ANÁLISE DE ESTABILIDADE DE TENSÃO EM CASOS DE CONTINGÊNCIAS DUPLAS DE LINHAS DE TRANSMISSÃO COM COMPENSAÇÃO PARALELA
ANÁLISE DE ESTABILIDADE DE TENSÃO EM CASOS DE CONTINGÊNCIAS DUPLAS DE LINHAS DE TRANSMISSÃO COM COMPENSAÇÃO PARALELA
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DOI: https://doi.org/10.22533/at.ed.654112526028
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Palavras-chave: Fluxo de Potência. Energia Elétrica. Contingências Múltiplas. Estabilidade de Tensão.
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Keywords: Power flow, Electric power, Multiple contingencies, Voltage stability.
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Abstract: The Brazilian power system and its transmission networks have expanded significantly in size and complexity, leading to heightened challenges related to failures—such as energy supply interruptions caused by external events—and instabilities characterised by abrupt variations in electrical parameters (e.g., voltage and frequency). These phenomena adversely affect both power transmition and system reliability. This study analyses double contingencies in transmission lines under the N-2 criterion and their effects on the stability of a 33-bus test system, defined as the ability to maintain operational equilibrium after events such as weather-induced failures in network components. Three distinct scenarios were examined: base case, post-contingency, and post-parallel compensation. Parallel compensation was implemented in the final stage as a method to improve the operational profile of system buses after contingencies, ensuring electrical parameters remained within limits established by Brazil’s National Electric System Operator (ONS). The double contingencies were simulated using the ANAREDE software, with power flow solved via the Newton-Raphson method. Of 2,465 simulated cases, 1,104 achieved convergence. Two cases were selected based on the severity of voltage drops observed at system buses, compared to ONS emergency operating limits. The FLUPOT software determined the reactive power required to correct voltages at critical buses (those exceeding the ONS emergency range of 0.90 to 1.05 pu). Compensation was individually tailored for each case. Post-compensation, voltage levels at critical buses were restored to acceptable limits. PV curve analysis across the three scenarios (pre-contingency, N-2 post- contingency, and post-compensation) revealed significant voltage reductions, particularly at buses 965, 964, 976, and 1210. Initially, both cases exhibited voltage stability and loadability margins below 4% (the minimum recommended threshold). However, parallel reactive compensation increased these margins to ONS-approved levels, ensuring secure and reliable system operation..
- Heloisa Piano Ghellere
- Cristiane Lionço de Oliveira
- Evandro Andre Konopatzki
- Filipe Marangoni