功率硬件在环仿真系统性能分析

Performance Analysis of Power Hardware-in-Loop Simulation

功率硬件在环仿真技术又称数字物理混合仿真技术,其结合了实时数字仿真和模拟物理仿真的优点,是分析电力系统故障工况、研究分布式发电并网等技术的有效手段。而接口算法作为仿真系统中的一个重要组成部分,是保证系统稳定和仿真精度的关键。文中主要针对阻尼阻抗模型和理想变压器模型2种接口算法,讨论了基于这2种接口算法的硬件在环仿真系统的稳定性和仿真精度,构建了基于频域分析的可视化多维图,直观地分析了阻抗关系、谐波频率以及延时等因素对仿真精度的影响,并通过实验验证所述观点及结论。最后,根据上述分析结果给出了配置硬件在环仿真系统的若干建议。

Combining the advantages of real-time digital simulation and analog physical simulation,power hardware-in-loop(PHIL)simulation,also named digital-physical hybrid simulation,is an effective method to analyze fault condition of power system and study distributed generation grid-connected technology.As an important part of PHIL,interface algorithm is a key to ensure system stability and simulation accuracy.This paper investigates two interface algorithms:damped-impedance model and ideal transformer model,and stability and simulation accuracy of PHIL based on above two interface algorithms are discussed respectively.Frequency-domain-based visualized multi-dimensional graphs are constructed to intuitively analyze the influence of impedance relation,harmonic frequency and delay on simulation accuracy.Then,these viewpoints and conclusions are verified with experiments.Finally,according to above analysis,several suggestions are given to configure a practical PHIL.