论文标题
用于网格整合研究的可变速度水电建模
Modelling of Variable Speed Hydropower for Grid Integration Studies
论文作者
论文摘要
本文提出了一个基于欧拉涡轮方程的液压模型，适合于可变速度水电（VSHP）的网格整合研究。这项工作是由于需要评估水电工厂以可变速度运行时的动态性能如何改变的动机。 Euler模型认为水流依赖于涡轮机旋转速度，并将涡轮功率计算为水流，涡轮旋转速度和引导叶片开口的非线性功能。基于水道的1-D动量和连续性平衡，包括水道模型，以模拟水锤，质量振荡和隧道损失。这些详细且准确的模型对于识别液压系统中可能的局限性是必要的，以正确对涡轮机的功率和旋转速度进行建模，从而能够最大程度地提高功率输送以实现系统控制目的。所有Euler模型参数都可以从涡轮和水道的物理维度得出，从而确保容易实现。通过利用与penstock动力学的总参数相当，欧拉模型的状态空间表示近似。动态模拟和特征值分析表明，与常规水电模型相比，欧拉模型的强度。
This paper proposes a hydraulic model based on the Euler turbine equations suitable for the purpose of grid integration studies of variable speed hydropower (VSHP). The work was motivated by the need to assess how the dynamic performance might change when a hydropower plant is operated at variable speed. The Euler model considers the water flow dependency on the turbine rotational speed and calculates the turbine power as a non-linear function of water flow, turbine rotational speed and guide vane opening. A waterway model is included, based on the 1-D momentum and continuity balance for a water-filled elementary pipe to simulate water hammer, mass oscillation and tunnel losses. These detailed and accurate models are necessary for recognising possible limitations in the hydraulic system, to model the turbine power and rotational speed correctly and thereby to be able to maximise power delivery for system control purposes. All Euler model parameters can be derived from the physical dimensions of the turbine and waterway, ensuring easy implementation. State-space representation of the Euler model is approximated by utilising a lumped-parameter equivalent of the penstock dynamics. Dynamic simulations and eigenvalue analysis show the strength of the Euler model compared to conventional hydropower models.
