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首页> 外文期刊>Journal of Energy Engineering >Time-Varying Sliding Mode Control Strategy for Multibus Low-Voltage Microgrids with Parallel Connected Renewable Power Sources in Islanding Mode
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Time-Varying Sliding Mode Control Strategy for Multibus Low-Voltage Microgrids with Parallel Connected Renewable Power Sources in Islanding Mode

机译：孤岛模式下具有并联可再生电源的多总线低压微电网的时变滑模控制策略

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摘要

In islanding microgrids (MGs), distributed generation units are in charge of controlling voltage, frequency, and current of the grid on their own without any assistance from the main grid. Therefore, it is of utmost importance to select and design a controller that is robust against disturbances and load variations. In this study, a new sliding mode controller with a rotating reference voltage algorithm is proposed that improves the load sharing between distributed generators (DGs) in an islanded mode MG. In the proposed algorithm, in order to improve the performance and convergence rate of the controller, the amplitude of the reference voltage signal of the controller is adaptively modified. As a case study, the proposed strategy is studied based on the assumption that there are three DGs in the grid. One of the DGs is in charge of regulating voltage and frequency based on a reference signal, and the two other DGs are responsible for load sharing and loads the current control mode. The MG under study consists of three low-voltage distributed generation units operating in parallel mode. In order to have a realistic case study, it is assumed that the MG consists of different types of loads such as balanced/unbalanced resistive, inductive, and nonlinear loads. The extensive simulations are applied to indicate that the proposed framework is able to provide more desirable total harmonic distortion (THD), lower steady-state error, and faster response compared with classic sliding mode controllers.
机译：在孤岛微电网（MGs）中，分布式发电单元可自行控制电网的电压，频率和电流，而无需主电网的任何帮助。因此，选择和设计对干扰和负载变化具有鲁棒性的控制器至关重要。在这项研究中，提出了一种具有旋转参考电压算法的新型滑模控制器，该控制器改善了孤岛模式MG中分布式发电机（DG）之间的负载分配。在提出的算法中，为了提高控制器的性能和收敛速度，自适应地修改了控制器的参考电压信号的幅度。作为案例研究，在假设网格中存在三个DG的前提下研究了所提出的策略。其中一个DG负责根据参考信号调节电压和频率，其他两个DG负责负载共享和负载电流控制模式。研究中的MG由三个并联运行的低压分布式发电单元组成。为了进行实际的案例研究，假设MG由不同类型的负载组成，例如平衡/不平衡的电阻，电感和非线性负载。进行了广泛的仿真，表明与经典滑模控制器相比，所提出的框架能够提供更理想的总谐波失真（THD），更低的稳态误差和更快的响应。

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