Abstract
In recent years, wind power systems have been used extensively, which not only improve the efficiency of current conventional power generation systems, but also can save traditional fossil fuel resources. However, considering the instability of wind power, after being grid connected, it can easily cause an impact on the stability of the grid operation. Considering the above problems, this paper considers to make full use of the energy storage part of electric vehicles (EVs) to increase the stability of grid operation. Based on the mathematical model, this paper studies the load frequency control (LFC) problem of a multi-region interconnected power system with wind power and EVs. First, since the system states are difficult to be monitored, a state observer is designed to estimate the state. Based on this, the integral sliding mode controller (SMC) is designed to realize the LFC of the interconnected power system. Meanwhile, to obtain better control performance, this paper further analyzes and optimizes the controller parameters based on Lyapunov stability theory. At last, simulations are carried out for the power systems with two regions in Simulink. The results show that the designed controllers are effective to compensate the load demand disturbances. In addition, it is demonstrated that the battery storage of EVs can play the role of peak-shaving and valley-filling in LFC.
Highlights
Published: 19 April 2021With the development of grid technology, communication technology is gradually integrated into the grid
After the wind power is connected to the grid, to solve the impact of its uncertainty on the system frequency stability, the energy storage of idle electric vehicles (EVs) is considered as the buffer in this paper
Based on the model, we focus on the theoretical analysis of the state observer, the sliding mode controller (SMC), and the stability of the system
Summary
With the development of grid technology, communication technology is gradually integrated into the grid. The point should be noted that, to reduce fluctuations in the frequency of the load, the traditional energy storage methods such as batteries are used in general It increases the economic cost of grid construction, and fails to make full use of the energy storage capacity of idle EVs. In addition, when the system suffers from load demand disturbances, the load frequency is affected and fluctuates. To reduce the deviation of load frequency after area interconnection, it is necessary to study the LFC of the complex system containing wind power and EVs using the sliding mode control. After the wind power is connected to the grid, to solve the impact of its uncertainty on the system frequency stability, the energy storage of idle EVs is considered as the buffer in this paper.
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