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Semi-physical modeling and control of a centrifugal compressor for the air feeding of a PEM fuel cell

机译：用于PEM燃料电池供气的离心压缩机的半物理建模和控制

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摘要

Air compressor which is to used to deliver the air (including about 21% oxygen) to the cathode channel for electrochemical reaction is a crucial component for the polymer electrolyte membrane (PEM) fuel cell. The working characteristics of the compressor greatly influences the fuel cell performance as well as the durability. In this paper a semi-physical modeling method is adopted to analyze the operating property of a centrifugal compressor which is more suitable for automotive fuel cells because of its compactness. This model includes many physical and empirical parameters which are very difficult to determine. Interior-point optimization method based on Newton iteration is used to identify those parameters. The result shows that the modeled compressor map has a good agreement with the experimental data. Meanwhile, the compressor efficiency is analyzed and compared with the measurement to further validate the developed model. This compressor is thus adapted to a validated 10 kW fuel cell model. A dynamic feedforward controller is proposed based on the load torque to control the air mass flow, eliminating the disturbance produced by the compressor load in transient. The simulation results show that this compressor could satisfy requirements of the fuel cell under dynamic load situations while keeping both the fuel cell and compressor with high efficiencies.
机译：用于将空气（包括约21％的氧气）输送到阴极通道以进行电化学反应的空气压缩机是聚合物电解质膜（PEM）燃料电池的关键组件。压缩机的工作特性极大地影响了燃料电池的性能以及耐用性。本文采用半物理建模方法来分析离心压缩机的工作特性，该离心压缩机由于其紧凑性而更适合于汽车燃料电池。该模型包含许多很难确定的物理和经验参数。基于牛顿迭代的内点优化方法用于识别这些参数。结果表明，所建立的压缩机图与实验数据吻合良好。同时，对压缩机效率进行分析，并与测量值进行比较，以进一步验证所开发的模型。因此，该压缩机适用于经过验证的10 kW燃料电池模型。提出了一种基于负载转矩的动态前馈控制器，以控制空气质量流量，消除了压缩机负载在瞬态过程中产生的干扰。仿真结果表明，该压缩机能够在动态负载情况下满足燃料电池的要求，同时保持燃料电池和压缩机的高效能。

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