响应电网调度需求的光伏发电系统建模及运行控制研究

摘要

针对现有光伏仿真模型无法执行电网调度指令的问题,提出响应电网调度需求的光伏发电系统建模及运行控制方法.根据不同容量光伏系统组成结构搭建了基于DIgSILENT的适用于不同容量的并网光伏发电系统模型,以光伏发电系统响应电网有功需求时间最小化为期望目标,考虑光伏发电系统出力的随机性,通过调整直流电压控制信号响应电网调度需求,利用控制模块中的有功出力限制满足并网点频率约束条件,采用电导增量法优化了MPPT控制策略.仿真结果表明,在有电网调度需求时构建的模型能够快速地响应电网调度指令,在无调度需求时能够很好地实现最大功率跟踪或限制有功出力以满足并网点频率约束.%Aiming at the problem of the lack of executing power grid dispatching instruction in the existing photovoltaic (PV) simulation model, the method of the modeling and operation control of photovoltaic generation system on response to grid dispatching requirements was proposed. According to the composition structure of PV system with different capacity, the simulation model of grid connected PV generation system with different capacity based on DIgSILENT was built. The aim was to minimum the response?time of photovoltaic generation system in response to grid active demand considering the randomness of the photovoltaic generation system output. The demand of power grid dispatching was responded by adjusting the DC voltage control signal. The condition of the frequency constraint of power grid connected point is satisfied by the active power output limit module. The MPPT control strategy was optimized by the conductance increment method. The simulation results show that the constructed model could quickly respond to the power grid dispatching order, while without the demand of power grid dispatching, the model could achieve the maximum power tracking or limit active power output to meet the frequency constraint condition.