570results about How to "Improve power supply efficiency" patented technology

A smart electricity meter with a function of monitoring and protecting power failure comprises a metering chip, a leakage current sampling circuit, a phase current sampling circuit, a phase voltage sampling circuit, a CPU (central processing unit), a power module and a low voltage breaker. The leakage current sampling circuit is electrically connected with the metering chip which is mutually electrically connected with the CPU. The CPU is electrically connected with the low voltage breaker through a trip output port. The low voltage breaker is electrically connected with the CPU through a status acquisition interface. The invention further provides a power failure monitoring and controlling method of the smart electricity meter. The smart electricity meter has the advantages that the reliable power module for power failure protection and control is provided, various types of power failure warning and protection are provided, failure warning and failure protection for voltage, current, power and the like are achieved for power users, failure spots are prevented and isolated, economic loss and personal safety accidents due to failure of electric circuit equipment of the users are prevented and reduced, and reliability of low voltage grids is effectively improved.

The invention relates to a vehicle-mounted fuel cell and storage cell directly paralleled power system with a super capacitor. The power system comprises a fuel cell galvanic pile, a fuel cell accessory system, a fuel cell controller, a storage battery group, a super capacitor group, a high voltage bidirectional DC / DC (direct current) converter, a small power unidirectional DC / DC converter, a motor controller, a driving motor and a system energy management controller, wherein a high voltage output end of the fuel cell galvanic pile is connected with an anode of a power diode through a high voltage switch K1, and the high voltage output end of the storage battery group is directly connected with a cathode of the power diode and the high voltage output end of the motor controller in parallel through a high voltage switch K2 to form a direct current bus. The super capacitor group is connected with the direct current bus through the high voltage bidirectional DC / DC converter, and the high voltage output end of the storage battery group is connected with the fuel cell accessory system through the small power unidirectional DC / DC converter. According to the system disclosed by the invention, a power supply mode in which galvanic pile output needs large power DC / DC voltage stabilization of a conventional fuel cell is abandoned, and the efficiency is improved; the instantaneous needed power of the direct current bus can be compensated by the arranged super capacitor group, the bus voltage is steadied, and braking energy can be quickly and effectively recycled.

A power supply includes a non-isolated DC-DC converter for use in a power source system having a high side switch and a low side switch, in which HEMT or HFET or gallium nitride device with low capacity and low on-resistance is used for the high side switch and a vertical power MOSFET of silicon device with low on-resistance is used for the low side switch.

The invention is a fluid bed gasification and combustion processing method for urban garbage. The hearth of a fluid bed garbage furnace (4) is composed of two parts of a low temperature gasification area and a high temperature combustion area, additives (f) such as limestone, kaolin, etc. are added to the garbage furnace (4); acid gases such as chlorine, sulfur, nitrogen, etc. are removed in the furnace; and the generation of dioxin is controlled in the furnace. A water cooling spiral slag cooler (5) and a vibration sieve (6) can be utilized to efficiently reduce heat loss of slag and recycle bed materials. The whole system requires no addition of auxiliary fuel, and has the characteristics of safe reliability, no odor emission, low investment and operating cost, less secondary pollutant discharge, high power generation efficiency, etc.

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered power.

The invention provides a small turbine system in a power plant for recovering the exhaust steam heat to the thermal cycle system in the power plant. The system comprises a backheating-type small turbine unit and a driven device driven by the backheating-type small turbine unit. The backheating-type small turbine unit comprises a small turbine, a small turbine admission pipe system and a small turbine exhaust pipe system. The small turbine admission pipe system is arranged on the upstream of the small turbine and receives steam source from the thermal cycle system in the power plant; the small turbine exhaust pipe system is arranged on the downstream of the small turbine; the exhaust steam of the small turbine exhaust pipe system enters to the backheating unit of the thermal cycle system in the power plant so that the exhaust heat is recovered. The invention further provides a backheating system and a thermal cycle system in the power plant containing the small turbine system in the power plant. The systems can greatly improve the power supply efficiency of the unit.

