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Wind turbine installation is increasing rapidly. In some networks, wind power penetration is significantly high and the performance of wind turbine plays an important role in power system operation and control. Especially, the behavior of wind turbines during a power system disturbance would affect power system stability and supply security. Some existing wind turbines are still based on fixed speed...
This paper presents a graphical explanation on the damping torque analysis (DTA) method. The explanation is established based on small-signal equal-area criterion of power system stability analysis. From the graphical explanation, a generalized approach for the analysis of damping effectiveness of power system control is proposed. An example is given in the paper to demonstrate how the generalized...
Large number of wind turbines are being installed and connected to power systems. In some countries or networks, the penetration level of wind power is significant high so as to affect the power system operation and control. Consequently, the stable operation of wind turbine systems is very important for power system stability. This paper studies the effect of STATCOM on stability improvement of a...
The authors present the results of feasibility study of a novel concept of power system online collaborative voltage stability control. Online collaboration between power system controllers is proposed in order to enhance their overall performance and efficiency to cope with the increasing operational uncertainty of modern power systems. The framework of the proposed online collaborative voltage stability...
The concept of power system post-emergency rotor angel control (PERAC) based on the framework of the third- category control and multi-agents system is proposed in this paper. It has been implemented in the control scheme with On-line Pre-decision System (OPS) to retain the power system's angel stability when the system meets the unexpected cascading contingencies during one fixed updating cycle of...
The development of renewable energy based generation technologies attracts more and more attention. In particularly large number of wind turbines are being installed and connected to power system. In some countries or networks, the penetration level of wind power is significant high so as to affect the power system operation and control. Consequently, the stable operation of wind turbine systems is...
Unified power flow controller (UPFC) is of multiple control functions to regulate AC voltage, active power and reactive power flow. Research has found that existence of dynamic interactions among those multiple control functions may result in poor control performance and even closed-loop system instability. This paper investigates the UPFC's controllable parameter region with variations of UPFC control...
This paper proposes the concept of power system post-emergency voltage control (PEVC) as a measure to defend important area in a power system against voltage collapse based on a framework of the third-category control and multi-agents system. The main feature of PEVC is to launch functions in real time according to unexpected power system events via information exchange. Both the dynamic co-ordination...
With the development of power electronic techniques, more and more attention has been paid to DC power systems. This paper analyzes the load flow issues containing DC/DC converters in a DC power system. The load flow model of DC/DC converters, which considers the power losses and control strategy of the converter, has been presented and integrated into the traditional load flow algorithm by modifying...
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