A matrix NxM multi phase converter is a very simple structure incorporating NxM bi-directional switches, able to convert input voltages into output voltages of any shape and frequency. However, commutation problems and complicated control algorithms keep it from being utilized on a large scale. This paper shows a new field of application of the matrix converter, witch is working as a connection device between or as an interconnection device within power system. The task performed by this connection is a control of power flow and power flow oscillations dumping. The device can be viewed as new FACS device, based on straight forward energy conversion.

The paper analyses the effectiveness of the human protection against electric shock in circuits fed from the generator, especially from the backup generation set. Several protection devices of different characteristics were tested in laboratory and new approach to the protection was proposed in TN type wiring (earthed neutral point arrangement). This happened due to the fact that measurements showed that actually used devices do not satisfy protection criteria when full power of the generator is used. This criteria include time criterion - the maximum time of the occurrence of touching overvoltage can occur in less than 0.4 s time period. The proposal include new approach to the short circuit detection, where not only current but also voltage sensing is used. For a IT wiring (system insulated from the ground) “0” symmetrical component sensing an insulation testing devices are proposed.

A matrix NxM Multiphase Converter (MC) is a very simple structure incorporating NxM bi-directional switches, connecting N input phases to M output phases and able to convert input voltages into output voltages of any shape and frequency. However, commutation problems and complicated control algorithms keep it from being utilized on a large scale. This paper shows a new application field for multiphase matrix converters and its practical realization. Practical applications of multiphase matrix converter in power system require the study of application requirements, possible converter topologies and the development of new, reliable control algorithms. The MC is working as a connection device between power systems or as an interconnection device within the power system. The proposed tasks performed by the MC in power system are power flow control and power flow oscillations dumping. The device can be viewed as new FACS device- series power system connector, based on straight forward energy conversion.

This paper investigates a new concept of a voltage phase controller for power systems. The proposed device consists of two transformers with a 3-phase input and an N-phase output and an NtimesN matrix converter between them. The device is considered to control power flow control though a transmission line, when voltage phase shifts occur in the power system. Two special control strategies of matrix converter are described and tested by elementary simulations for an idealized 12times12 matrix converter. Results of numerical tests allow to choose a proper control strategy of the matrix converter.

The paper shows a new control strategy for the matrix converter, witch can be applied to the multiphase device. Multiphase converters (12 x12 structures) do not require costly and non effective filters and show much better over all performance than three phase ones, thus they can be utilized on a large scale. The task to be carried out by the MC, is to transform an N-phase, symmetric system of voltages of certain frequency to the N-phase symmetric system of voltages with different frequency and shifted by an arbitrary initial angle. The research includes detailed development of the converter's control procedure and its initial evaluation and describes the properties of the MC working under proposed algorithm. The evaluation of the proposed procedure is done using Matlab Simulink programming.