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 relates to a portable insulation safety tool power-frequency voltage-withstand dolly, comprising a dolly portion, a clamping portion, a conductive portion, a measuring portion, and a storage portion. The portable insulation safety tool power-frequency voltage-withstand dolly can satisfy power-frequency voltage-withstand test requirements of insulating gloves, insulating boots, an insulating rods, an electroscope, a grounding wire, an insulating septum, an insulating rubber mat, and other various safety tools. The dolly saves large amount of manpower and material resources, reduces occurrence of safety accidents, and has good economical benefits and social benefits. Because of application of the test dolly, the number of times of use of the dolly to carry tools is reduced, and the dolly brings about considerable environmental benefits.

The invention discloses a two-AC and one-DC series-parallel microgrid structure suitable for multi-station integration. The series-parallel microgrid structure is formed by series-parallel connectionof an alternating-current sub-microgrid 1, an alternating-current sub-microgrid 2 and a direct-current sub-microgrid, wherein the alternating-current sub-microgrid 1 is connected with the direct-current sub-microgrid through a power conversion device and a connecting point 1, and the alternating-current sub-microgrid 2 is connected with the direct-current sub-microgrid through a connecting point2; the connecting point 1 and the connecting point 2 are DC/AC conversion devices, the connecting point 2 is a standby power supply point of the connecting point 1, the energy of the connecting point2 can only flow in one direction, and the voltage is rapidly supported for the direct-current sub-microgrid only when the connecting point 1 fails; the alternating-current sub-microgrid 2 comprises aNo.2 energy storage and station transformer, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the NO.2 energy storage and station transformer is connectedwith an external network, the 400V/380V isolation transformer and the AC/DC conversion device, and the AC/DC conversion device is connected with the energy storage battery. The series-parallel microgrid structure is high in reliability, wide in coverage, high in fusion degree and excellent in economy.

The invention discloses a voltage dip disturbance source identification method based on a voltage space vector; the method comprises the following steps: converting three-phase voltage into one-dimension time variant complex variable; using DFT to form amplitudes, harmonic waves and phase angle characteristic quantity so as to detect and represent the voltage dip, and identify the disturbance source causing the dip; using three dimensional visualization description of the space vector to specifically represent the whole voltage dip. The method uses less variables in each phase analysis, is small in calculation, easy to realize in engineer, can deeply and systematically analyze and study the voltage dip problems, can further control and manage the voltage dip, thus ensuring qualified power supply for users, improving power quality, and promoting intelligent power grid development, so important reality meaning can be provided.

An image forming apparatus that ensures high-quality power supply to an AFE (analog front-end) and reduces the amount of power consumed by the AFE in sleep mode. The AFE, which converts an analog signal into a digital signal, and another circuit different from the AFE are incorporated in an SOC (system-on-a-chip). A switch circuit switches power to the AFE between first DC power supply from a 5-V/3.3-V_LDO and second DC power from a 24-V/3.3-V_DC-DC converter. When the AFE is in use, the switch circuit is controlled such that the first DC power is supplied from the 5-V/3.3-V_LDO to the AFE, and when the AFE is not in use, the switch circuit is controlled such that the second DC power is supplied from the 24-V/3.3-V_DC-DC converter to the AFE.

The invention relates to a bundled conductor aeolian vibration determination method considering a spacer damping parameter. The method is based on spacer line clamp damping parameter computational analysis and experimental study and combines a spacer average subspan calculation method, the real spacer damping is applied to a proper position of a bundled conductor, and finally, solution of bundled conductor aeolian vibration is realized with a finite element method, so that the bundled conductor aeolian vibration level is determined, and a reference is provided for anti-vibration design of lines. The method can make up defects of solving bundled conductor aeolian vibration on the basis of a traditional reduction factor method.

The invention discloses an electric vehicle charging pile load interactive control system which comprises an interactive system main station, client interactive terminals and charging pile terminals,and is characterized in that the interactive system main station is in electric signal connection with the charging pile terminals and the client interactive terminals, and the charging pile terminalsare in electric signal connection with a transformer and switches; the transformer is in electric signal connection with the switches, the switches are in electric signal connection with the chargingpiles, and the number of the client turntable terminals and the number of the charging piles are both multiple. From the perspective of an intelligent power grid, the supply and demand relationship can be balanced, and the reliability of the system is improved; from the perspective of users, economic returns and benefits can be obtained by adjusting or changing the modes of using and purchasing electric power; from the perspective of the environment, energy conservation and emission reduction are facilitated, and increasingly serious energy crisis is relieved.

