Abstract
Currently, wide‐area damping control has been considered one of the most effective and promising methods to solve the problem of interval low‐frequency oscillation in power systems. In order to reduce adverse affection caused by time delay in acquisition and transmission of wide‐area signals, an improved Prony prediction compensation‐based wide‐area damping control approach for power system low‐frequency oscillation suppression is proposed in this paper. Firstly, the influence of communication time delay on power system stability is analyzed by a small disturbance stability analysis method. An algorithm based on the improved Prony prediction algorithm is designed to predict the acquired signals with time delay. A second derivative‐based order determination algorithm is used to obtain the best effective order of the prediction model, and the parameter prediction step size of the prediction model is determined by the actual situation of time delay change. Finally, design of a wide‐area damping controller based on the improved Prony prediction compensation is presented in detail. The proposed control approach is conducted in a four‐machine and two‐zone power system, and the experiment results show that the proposed approach can effectively compensate for the signal under the conditions of fixed time delay and variable time delay and has better adaptability advantages than the traditional Prony prediction compensation method.
Highlights
With rapid development of power grids, the scale of power grids is increasing, more and more wide-area complex power grids are built, low-frequency oscillation [1], which threatens safe and stable operation of large-scale power grids, has widely received much attention in industry
This paper will prove that the Prony prediction compensation algorithm can solve the phase lag problem caused by time delay on the basis of the four-machine and two-zone system [13, 14]
The analysis shows that the calculation example has two local modes and one interval mode
Summary
With rapid development of power grids, the scale of power grids is increasing, more and more wide-area complex power grids are built, low-frequency oscillation [1], which threatens safe and stable operation of large-scale power grids, has widely received much attention in industry. Increase in electrical load and distance would exacerbate the problem of low-frequency oscillation. Long-distance and network uncertainty will introduce time-varying time delays which bring challenge to low-frequency oscillation suppression and power system stability. The low-frequency oscillation problem is closely related to the insufficient damping of the system. The main ideas of its solution are reducing negative damping and increasing positive damping of the power system as soon as possible when the presence of low-frequency oscillations of the power grid is detected. According to the difference of the above principle, solution methods for low-frequency oscillation suppression could be classified into grid structure optimization, high-voltage direct current (HVDC) transmission strategy, flexible AC transmission technology [2, 3], damping control [4,5,6], and so on. Among them, damping control is considered the most widely used and effective method
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