Research On Improved Droop Control And Harmonic Suppression Of Micro Grid

Energy, in the human social development and progress plays a vital role. People long ago realized that the disadvantages of traditional fossil energy, such as limited resources, environmental pollution and other defects. But suffer from the need of social development as well as the restriction of backward technology makes people have to fossil energy as the main energy structure. In recent years, with the rapid development of science and technology, how to effectively use of renewable energy power generation has become the object of concern in many countries. Micro power grid because its has a unique advantage in the use of new energy, has been more and more research and development. This article mainly aims at the droop control strategy of the micro grid and its two aspects of harmonic suppression question for study.Traditional droop control strategy cause itself to meet the accurate distribution of the power requirements, this paper mainly aiming at the shortcomings of the traditional droop control, in the traditional droop control the link of power calculation is introduced into a feedback loop, eliminate the influence of voltage change on the system power split, finally met the precise allocation system active and reactive power requirements.Previous harmonic suppression system is generally through the system detection for harmonic content in the system and corresponding harmonic frequency is obtained by active filter unit but in the opposite direction of harmonic signal to offset the harmonic wave of output voltage and current. This paper embarks from the internal system, according to the superposition theorem in the basic of the original, on the basis of improved droop control of a harmonic domain droop control strategy, finally through every harmonic controller output signal and fundamental domain prolapse controller output signal superposition for inverter input signal. This method from harmonic source in order to reduce the system harmonic content, effectively reduce the use of filter equipment, improve the efficiency of the system, and increase the response speed of the system, to a certain extent, to reduce the harmonic THD has certain significance.