| 引用本文: | 张 澳,王鑫达,张学广.弱电网下VSG-DFIG暂态功角稳定性分析及优化策略[J].电力系统保护与控制,2024,52(22):73-81. |
| ZHANG Ao,WANG Xinda,ZHANG Xueguang.Transient power angle stability analysis and optimization strategy of a VSG-DFIG in a weak power grid[J].Power System Protection and Control,2024,52(22):73-81 |
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| 摘要: |
| 电压源型双馈风电机组通过采用虚拟同步机控制这种典型的构网型控制方式，可以为电网提供一定的阻尼与惯性，而在电网发生电压跌落故障时，其可能会出现与同步机相似的功角稳定问题。首先，借助等面积定则分析电网电压发生三相对称跌落时，网侧转差功率与变功率给定值对暂态功角稳定性的影响。同时为使变功率给定控制策略在暂态期间适应网侧变流器动态变化，提出了一种基于暂态功角前馈的虚拟同步机控制双馈风电机组稳定性优化方法。将功角偏差量通过前馈的方式补偿暂态过程中虚拟同步机的不平衡转矩，加速功角越过暂态期间平衡点后的减速过程。通过暂态功角曲线的加减速面积确定前馈系数的选取范围，在保证功角收敛的情况下维持电压源型控制穿越故障。最后，通过仿真与硬件在环实验平台验证上述理论分析的正确性及优化方法的有效性。 |
| 关键词: 电压源型控制 双馈风电机组 虚拟同步机控制 等面积定则 暂态功角前馈 |
| DOI：10.19783/j.cnki.pspc.240426 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51977046) |
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| Transient power angle stability analysis and optimization strategy of a VSG-DFIG in a weak power grid |
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ZHANG Ao1, WANG Xinda2, ZHANG Xueguang1
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1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China;
2. State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute, Nanjing 211100, China
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| Abstract: |
| The voltage-source doubly-fed induction generator (DFIG), controlled by the typical grid-forming control method of a virtual synchronous generator (VSG), can provide damping and inertia to the power grid. However, during voltage dip faults, they may encounter similar power angle stability issues to those experienced by synchronous machines. First, the impact of grid-side converter power and variable power reference on transient power angle stability using the equal-area criterion when the grid voltage experiences a three-phase symmetrical voltage dip are analyzed. To adapt the variable power reference control strategy to the dynamic changes of the grid-side converter during the transient period, a stability optimization method for a VSG-controlled DFIG (VSG-DFIG) based on transient power angle feedforward is proposed. The method compensates for the imbalance torque of the VSG by feeding forward the power angle deviation, thus accelerating the deceleration process after the power angle passes the equilibrium point during the transient period. The selection range of the feedforward coefficient is determined by the acceleration and deceleration areas of the transient power angle curve, ensuring that the power angle converges while maintaining the fault ride-through capability of the voltage-source control. Finally, the correctness of the theoretical analysis and the effectiveness of the optimization method are verified through simulation and a hardware-in-the-loop experimental platform. |
| Key words: voltage-source control doubly-fed induction generator virtual synchronous generator control equal area criterion transient power angle feedforward |
