| 引用本文: | 唐 欣,屈 贝,张睿宁,等.多端直流配电系统负载变流器相位补偿控制策略[J].电力系统保护与控制,2025,53(02):50-61.[点击复制] |
| TANG Xin,QU Bei,ZHANG Ruining,et al.Phase compensation control strategy for load converters in multi-terminal DC distribution system[J].Power System Protection and Control,2025,53(02):50-61[点击复制] |
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| 摘要: |
| 在多端直流配电系统中，定功率控制负载变流器的恒功率特性会降低系统阻尼，易引发直流电压和直流电流振荡，导致系统失稳。为此，提出一种基于直流电压前馈的相位补偿控制策略。首先，推导了负载变流器的直流侧阻抗模型，并基于连分式理论对阻抗模型进行降阶，得到一阶阻抗模型。其次，基于一阶阻抗模型分析出影响负载变流器负阻尼特性的主导因素，进而推导出基于直流电压前馈的相位补偿控制策略，可在全频段将负载变流器阻抗校正为正阻尼特性，从而提高直流配电系统的稳定性。最后，以三端直流配电系统为例，通过Simulink仿真和StarSim硬件在环实验，验证了所提控制策略的有效性。 |
| 关键词: 多端直流配电系统 电压源型变流器 相位补偿 稳定性分析 |
| DOI：10.19783/j.cnki.pspc.240420 |
| 投稿时间：2024-04-09修订日期：2024-10-30 |
| 基金项目:国家自然科学基金项目资助(52377167) |
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| Phase compensation control strategy for load converters in multi-terminal DC distribution system |
| TANG Xin,QU Bei,ZHANG Ruining,LI Xiaomeng,LI Zhen |
| (State Key Laboratory of Disaster Prevention & Reduction for Power Grid (Changsha University of
Science & Technology), Changsha 410114, China) |
| Abstract: |
| In multi-terminal DC distribution systems, the system damping is reduced by the constant power characteristics of the load converters with constant power control, which can easily cause DC voltage and current oscillations, leading to system instability. Therefore, a phase compensation control strategy based on DC voltage feedforward is proposed. Firstly, the DC side impedance model of the load converter is established, and is reduced to a first-order impedance model based on the continuous fraction theory. Secondly, based on the first-order impedance model, the main factors affecting the negative damping characteristics of the load converter are analyzed, and a phase compensation control strategy based on DC voltage feedforward is proposed. The strategy can correct the load converter impedance to positive damping characteristic across the entire frequency range, thereby improving the stability of the DC distribution system. Finally, taking a three-terminal DC distribution system as an example, the effectiveness of the proposed control strategy is verified through Simulink simulation and hardware-in-the-loop experiment on StarSim. |
| Key words: multi-terminal DC distribution system voltage source converter phase compensation stability analysis |
