Design Of Control Algorithm Model And Logical Node Based On The Micro Grid Interconnection Converter

With the development and mature of the power electronic technology, the distributedpower technology, and the micro grid technology, the research of the micro grid emergeincreasingly, such as power supply quality, control technology, energy dispatching of themicro grid. The research of micro grid power supply reliability and flexibility mainlyconcentrated in the micro grid control problem of distributed power converter, in which thecontrol strategy and the control algorithm become the key to the study. At the same time, withthe expanding of IEC61850standard in the fields of application, the interoperability of thepower electronic devices and controllers in the micro grid are more and more becoming adevelopment need. The information communication technology combined with the micro gridtechnology, for the exploration and construction of smart grid, is of great significance. Basedon the micro grid interconnection instance, combining with IEC61850standard, the controlalgorithm were studied in this paper. The full text content can be divided into two parts:(1) Information modeling and design of logical nodes are important basis and necessarypremise of realizing equipment interoperability. This paper analyzed three common controlstrategies of converter and the design process of PQ control algorithm and design of thecurrent control loop based on the micro grid interconnection, drew a information interactionmodel of the control algorithm. The function logical nodes FPID, FSPT, and the arithmeticlogical nodes FOPE0, FOPE1, FOPE2, and the switching phase logical nodes FABD, FDQAin the model were designed concretely, logical node design were consisted of the design ofinput/output ports and algorithm implementation diagram within the logical node, and alllogical nodes in the model which are interconnected were designed for instantiation. Then,software phase-locked loop module, current control loop module, power control module weredesigned, and the relationship between the modules and those logical nodes were analyzed.Finally, the paper build a PQ control simulation model in the MATLAB/SIMULINK platformand verified the function of the voltage phase-locked, current tracking, active/reactive powerfollowing by simulation, and pointing out the relationship between simulation waveform andthe logical nodes.(2) The logical node designs can be applied to other instances. According to the designmethod of the logical nodes, taking substation bus couple bay interlocking for example,combined with the IEC61499standard, a kind of logical function block based on IEC61850/61499was designed through the concrete mapping between IEC61850model and IEC61499model, realizing the interoperability, the configurability and the reusability of the logical function block. The paper mainly introduced interlocking logical function blockCILO_FB, and control logical function block CSWI_FB, the state machines and thealgorithms within the logical function block were designed and the function blocks werevalidated, which is beneficial to the design of the whole bus couple bay interlocking system.Finally, the whole interlocking system was designed on the FBDK platform and thesimulation verified the correctness of the system.