集群风电虚拟机组时变概率模型及调度性能指标(二):调度性能指标

Time-varying Probabilistic Model and Dispatch Performance Indices for Wind Farm Cluster Virtual Power Generator—Part II: Dispatch Performance Indices

在高风电渗透率的刚性源端系统中,风电参与调度运行的模式需从负负荷向部分可控电源转变,而集群风电以虚拟机组(wind farm cluster virtual power generation unit,WCVPG)形式参与调度运行是提高风电可调度性的可行方案。该文作为系列文章的第2部分,基于文章第1部分建立的WCVPG时变概率模型,提出一种WCVPG调度特性与风险指标量化方法,为其以电源形式参与调度模型做出定量化的性能评价。首先,从可发功率、可发功率极限、出力调节范围和爬坡率四个方面提出WCVPG调度特性指标概率量化方法;然后,基于条件风险价值理论,提出WCVPG的安全性和经济性风险指标量化方法;进而,基于多状态概率分布基本运算,提出调度特性与风险指标计算方法;最后,基于实测数据比较了单个风电场与同一风电场公共连接点(point of common coupling,PCC)的风电场组合WCVPG调度特性指标和风险指标差异;分析了风电不确定性和波动性概率分布时变特性对WCVPG调度特性和风险指标的影响。

In the wind and thermal power transmitter system with high wind power penetration, the mode that wind power participate in dispatch should be changed from negative load to partly dispatchable power source. Taking wind farm cluster as a virtual power generation unit（WCVPG） to participate the dispatch is a potential way to increase wind power＇s dispatchability. As the second part of the paper, a quantitative method for WCVPG＇s dispatch characteristics and risk indices had been put forward based on the time-varying probability mode proposed in the first part of the paper. The indices provide the foundation to consider WCVPG as quasi power source in the dispatch model. Firstly, the dispatch characteristic indices have been proposed from four aspects： available power, available power limit, power output adjustable range and ramp rate limit. Then, based on the theory of Conditional Value at Risk, the quantitative methods for WCVPG＇s safe and economical risk indices have been proposed. Afterwards, based on the multi-state probability distribution, the calculation methods for dispatch characteristic and risk indices have been put forward. Finally, the dispatch characteristic and risk indices among wind farm, wind farm group and WCVPG has been compared. The influence of time-varying probability distribution of wind power＇s uncertainty and variability probabilistic distribution on the dispatch characteristic and risk indices of WCVPG has been analyzed.