Abstract
As an important part of the smart grid, a wide-area measurement system (WAMS) provides the key technical support for power system monitoring, protection and control. But 20 uncertainties in system parameters and signal transmission time delay could worsen the damping effect and deteriorate the system stability. In the presented study, the subspace system identification technique (SIT) is used to firstly derive a low-order linear model of a power system from the measurements. Then, a novel adaptive wide-area damping control scheme for online tuning of the wide-area damping controller (WADC) parameters using the residue method is proposed. In order to eliminate the effects of the time delay to the signal transmission, a simple and practical time delay compensation algorithm is proposed to compensate the time delay in each wide-area control signal. Detailed examples, inspired by the IEEE test system under various disturbance scenarios, have been used to verify the effectiveness of the proposed adaptive wide-area damping control scheme.
Highlights
Inter-area electromechanical oscillation has been one of the most severe threats for the safe and economic operation of modern power systems [1,2] due to the increasing large interconnection of power grids
For the fast-development of smart grids, this paper presents a novel adaptive wide-area control scheme in which: (a) the subspace identification technique (SIT) is adopted to derive the linear model of power system, identify inter-area oscillation modes and calculate the measurement-based participation factor; (b) the control signals and the generators which need to be supplemented by wide area control information are determined; (c) the wide-area damping controllers (WADCs) with their parameters derived adaptively for power system stabilizer (PSS) are constructed; and (d) a simple but practical time delay compensator is designed to eliminate the effects of signal transmission time delay
This paper proposes a novel adaptive wide-area control scheme with consideration of signal time delay
Summary
Inter-area electromechanical oscillation has been one of the most severe threats for the safe and economic operation of modern power systems [1,2] due to the increasing large interconnection of power grids. Via synchronized signals from WAMS, a coupled vibration model based on the exact model of power system is well suited for off-line designs, while little information could be provided to on-site operators Instead, online approaches, such as Prony [9] and H∞ [10] analysis, have recently been presented to conduct online inter-area electromechanical oscillation parameter extraction and damping control. For the fast-development of smart grids, this paper presents a novel adaptive wide-area control scheme in which: (a) the subspace identification technique (SIT) is adopted to derive the linear model of power system, identify inter-area oscillation modes and calculate the measurement-based participation factor; (b) the control signals and the generators which need to be supplemented by wide area control information are determined; (c) the wide-area damping controllers (WADCs) with their parameters derived adaptively for PSS are constructed; and (d) a simple but practical time delay compensator is designed to eliminate the effects of signal transmission time delay. Simulations on the IEEE test system under various disturbance scenarios have validated that the presented adaptive wide-area control scheme for damping inter-area oscillation is effective and robust
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