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3141 results about "Statics" patented technology

Statics is the branch of mechanics that is concerned with the analysis of loads (force and torque, or "moment") acting on physical systems that do not experience an acceleration (a=0), but rather, are in static equilibrium with their environment. When in static equilibrium, the acceleration of the system is zero and the system is either at rest, or its center of mass moves at constant velocity. The application of Newton's second law to a system gives: 𝐅=m𝐚 .

An energy-feedback type traction power supply device and its control method

The invention discloses an energy feeding type dragging power supply device and a control method thereof. The energy feeding type dragging power supply device comprises a multiple transformer and at least two four-quadrant converter modules. The energy feeding type dragging power supply device and a diode rectification dragging unit are arranged in parallel form. A primary side of the multiple transformer of the energy feeding type dragging power supply device is connected to an alternated current medium-voltage power grid through a high-voltage switch cabinet; each set of windings at a low-voltage side of the multiple transformer is connected to an alternated current side of one four-quadrant converter module; and the direct current sides of the four-quadrant converter modules are in parallel connection after being connected to a direct current side isolation switch and are connected to a direct current bus through a direct current switch cabinet and a cathode cabinet. The energy feeding type dragging power supply device can work at three different modes of dragging, feedback or SVG (Scalable Vector Graphics) according to the requirements. The energy feeding type dragging power supply device is compatible with an existing dragging power supply system under the condition of meeting a power grid compatibility demand. The energy feeding type dragging power supply device has the advantages of moderate cost, capability of solving the technical problems of feeding back a regenerated braking energy and stabilizing a dragging network voltage, and real-time static reactive power compensation capacity.
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD

Model prediction control method of voltage source type rectifier when network voltage is unbalanced

The invention belongs to the field of power converter control and relates to a model prediction control method of a voltage source type rectifier when a network voltage is unbalanced. The model prediction control method of the voltage source type rectifier when the network voltage is unbalanced comprises the steps of converting three-phase network voltage and a three-phase current into network voltage and a current which are under a two-phase static coordinate system through an abc / alpha beta coordinate, obtaining network positive sequence voltage and negative sequence voltage by carrying positive and negative sequence component separation of the network voltage under the two-phase static coordinate system, calculating reference values of active power, calculating current reference values of the rectifier under the two-phase static coordinate system, and carrying out model prediction current control and selecting an optimal on-off state. The model prediction control method of the voltage source type rectifier when the network voltage is unbalanced is capable of quickly and precisely tracing the current under the two-phase static coordinate and effectively eliminating fluctuation of direct current side voltage at the same time, power quality of the system is improved, a reliable network-connected operation of the rectifier when transient state network voltage is unbalance is achieved, and dynamics and stability of the whole system are improved.
Owner:TIANJIN UNIV
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