The accuracy of a power-hardware-in-loop (PHIL) simulation is influenced by factors such as dynamics of the power amplifier (PA) and discretization of the real-time simulated part of the system. An open-loop voltage-source inverter (VSI) without an output filter is demonstrated to be a good choice for power amplification in terms of cost, size, design effort, bandwidth, and accuracy when the load on the PA is significantly inductive. An open-loop-VSI-based PA is shown to be accurate in emulating a synchronous generator, including the fast transients in the excitation control system. The discretization effects of the real-time simulator are captured effectively by the discrete-time (DT) modeling approach proposed in this paper. The DT model is shown to replicate fast transients in the PHIL simulation better than the existing continuous-time-based model. Stability of the PHIL simulation of a benchmark circuit is analyzed using the proposed DT modeling approach. The stability analysis is validated through simulations and experiments. The stability limits derived based on the proposed analysis are capable of suggesting maximum and minimum values of certain circuit parameters, as required for stability.

中文翻译：

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使用开环逆变器作为功率放大器提高功率硬件在环仿真的准确性、建模和稳定性分析


功率硬件环路 (PHIL) 仿真的准确性受到功率放大器 (PA) 动态和系统实时仿真部分离散化等因素的影响。当 PA 上的负载具有显着感性时，从成本、尺寸、设计工作量、带宽和精度方面来看，不带输出滤波器的开环电压源逆变器 (VSI) 被证明是功率放大的良好选择。基于开环 VSI 的 PA 可准确模拟同步发电机，包括励磁控制系统中的快速瞬态。本文提出的离散时间（DT）建模方法有效地捕捉了实时模拟器的离散化效果。 DT 模型在 PHIL 仿真中显示出比现有的基于连续时间的模型更好地复制快速瞬态。使用所提出的 DT 建模方法对基准电路的 PHIL 仿真的稳定性进行了分析。通过模拟和实验验证了稳定性分析。根据所提出的分析得出的稳定性极限能够根据稳定性的需要建议某些电路参数的最大值和最小值。