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The paper reveals that while the equivalent circuit, representing the load side reflected low-frequency dynamics of a wind turbine generator, is similar to the electrical equivalent circuit of a photovoltaic generator, their dynamic resistances possess different behavior. While the incremental conductance of a photovoltaic generator does not change sign with terminal voltage variations, zero-crossing...
The research contains the analysis of distributive generation impact on active power losses in electric networks. Main attention was paid to renewable sources of energy, because their dependence on natural conditions is a determining factor in the process of selection of connection point to the grid and power of the source. The research suggests the technique of renewable source of energy stability...
There are two types of oscillation damping controller in power system which are power system stabilizer (PSS) and flexible ac transmission systems (FACTS). Numerous works have been carried out on the damping of power system low frequency oscillations. This paper addresses an extensive literature review on coordination problem in single-machine and multi-machine power system. It also reviews various...
Materials of this paper show possibility of realization of any nonlinear dependences between voltage and frequency (nonlinear V/F (Volt/Hertz) dependences) of the open-loop six-phase drive on the base of four inverters, controlled by specialized algorithms of space-vector modulation. Specific continuous and discontinuous schemes of modulation allow providing in this case symmetry of the phase voltage...
In this paper, the design procedure of a three-phase radial flux permanent magnet synchronous generator (PMSG) is presented for a wind turbine application. This generator is intended for direct coupling to a wind turbine. Low coercive force AlNiCo permanent magnet (PM) material is used in place of common and costly NdFeB PMs. The low coercive force of AlNiCo PMs may result in demagnetization of the...
It is being suggested a method of static power quality factors' standard values formation, such as voltage unbalance factors on negative and zero sequences of three-phase voltages, and voltage deviation of the positive sequence. The formation of the above mentioned factors is being fulfilled in two stages. At first, with use of the digital-to-analog method it is being formed three three-phase voltages...
New method for determination of parameters of the reactive compensator elements with a delta connection has been proposed that allows to calculate them regardless of the calculation of compensator elements with a star connection. The method is intended for calculation of the reactive compensator parameters of the hybrid shunt filter for discrete linear model of load that randomly varies. As an example...
Processes in the power scheme double-bridge series resonant converter are considered. The equivalent circuit of the converter based on the imposition of linear active resonant contours with sources of rectangular form voltage is applied to the analysis of processes. The expressions for the discrete the control-to-output-envelope transfer functions of the active resonant contour and of the resonant...
Issues related to fault-loop impedance measurement in a three-terminal power line for a fault locator associated with current differential relays are presented. The measurement is carried out for three hypothetical faults located at particular line sections and then the result consistent with the real fault is selected. In this way an influence of fault path resistance on the measurement is compensated...
Dependence of stator current from slipping for induction motor powered by a pulsed voltage source was analyzed. Slipping dependence for higher harmonic components of induction motor from the fundamental and carrier signals frequency was considered. A method for calculating the stator current of the induction motor by a predetermined supply voltage was proposed.
A possibility of application of power harmonic analysis method to an electrohydraulic complex with nonlinear processes in the pipeline system is demonstrated. It is determined that nonlinear processes in a hydraulic network, caused by cavitation self-oscillations, result in periodical stationary oscillations of power, are accompanied by increase of its variable component. To assess the processes of...
In the southern part of Ukraine, the increasing of the installed capacity of the solar power plants (SPP) effects on load-frequency control in the interconnected power system (IPS) of Ukraine. In order to mitigate power flow fluctuations due to the stochastic generation of SPP, the local active power controller (LAPC) is proposed. LAPC generates a control signal to the units of the regulating power...
The paper presents the study of a process's calculation in circuits with incommensurable frequencies. In such circuits the analysis of processes is realized by the use of an additional independent variable. Definitions of RMS currents, voltages and active power are introduced on the base of double integrals. Calculations of an active power in circuits with two independent voltage sources and a single-phase...
Natural gas distribution companies have different consumer types including manufacturing industry, organized industrial zones, food and beverage industry, household and other low consuming enterprises, etc. Leading two categories of these consumers are household and low consuming enterprises as they have high consumption in winter whereas low in summer. The paper studies consumption demand forecasting...
Some aspects of simulation of the energy systems for full-scale mode simulator, staff training and teaching in order to develop its skills of complex accidents rapid elimination at the Ukrainian power supply systems are considered.
The opportunity to clarify the methods of calculation and regulation of technological power losses by applying iterative method based integrated model state 0.4–35kV wire transmission lines is presented. The method of determining the model parameters and calculation results is presented too. The area of further research is identified.
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