60results about How to "Stabilize bus voltage" patented technology

A kind of railway locomotive AC traction co-phase power supply device based on YN, vd connection transformer, wherein the traction transformer is a three-phase-two-phase balance transformer (T) with YN, vd connection, the line voltage output end of the transformer (T) (T) A rectifier inverter (Z) is connected between b', c') and the phase voltage output terminals (a, x), and the line voltage output terminals (b', c') or the phase voltage output terminals (a, x) are used as The power supply terminals (V1, V2) of the traction locomotive; at the same time, the control device of the rectifier inverter (Z) is connected with the power supply terminals (V1, V2) of the traction locomotive. The device can realize the same-phase power supply for the entire railway line without the need for phase separation, and the power supply voltage of each traction substation section is stable, ensuring the high-speed and heavy-load operation of the locomotive; the power supply system of the railway traction load draws power from the three-phase power grid, eliminating the need for railway Influence of traction load on power quality of utility grid. In addition, the device can be transformed by using the existing traction transformer, with low cost and easy implementation.

The invention provides an AC and DC mixed micro-grid system based on a power electronic transformer and a power control method of the system. The system comprises a main grid, an AC micro grid, a DC micro grid and the power electronic transformer. According to the operation states and power requirements of the AC micro grid and the DC micro grid, the power electronic transformer adjusts the power of the AC micro grid and the DC micro grid in a mixed sagging method. Thus, the power of the main grid, the AC micro grid and the DC micro grid can be rapidly and accurately adjusted, it is ensured that the frequency of the AC micro grid and the bus voltage of the DC micro grid are stable, and stable operation of the AC and DC mixed micro-grid after access of distributed energy is realized.

The invention discloses an adjusting method for a dynamic reactive compensation controller. The adjusting method comprises the following steps: firstly, collecting the busbar current of a three-phase system, the busbar voltage of the three-phase system and the current of a three-phase thyristor controlled reactor in real time; then carrying out closed loop proportional-integral-differential (PID) adjustment on the current of the three-phase thyristor controlled reactor according to the compensated admittance of each parallel branch, and outputting the triggering angle of the thyristor controlled reactor; simultaneously, carrying out closed loop PID adjustment on the busbar voltage of the three-phase system, and outputting the triggering angle of the thyristor controlled reactor; and finally, according to whether each phase of voltage is in a specific range or not, judging whether to adopt the closed loop PID adjustment of the second step or the third step, and outputting the actual triggering angle of the thyristor controlled reactor. The method provided by the invention can increase the power factor, reduce the reactive power, decrease the line loss, improve the transmission capacity of the active power of a power transmission line, stabilize the busbar voltage, and inhibit the voltage fluctuation and flicker.