1.西安交通大学电气工程学院,710049,陕西西安
2.国家电网有限公司西北分部,710048,陕西西安
收稿:2025-12-26,
修回:2026-05-06,
录用:2026-05-16,
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吴佳泽, 范越, 牛拴保, 等. 考虑复杂控制切换特性的HVDC稳态建模及系统平衡点求解[J]. 西安交通大学学报,2026.
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为解决高压直流输电系统在运行方式变化下因控制模式多样化所导致的机电暂态仿真初始化误差大及静态安全分析可靠性不足的问题,本文构建了一种基于完整非线性切换代数方程组的直流系统稳态模型,并提出一种交替迭代解耦计算方法,通过先更新直流注入电流、再求解网络方程,实现交直流系统的协同求解。在改进的16机68节点系统上的仿真结果表明,所提方法直接计算得到的故障后功角及各节点电压与时域仿真结果高度一致,误差控制在1%以内;基于等面积法的临界切除时间计算值与时域仿真结果吻合良好,验证了该模型对直流系统模式切换行为的有效捕捉能力。本文模型与方法能够精确求解故障后平衡点,适用于含直流系统的电力系统安全稳定评估。
To address the issues of large initialization errors in electromechanical transient simulation and insufficient reliability in static security analysis caused by diverse control modes of high-voltage direct current (HVDC) systems under varying operating conditions
this paper constructs a steady-state model of HVDC systems based on a complete set of nonlinear switching algebraic equations. An alternating iteration decoupled solution method is proposed
which sequentially updates the DC injection current and solves the network equation to achieve the coordinated solution of the AC-DC system. Simulation results on a modified 16-machine
68-bus system demonstrate that the post-fault rotor angles and bus voltages computed by the proposed method are highly consistent with time-domain simulation results
with errors controlled within 1%. The critical clearing time calculated using the equal-area criterion shows good agreement with time-domain simulation results
verifying the effectiveness of the proposed model in capturing the mode-switching behavior of the HVDC system. The proposed model and method can accurately solve for the post-fault equilibrium point and are suitable for the security and stability assessment of power systems incorporating HVDC transmission.
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