114 results about "Reactive energy" patented technology

The invention relates to a method for forming an electric energy metering simulation system and a device thereof, which are used for real-time simulation research on reactive electric energy metering, power grid harmonics analyzing, power grid harmonics electric energy metering and signal processing in electric energy metering, energy meter comparison and energy meter performance test, and are applicable to power grid electric energy metering field to solve the problems of absence of special electric energy metering simulation research means and devices, incapability of developing electric energy metering theories, meter operating principles, comparison and the like in the above researches. The method for forming an electric energy metering simulation system is characterized by comprising the steps of constructing a metering algorithm model library, an electric energy metering visualized interface, a standard source model library, a MATLAB software platform, a DSPACE real time system, a standard source signal, a GSP module, a signal conditioning circuit, a sensor and an actual load. The formation method provides open search means for electric energy metering basic theories, and can form a visual energy meter, an electric energy metering simulation and field replaying system and an electric energy meter comparison device respectively by selecting specific modules in the electric energy simulation system.

An improved method for analyzing power systems; in particular, power systems that may incorporate distributed energy resources (DER), that provides a thorough determination of the potential for network performance improvement that DER could provide, independent of non-network benefits DER could provide. The method incorporates an Energynet dataset simulating the power system, integrating transmission and distribution elements together and capable of evaluating the impacts of additions of real energy sources and/or reactive energy sources anywhere in the network. Such energy source additions are evaluated for their impact on a broad set of performance measures. The specific DER projects that would realize that potential improvement in network performance are characterized as an Optimal DER Portfolio. Network performance improvement attributable to the Optimal DER Portfolio is quantified in engineering and financial terms.

A fast power switch comprises one or more field-effect transistors, such as pull-up and pull-down transistors, that are coupled to a load. Respective driver electronic circuits for each of the field-effect transistors include parallel first and second drivers with a shared driver output coupled to a gate of the field-effect transistor. The first and second drivers are operative to switch the shared driver output for the appropriate field-effect transistor in response to a transition (e.g., low-to-high or high-to-low) at a driver input terminal. A control circuit enables the stronger second driver in response to a transition at the driver input terminal and subsequently disables the second driver once a transition threshold at the gate of the field-effect transistor(s) is crossed. The weaker first driver is sized to damp reactive energy at the load to minimize ringing.

The invention discloses a judgment method for misconnection of a three-phase three-wire electric energy meter, and belongs to the field of measurement. The method comprises the steps of determining whether connected relation of each connection terminal of a three-phase active electric energy meter or a three-phase reactive electric energy meter is correct according to the steering of the three-phase active electric energy meter and the three-phase reactive electric energy meter for a balanced and symmetrical three-phase load, conducting vector analysis according to actual connection, obtaining a calculation expression of actual active power and reactive power, and obtaining an influence of a metering error. A cause for a connection error can be found rapidly by conducting the vector analysis according to the actual connection and through the steering relation of the active electric energy meter and the reactive electric energy meter; the cause for the connection error can be judged by simple comparison; and the method is conveniently mastered by field staff and easy to popularize, and can be extensively used in the field of electric energy metering management.

The invention discloses a method for automatically recording pressure loss leakage electric energy in three-phase three-wire electrical metering, and is characterized in that: (1) the voltage and current signals of the load circuit are collected; (2) a sample/hold circuit samples the alternating current signals of voltage and current in each period; (3) digital quantity is converted to access a data memory through an A/D converting circuit; (4) a logical operation circuit calculates actually calculated active energy W and actually calculated reactive energy Q; (5) whether three phases have any phase to be disconnected is judged; (6) if the phase is disconnected, the logical operation circuit further records the calculated active energy W and reactive energy Q when disconnection in the step (4); simultaneously, the active energy W' and reactive energy Q' of load consumption are calculated according to principle of shifting; (7) the active energy W'-W and reactive energy Q'-Q of leakage are calculated when disconnection; the invention further discloses an electric energy meter, and is characterized in that the electric energy meter comprises a collection data circuit of the electric energy meter, the sample/hold circuit, the A/D converting, the original data memory and the logical operation circuit that are connected in turn. The invention solves the problem of remedying pressure loss leakage electric energy in three-phase three-wire electrical metering, thereby improving the accuracy of remedying pressure loss leakage electric energy and combining the recorded pressure loss leakage electricity meter with the electric energy meter.