The invention discloses an LED (Light-Emitting Diode) television two-in-one power supply circuit and an LED television. The LED television two-in-one power supply circuit comprises a rectifying and filtering module, a PFC (Positive Feedback Circuit) module, a reverse excitation circuit module, an LLC (Logical Link Control) half-bridge resonant module, a constant-current module, a feedback module and an LLC control module. Alternating current is partitioned into two paths after being rectified and filtered and corrected by the PFC module; one path is used for supplying power to a motherboard core through the reverse excitation circuit module; and the other path is used for supplying power to an LED light bar through the LLC half-bridge resonant module. Power is supplied separately with two paths since voltages needed by the LED light bar and the motherboard core are different, so that the power supply efficiency is increased, and the element cost is lowered. The LLC control module is fed back to the primary stage of an LLC transformer of the LLC half-bridge resonant module, so that the resonant groove state is monitored in real time, and complete protection is realized. Moreover, the transformer does not need to be driven, so that the quantity of safety devices is small.

The invention discloses an automatic intelligent power distribution system and a power distribution method. The power distribution system comprises a power distribution executing unit, and the power distribution executing unit receives a power distribution command from a power distribution monitoring terminal and gates a corresponding phase line on a three-phase power transmission line to a single-phase power supply line on an output side of the power distribution executing unit to achieve intelligent power distribution. According to the automatic intelligent power distribution system, low-voltage three-phase disequilibrium distribution on an input side of a single-phase user is achieved through the power distribution executing unit on an input side of an electricity meter of the single-phase user, the power distribution monitoring terminal receives the electrical load information of each single-phase user in a wireless or power line carrier communication mode, and a basis is provided for the equilibrium distribution of single-phase user quantity on each phase line of the three-phase power transmission line on the whole; the power distribution monitoring terminal sends the power distribution command to the power distribution executing unit and the power distribution executing unit enables each single-phase user to be connected to a corresponding power supply phase line in a grouping mode, and therefore equilibrium power distribution is achieved for single-phase users on a low-voltage side.

The invention discloses a brown coal drying method and device utilizing waste heat of smoke and steam of a power plant. The drying method comprises two-time drying treatment, wherein the two-time drying treatment comprises the steps that firstly, the high-temperature smoke directly discharged by a power plant coal fired boiler is utilized for conducting first-time drying treatment on damp materials, the high-temperature smoke directly makes uniform contact with the damp materials, and intermediate materials are obtained; and secondly, the high-temperature smoke and the high-temperature steam directly discharged by the power plant coal fired boiler are utilized for conducting second-time drying treatment on the intermediate materials at the same time, the high-temperature smoke directly makes uniform contact with the intermediate materials, meanwhile, the intermediate materials make uniform contact with a heat exchange pipe inflated with the steam for heat exchange, dried materials are obtained, and second-time drying treatment is achieved. The brown coal drying method and device have the beneficial effects that the power plant waste heat serves as a heat source for brown coal drying, the running economical efficiency of a power plant generator set is improved, a system for drying the brown coal and a brown coal power generation system are integrated, efficient utilization of power plant energy and optimization of a technology system are achieved, and the brown coal drying method and device belong to the poly-generation technology of the power plant.

The invention relates to a distributed generation intelligent monitoring system. The intelligent monitoring system can predict the generated power of a photovoltaic module and a wind power module of distributed generation, and the changes of loads and implement the optimal control strategy on the basis of the energy storage conditions of a storage battery module, the running conditions of a diesel generator and the running conditions of a power distribution network, wherein the storage conditions of the storage battery module and the running conditions of the diesel generator are detected in real time, and the running conditions of the power distribution network are obtained in real time.

The invention relates to a micro-grid power supply and a monitoring method. According to the monitoring method, generated power of a photovoltaic module and a wind power module of a micro-grid can be predicted, the change situation of loads is predicted, based on the energy storage condition, detected in real time, of a storage battery module and the running condition, obtained in real time, of a large grid, a power supply strategy is formulated, and therefore the micro-grid can be in a safe and economical running state making users satisfied.

