30results about How to "High quality power supply" patented technology

The invention discloses a STATCOM (static synchronous compensator) control system adopting a droop control strategy and a control method thereof. The STATCOM control system adopting the droop control strategy comprises a direct-current side capacitor, a three-phase inverter bridge and an inductance-capacitance filter, wherein the direct-current side capacitor and the three-phase inverter bridge are connected in parallel and then connected with the inductance-capacitance filter, and the inductance-capacitance filter is connected to a PCC (Point of Common Coupling) of a power grid by a three-phase switch K through a coupling transformer T. The control method disclosed by the invention comprises the steps of real-time signal collection, computation of active power reference value P*, computation of reactive power reference value Q*, computation of frequency reference value omega* and voltage modulation amplitude reference value E*, computation of phase reference value Delta* and computation of voltage modulation signals; and only one PI (proportional integral) regulator and two droop control coefficients need to be regulated, thus the whole control method is easy to realize, and further the power system can better supply power to users safely, excellently and economically.

The invention discloses a braking energy self-adaptive recovery device and a recovery method for an EMU, belonging to the technical field of dynamic electric energy recovery braking, including: two sets of converters; data for obtaining current data on each power supply arm Collector; an energy storage device that realizes the storage or release of braking energy and completes two-way conduction of electric energy between two sets of converter devices; receives data from the data collector, analyzes and processes the data, and then controls the converter device, The control unit for the operation of the energy storage device; the converter device transforms and converts the traction power supply to obtain a 10kV power supply for the railway through power supply or self-closing power supply; the DC buses of the two converter devices are connected through the energy storage device. The invention realizes the flexible transfer of braking energy between the two traction arms, the remaining braking energy is temporarily stored in the energy storage device, and after the braking of the EMU, the energy in the energy storage device is gradually transferred to the Rail penetration or self-closing load release.

The invention discloses an electrification oil sample acquisition device for an oil-immersed sleeve pipe of a transformer, comprising an oil conservator of a corrugated metal expansion apparatus, a four-way valve, a sleeve pipe of the transformer and an aciform sample acquisition valve, wherein, the oil conservator of the corrugated metal expansion apparatus is suspended and installed on a fastening bolt on the top of cone of the sleeve pipe of the transformer in a regular way, the four-way valve is arranged on the lower end of the oil conservator of the corrugated metal expansion apparatus, the vertical downward interface of the four-way valve is connected with a connecting pipe by a joint, the connecting pipe is connected with the exhaust hole of the sleeve pipe of the transformer by a through screw, a downward guidance pipe is connected to the lower end of the sleeve pipe of the transformer, and the aciform sample acquisition valve is connected to the other end of the downward guidance pipe. The invention realizes the function of electrification oil sample acquisition of the sleeve pipe of the transformer, realizes the troubleshooting and the maintenance of the sleeve pipe of the transformer under the state of uninterrupted power supply, thoroughly solves the conflict between the scheme of troubleshooting of equipment state and the requirement of periodical power cut for the sample acquisition analysis of the sleeve pipe, achieves the controllability and the under-control of the technical supervision of the equipment, and lays a solid foundation for the high-quality, safe and reliable power supply for the society.

The invention belongs to the technical field of power electronics, and specifically relates to an improved three-phase four-bridge arm topology for realizing active power decoupling used in a system containing a single / three-phase unbalanced load or source. The improved three-phase four-bridge arm topology comprises eight switch tubes S1, S2, S3, S4, S5, S6, S7, S8, four inductors La, Lb, Lc and Ln and five capacitors Ca, Cb, Cc, Cn, Cdc. When the single / three-phase unbalanced load or source exists, a fourth bridge arm is controlled, a passage is provided for a zero-sequence component by usinga center line, and then three-phase phase voltage balance is realized, and high-quality power supply is provided for the load; secondary impulse power on an alternating current side is provided by the capacitors on the alternating current side through active power decoupling control, a direct current side just needs to provide the average power component on the alternating current side, on the basis of without adding switch devices, a secondary impulse power decoupling purpose is realized, the tolerance of supporting capacitors on the direct current side can be reduced effectively, and the influence of secondary impulse power on direct current source or front system control performance is avoided.