| 引用本文: | 左 航,李小鹏,徐方维,等.基于有理函数逼近的光耦合隔离放大器宽频域建模方法[J].电力系统保护与控制,2021,49(9):113-120. |
| ZUO Hang,ZUO Hang,ZUO Hang,et al.Wide frequency domain modeling method of an OCIA based on rational function approximation[J].Power System Protection and Control,2021,49(9):113-120 |
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| 摘要: |
| 目前光耦合隔离放大器频率特性的获取方法多是基于额定参数推算，但经过长时间运行后，内部元件参数因老化发生改变，隔离放大器内部元件不再以额定参数工作，导致基于额定参数得到的频率特性不再准确。针对这一问题，提出一种光耦合隔离放大器宽频域建模方法。在不依赖其元件参数的情况下，通过测量不同频率下隔离放大器传递函数值，基于有理函数逼近拟合原理构造误差函数，采用粒子群优化算法对该误差函数进行迭代求取最优解及拟合传递函数表达式。在不同噪声水平下对算法的准确性进行研究，基于仿真与实测数据验证了所提方法在宽频域下具有较高的准确性和良好的抗噪能力。 |
| 关键词: 有理函数逼近 光电耦合隔离放大器 直流电压互感器 粒子群算法 宽频频率特性 |
| DOI：DOI: 10.19783/j.cnki.pspc.200835 |
| 分类号: |
| 基金项目:国家电网公司总部科技项目资助(5200-2019 26078A) |
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| Wide frequency domain modeling method of an OCIA based on rational function approximation |
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ZUO Hang, LI Xiaopeng, XU Fangwei, SHU Qin, QIU Jin
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(1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. State Grid Sichuan Electric Power
Research Institute, Chengdu 610041, China; 3. Wuhan Branch, China Electric Power Research Institute, Wuhan 430074, China)
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| Abstract: |
| Many existing methods of obtaining Optically Coupled Isolation Amplifier (OCIA) frequency characteristics are based on the estimation of rated parameters. The internal component parameters change after a long period of operation, and the internal components of the transformer no longer work with the rated parameters. As a result, the frequency characteristics obtained based on the rated parameters are no longer accurate. To solve this problem, this paper proposes a new OCIA wide frequency domain modeling method without relying on OCIA parameters. The OCIA transfer function values at different frequencies are obtained by measurement, and the error function is constructed based on the rational approximation fitting principle. Then the particle swarm optimization algorithm is used to optimize the error function, and obtain the expression of the fitting transfer function. The accuracy of the algorithm is studied in different frequency sampling ranges and noise levels. Simulation and measured data verify that the proposed method has high accuracy and good anti-noise ability in the wide frequency domain.
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China (No. 5200-201926078A). |
| Key words: rational function approximation optically coupled isolation amplifier (OCIA) DC voltage transformer (DCVT) particle swarm optimization (PSO) wide-band frequency characteristics |
