大规模风电接入对电力系统暂态稳定风险的影响研究

大规模风电接入电网可能影响电网运行状态,造成系统暂态稳定特性改变,量化大规模风电接入对电力系统暂态稳定风险的影响,是保证风电消纳和电网安全的重要课题。在研究系统暂态稳定性分析中的风电模型和电网故障严重程度的基础上,提出一种评估大规模风电接入的电力系统暂态稳定风险评估方法。该方法充分计及风电出力与系统故障状态的随机性,并基于效用理论,以调度员对功角偏差的感知效用为度量指标,建立用非线性效用函数量化故障的严重程度,同时对系统暂态稳定风险指标的计算方法与流程进行了详细研究。将该方法应用于新英格兰39节点系统,对比研究了不同并网容量和并网点对暂态稳定风险的影响,仿真结果证明了所提方法的正确性和有效性。

Study on the influence of large-scale wind power integration onpower system transient stability risk

The integration of large-scale wind farms would influence the operation status of power system, which re-sults in the change of transient stability characteristic, so that it is very important to quantify the impact of wind farms for ensuring the wind power using and power system security. The power system transient stability risk assessment method considering large-scale wind farms is proposed in this paper based on the research of wind power model and grid failure severity. Based on the full consideration of the randomness of wind farm outputs and system failure states, the method employs the utility theory and takes the perceived utility of operator to relative angle deviation as the meas-ure index, and then, the nonlinear utility function is constructed to quantify the fault severity. Furthermore, the cal-culation method and flow chart of power system transient stability index are also provided in detail. This method is ap-plied to the New England 39-bus system, and the effect of different integration capacities and different integration points on system transient stability risk value is investigated. The simulation results show the effectiveness and correct-ness of the proposed method.