随着大规模分布式发电技术的出现,为支持微电网的稳定运行,提出虚拟同步发电机（VSG）技术。由于VSG常用的电压电流双闭环控制存在动态响应时间久、抗扰动能力弱的缺点,考虑LADRC对扰动具有更优异的动态响应速度,该文提出一种用于VSG电压外环控制的线性自抗扰控制方案,并采用RBF对LADRC中的关键参数进行在线整定,以实现控制器的实时优化。在Matlab/Simulink平台下搭建仿真模型,并对所提出的改进策略与传统控制策略进行仿真对照,结果显示该策略可有效提高并网环境下虚拟同步发电机功率和频率稳定性。
Abstract
With the emergence of large-scale distributed generation technology, a solution such as virtual synchronous generator （VSG） technology is proposed to support the stable operation of microgrids. Since the voltage-current dual closed-loop control commonly used in VSG has the shortcomings of long dynamic response time and weak perturbation resistance, considering that LADRC has a superior dynamic response speed to perturbations, this paper proposes a linear self-immunity control scheme for the voltage outer-loop control of VSG, and adopts the RBF for the on-line tuning of the key parameters in the LADRC in order to realize the optimization of the controller in real time. The simulation model is built under the MATLAB/Simulink platform and the proposed improved strategy is simulated against the traditional control strategy, and the results show that the strategy can effectively improve the power and frequency stability of the virtual synchronous generator under the grid-connected environment.
关键词
分布式发电 /
RBF神经网络 /
线性自抗扰控制 /
虚拟同步发电机
Key words
distributed power generation /
radial basis function networks /
linear active disturbance rejection control /
virtual synchronization generator
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基金
国家自然科学基金（51777120）; 上海市2021年度“科技创新行动计划”科技支撑碳达峰碳中和专项（第一批）（21DZ1207502）
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