The invention relates to an electric energy accurate measurement method and an electric energy accurate measurement device under a fluctuating load. The electric energy accurate measurement method comprises the steps that voltage and current analog quantities are subjected to analog-to-digital conversion of an AD (analog-to-digital) conversion chip and then connected to an instantaneous power calculator; the instantaneous power calculator adopts a dot product multiplier to calculate a relation among instantaneous power, voltage and current at a moment k; the instantaneous power is connected to a single-period time window integrator; the single-period time window integrator integrates and then outputs single-period average power; and the single-period average power is connected to a pulse transmitter and an electric energy accumulator so as to carry out accumulation of electric energy pulse output and positive and negative active/reactive power. By adopting the method and the device provided by the invention, accurate electric energy measurement can still be ensured under the condition that the load current amplitude fluctuates rapidly along with the time.

The invention relates to a rotary motive seal type microwave leakage prevention device which comprises a microwave source cavity (1) and a material conveying roller (6), wherein the microwave source cavity (1) is installed on a rack; the rotatable material conveying roller (6) transversely passes through the middle of the microwave source cavity; the material conveying roller (6) is in matched installation with the microwave source cavity (1) by a sleeve (7) which is sheathed on the external surface of the material conveying roller (6); an annular reactive energy leakage suppressor and an annular resistive energy leakage suppressor are subsequently sheathed from inside to outside; one side of the annular reactive energy leakage suppressor is connected with a side plate at the external end of the microwave source cavity; a wave absorption filler ring (4) is installed in the annular reactive energy leakage suppressor and is pressed by a junk ring (8); the annular reactive energy leakage suppressor is connected with the junk ring; a wave absorption seal ring (5) is installed in the junk ring (8); the annular reactive energy leakage suppressor, the annular resistive energy leakage suppressor and the junk rings form a microwave leakage prevention structure. According to the device provided by the invention, the microwave seal of rotary microwave drying equipment can be realized, and the microwave leakage quantity can be effectively controlled.

The invention provides a PtNi/C bimetallic catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) adding pretreated activated carbon into a nitric acid solution, heating to a temperature of 75-85 DEG C, uniformly stirring, filtering and washing the activated carbon until the pH value is 7, and drying the washed activated carbon; (2) adding the activated carbon into deionized water, sequentially adding chloroplatinic acid and nickel nitrate to be uniformly stirred so as to obtain a catalyst precursor solution, centrifuging the catalyst precursor solution, and drying to obtain a catalyst precursor; (3) reducing the catalyst precursor in a hydrogen atmosphere of 400 DEG C for 2 hours, thereby obtaining the PtNi/C bimetallic catalyst. The bimetallic catalyst provided by the invention has large specific surface area and high reaction activity, and is capable of catalyzing selective hydrogenation of furfural in an aqueous phase at a normal temperature, the reaction efficiency is greatly improved, the reactive energy consumption is reduced, aqueous phase catalysis is realized, and the bimetallic catalyst has excellent economic value and environmental protection significance.

The invention relates to an overall error checking method and device of a high voltage electric energy metering device, wherein the device comprises a high-voltage heavy-current testing power source, a checking object, a testing power source stability degree control circuit, a monitoring unit and a benchmark electric energy measuring unit, wherein the high-voltage heavy-current testing power source is used to provide stable and reliable high-voltage heavy-current testing signal; the checking object, which is a high-voltage electric energy metering device, obtains the high-voltage heavy-current signal and generates detecting electric energy value; the testing power source stability degree control circuit is used to detect the amplitude and the phase of the voltage and the current of the high-voltage heavy-current testing signal; the monitoring unit sets needed detecting flow, testing voltage, current and power factor, and obtains the detecting result of the testing power source stability degree control circuit to control the output state of the high-voltage heavy-current testing power source; the benchmark electric energy measuring unit, which obtains the high-voltage heavy-current signal and generates a standard electric energy value, compares the standard electric energy value with the detecting electric energy value at the same time to obtain wattful or wattless electric energy measuring error.

