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Appropriate modeling of dynamic loads is of primary importance in voltage stability studies, especially increasing use of induction machines in both consumption and generation. This paper is mainly related to short-term voltage instability depending on time domain simulation. The actuality of voltage instability research is summarized, and the mechanisms of short- term voltage stability are explained...
Distributed generation in microgrid is mainly composed of new energy and renewable energy resources. The maximum power point of the PV cell array is various from time to time with the change of circumstance and load. The fuzzy control can react to the environment change quickly and keep the photovoltaic system work on its maximum power point all the time. However, the limitation in the fuzzy control...
Wide area damping control (WADC) is a novel technique used to solve the inter-area oscillation problem. Unlike the local control, time delay is involved in the transmission of wide area signals, which can not be ignored. In this paper, time delay effects on WADC are analyzed from the view of frequency domain. A new stability criterion is proposed to calculate the time tolerance based on Pade approximation...
In this paper, a method is proposed for fast and accurate online detection of transient instability based on real-time measurement. The cluster of critical machines is determined and refreshed at each time. Determination of the irrevocable loss of synchronism is made based on the geometric characteristic of critical machines trajectory. Unlike the previous extended equal-area criterion method, it...
Wide-area measurement system (WAMS) provides a platform for more efficient control, and some discontinuous types of wide-area control projects have been reported in commission in the recent years. In this paper, a continuous type of wide-area damping control system (WADCS) is introduced, which is used to suppress the inter-area oscillations in a complicated real power grid by modulating multiple HVDC...
In this paper, a method, which is essential in initiating emergency control measures, is proposed for fast and accurate online detection of transient instability based on real-time measurement. Under a certain disturbance, the candidate critical cluster of power system is predicted and refreshed at each sampling step. The method identifies the loss of synchronism at each time step by observing the...
Low frequency oscillation is becoming a serious bottleneck limiting power system stability enhancement, especially in the conditions of interconnections of regional networks. Because of the global properties, most of the units are involved in this problem. The controllers of these devices must be designed coordinately. In this paper, an optimal controller design approach is proposed for the applications...
This paper is concerned with large scale, interconnected, AC/DC transmission network of a power system. As the system grid becomes larger and power demand becomes higher, low frequency oscillation has become the primary concern of power system stability. High voltage direct current (HVDC) modulation control is a traditional means of damping the low frequency swing. However, for multi-infeed system,...
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