针对由可再生能源组成的直流电网电解氢系统,通过设计一种基于线性二次型最优控制（LQR）的全状态反馈控制方法,建立全状态误差量的小信号模型,利用系统状态误差量反馈的方法,在新能源并网带来的供电干扰和负荷波动下,改善DC-DC变流器的动态特性,提高电解设备的运行效率和槽内材料的寿命。结果证明,该方法可以显著地降低系统的电压、电流波动时间,且与常规的PI控制相比,对系统干扰的抑制效果更好。最后,对线性二次型最优控制所提出的理论与方法进行仿真验证,证明其正确性与适用性。
Abstract
This paper proposes a full state feedback control method based on linear quadratic optimal control（LQR） for a DC power grid electrolysis hydrogen system composed of renewable energy sources. A small signal model with full state error is established, and the system state error feedback method is used to improve the dynamic characteristics of the DC-DC converter, improve the operational efficiency of electrolysis equipment, and prolong the life of materials in the tank under the power supply interference and load fluctuations caused by the integration of new energy sources into the grid. The results show that this method can significantly reduce the voltage and current fluctuation time of the system, and compared with conventional PI control, it has a better suppression effect on system interference. Finally, the theory and method proposed in the article were simulated and verified to demonstrate their correctness and applicability.
关键词
新能源 /
DC-DC变流器 /
电解制氢 /
状态反馈 /
线性二次型最优控制 /
抗扰特性
Key words
new energy /
DC-DC converters /
hydrogen production /
state feedback /
LQR /
tolerance characteristic
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参考文献
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基金
国家电网公司科技项目（B311ZS220001）
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