3results about How to "Increased power transfer capability" patented technology

The application discloses a trigger optimization operation method suitable for a hybrid power grid commutation converter. When detecting that a fault occurs in an inverter-side alternating current system, a synchronous commutation voltage phase value corresponding to a current to-be-conducted bridge arm is assumed as a trigger angle to trigger, then a prediction means is used to obtain specific conditions of a supplied commutation area and a demanded commutation area in a next commutation process after triggering, and whether triggering is executed at present is judged based on the specific conditions. If the specific conditions do not satisfy preset optimal trigger conditions, a pulse signal is blocked, phase value updating is waited for, and the same operation of the new trigger angle corresponding to the phase value is executed until the preset conditions are satisfied. When the conditions are satisfied, a trigger pulse signal is directly sent to perform actual triggering, so that an optimal trigger time is found. The application can significantly improve the power transmission capacity of a direct current power transmission system during a fault in the inverter-side alternating current system, and improve the ability of the hybrid power grid commutation converter to resist commutation failure.

The invention discloses a bridge arm compensation modulation method suitable for a bridge arm multiplexing type modular multi-level high-voltage direct-current converter, and belongs to the technical field of high-voltage direct-current power transmission. The method comprises the following steps: firstly, generating respective quasi square wave reference voltage waveforms and quasi square wave reference current waveforms of a high-voltage bridge arm, a low-voltage bridge arm and a multiplexing bridge arm, then obtaining respective actual voltage reference values of the high-voltage bridge arm, the low-voltage bridge arm and the multiplexing bridge arm, then cooperatively adjusting the voltage of each bridge arm, generating a switching control instruction of each sub-module in each bridge arm, and finally switching the sub-modules in each bridge arm. And controlling the bridge arm current to complete quasi square wave commutation within a preset transition time, and completing bridge arm compensation modulation of the converter. The power transmission capacity, the dynamic response and the waveform quality are remarkably improved, meanwhile, the device is easily integrated into an existing bridge arm multiplexing type modular multi-level high-voltage direct-current converter, and the device is suitable for interconnection scenes of different direct-current voltage levels in a high-voltage direct-current power grid.

The application relates to the technical field of wireless power transmission (WPT) and specifically discloses a static anti-offset WPT system based on vector synthesis, which is characterized in that a single-polarity transmitting coil and a bipolar transmitting coil are arranged on the transmitting side, a single-polarity receiving coil is arranged on the receiving side, and the vector synthesis of two magnetic fields is realized by exciting the two transmitting coils with orthogonal phases. When the receiving end is offset in the transverse direction (y-axis), the mutual inductance of the single-polarity path is attenuated and the mutual inductance of the bipolar path is enhanced, which are complementary to each other, and the polarity cancellation problem of the induced voltage is eliminated in combination with the 90-degree phase difference, so that the synthesized mutual inductance remains stable in the whole offset range. The application breaks through the technical bottleneck that the power density and the offset tolerance are difficult to be considered in the traditional scheme, and provides an anti-offset solution with high stability and high material utilization rate for the field of wireless charging of electric vehicles.