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Power System Analysis
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In this paper, the authors present a model for estimating the Impedance of Transmission Lines and the Capacitance of Transformer Lines in the presence of Symmetrical Faults.Abstract:
1 Basic Concepts 2 Transformers 3 The Synchronous Machine 4 Series Impedance of Transmission Lines 5 Capacitance of Transmission Lines 6 Current and Voltage Relations on a Transmission Line 7 The Admittance Model and Network Calculations 8 The Impedance Model and Network Calculations 9 Power Flow Solutions 10 Symmetrical Faults 11 Symmetrical Components and Sequence Networks 12 Unsymmetrical Faults 13 Economic Operation of Power Systems 14 Zbus Methods in Contingency Analysis 15 State Estimation of Power Systems 16 Power System Stabilityread more
Citations
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System Impedance Measurement with a Three-Phase Converter
Abstract: Grid-connected converters are often used to feed power to the grid from renewable energy sources such as wind and solar farms. The stability of these grid-connected converters depends on the ratio between the converter output impedance and the grid impedance. This thesis studies impedance measurement in the dq-domain using wideband excitation signals. The aim of this thesis is to develop a software module to converter firmware that enables the converter to inject an excitation signal and measure the voltage and current responses. Impedance measurement system is tested using Simulink® simulations and the results are verified in laboratory environment. The simulation and measurement results show that wideband excitation signals can be used to accurately identify the direct components of the converter output impedance, but the measurements of the cross-impedances are highly susceptible to noise and measurement inaccuracies.
Journal ArticleDOI
Determination of Reactive Power Compensation Considering Large Disturbances for Power Flow Solvability in the Korean Power System
TL;DR: In this article, a branch-parameter continuation power flow (BCPF) tool is proposed to restore the power flow solvability in unsolvable contingencies in the Korean power system.
Slack bus modeling for distributed generation and its impacts on distribution system analysis, operation and planning
TL;DR: In this paper, a distributed slack bus model is proposed for distribution system analysis and planning, and the problem of distribution system expansion considering DG placement and feeder upgrade is addressed, and impacts on distribution operating and planning functions of slack bus modeling are investigated.
Stability analysis and control of discrete-time systems with delay
TL;DR: The Razumikhin approach is found to be an exact application of the small-gain theorem, which provides an explanation for the conservatism that is typically associated with this approach.
Proceedings ArticleDOI
Analysis on Security and Stability of Regional Power Grid
Tao Wang,Liqun Shang,Xianmin Ma +2 more
TL;DR: This paper analyses the typical operation mode of the regional power grid and according to different operation mode, the reactive power optimization is optimized and the corresponding measures to improve the level of power grid stability are put forward.