Control Strategy Of Hybrid Micro Grid Interlinking Converter Based On ADRC

The application of IOT,big data,mobile Internet,cloud computing and other new generation of information technology in forest areas has promoted the traditional forestry to "smart forestry",which has led to the rapid growth of the number and types of electrical equipment in forest areas.However,the forest area is generally located in remote areas.There are many problems in the traditional large power grid,such as the difficulty of line erection and high investment cost,which make the power shortage in the forest area.According to the characteristics of renewable energy and load diversity in forest areas,the construction of AC-DC hybrid micro grid can make full use of local energy to better guarantee the power demand in forest areas.For the independent hybrid micro grid built in forest area,the distributed power sources in the AC /DC sub network are mostly distributed power sources and energy storage units based on the interface of power electronic devices.The inertia time constant of the system is small,and the capacity of the micro grid in forest area is generally small in consideration of economic benefits,which makes its stable operation greatly affected by load switching.In case of random switching of high-power load in the AC or DC sub network,the frequency or voltage of the AC sub network will deviate from the allowable working range,and in serious cases,the whole micro grid will not operate stably due to the power imbalance of the system.As the key equipment to coordinate the power flow of the AC / DC sub network,the interconnected converter connected with the AC / DC sub network bus can play a role in stabilizing the micro network system.The design of its control strategy is very important,which is the key to solve the above problems.Therefore,this paper proposes a control strategy of hybrid micro grid interconnection converter based on ADRC to ensure that the forest micro grid can always maintain stable operation under the condition of random switching of high-power load.The main work and innovation achievements are as follows:(1)In view of the problem of power shortage in remote forest areas,combined with the characteristics of forest load and power diversity,the independent hybrid micro grid topology suitable for forest areas is determined,and the corresponding detailed mathematical models of AC sub network,DC sub network and interconnected converter are established.(2)In order to solve the problem of AC subnet frequency or DC subnet bus voltage offset caused by random switching of high-power load,the linear relationship between AC subnet frequency,DC subnet bus voltage and active power flowing through the interconnected converter is established throughderivation,and the active power coordination control strategy of the interconnected converter is designed to realize the complementation of active power between AC subnet and DC subnet,So as to achieve the control goal of reducing the frequency of AC sub network or the voltage deviation of DC sub network bus.(3)In view of the instability of hybrid micro grid in forest area caused by high-power load switching,a control strategy of hybrid micro grid interconnected converter based on ADRC is proposed,which is based on the better anti-interference characteristics of ADRC controller,taking into account the ultimate bearing capacity of distributed power in AC and DC sub networks,so that the micro grid can still operate stably in the case of random switching of high-power load ?...