Abstract
is shown that the principle of control and voltage supply of the hybrid DC contactor network is realized by connecting the electronic circuit with one terminal between two counter-actuated power-operated semiconductor devices of the two-way key, which shunts the main contacts of the first pole of the contactor, and the second terminal Luce. As a result, the network voltage is fed to the electronic circuit only for a short period of time (several ms), which is determined by the value of the time flow of the load current through the shunted bidirectional NC under the disconnected load. The features of the process of current flowing from the main contacts to the circuits of switching on and off power controlled devices and the charge of the switching capacitor are determined. It was found that in order to ensure reliable switching in the entire range of switching currents of the contactor, it is necessary that the parameters of the elements of the switching circuit and the charge circuit of the switching capacitor were selected on the condition that the current in the switching circuit of the power NC at the moment of its switching was equal to the current in the charge circuit of the switching capacitor. In this case, the value of this current should not be less than the maximum switching-off current of a fully controlled NC. This makes it possible to reasonably approach the determination of the parameters of the elements, which ensure the secure locking of the two-directional NC. As a result of the studies, it was also shown that the proposed hybrid contactors due to the introduction of voltage control of the network compared to the existing ones have competitiveness enhancing properties. In particular, they increase the reliability of the work, they do not need to supply an additional source of power, they exclude standard drivers, minimize energy consumption. Thus, an exemplary aspect of using the scientific result obtained is the ability to create competitive on-line hybrid DC contactors with a voltage up to 1000 V and currents of 100 ÷ 600 A for alternative energy.
Highlights
In global industrialized countries is emerging a trend to widespread development both microgrids of direct current and low voltage, and high voltage distribution system of medium voltage [1]
The above-said is caused by the intensive development of so called «Smart Grids», that widely use alternative sources of energy, as a rule, wind turbine generators and solar electric plants. For all such essential advantages of direct current micro grids, as low losses of power, lack of reactive power, they have own problems connected with a lack of serviceable switching devices, that is caused by the complexity of practical implementation of arch control conditions in direct current grids[2]
The usage of hybrid contactors of power and control of electronical scheme of the grid voltage allowed to obtain a number of positive qualities, that raise their competetiveness in the systems of direct current electricity transmission
Summary
In global industrialized countries is emerging a trend to widespread development both microgrids of direct current and low voltage (up to 1000 V), and high voltage distribution system of medium voltage (up to kV and higher) [1]. The above-said is caused by the intensive development of so called «Smart Grids», that widely use alternative sources of energy, as a rule, wind turbine generators and solar electric plants For all such essential advantages of direct current micro grids, as low losses of power, lack of reactive power, they have own problems connected with a lack of serviceable switching devices, that is caused by the complexity of practical implementation of arch control conditions in direct current grids[2]. Nowadays in the most successful ways are allowed to solve this very above-mentioned problem the hybrid switching devices, that combine with the advantages of contactless devices (archless commutation) and contact ones (low losses of power in conducting state), two directional current of energy[3] In connection with this the works directed at the invention of new construction principles of more effective hybrid commutation devices, including contactors, and at the development and improvement their calculation methods are no doubt,actual ones
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