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A novel criterion for exactly identifying the machine leading to overvoltage of the common bus among the machines working in parallel is developed. Lose of selectivity of existing schemes in some cases is discussed. Correspondingly, an improved scheme is proposed. The change of nonload electromotive force (EMF) of generator is used to design a correction coefficient for the operation time characteristic...
This paper mainly study on the coordinated voltage control scheme with model predictive control (MPC). As the decomposition-coordination technology and the auxiliary problem principle is employed into the MPC based voltage control problem, a distributed voltage control model and structure can be obtained, and the global centralized optimization problem is decomposed into some sub-problems. All sub-problems...
Voltage collapse is one of the most importance reasons leading to the catastrophic failure of power systems. Therefore, many attentions are paid to this research field in recent years. In this paper, The method to mitigate system voltage depressions is studied, which is implemented by combining Reactive Current droop Compensation scheme and Line Drop Compensation scheme. Based on a widely accepted...
In this paper a deadbeat control system with a novel 3-dimension (3-D) space vector modulation scheme for 3-phase 4-wire tri-level three-leg Active Power Filter (APF) is proposed. To improve the compensation effect a repetitive harmonic predictor is utilized to predict the harmonic current and a state observer is used to estimate the output currents of the APF at the sampling instants in the deadbeat...
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