Modified vector control appropriate for synthesis of all-purpose controller for grid-connected converters

Vector control and its application in power electronic converters, specifically grid connected inverters and rectifiers is well known topic. Numerous books and articles covered many of its problems and features, but mostly in theoretical way, without taking into account limited computing resources of converter control system, real-life system parameters which can differ from the simplified models used in theoretical analysis and appearance of new parameters as a consequence of concatenating converter with other converters, filters, transformers and other elements. Implementation of vector control in real-life converter is therefore not as straightforward as it may seem. Advanced filter and compensation elements can be hard to implement in a DSP system on one hand and simplified control structures can lead to unstable system or one that does not fulfil necessary requirements on the other hand. This article shows several modifications to simple voltage oriented vector control in threephase grid connected inverter which handles problems which occur due to connection of transformer between the grid and the converter, but also shows that modifications which have been carried out lead to universally applicable vector control system for grid connected converters.