电压源型变流器的暂态同步稳定问题是一种典型的非线性问题，在多机系统中更是表现出复杂的高阶特性与交互耦合特性。为明确多控制模式变流器异构系统的交互耦合特性与暂态失稳机理，以跟网型变流器（grid-following voltage source converter，GFL-VSC）、构网型变流器（grid-forming voltage source converter，GFM-VSC）双机混合并网系统为研究对象，首先采用相量分析法建立了适用于暂态稳定分析的混合并联系统的数学模型，揭示了变流器之间交互耦合作用的产生机理。然后，通过引入三维曲面和等高线提出了一种可视化的稳定性分析方法，直观描绘了系统的平衡关系，并揭示了GFM-VSC有功功率参考值、无功功率控制回路以及GFL-VSC电流参考值对系统暂态同步稳定性的影响。结果表明，GFM-VSC无功功率控制的引入会恶化系统的平衡关系。在电网故障时，可以通过减小GFL-VSC有功电流注入并适当增大其无功电流注入，或减小GFM-VSC有功功率参考值来改善系统的稳定性。最后，利用硬件在环测试验证了理论分析的正确性。

The transient synchronous stability issue of voltage source converters is a typical nonlinear problem, which especially exhibits complex higher-order and interacting coupling characteristics in multi-converter systems. To clarify the interactive coupling characteristics and transient instability mechanism of the heterogeneous system with multiple control mode converters, a dual- converter hybrid grid-connected system consisting of grid-following voltage source converter （GFL-VSC） and grid-forming voltage source converter （GFM-VSC） is studied. Firstly, the mathematical modeling of the hybrid parallel system for transient stability analysis is developed using phasor analysis, and the mechanism of interactive coupling between two inverters is revealed. Then, by introducing three-dimensional surfaces and contour lines, a visual stability analysis method is proposed, which can intuitively describe the system balance relationship. Furthermore, the effects of the active power reference and reactive power control circuit of GFM-VSC and the current reference of GFL-VSC on transient stability are revealed in detail. The results show that the reactive power control introduction of GFM-VSC deteriorates the system balance relationship. The stability of the system can be improved by decreasing the active current injection of GFL-VSC and increasing its reactive current injection, or by decreasing the active power reference of GFM-VSC during grid faults. Finally, the hardware-in-the-loop experiments verify the correctness of the theoretical analysis.