计及火电阶梯式爬坡率的耦合系统相邻时刻有功可行域确定方法

Active Power Feasible Region Determination Method of Coupled System at Adjacent Moments Considering Ladder-type Ramp Rate of Thermal Power Units

经同一并网点耦合集成为统一运营主体的火电与新能源耦合系统在我国北方电网中普遍存在,其有功功率调节能力的确定是耦合系统整体参与电网运行的关键。该文首先考虑耦合系统功率调节的时序状态依赖性,提出相邻时刻有功可行域的概念,再计及火电机组阶梯式爬坡约束,推导出单台火电机组的相邻时刻有功可行域;其次,定义缩放和平移两种相邻时刻有功可行域的集合运算规则,并根据定义的运算规则,构建出火电扩容、新能源与火电耦合以及多火电机组耦合场景下的相邻时刻有功可行域。此外,以辽宁某局域电网火电机组的实际运行数据证明,该文推导的耦合系统相邻时刻有功可行域与实际情况相符。

Incorporation of the thermal power generation and renewable generation at the point of common coupling(PCC)as a unified operation entity is common in power grids of Northern China.Its active power regulation capability is important for the efficient operation of the coupled system.First,based on the time-series state dependence of the power regulation in a coupled system,this paper proposes the concept of the active power feasible region at the adjacent moment for the coupled system.Then,the active power feasible region of a single thermal power unit at adjacent moments is derived considering the stepped ramp rate constraint of the thermal power unit.Secondly,the feasible region of active power at adjacent moments,for the scenarios of coupled renewable energy and thermal power,coupled thermal power units,and thermal power expansion,is constructed with the help of new-defined operation rules for zooming and shifting the feasible regions of active power at two adjacent moments.In addition,the actual operation data in a local power grid in Liaoning shows that the active power feasible region of thermal power units at adjacent moments is consistent with the actual coupled system.