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This paper proposes a new approach for detection of underground tunnels. The proposed system is able to detect stationary and moving underground metal objects and as a result to detect tunnels. The detection system is implemented by underground installing of two parallel rows of electrically conductive rods. These rods are electrically isolated and exposed only at the lower edges. AC current is supplied...
When a three-phase power line connected to unbalanced loads, its terminal voltages and line currents become also unbalanced. The most unfavorable load for three phase network or stand-alone generator is a single-phase load. Present study suggests a novel method for operating single-phase load connected to three-phase network while keeping generator voltages and currents fully symmetrical. Theoretical,...
The smart grid a new generation of standard power distribution grid. The communication infrastructure is critical for the successful operation of the modern smart grids. The use of communication technologies ensures the reduction of energy consumption, optimal operation of the smart grid and coordination between all smart grids' components from generation to the end users. This paper presents an overview...
The paper proposes new improved MPPT measurement method based on the conventional Fractional Open Circuit Voltage (FOCV) method, where the maximum power point voltage is estimated by continuous measuring of PV panel's open circuit voltage and calculation of the voltage factor. In the proposed Semi-Pilot Cell (SPC-FOCV) the measurements of the open circuit voltage are performed on one PV cell which...
The paper proposes an original DC-AC inverter that is based on combination of buck converter with standard three-level H-bridge inverter. This inverter uses simple feed-forward control in order to obtain almost sinusoidal output currents and voltages.
The paper presents an extended analysis of a hybrid 13-level inverter operated under different modulation methods and different conditions. The proposed approach can be extended to any desired number of levels. Extensive simulation results of the proposed inverter are presented. The simulations are validated by hardware-in-the-loop experimental results.
The paper proposes a new type of the synchronous AC machine operated on a principle of the electric field effect. The proposed machine has smaller size and lighter weight than the standard electromagnetic synchronous machines with the same rated parameters. Another important advantage is a simple structure of the machine, which simplifies the production process and reduces the costs of the motor....
The paper presents an analysis of multilevel inverter, which comprised of cascaded 5-level Flying Capacitor (FC) cell and standard 3-level H-bridge cells. The advantages of the proposed inverter upon standard topologies are significant reduction of electrical components and as a result, lower size and weight. Moreover, the proposed inverter has simplified control algorithm due to the reduction of...
The paper presents novel Phase Shifted PWM method for multi-level inverters operated in the over-modulation range. The proposed method is based on combination of Generic Phase Shifted PWM method with third harmonic injection method. The first significant advantage of the proposed method over the conventional Phase Disposition (PD) PWM is equal power flow between the H-bridges and almost equal distribution...
The paper proposes a new type of linear electrostatic motor operated on a principle of the electric field effect. The unique structure of the motor and the use of new dielectric materials with high electric permittivity significantly increase its generated force. The generated force is further increased by using several layers of capacitors. The proposed motor has advanced motion control options that...
The paper presents an original generic phase shifted (PS) PWM algorithm for a thirteen level cascaded H-bridge neutral point clamped inverter. According to the literature, the PSPWM was used only with cascaded 3-level H-bridges. The present algorithm could be used with any type of inverter, while the advantages of the conventional PSPWM algorithm are maintained. The generic PSPWM is applied in the...
We introduce a novel analytical approach to the evaluation of harmonic content in multi-level inverters. An analytical formula for the phase voltage total harmonic distortion (THD) of any multi-level pulse-width modulation (PWM) signal is introduced. As opposed to conventional THD expression where full spectral knowledge of the signal is required, the proposed formula depends only on fundamental amplitude,...
The study presents a series space vector modulation (SVM) method for multi-level cascaded H-bridge inverters. The proposed method is based on construction of multi-level reference voltage vectors from three-level voltage vectors, which are present in the space vector diagram of the multi-level inverter. The proposed approach is compared to the conventional SVM and the carrier-based pulse-width modulation...
The paper presents simulation results about thyristor operation of a mains connected induction machine, both as a motor and as a generator. The results were obtained by three different simulation packages, Simulink, Psim and Plecs. The cosimulation options between these programs were checked. The performances of these three packages were compared. The simulation results were validated by real experiments.
The paper presents thyristor operation of a mains connected induction generator. The stator of the generator is connected in three different configurations: ldquostarrdquo, ldquodeltardquo and ldquodelta with thyristors insiderdquo. The performance of the power controller is compared for these three configurations. The simulation results are validated by the experimental results.
The paper compares motor and generator modes of the thyristor operated induction machine. The stator of the machine is connected in three different configurations: ??star??, ??delta?? and ??delta with thyristors inside??. The motor and the generator modes are compared for these three configurations. The simulation results are validated by the experimental results.
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