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Conventional load shedding control strategy adjusts undervoltage load shedding and underfrequency load shedding respectively, and undervoltage load shedding only focuses on local voltages without consideration on characters of transient voltage responses. This paper analyses the relationship between the disturbance scale and transient voltage drops, thus proposing a novel index for the disturbance...
Based on offline studies and past experiences, a novel adaptive coordinated voltage control (ACVC) strategy is proposed in this two-part paper. An efficient adaptive response is realized by searching in a limited solution space which is defined by the prepared system knowledge. The system knowledge is acquired from offline studies and then further accumulated from online experiences by learning. With...
Adaptive coordinated voltage control provides coordination of various devices within a wide area and adapts to the changing dynamics of power systems subjected to a series of faults. A new adaptive control is proposed for coordinated voltage control in this paper. The off-line training and on-line learning is used to acquire system knowledge. Accompanied by the system knowledge stored in a long-term...
Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. In the recent past Power System Stabilizer (PSS) was used to damp LFO. FACTs devices, such as Unified Power Flow Controller (UPFC), can control power flow, reduce sub-synchronous resonance and increase transient...
Increasingly nonlinear dynamic loads have been connected into power systems; such as variable speed drives, robotic factories and power electronics loads. This adds to the complexity of load modeling. The increasing complexity of the modern power grid highlights the need for advanced modeling and control techniques for effective control of excitation and turbine systems. The crucial factors affecting...
Adaptive control theory has been recently used in damping the growing oscillations in power systems, enhancing the system response and improving system dynamic stability. This paper proposes a new robust adaptive control mechanism for FACTS. The adopted concept is the dead-zone modification based on model reference adaptive control (MRAC) technique. The developed controller aims to overcome the variation...
In this paper, a nonlinear static var compensator (SVC) controller is proposed to improve power system voltage stability. A third order nonlinear dynamical description for the SVC system is developed and used in the controller design. Adaptive and robust control techniques are employed to deal with both constant and time varying uncertainties in a power system with SVCs. The effectiveness of the controller...
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