Distributed energy frequency–voltage support technology

Abstract

With the development of distributed energy, the penetration rate of power electronic devices is increasing, and the dominance of thermal power generation will be slowly replaced by it. Synchronous generators, which are mainly thermal power generation, will also be slowly reduced with the development of new energy. It leads to the trend of power system with reduced inertia and weakened system strength, and the stability problem becomes serious. When the system is disturbed, the low inertia of the system will lead to power quality failure, which seriously affects the production as well as the life of the customer side. Therefore, in order to solve the power quality problem under the access of distributed energy with high penetration rate, this paper designs a distributed energy frequency–voltage support method. Firstly, the secondary frequency regulation of distributed energy is designed on the basis of the primary frequency regulation. Furthermore, for voltage support, this paper analyzes the quantitative relationship between voltage active and voltage reactive in the distribution network, and the voltage support is carried out to minimize network loss with the consideration of distributed energy inverters’ capacity characteristics and tidal current constraints. Finally, the effectiveness of the proposed strategy is verified through Matlab/simulink simulation.