考虑大规模风电接入的电力系统备用容量评估方法

A Reserve Capacity Evaluation Method Considering Large-scale Wind Power Integration

风电作为清洁能源是减排的重要资源,其装机容量正在飞速发展。然而,由于风电固有的间歇性和波动性,大规模风电并网对电力系统的安全稳定运行带来了不确定因素。为了保证系统安全稳定运行,需要重新评估系统备用容量能否抵御风电功率随机性给系统带来的运行风险。因此,本文针对大规模风电接入后的电力系统备用容量评估方法进行研究,考虑了发电机组强迫停运概率、风电出力随机特性和可靠性指标,通过基于随机生产模拟的备用容量计算方法,建立备用容量与可靠性之间的关系;进一步建立了基于风电场等效多状态机组模型,对风电接入后系统所需的备用容量进行计算。通过对中国某实际区域电网的仿真计算验证了该方法的正确性和有效性。

As a clean energy source,wind power is an important resource for emission reduction,and the installed capacities are growing rapidly.However,due to the inherent intermittency and volatility of wind power,large-scale wind power integration has brought uncertainties to the secure and stable operation of power system,and it is necessary to re-evaluate whether the reserve capacity of the power system can withstand the operation risk brought by the randomness of wind power.In this paper,the power system reserve capacity evaluation method after the large-scale wind power integration is studied.The forced outage probability of generator units,the random characteristics of wind power output and the reliability index are considered,and the relationship between the reserve capacity and the reliability is established by the reserve capacity calculation method based on stochastic production simulation.An equivalent multi-state unit model is further established to calculate the reserve capacity required by the power system after wind power integration.The method is verified by the simulation calculation of an actual regional power grid in China.