration for effective analysis of small signal stability of the MG. Based on credibility theory. This paper presents a novel small signal stability fuzzy analysis method...
This paper proposes a power system small signal (dynamic) stability early warning approach based on Case-Based Reasoning (CBR) theory, which is an artificial intelligent method. According to measurement data of Wide Area Measurement System (WAMS), this approach is able to achieve following functions: In normal operation status, it can estimate small signal stability of power grid via CBR in historical...
This paper presents a two-point estimate (TPE) based method for probabilistic analysis of small signal stability of a microgrid (MG) considering uncertainties. The uncertainties may arise from different sources as load demand or generation unit outages. This method combines the TPE method and probabilistic small signal stability analysis. Stability indices and the judgment of unstable types for microgrid's...
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