The invention discloses a traction motor power supply system and an electric locomotive power supply device. The traction motor power supply system comprises an energy storage system, a contactor, aninverter and a disconnecting switch, the energy storage system is connected with a first end of the contactor and used for outputting direct current, a first end of the inverter is connected with a second end of the contactor, and a second end of the inverter is connected with the disconnecting switch and used for converting direct current generated by the energy storage system into alternating current and supplies power for a traction motor. The supply system supplies power for the traction motor of an electric locomotive in non-electric areas by the aid of the energy storage system and the inverter, so that the electric locomotive automatically and continuously passes the non-electric areas.

The invention provides a wind power, photovoltaic power, stored energy and wave energy comprehensive utilization power generation device for a ship. The comprehensive utilization power generation device comprises a ship photovoltaic power generation system, a ship wind power generation system, a ship wave energy power generation system, a ship lithium battery energy storage system, a direct current grid-connected system, an inverter system and an alternating current grid-connected system. The ship photovoltaic power generation system, the ship wind power generation system, the ship wave energy power generation system and the ship lithium battery energy storage system are all connected to the input end of the direct current grid-connected system in parallel, and the output end of the direct current grid-connected system is connected with the alternating current grid-connected system through the inverter system. The comprehensive utilization power generation device for the ship has the advantages that wind energy, solar energy, wave energy and storage battery stored energy are arranged through the systematized and integrated design, so that the power generation device has an important value on achieving ship energy diversification, energy saving and emission reduction and improving the competitiveness of the ship.

The invention belongs to the power transmission and transformation equipment field and relates to an energy-saving box type outdoor substation. The substation comprises a top cover and a box body; the box body is divided into a high-voltage chamber, a transformer chamber and a low-voltage chamber. The energy-saving box type outdoor substation further comprise an intelligent controller; the intelligent controller is connected with a low-voltage chamber power transmission line through a power source input cable; the high-voltage chamber is provided with a high-voltage entering cabinet, a high-voltage metering cabinet, a high-voltage ring main unit and a high-voltage outgoing cabinet; the low-voltage chamber is provided with a low-voltage entering cabinet, a high-voltage reactive power automatic compensation capacitor cabinet and a low-voltage outgoing cabinet; and a transformer arranged in the transformer chamber is an on-load automatic capacitance adjustment power distribution transformer. The energy-saving box type outdoor substation is safe, reliable, energy-saving and efficient. With the energy-saving box type outdoor substation adopted, a power factor as well as the power supply efficiency and voltage quality of a system can be improved, and line loss can be decreased, and distribution line cost can be decreased, and electric energy can be saved, and the occupancy of a power grid and the no-load reactive loss and active loss of the transformer can be decreased, and capacity increasing cost and operation cost can be saved, and saving energy and consumption reduction can be realized, and great economic benefits and social benefits can be brought about.

The embodiment of the invention discloses a short-circuit current calculation method and system, and the method comprises the following steps: S01, forming a basic database according to an actual power grid, and building a model of a set power grid operation mode; s02, scanning the short-circuit current level of the whole network; s03, solving each sequence impedance reduced to the short-circuit point by using a Newton method in combination with an iterative method, and solving the total current of the short-circuit point; s04, superposing the positive sequence component, the negative sequencecomponent and the zero sequence component of the total current of the short-circuit point to obtain a final short-circuit current; an inverter circuit, a control system and a boosting transformer control circuit are utilized. The positive sequence component, the negative sequence component and the zero sequence component can be superposed to obtain voltage and current of each phase; a set value of the internal potential of the inverter type photovoltaic power supply is generated through the step-up transformer control circuit recursive function, an overall mathematical model of a line power grid is established, the calculation amount is reduced, the calculation speed is increased, the calculation time is shortened, the operation efficiency is improved, the power supply safety can be improved, and the power grid can flexibly operate.

