供电距离对含水光配电网孤岛初期稳定性的影响研究

Study on the Influence of Power Supply Distance on Islanding Initial Stability of Hydropower-Photovoltaic Distribution Network

随着“双碳”建设目标的提出,水力发电,光伏发电等清洁低碳、可循环利用的能源受到广泛的关注。当前,广东山区配网中小水电、光伏发电占比大幅提升,在提高本地供电可靠性的同时,对配网电能质量的影响也日益严重。以新能源为主体的低碳新型电力系统为研究对象,分析小水电、光伏发电并网的运行特性,开展不同供电距离对水光配网孤岛初期稳定性的影响研究。基于Matlab平台搭建水光并网模型,仿真分析电源侧不同供电距离对水光配网孤岛初期频率的影响。结果表明,水轮机组供电距离处于一定范围内时,呈现距离越远,频率峰值越大、稳定频率越高的趋势,而光伏供电距离对水光配网孤岛稳定性影响相对较弱。

With the"double carbon"construction goal proposed,hydropower,photovoltaic power generation and other clean low-carbon,recyclable energy have attracted extensive attention.At present,the proportion of small-sized hydropower and photovoltaic power generation in the mountainous power distribution network of Guangdong Province has increased significantly.While improving the reliability of local power supply,the impact on the power quality of distribution network is becoming more and more serious.The new low-carbon power system with new energy as the main body is the research object of this paper.Firstly,the paper analyzes the operation characteristics of grid-connected small hydropower and photovoltaic power generation,and then studies the impact of power supply distance on the islanding initial stability of the hydropower and photovoltaic power distribution network.Finally,based on MATLAB platform,the paper builds the hydropower and photovoltaic power grid-connection model,and analyzes by simulation the influence of different power supply distances at the power supply side on the islanding initial frequency of the hydropower and photovoltaic power distribution network.The results show that when the power supply distance of water turbine unit is in a certain range,the farther the power supply distance is,the higher the frequency peak value and the higher the stable frequency,while the effect of photovoltaic power supply distance on the islanding stability of the hydropower and photovoltaic power distribution network is relatively weaker.