Research On Reactive Compensator Considering The Problem Of Low Voltage Ride Through In Micro-grid

With the implementation of energy conservation policies, the development andutilization of new energy sources, micro-grid construction is imperative. Currently, micro-gridreactive power problems and low voltage ride through issues are highlighted, which havebecome a hot issue in the micro-grid electricity sector research. Implement power electronicstechnology and control technology to solve above problems, which have theoreticalsignificance and practical value. In this paper, a study for the reactive compensatorconsidering the problem of low voltage ride through in micro-grid.In order to effectively solve the lack of reactive power, harmonic interference andmicro-power low-voltage ride through problems of micro-grid, topology and workingprinciple were deeply studied of dynamic reactive power compensator, applying theinstantaneous power theory to the micro-grid, creating dynamic reactive power compensationmodel. Based on instantaneous power theory, combining the instantaneous reactive currentdetection method with harmonic current detection method. A improved current detectionmethod was proposed, which can simultaneously isolate the reactive current and harmoniccurrent by detecting line current, under the premise of hardware circuit structure unchangedand the same mounts of calculation, thus achieve a comprehensive compensation current inmicro-grid. For micro-grid fault resulting in low voltage ride through issues, reactive powercompensation device work in a state of inverter voltage adjustable by using thecomprehensive compensation detection for judgment on the micro-grid fault. It achieve thevoltage support of micro power grid-connected node and solve the problem of micro-powerlow-voltage ride through.Using the actual data of Liaoning University of Technology’s micro-grid system andMATLAB/simulink simulation platform to build a simulation model of this design of reactivepower compensation device, the simulation results show that the accuracy of the detectionmethod in this article, as well as effectiveness of reactive power compensation device, andprove that the application of reactive power compensation device to improve the feasibility ofmicro-power low-voltage ride-through capability.