Abstract
In order to realize the uninterruptible power supply in the master-slave independent micro-grid system, the micro-grid inverter needs to realize the mode switching of the grid-connection/grid-disconnection. How to reduce the transient oscillation during switching, so as to effectively achieve seamless mode switching is a key issue to be solved. In this paper, a typical master-slave control independent micro-grid is used as an example, the strategy of mode switching is improved in two aspects. On the one hand, the state-following algorithm is adopted to improve the switching strategy of the outer loop. On the other hand, the current inner loop is taken by the H∞ robust controller to improve the robustness of the controller. Compared with the traditional PI control mode switching, this paper illustrates the feasibility of the proposed strategy through the simulation and experiment verification. The improvement strategy in this paper can effectively reduce the voltage and current oscillation during mode switching.
Highlights
With the problem of environmental pollution is more and more serious, new energy power generation has become a hot spot in various countries
Because the independent micro-grid system is independent of the large power grid, its stability is worse than the large power grid, so it is the hot topic of the current scholars[4]
In order to effectively realize the seamless mode switching of the inverter, this paper has improved in two aspects
Summary
With the problem of environmental pollution is more and more serious, new energy power generation has become a hot spot in various countries. How to ensure the critical loads in the independent micro-grid uninterrupted power supply, that is, to achieve the inverter grid-connection/griddisconnection seamless smooth mode switch, which is a challenge to study the independent micro-grid technology. [5] proposes an indirect current control algorithm for seamless transfer of three-phase utility-interactive voltage source inverters. [6] presents voltage magnitude and frequency control of a three-phase voltage source inverter to achieve a seamless transfer between grid-tied mode and intentional islanding mode. [9] proposes a phase-locked loop (PLL)-based seamless transfer control method between grid-connection and islanding modes in a three-phase grid-connection inverter. This paper improves the switching mode of the outer loop and proposes a kind of state-following switching strategy. The construction of the experiment platform and experiment verification is given in section VI Section VI gives the conclusions
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