The invention discloses a control device and a control method for an AC-DC (Alternating Current-Direct Current) series resonant matrix converter for capacitor charging and mainly aims at solving the problem in the prior art that the control property of a capacitor charging power supply is not high enough to meet the power supply requirement of a high-power microwave system. The control device for the AC-DC (Alternating Current-Direct Current) series resonant matrix converter for capacitor charging comprises a zero-crossing comparator, an On-Off state control unit, a timing sequence generating unit, a control parameter calculation unit, a load voltage acquisition circuit and a trigger driving circuit. The invention further discloses a control method of the control device. With the technical scheme, the control device and the control method, disclosed by the invention, have the advantages that the price / performance ratio is relatively high property, the power supply requirement of the high-power microwave system can be sufficiently met, and the practical value and the popularization value are high.

The invention provides a low-voltage reactive compensation control device with a fault diagnosis function. The low-voltage reactive compensation control device comprises a data processing and storing unit consisting of a microprocessor and a storage chip, a sampling signal processing unit, a sampling circuit, a liquid crystal display unit, an output signal and the like. A software part of the low-voltage reactive compensation control device provided by the invention consists of a data storage calculation and fault diagnosis program. The data storage calculation and fault diagnosis program consists of a fault database, a fault diagnosis module and the like; and the design ideal of the fault diagnosis database refers to recording experience that the engineering personnel daily maintains a reactive compensation system as an experience database through numbers. A diagnosis process is a data matching process based on important degree; the collected data is matched according to a rule in a rule base of an expert system in an order form small important degree to large important degree; and a fault diagnosis module has universal detection and good generality of a fault diagnosis rule base according to a user setting value and corresponding fault alarm triggered by a fault, so as to help the field maintenance personnel rapidly to find out the fault.

The invention relates to a micro grid power monitoring system. The monitoring system can predict the power generating power of a photovoltaic module and a wind power module of a micro grid, predict load change, and formulate a power supply strategy based on the energy storage condition of a storage battery module detected in real time and the running condition of a large grid obtained in real time, so that the micro grid is in a safe and economic running state satisfying consumers.

The invention discloses a power supply and a power supply system with multiple power supplies. The power supply is used for receiving an electric energy of an input voltage and generating an output voltage and an output current. The power supply comprises a power convertor, an output protecting circuit and a control unit, wherein the power convertor is used for receiving the electric energy of the input voltage and generating an inner output voltage; the output protecting circuit is connected with an output end of the power convertor and comprises a plurality of switch circuit sets in parallel connection; the output protecting circuit is used for limiting a current direction of the output current under an switch-on / off action of the switch circuit sets; the control unit is electrically connected with the output protecting circuit; and the control unit is used for outputting a plurality of control signals for respectively controlling the switch circuit sets, wherein at least two control signals are included and are used for respectively controlling at least two switch circuit sets to switch off at different moments. The power supply provided by the invention can be used for increasing power supply efficiency under the normal running of the power supply and the production cost is lower.

The invention relates to an air preheating system of a thermal power generator set, in particular to an air pre-heating system and method performing steam extraction by utilizing a steam turbine. In the system, a primary air preheating subsystem and a secondary air preheating subsystem are coupled with a boiler system and a steam turbine system of the thermal power generator set to form a novel boil feed water preheating system. Primary air is heated by a four-stage air heater and a first-stage drain water cooler to reach primary air rated temperature. Secondary air is heated by a five-stage air heater to reach a secondary air rated temperature. The air preheating system effectively solves the air leakage problem, reduces operation power consumption of a primary fan, a forced draught blower and an induced draft fan and improves the generating efficiency of a coal-fired power plant. In addition, the primary air temperature and the secondary air temperature can be flexibly adjusted by adjusting steam extraction volume of the air heaters and opening degree of a drain water by-pass valve.

The embodiment of the invention provides an electric control method, device and system and relates to the technical field of electronics. The electric control method, device and system solve the problem that due to the fact that a power supply input mode in a power supply system is single, and consequently normal power supply of electric equipment cannot be ensured to a certain extent. According to the scheme, the electric control method includes the steps that the output power of a direct-current power supply device, the output power of an alternating-current power supply device , the output power of a battery power supply device and the working power of the electric equipment are obtained; one of the direct-current power supply device, the alternating-current power supply device and the battery power supply device is selected as the first power supply device for supplying power to the electric equipment; if the output power of the first power supply device is smaller than the working power of the electric equipment, the second power supply device is selected, the second power supply device and the first power supply device supply power to the electric equipment at the same time, and the sum of the output power of the second power supply device and the output power of the first power supply device is larger than the working power of the electric equipment.

