含风光接入的微电网可靠性影响分析

Impact of wind and solar power grid connection on microgrid reliability

提高风光接入率有利于“碳达峰”“碳中和”目标的实现,但风电、光电的随机性会影响微电网可靠运行。通过可靠性分析环节可为风光友好接入微电网提供评估依据。建立了含随机性的风光输出功率模型,引入概率、频率及持续时间等指标分析了微电网的可靠性,研究了光伏模型中光伏输出功率的Beta分布参数(α和β)、风速和风光渗透率对系统可靠性的影响。结果表明,α和β可以影响光伏输出功率,进而影响系统可靠性水平;风速也是影响可靠性的因素之一,在避免因风速过大损坏风电机组的前提下,选择风力资源丰富区域开展风电接入有利于系统可靠性;当α=2.00,β=0.80时,在一定风光渗透率下,提高光伏发电所占比例可改善概率性指标和用户平均停电持续时间指标,但系统平均停电频率会持续增加。

Increasing the proportion of grid-connected wind and solar power is conducive to achieving the carbon peaking and carbon neutrality.However,the randomness of wind and solar power will affect the reliable operation of microgrid.The reliability analysis can provide an evaluation basis for the smooth access of wind and solar power to microgrid.Firstly,the model of the wind and solar power output considering the randomness is established.Then,probability,frequency,duration and other indicators are introduced to analyze the reliability of microgrid.Finally,the effects of Beta distribution parameters(αandβ),wind speed,wind and solar permeability on system reliability are studied.The results show that the Beta distribution parameters can affect the photovoltaic power output,and then affect the system reliability level.Wind speed is also one of the factors affecting reliability.On the premise of avoiding damage to wind turbines cause by excessive wind speed,getting wind power accessed into power grid from areas with rich wind resources is conducive to the system reliability.Whenα=2.00,β=0.80,increasing the proportion of photovoltaic power is beneficial to restraining the probability indexes and customer average interruption duration index(CAIDI),but will continue to increase the system average interruption frequency index(SAIFI).