Control Strategy Design Of Active Power Balance In Microgrid Based On Renewable Generation

With the energy shortages and environmental problems becoming increasingly serious, renewable energy technology has got the attention of the countries all over the world. Solar power and wind power no doubt are the most potential kinds of renewable energy technology among renewable energy. However, they will bring many poor effects and restrictions of the application when they connect to the power grid. Microgrid technology can be a very good solution to overcome the adverse impacts when the renewable energy access electric network. Microgrid technology as a frontier research area is the most hot research spot in the world. Considering the limitations and difficulties in building the experiment Microgrid system, in this article, we use software named Matlab to construct the Microgrid model to study the renewable energy parallel operation in power system and some issues about the automation and intelligent control in Microgrid.1. Microgrid simulation platform was established firstly in this paper. Based on the photovoltaic mathematical model, we apply the simulation software to build general engineering photovoltaic simulation model. In order to control the photovoltaic system, we choose the perturbation and observation method. Cause of the perturbation and observation method, the photovoltaic cell can track the maximum power point.According to the wind power characteristic curve, the wind machine model and wind turbine model is built in this paper. Wind generator is the permanent magnet synchronous generator simulation model. According to the energy storage battery charging and discharging characteristics and comparing several different storage battery models, a general engineering battery model is constructed.Studying the inverter control strategy named Droop strategy in a Microgrid. In this paper, the structure and characteristics of the controllers are shown following with the simulation analysis, which has the important meaning especially to the island operation control in a Microgrid.2. In this paper, power flow in a Microgrid is draw. Considering the wind speed and light intensity are intermittent, a suitable energy management strategy is put forward. Analyzes the AC Coupled Microgrid structure. For each distribution generation, a micro power controller is designed. Wind system and solar system use PQ control strategy. Battery energy storage adopts v/f control strategy. With referring the result of DC Coupled Microgrid simulation analysis, AC Coupled Microgrid is analyzed.3. The DC Coupled Microgrid simulation model is established. According to the DC Microgrid operation characteristics, the controllers in DC Coupled Microgrid are designed. Photovoltaic module uses constant voltage control; wind system controller use PQ control strategy; battery’s duty is to maintain the stability of the DC public bus voltage.