Fuzzy Theory Based Grid-Connected Power Control of Microgrid Containing Photovoltaic System
Randomness and fluctuation of renewable energy resources such as wind farm and photovoltaic (PV) generation included in grid-connected microgrid bring negative influence to power grid. For this reason, a fuzzy theory based control method, in which the output of distributed generation systems is used to smooth the power in tie line connecting microgrid with power grid, is proposed. Taking a system composed of PV generation and diesel generator as example, a theoretical control model is established, in which the intensity of illumination and the power difference of the tie line are regarded as input variables of fuzzy operation and through the fuzzy modeling a PWM control waveform is output, which controls the active power of PV inverter. Thus the output of PV system transmitted to load is controlled. Simulation results show that the exchanged power in the tie line can be effectively suppressed, and it means that the employment of energy storage devices is somewhat decreased, so the utilization of renewable energy sources can be ensured. Therefore, when the microgrid is connected to power grid the power impact from microgrid to power grid can be controlled within a lighter extent.
microgridphotovoltaic-diesel hybrid power systemtie-line power flow controlfuzzy control
国家科技期刊平台
NSTL
万方数据
维普
