Coordinated Control Of Power For Complementary Generation System Based On Wind-pv Renewable Energy

Wind-PV complementary generation system was the research object in this article. In view of supply power vacancy and bus voltage instability exist in power generation system, a coordination control strategy was proposed. The load and battery charge power demand can be satisfied by controlling maximum power output for the photovoltaic system and regulating power output for the wind system to track the insufficient required power. According to the characteristics of structure of complementary power generation system, the nonlinear mathematical model of wind power generation system, photovoltaic power generation system and battery charging system were established. The principle of each component of power generation system were introducedRobust coordination control strategy is used in the first place. The maximum power output of photovoltaic power generation system is realized through perturbance observation method. According to the inherent nonlinear characteristics of the wind power generation system, parameter changes in actual operation and uncertain factors caused by external disturbance, considering the characteristics of the bound of parameter changes is known, a robust coordinated controller is designed with the adoption of backstepping design theory and disturbance attenuation technology to achieve power balance of supply and demand in Wind-PV complementary power generation system. Theoretical analysis and simulation results show that the designed controller could achieve the expected power tracking of wind power generation system and has certain inhibitory effect on external interference.Secondly adaptive coordination control strategy is used. Given the unpredictability of the system parameter perburbations and the bound of parameter changes is unknown, through integrating adaptive backstepping design method, an adaptive controller is designed for the wind power generation system in order to realize the rapid compensation for the power output of photovoltaic power generation system and guarantee the dc bus voltage stable. Considering non-stable charging current of battery, a charging tracking controller is designed to track the expected charging current. The simulation results verify the feasibility of the adopted control strategy and the effectiveness of the designed controller.