【目的】单变流器驱动多台永磁同步电机(PMSM)并联运行的系统架构，能够显著降低硬件成本、减小系统体积并提高功率密度，已成为一种极具经济效益的技术方案。然而，传统控制策略通常采用平均模型或多坐标系模型，不仅增加了系统建模的复杂性，还可能导致控制精度下降和动态响应变差。针对此问题，本文提出了一种基于统一坐标系的单变流器多PMSM并联系统控制策略，旨在简化控制结构并提升系统性能。【方法】首先，采用频域分析法对系统的电磁特性和机械特性进行深入研究。在此基础上，提出了一种基于统一坐标系的矢量控制策略，通过统一坐标系下的数学模型简化了多电机系统的控制复杂度。最后，为验证所提策略的有效性，搭建了时域仿真模型，分析了不同工况下的系统运行情况，并对控制系统的动态响应和稳态精度进行了全面测试。【结果】仿真结果表明，当两台PMSM的负载转矩不同或发生动态变化时，所设计的控制系统能够快速、准确地调节电机转速，使其良好地跟随给定转速，验证了所提控制策略的有效性和实用性。【结论】本文所提基于统一坐标系的单变流器多PMSM并联系统控制策略，不仅简化了传统多电机系统的控制结构，还显著提升了系统的动态性能和稳态精度，为单变流器驱动并联PMSM系统的控制优化提供了新的思路。

[Objective] The system architecture of single-inverter multiple permanent magnet synchronous motor (PMSM) in parallel operation can significantly reduce hardware costs, minimize system size, and improve power density. It has become a highly cost-effective technical solution. However, traditional control strategies often adopt average models or multiple coordinate system models, which not only increase the complexity of system modeling, but may also lead to reduced control accuracy and degraded dynamic response. To address this issue, this study proposes a control strategy for a single-inverter multi-PMSM parallel system based on a unified coordinate system, aiming to simplify the control structure and enhance system performance. [Methods] First, the electromagnetic and mechanical characteristics of the system were investigated using frequency domain analysis. Building upon this, a vector control strategy based on a unified coordinate system was proposed. By employing a mathematical model in the unified coordinate system, the control complexity of the multi-motor system was reduced. Finally, a time-domain simulation model was established to validate the effectiveness of the proposed strategy. The system operation under different operating conditions was analyzed, and the dynamic response and steady-state accuracy of the control system were comprehensively tested. [Results] The simulation results showed that when the load torques between the two PMSMs differed or underwent dynamic variations, the designed control system was able to rapidly and accurately regulate motor speeds to closely follow the given speed commands. This verified the effectiveness and practicality of the proposed control strategy. [Conclusion] The control strategy for single-inverter multi-PMSM parallel systems based on a unified coordinate system proposed in this study not only simplifies the control structure of traditional multi-motor systems, but also significantly enhances both dynamic performance and steady-state accuracy. It provides new insights for control optimization in single-inverter parallel PMSM systems.

国家自然科学基金面上项目(51977220)