The invention discloses a non-contact power supply system using a frequency conversion soft switch driving technology and a driving method thereof. The non-contact power supply system comprises a primary loop and a secondary loop, and the primary loop transmits energy to the secondary loop. A primary side control device is connected with an input voltage detection device, an input current detection device CTi, a driving circuit and a wireless receiving and sending module. The input voltage detection device and the input current detection device CTi are used for detecting the terminal voltage and the current of a DC power source (i) UDC ( / i) respectively. The primary side control device converts control signals into driving voltages for controlling a first switch tube S1, a second switch tube S2, a third switch tube S3 and a fourth switch tube S4. A secondary side feedback control device and a load voltage detection device are connected with a load current detection device CTO and a wireless receiving and sending module, the load voltage detection device and the load current detection device CTO are used for detecting the terminal voltage and current of a load (i) RL ( / i). The non-contact power supply system is always in a soft switch working state, and is high in working efficiency.

A self-adjusting power supply circuit of silicon controlled dimming in LED lighting, having a first resistor, a second resistor, a third resistor, a first diode, a second diode, a third diode, a fourth diode, a comparator, a first invertor, a second invertor, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a switch transistor, a fifth field effect transistor, and a parasitic capacitor; the first resistor and the first diode are connected in series; the fourth diode is connected in parallel with the first resistor and the first diode; the second resistor and the third resistor are connected in series; two pins of the first invertor are connected respectively with the comparator and the second invertor; the first field effect transistor is connected in series with the second field effect transistor and the second diode; the third field effect transistor is connected in series with the fourth field effect transistor; the third diode is connected in parallel with the fifth field effect transistor; the fifth field effect transistor is connected in parallel with the parasitic capacitor; the fifth field effect transistor is connected in series with the switch transistor.

The invention provides a computer, a computer power supply control device and a power supply control method. The device comprises a monitoring unit, a judging unit and a control instruction generating unit, wherein the monitoring unit is used for acquiring state information of one power consumption component in the computer, and the state information of the power consumption component comprises aworking state and an idle state; the judging unit is used for comparing the idle state duration time with a preset threshold time when the state information is in the idle state, and generating a comparison result when the idle state duration time is equal to or greater than the preset threshold time; and the control instruction generating unit is used for generating a control instruction for controlling the power failure of a host power supply according to the comparison result, and the host power supply stops supplying power to the power consumption component based on the control instruction. By using the technique provided by the invention, the power supply of the power consumption component can be thoroughly cut off in the idle state so that the whole computer system can save electricenergy so as to realize timely and flexible power failure according to the state of the power consumption component and improve the power supply efficiency of the system.

The invention provides an electric automobile driving charging system based on a cable system, a lifting system, an energy switching interface, an automobile-mounted terminal and a central regulation and control system. When an electric automobile needs to be charged and is driven into a charging circuit, the lifting system rises and enables the cable system to be connected, and the energy switching interface is switched to be powered by the cable system; the automobile-mounted terminal monitors automobile state parameters and electricity consumption and communicates with the central regulation and control system; the electric automobile has two driving states, namely manual driving and automatic driving, during charging driving; and the central regulation and control system monitors the states of charging-driving automobiles on the whole circuit, regulates the power supply amount and regulates and controls the automatic / manual driving automobile speed. According to the electric automobile driving charging system, the charging waiting time can be thoroughly eliminated, the cruising power can be improved, the dependence on fossil energy can be avoided, and zero pollutant emission is achieved; and automatic driving can also guarantee the safety speed and automobile distance of the electric automobile during charging driving, and the long-distance driving fatigue of a user is relieved.

