光伏发电容量可信度分析

Analysis on Capacity Credit of Photovoltaic Power Generation

随着光伏发电站大量接入电网、光伏发电容量在系统中的比例不断增大,光伏发电对系统的影响也随之增大。光伏发电站接入电网改变了电力系统的规划和备用容量,同时也为调度带来了困难。光伏发电对电力系统发电可靠性具有一定的贡献,如何衡量光伏发电的容量可信度是电力系统规划和评估光伏发电必须解决的关键问题之一。根据光伏发电容量可信度的定义,给出了几种光伏发电容量可信度评估方法,通过对不同比重和不同负荷特性下的光伏发电容量可信度分析,得出了光伏发电容量可信度的决定因素。对光伏电站接入电网的运行调度有一定的指导意义,同时为政府部门以及电力运行规划部门制定相关政策提供科学依据,具有重要的理论和工程实践价值。

With a lot of photovoltaic （PV） power stations connecting to the grid and the increasing proportion of PV power generation capacity in the system, the influence of PV power generation on the system is also increasing. Although PV power stations connected to the grid have changed the planning and spare capacity of power system, they also have aroused some difficulties for dispatching. PV power generation has made a certain contribution to the reliability of power system, and how to measure the capacity credit of PV power generation is one of the key issues which must be resolved by power system planning and the evaluation of PV power generation. According to the definition of the capacity credit of PV power generation, several kinds of assessment methods for the capacity credit of PV power generation are given. By analyzing the capacity credit of PV power generation with different gravity and different load characteristics, the determinants of the capacity credit of PV power generation are obtained, which has a certain guiding significance for the dispatching of PV power stations connecting to the grid. What＇s more, it can provide the government departments and the power operational planning departments with the scientific basis to formulate the relevant policies, which will be of great value to the theory and engineering practice.