Stability analysis of power systems described with detailed models by automatic method |
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| Authors: | L.D. Colvara |
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| Affiliation: | 1. College of Water Conservancy, Key Laboratory of Soil Erosion Control and Ecological Restoration in Liaoning Province, Shenyang Agricultural University, Shenyang 110866, China;2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest Agriculture and Forestry University, Yangling 712100, China;3. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;1. Department of Structural Engineering, Tongji University, NO. 1239 Siping Road, Shanghai 200092, China;2. Tongji Architectural Design (Group) Co., Ltd., NO. 1230 Siping Road, Shanghai 200092, China;3. Department of Civil Engineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan;4. East China Architectural Design & Research Institute Co. Ltd., NO. 151 Hankou Road, Shanghai 200092, China;2. AGRAVIS Futtermittel GmbH (Animal Feed Company), Industrieweg 110, 48155 Münster, Germany |
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| Abstract: | The power system stability analysis is approached taking into explicit account the dynamic performance of generators internal voltages and control devices. The proposed method is not a direct method in the usual sense since conclusion for stability or instability is not exclusively based on energy function considerations but it is automatic since the conclusion is achieved without an analyst intervention. The stability test accounts for the nonconservative nature of the system with control devices such as the automatic voltage regulator (AVR) and automatic generation control (AGC) in contrast with the well-known direct methods. An energy function is derived for the system with machines forth-order model, AVR and AGC and it is used to start the analysis procedure and to point out criticalities. The conclusive analysis itself is made by means of a method based on the definition of a region surrounding the equilibrium point where the system net torque is equilibrium restorative. This region is named positive synchronization region (PSR). Since the definition of the PSR boundaries have no dependence on modelling approximation, the PSR test conduces to reliable results. |
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