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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Sliding Mode Controller with Integral Action for DC-Link Voltage Control of Grid-Integrated Domestic Photovoltaic Systems
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Sliding Mode Controller with Integral Action for DC-Link Voltage Control of Grid-Integrated Domestic Photovoltaic Systems

机译：具有电网集成国内光伏系统直流链路电压控制的滑模控制器

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摘要

The grid integration of photovoltaic systems is preferred over the islanded mode of operation as the former does not require additional storage element, hence less maintenance and no chemical pollution. To regulate power exchange between the grid and the photovoltaic system, a robust DC-link voltage controller capable of withstanding the intermittent nature of solar energy and sudden variations in load is inevitable. A proportional–integral controller is used for DC-link voltage control, exhibiting oscillations during steady state and overshoot during transients. However, the conventional sliding mode controller reduces the overshoot at the expense of increased steady-state error. This paper proposes a robust sliding mode controller for DC-link voltage control to reduce steady-state error by incorporating integral action to the conventional sliding mode controller. The harmful effect of chattering phenomenon is minimised by limiting the error in the control variable using a signum function. The added features of the work include an incremental conductance method for obtaining maximum power from the photovoltaic system, instantaneous pq theory-based self-tuning filter for the extraction of fundamental component and inverter switching pulse generation using hysteresis current control technique. The grid-integrated photovoltaic system along with all features is modelled and simulated in MATLAB/Simulink platform. The results of numerical simulations carried out for various system conditions illustrate that the proposed controller provides superior performance when compared to proportional integral controller and conventional sliding mode controller in terms of harmonic compensation, power flow balance and speed of response at all system conditions.
机译：由于前者不需要额外的储存元件，光伏系统的电网集成是优选的，优选岛立的操作模式，因此较少维护和无化学污染。为了调节电网和光伏系统之间的电源交换，一种能够承受太阳能的间歇性和负载突然变化的强大的直流连接电压控制器是不可避免的。比例积分控制器用于直流链路电压控制，在恒定状态下在稳定状态下呈现振荡并在瞬变期间过冲。然而，传统的滑动模式控制器以增加稳态误差的费用减小过冲。本文提出了一种强大的滑动模式控制器，用于DC-LINK电压控制，通过将整体动作结合到传统的滑动模式控制器来减小稳态误差。通过使用Signum函数限制控制变量中的误差，最小化抖动现象的有害效果。该工作的附加功能包括用于获得光伏系统的最大功率的增量电导方法，使用滞后电流控制技术提取基于基于PQ理论的自整定滤波器，用于提取基本分量和逆变器开关脉冲发生。网格集成的光伏系统以及所有特征在Matlab / Simulink平台中建模和模拟。对各种系统条件执行的数值模拟结果说明了与在谐波补偿，电力流量平衡和所有系统条件下的响应速度方面相比，所提出的控制器提供卓越的性能。

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