The invention provides a coal-fired power generation system based on a bypass flue at the tail part of a boiler as well as warm air obtained through steam extraction. The coal-fired power generation system adopts fuel to heat feed water so as to generate power, and is characterized by comprising a boiler body subsystem, an air supply subsystem, a tail flue subsystem, a turboset subsystem and a generator, wherein the boiler body subsystem comprises the boiler and a boiler flue, the boiler is provided with a hearth, and the boiler flue is connected with an outlet of the hearth and divided into a main flue and the bypass flue; the air supply subsystem comprises an air feeder, a front air preheater and a flue air preheater, the air feeder is used for supplying environment cold air, the front air preheater is connected with the air feeder and used for preheating the environment cold air to obtain warm air, and the flue air preheater is arranged in the main flue and used for heating the warm air; the tail flue subsystem comprises a high-pressure feed water heat exchanger and a low-pressure condensed water heat exchanger, the high-pressure feed water heat exchanger is arranged in the bypass flue and close to an inlet of the bypass flue, and the low-pressure condensed water heat exchanger is arranged in the bypass flue and close to an outlet of the bypass flue.

The invention provides a reactive compensation configuration method based on a reactive voltage feature for a wind power 500kV collecting transformer substation. The method comprises the following steps: determining the access capacity and access position of wind power accessing a power grid; determining inductive reactive compensation capacity and capacitive reactive compensation capacity needed by the power grid; determining the type and the capacity of reactive compensation equipment; determining a coordination control strategy of the reactive compensation equipment; detecting the stability of a wind power grid-connected system. By adopting the method, a reactive compensation configuration scheme is determined for the 500kV collecting transformer substation, so that a technical line is provide for the reactive compensation configuration scheme of the 500kV collecting transformer substation after the wind power accesses the power grid, and stable running after wind power grid connection is ensured.

The present invention relates to a multi-dimensional evaluation-based power transmission line risk evaluation system and an evaluation method thereof. The evaluation system comprises a monitoring subsystem for each unit of a power transmission line, a multi-dimensional evaluation subsystem for each unit of the power transmission line, a risk index calculating and sorting subsystem for each unit of the power transmission line, a power transmission line comprehensive risk evaluation system and a computer. According to the technical points of the evaluation method, a multi-dimensional evaluation method for each unit of the power transmission line is constructed in four aspects: namely the fault occurrence possibility of a unit event, the fault severity of the unit event on the line at the same level, the error code unpredictability of the unit monitoring information, and the fault possibility of the unit event on the line at the next level. Furthermore, the operation risk state of the power transmission line at each level can be comprehensively evaluated. Based on the system and the method, the risk state of each unit of the power transmission line can be timely found out and accurately judged. Moreover, the overall operation risk state of the power transmission line at each level can be comprehensively and overally reflected.

The invention provides an energy storage control system and a method thereof. The energy storage control system comprises an AC / DC rectification module, an isolation transformer, a bidirectional DC / DC conversion module, a switch circuit and a first super capacitance module group. When a power grid has a fault and power outage is generated, the first super capacitance module group provides power for a direct current load through a conducted switch circuit. After a voltage is decreased into a first preset scope and the switch circuit is disconnected, through the bidirectional DC / DC conversion module, the first super capacitance module group continuously provides power for the direct current load. The first super capacitance module group possesses advantages that a service life is long, charging time is short and a operational temperature range is wide so as to be suitable for being a stand-by power supply of the energy storage control system. And the first super capacitance module group is directly connected to the direct current load through a power supply line with a low impedance so that power supply losses are reduced and power supply efficiency is increased. After the voltage is decreased, the bidirectional DC / DC conversion module amplifies the voltage and then provides for the direct current load so as to satisfy a voltage demand of the direct current load and increase the power supply efficiency.

The invention provides a secondary power supply system for blade server; the system adopts AC-DC or DC-DC system power supply as first power supply and outputs single 12V voltage, and adopts DC-DC on each function unit of the system as secondary power supply and finishes effective system power supply through two-level power supply; the system structure includes that: (1) a first power supply unit; (2) a secondary power supply unit; (3) a first-secondary power supply interconnection unit; wherein, (1) the first power supply unit is the basis of the system structure and controls the conversion of standard AC or DC power supply; (2) the secondary power supply unit is used for converting the first voltage into other voltage required by system modules; (3) the first-secondary power supply interconnection unit is a circuit for connecting the two-level power supply system.