61 results about "Single phase converter" patented technology

Disclosed is a controller of a grid coupled type doubly-fed induction generator having a multi-level converter topology, which can control the doubly-fed induction generator having a high voltage specification and can perform a fault ride-through function, an anti-islanding function and a grid voltage synchronization function required for a dispersed power generation facility. The controller makes a H-bridge multi-level converter generate a three-phase voltage waveform resulted from the structure that single-phase converters each being composed of a 2-leg IGBT are stacked in a serial manner, and controls a rotor current so as to make the rotor coil of the doubly-fed induction generator in charge of a slip power only. The boost converter is composed of a 3-leg IGBT and a boost inductor generating a direct current voltage of its source required for the H-bridge multi-level converter.

A power quality management system includes a plurality of phase balancers, each phase balancer including single phase converters coupled between two phase lines and a plurality of controllers to control the plurality of phase balancers. Each controller includes a voltage unbalance detection module to detect amount of voltage unbalance in a plurality of phase lines and a voltage unbalance compensation module to generate reference current commands for each of the single phase converters to reduce the voltage unbalance.

The invention relates to an electric split-phase non-interruption flexible connection-compensation device and method for a traction electric network, belonging to the technical fields of railway transportation equipment and electric power and electronics. The device comprises a two-phase back-to-back converter set and three position sensors, wherein the two-phase back-to-back converter set comprises two single-phase converter sets Va and Vb sharing a DC side capacitor set, and two single-phase reduction transformer sets Ta and Tb respectively connected with AC sides of the two single-phase converter sets Va and Vb, or a single-phase reduction transformer set Ta or Tb connected with the AC side of the single-phase converter set Va or Vb, and also comprises three electric quantity sensors, a killer switch, a controllable fling-cut switch and a main controller. The device can work in two modes, and realizes that an electric locomotive passes through split phases without interruption and with loads. The device has functions of active power transfer, reaction power compensation and harmonic compensation, and can solve the problems of three-phase voltage imbalance, voltage fluctuation, low power factor, harmonic pollution and the like in a traction substation.

The invention relates to an alternating current-direct current conversion technology and discloses a three-phase bridgeless power factor correction (PFC) alternating current-direct current converter. The technical scheme of the invention is as follows: the alternating current-direct current converter comprises an A-phase converter, a B-phase converter, a C-phase converter and a control system for the A-phase converter, the B-phase converter and the C-phase converter, wherein the A-phase converter, the B-phase converter and the C-phase converter are bridgeless double boost power factor correction converters with same structure; the alternating current input ends of the A-phase converter, the B-phase converter and the C-phase converter are respectively connected with an A-phase line, an A-phase central line, a B-phase line, a B-phase central line and a C-phase phase line and a C-phase central line; and the direct current output positive ends and the direct current output negative ends of the converters are respectively connected to form the direct current output end of the three-phase bridgeless PFC alternating current-direct current converter so as to connect a load to provide direct current to the load. Due to the circuit design disclosed by the invention, not only can mutual interference and influence among three single-phase converters be reduced, but also the redundancy characteristics of the converters are realized; if one phase goes wrong, the other two phases still can supply power to the load so that the robustness of the system is greatly enhanced, and thereby the converter is very suitable for three-phase high-power applications.