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This paper studies the problem of the sub-synchronous oscillation, which caused by the interaction between VSC converter and non-series compensated weak grid. The model of VSC converter at grid side under small signal is constructed. Furthermore, eigenvalue analysis method is applied to analysis the model of oscillation modes, and by calculating damping ratio and correlation factors, the key parameters...
To investigate the robustness of face recognition algorithms under the complicated variations of illumination, facial expression and posture, the advantages and disadvantages of seven typical algorithms on extracting global and local features are studied through the experiments respectively on the Olivetti Research Laboratory database and the other three databases (the three subsets of illumination,...
In order to satisfy the controllability and security requirement for power systems, the TCSC (Thyristor Controlled Series Capacitor) is installed on the UHV (Ultra High Voltage) line. The UHV and high current become the challenge to TCSC, i.e. with the substantial increase of the rated current of the TCSC, the current flowing through the thyristor branch should also be improved, which may exceed the...
Fault restoration on regional power grids is a multi-objective, multi-constrained and complex optimization problem. An analytical model based on subsystem-switch for on-line fault restoration is built. Based on the matrix elimination, the algorithm of searching recovery path is presented. Targeting at the recovery of the connection strength, design the restore strategy. Considering the overload of...
To quantify the oscillation characteristics of wind power systems, the stator dynamics of the induction generators is included. An interface including the stator voltage angle is given, changing the network parameter to the dq frame, which proves that the stator dynamics can not be ignored for practical systems with limited synchronous capacity. But the stator parameters can not be chosen as the state...
The static var compensators (SVCs) widely applied in power system have remarkable effect on fast voltage control and var compensation, and help to improve voltage stability and transmission capability. Their control function is decided by the reference voltage, the slope, and the time constant. Since there are possibly multiple SVCs closely located, the control parameters should be carefully set to...
With increasing installation capacity and energy production, wind power plays more important role in power systems. In transient stability analysis, detailed modeling to each induction generator and wind turbine will introduce lots of calculation effort, which necessitates dynamic equivalence to induction generators and wind turbines in the same wind farm, or wind farms closely located. In this paper,...
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