对单机单负荷系统，发电机原动机频率特性与负荷频率特性的交点A为系统初始

For a single-machine single-load system, the intersection point A of the generator's prime mover frequency characteristic and the load frequency characteristic is the initial operating state of the system. At this time, the corresponding frequency is, indicating that the power output of the generator and the active power demand of the load channel have reached a balanced state. At this time, if the load increases and the load curve becomes, due to the increase of the system charging load, the output power of the generator cannot be adjusted in time to match the load demand, resulting in a decrease in the generator's transfer demand and a decrease in the system frequency. But at this time, the generator governor starts to perform a frequency adjustment to increase the generator frequency. When it is close to the load frequency, it oscillates slightly, and finally reaches a new equilibrium point, that is, point B in the figure. In a frequency modulation process, the amount of change in frequency is

For a single-machine single-load system, the intersection A of the generator's primary motivation frequency characteristics and load frequency characteristics is the initial operating state of the system, at which point the corresponding frequency is, indicating that the power output of the generator is balanced with the active demand of the load ditch. At this time, if the load increase load curve becomes, due to the increase of the system load, the output power of the generator can not be adjusted in time to match the load demand, resulting in a decrease in the generator transfer, the frequency of the system is reduced. However, at this time the generator regulator began to perform an FM, so that the generator frequency rises, near the load frequency to make a small oscillation, and finally reached a new equilibrium point, that is, the gap B point in the figure. During an FM, the amount of frequency change is

For a single machine single load system, the intersection a of the frequency characteristics of the generator prime mover and the load frequency characteristics is the initial operation state of the system. At this time, the corresponding frequency is, which indicates that the power output of the generator and the active power demand of the load channel reach the balance state. At this time, if the load curve changes to, due to the increase of the charging load, the output power of the generator can not be adjusted in time to match the load demand, resulting in the decrease of the generator demand and the decrease of the system frequency. But at this time, the generator governor starts to conduct a frequency modulation, which makes the generator frequency rise. When it is close to the load frequency, it oscillates slightly, and finally reaches a new equilibrium point, that is, point B in the figure. In the process of primary frequency modulation, the change of frequency is<br>