针对高比例光伏发电系统网侧变弱潜在的高频谐振问题,提出一种基于输出电流直接前馈的新型阻尼控制方案,并对环路谐振抑制参数整定的全局-局部运行双重约束进行研究。首先,建立光伏多机并网系统数学模型,利用阻抗比判断潜在的高频谐振。其次,对逆变器串电阻环路变换构建等效的输出电流直接前馈控制环路,通过分析不同谐振抑制参数下系统全局高频谐振治理效果及单台逆变器局部运行状态,以全局-局部稳定为双重约束确定了谐振抑制参数可行域,并分析电气参数随运行状态变化下所提方案的抗扰能力。最后,搭建光伏多机并网系统的仿真实验平台验证上述研究的有效性。
Abstract
A novel current direct feed-forward damping control strategy and the optimization on damping parameter based on dual limitations are proposed to suppress the high frequency resonance of the grid-connected system with multiple PV inverters under weak grid. Firstly, based on impedance criterion, the mathematical model of the grid-connected system with multiple PV inverters is built to predict the potential high frequency resonance. Then, the control loop of the current direct feed-forward damping with equivalent physical connection is obtained by forward moving of the inverter series with resistance. By analyzing the global harmonic suppression effect of the system and the self-stability of the inverter with different damping parameters, the value of the damping parameter is evaluated based on dual limitations of global stability and self-stability. Moreover, the control ability of proposed method with different electrical parameters under various operating status is analyzed. Finally, simulations and experiments of the grid-connected system with multiple PV inverters are built to verify the effectiveness of the front analysis.
关键词
光伏发电 /
逆变器 /
谐振 /
前馈控制 /
双重约束 /
参数整定
Key words
photovoltaic generators /
inverter /
resonance /
feedforward control /
dual limitations /
parameter optimization
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基金
河北省重点研发计划（19214405D）; 国家自然科学基金（51677162）
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