| Popis: |
This paper presents dispatching methods of load frequency control (LFC) signals by use of photovoltaic (PV) in order to compensate short period power fluctuations in power systems. Large penetration of PV may take the place of thermal plant outputs, and the adjusting force of power grid becomes smaller. That makes it difficult to match the supply and demand. As a countermeasure for the problem, PV outputs are not only limited constantly but also controlled by sending signals using bidirectional communication systems in order to enhance the effect of frequency fluctuation compensation by limitation of PVs. Maximum PV outputs at a certain moment are different from each installation location because irradiation is different from each location. If LFC signals are sent to many PVs and are dispatched equally, some PVs can be controlled according to signals because their available maximum outputs are large, but others can not be controlled fully because their available maximum outputs are small. Then, the difference between total signals and total controlled PV outputs may become large. In this paper, LFC signal dispatching methods to many PVs are proposed. In the methods, a central controller obtains available maximum PV outputs at each installation location and dispatches LFC signals according to available control margins of each PV. The simulation results show better performance of LFC with proposed methods than equal signal dispatching. |