The invention discloses an electric vehicle charging pile load interactive control system and an application method thereof, and belongs to the technical field of load interactive control, the electric vehicle charging pile load interactive control system comprises a transformer used for converting voltage of a transmission circuit into commercial power, and a first switch used for opening and closing a circuit. The application method of the electric vehicle charging pile load interactive control system comprises the steps that S1, a user fills in personal basic information, vehicle basic information and the like on the APP for registration, S2, the user can check the number of vehicles capable of being charged by a transformer at the same time and the number of vehicles being charged at present on the APP, the load rate of the transformer is mastered, the supply and demand relation can be balanced, and the reliability of the system is improved; from the perspective of user thinking, economic returns and benefits can be obtained by adjusting or changing the mode of using and purchasing the electric power; from the perspective of environment, energy conservation and emission reduction are facilitated, and increasingly serious energy crisis is relieved.

The establishment of the power project cost database system includes analyzing and determining the key technical and economic indicators of power project investment control, and establishing a project cost data collection model; establishing a historical project cost experience database to provide reference data for reviewing project cost; intelligently selecting historical projects to realize historical Automatic comparison between projects and pending projects to improve review efficiency. The establishment of this database system is safe and reliable, with advanced technology, environmental protection, reasonable investment, unified standards, and efficient operation, and promotes the construction of power grids to better cooperate with social and economic development, avoiding the risk of investment waste becoming a bottleneck in economic development. On the other hand, under the premise of ensuring the safe and reliable operation of the power grid and the social demand for electricity, reasonably reduce the project investment cost, minimize the operating cost of the power grid enterprise, and realize the sustainable development of the company, thereby proposing safe, reliable and high-quality solutions for social development. , Low-cost electricity supply.

The invention discloses a building fire scene monitoring system based on an unmanned aerial vehicle and an implementation method thereof, and the system comprises the unmanned aerial vehicle, a holder structure disposed on the unmanned aerial vehicle, a high-altitude displacement telemetering device connected to the holder structure, and a corresponding signal conversion circuit and a voltage stabilizing circuit, a displacement beacon arranged outside the building, a temperature sensor, a displacement sensor and a low-delay communication device which are arranged inside the building, and a monitoring and early warning terminal for receiving and processing signals. A 3D digital model is established for the high-risk fire building, and a building fire collapse database is established through simulation analysis; the displacement value of each monitored part is compared with a displacement threshold value in a database, and early warning processing is carried out. According to the invention, a mode of combined monitoring inside and outside the building is adopted, the unmanned aerial vehicle is adopted to carry the high-altitude displacement telemetering device above the building for monitoring, and monitoring information is transmitted in a low-delay manner, so that effective monitoring of a building fire scene is realized.

The invention discloses a motor train unit braking energy self-adaptive recovery device and recovery method, and belongs to the technical field of dynamic electric energy recovery type braking. The data acquisition unit is used for acquiring current data on each power supply arm; the energy storage device is used for realizing storage or release of braking energy and enabling electric energy to be subjected to bidirectional conduction between the two sets of converter devices; the control part is used for receiving the data of the data collector, analyzing and processing the data and further controlling the converter device and the energy storage device to act; the converter device performs voltage transformation and conversion on the traction power supply to obtain a 10kV power supply used by a railway through power supply or a self-closing power supply; and the direct current buses of the two sets of converter devices are connected through the energy storage device. Braking energy is flexibly transferred between the two traction arms, the residual braking energy is temporarily stored in the energy storage device, and after braking of the electric motor train unit is finished, the energy in the energy storage device is gradually released to a railway through or self-closing load through the converter device.

The invention discloses a real-time monitoring system for the information of an unattended substation, and the system comprises an on-site collection device, a monitoring branch unit, an electricity obtaining module, a monitoring center host, and a communication module. The electricity obtaining module supplies power to an on-site monitoring module and a line monitoring branch unit. The on-site collection device is an electronic eye which can move and can enable a camera to rotate up and down and left and right. The system is small in size, is easy to install, is complete and accurate in data collection, and can collect data in real time. The system completely improves the resource optimization configuration capability of a power grid, improves the operation efficiency of a power system, guarantees the safe, excellent and reliable supply of power, and has great significance.

The invention discloses an emergency regulation system for three-phase power imbalance. The emergency regulation system comprises a power grid input unit, a direct-current battery unit, an alternating-current output unit, a control unit and a signal acquisition unit, wherein the power grid input unit comprises an input contactor, an alternating-current fuse, a direct supply contactor and a load contactor; the electric direct-current battery unit comprises a single-phase controllable rectifier, a filter reactor, a filter capacitor, an isolation diode, a direct-current switch, a direct-current fuse and a battery pack; the alternating-current output unit comprises a three-phase full-bridge inverter, a filter reactor and an output contactor; the signal acquisition unit is connected with the voltage monitoring end of the power grid input circuit, the voltage and current monitoring end of the battery pack and the voltage and current monitoring end of the three-phase full-bridge inverter; andthe control unit is used for controlling the closing and opening of the corresponding contactors and switches by analyzing signals of the signal acquisition unit and outputting signals to the single-phase controllable rectifier and the three-phase full-bridge inverter so as to carry out control.