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Radmanesh, H.
- Studying Voltage Stability in Power System Considering Load Dynamics
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Authors
Affiliations
1 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
2 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
1 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
2 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
Source
Indian Journal of Science and Technology, Vol 6, No 11 (2013), Pagination: 5487–5494Abstract
This paper investigates on-load tap changer OLTC effect on voltage stability. Chaos theory used in this analysis is via the calculation of the maximum power transmission. Resulted chaotic behavior is exhibited by singular induced bifurcation which clearly shows the voltage stability of the power system with OLTC from a singular induced bifurcation point of view. The paper is organized as follows: 1) increasing in the maximum reactive power via increasing the ratio of OLTC and the possibility of voltage collapse decrease under the same load command. 2) Noting that the voltage instability is directly affected by the load characteristics, shown via the effect of OLTC on the voltage instability under different static load models. 3) Studying voltage stability in state space and the effects of the generator excitation current limit, the OLTC and load dynamics on voltage collapse. In addition, a small-disturbance voltage stability region of a power system is constructed. The voltage stability of the system is determined by the dynamic characteristics of both the OLTC and the load.Keywords
On Load Tap Changer, Voltage Stability, State Space, Bifurcation DiagramFull Text
References
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- An overview of High Frequency Switching Patterns of Cascaded Multilevel Inverters Suitable for Pv Applications and Proposing a Modified Method
Abstract Views :292 |
PDF Views:0
Authors
Affiliations
1 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
2 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
1 Electrical Engineering Department, Amirkabir University of Technology, Tehran, IR
2 Department of Electrical Engineering, Islamic Azad University, Takestan Branch, Takestan, IR
Source
Indian Journal of Science and Technology, Vol 7, No 9 (2014), Pagination: 1342–1349Abstract
In this paper different high frequency switching methods for multilevel inverters which has been proposed for PV applications is analyzed; furthermore, the output harmonics content of phase shifted PWM (PSPWM) and in phase disposition PWM (IPDPWM) switching methods are comprised. This simulation results show that total harmonics content in IPDPWM is less than PSPWM method; besides, modified switching method of IPDPWM which solves the unequal power sharing problem of it is also proposed. This switching method is applied to a 7 levels inverter which is fed by three PV array DC sources and supply an AC load. These PV arrays deliver maximum power via DC-DC converter and perturb and observe algorithm. Simulation results show effectiveness of this method in sharing equal powers among different cells of the multilevel inverter which are supposed to be PV arrays; furthermore, results show that DC voltage ripples which cause inter harmonics are less than previous similar switching method; Hence for allowable DC voltage ripple, smaller capacitor is required. Simulation is implemented by MATLAB/SIMULINK software.Keywords
Multilevel Inverter, Photovoltaic System, Power ConditioningFull Text