Voltage security assessment of power system is an important and all-inclusive aspect of power system operation and preventive control actions. Fast and accurate detection of critical components of the power system is ...Voltage security assessment of power system is an important and all-inclusive aspect of power system operation and preventive control actions. Fast and accurate detection of critical components of the power system is one essential approach for preventing the occurrence of voltage collapse phenomenon. Over the years, several approaches for voltage collapse point identification and prevention have been widely studied using the continuous power flow approach, minimum singular value of eigenvalues, Jacobian matrices, and power transfer concept. In this work, critical node (bus) identification based on power system network structure is proposed. In this approach, the power system is treated as a multidimensional graph with several nodes (buses) linked together by the transmission lines. An improved line voltage stability margin estimator which is based on active and reactive power changes in a power system is used as the weight of each transmission line and an adaptation of the degree of centrality approach is used to determine the criticality of the system buses. A comparative analysis with other bus voltage stability indices is presented to test the suitability of the proposed approach using the IEEE 14, 30, 57 and 118 bus test systems.展开更多
Renewable energy is becoming more popular due to its benefits for both economic and environmental reasons.Therefore,having a fault free system will enhance efficiency and proper delivery of power.This paper presents t...Renewable energy is becoming more popular due to its benefits for both economic and environmental reasons.Therefore,having a fault free system will enhance efficiency and proper delivery of power.This paper presents the design,modelling and simulation of a Synchronverter,analyzing its fault and response of the system during integration.A synchronous frequency regulator for grid connection is proposed to improve quick recovery,power quality enhancement and good system performance after a fault occurrence.The swing equation provides the inertia and the damping for stability,swift system integration of photovoltaic energy to the grid and an overall effective performance.The effectiveness of the proposed model was simulated in MATLAB/Simulink to analyze the system’s response during and after a fault occurrence and photovoltaic integration comparing load change at different times.Simulation results and analysis are presented to validate proposed controller.展开更多
文摘Voltage security assessment of power system is an important and all-inclusive aspect of power system operation and preventive control actions. Fast and accurate detection of critical components of the power system is one essential approach for preventing the occurrence of voltage collapse phenomenon. Over the years, several approaches for voltage collapse point identification and prevention have been widely studied using the continuous power flow approach, minimum singular value of eigenvalues, Jacobian matrices, and power transfer concept. In this work, critical node (bus) identification based on power system network structure is proposed. In this approach, the power system is treated as a multidimensional graph with several nodes (buses) linked together by the transmission lines. An improved line voltage stability margin estimator which is based on active and reactive power changes in a power system is used as the weight of each transmission line and an adaptation of the degree of centrality approach is used to determine the criticality of the system buses. A comparative analysis with other bus voltage stability indices is presented to test the suitability of the proposed approach using the IEEE 14, 30, 57 and 118 bus test systems.
文摘Renewable energy is becoming more popular due to its benefits for both economic and environmental reasons.Therefore,having a fault free system will enhance efficiency and proper delivery of power.This paper presents the design,modelling and simulation of a Synchronverter,analyzing its fault and response of the system during integration.A synchronous frequency regulator for grid connection is proposed to improve quick recovery,power quality enhancement and good system performance after a fault occurrence.The swing equation provides the inertia and the damping for stability,swift system integration of photovoltaic energy to the grid and an overall effective performance.The effectiveness of the proposed model was simulated in MATLAB/Simulink to analyze the system’s response during and after a fault occurrence and photovoltaic integration comparing load change at different times.Simulation results and analysis are presented to validate proposed controller.
