Synchronized Output Regulation Of Network System And Its Application In Microgrid

The network system is an abstraction of the physical phenomena of various multi-nodes in the real world.With the development of network system theory itself,more and more physical phenomena and working patterns can be described in the network in modern production and life,such as robot cooperative control,hybrid micro-grid distributed control,vehicle formation and so on.Synchronized output regulation can be understood as an extension of the output regulation theory in the network,and it aims at making the final synchronization trajectory of each node in the network reach a given reference signal.With the complexity of the various conditions,higher requirements are put forward for synchronized output regulation algorithm under network system.In this paper,after the deeply study of network system synchronized output regulation the-ory,from two different perspectives,we proposed the H∞ output regulation algorithm aiming at dealing with the un-modeled noises and repetitive control based synchronized output regulation algorithm aiming at tracking periodic references.And then,we applied the synchronized output regulation theory on the control of AC and DC microgrid,by hardware platform or hardware in loop simulation.The main contents of this paper are as follows:1.In the classical output regulation algorithm,no matter what kind of controller we use(feedforward or internal model controller),the reference being tracked or the disturbance being rejected should be modeled.However,in practice,many kind of noises can not be modeled.We proposed an output regulation algorithm based on the H∞ theory.By the proposed algorithm,the plant is able to not only track or reject modeled signals but also suppress un-modeled noises.For the convenience of practical use,the result are given in the LMI form.2.In the AC microgrid,with the increase in the proportion of new energy generation nodes,its frequently switching characteristics put higher requirement to the seamless transfer algorithm of the grid-connected inverters.In this paper,we proposed a seamless transfer control algorithm based on the synchronized output regulation,where the inverter and the utility are treated as two nodes in the network.3.The essential and necessary condition for the realization of the synchronized output reg-ulation is that every node contains the corresponding internal model of the reference signal.The dimension of the system matrix of the reference’s exo-system determines the dimension of the dis-tributed controller of every node.When the reference signal is a periodical one with high system dimensions,it may be troublesome for the the controller’s realization.We proposed a synchronized output regulation algorithm based on repetitive control theory,and it can effectively for a variety of fixed period reference signal to achieve synchronized output regulation.In the stability analysis,we divide the system via the node-edge viewpoint.4.In the DC microgrid,the switching of the converters and loads puts challenges to the con-ventional stability analysis of DC microgrids.Based on the "node-dynamical edge" division,the DC microgrid is divided as converter nodes and electrical edges.According to the correspond-ing result of the passivity theory,we give the interface feedback passivation method for different converters.