The invention discloses a fiber access type electric energy meter with a function of harmonic detection, so as to accord with the communication standard of an intelligent transformer station. The energy meter mainly comprises (1) a data collection part: a fiber receiving and transmitting module receives a data message, sent by a communication unit, according with the standard, and transmits the data message to an Ethernet PHY controller, and the Ethernet PHY controller carries out frame verification of the received data, removes the frame head and tail and transmits the data to a DSP; (2), a data processing part: the DSP carries out the analysis of the data frame after the DSP receives a data package, obtains sampling data in the data frame, completes the calculation of voltage, current, harmonic waves at all orders and power through employing an FFT algorithm, transmits the sampling data to an MCU, and controls the power pulse output; (3), a data management part: the MCU completes the calculation and management of active electric energy, reactive electric energy and electricity demand; (4), a data communication part: a display module is used for display all data items, and an infrared or 485 communication interface is used for communication transmission and completes the monitoring of operation parameters.

A reactive energy compensator that can be electrically connected to an AC electrical network, including at least one input direct voltage bus, at least one voltage inverter including switches and first and second capacitors having first and second voltages at their terminals, control means for the switches, including computation means capable of generating a target control current, means for combining the target control current and the output current from the inverter, means for transmitting a control signal capable of driving the switches, and correction means for the control signals of the switches, the correction means being capable of adding a balancing current to the target control current, the balancing current being able to correct the target control current so as to reduce the difference between the values of the first and second voltages, the target control current being increased for an even harmonic of the network frequency.

The present invention provides a test device and method for simulating field electric energy measurement.The device for simulating field electric energy measurement is a novel simulating device designed according to the state electric energy meter field standard and DL/T448-2000, includes a real load portion and a virtual load portion in principle.The real load portion is composed of current voltage transformer, second wiring thereof, and electric energy meter, is a single bus double loop, can simulate various real wirings in the field, thus ensuring the accuracy and reliability of the electric energy measurement, and avoiding bringing hidden trouble to the safe operation of the power system.The virtual load is composed of three-phase program control test power supply and voltage, and current wiring switch box, has the characteristics of stability, strong function, easy use and the like, can be used by power supply department, metering department, school and training center for explaining practical phenomena such as false wiring of three-phase three-wire, three-phase four-wire active and reactive electric power meters to students, making the teaching closer to the practical work.

The invention relates to an electronic type multifunctional electric energy meter. A core of hardware is an MCU main controller that is responsible for key input scanning, working state detection, metering data reading in, calculation and storage, on-site configuration of electric meter parameters and control on communication with the external world and the like. Besides, main functional units of the electric energy meter comprise the MCU main control unit, an electric quantity metering module, an RFID communication module, an RS-485 communication module, a calibration module, and an EEPROM storage array; and other auxiliary module consist of a clock calendar circuit, a working abnormity alarm circuit, a key input circuit, a reset control circuit, a power supply module, a large-screen liquid crystal display module and an LED display module. The electric energy meter can simultaneously carry out metering on forward/reverse active electric energy, forward/reverse reactive electric energy, and four-quadrant reactive electric energy; and moreover, the electric energy meter also enables multi-rate control, load curve recording, and voltage losing recording, overvoltage recording, and frequency over-limit recording to be realized.

A device for optimizing the electric power produced by direct current electric power generators, specifically photovoltaic panels, can be interposed between the generators of a string and its inverter and it includes a DC/DC conversion module suitable to implement an algorithm of MPPT, bypass means and a reactive energy compensation module. By measuring the voltage and current at input and output of the device a suitable algorithm activates and manages the above modules to extract from the panels the maximum amount of energy.

The invention relates to a method for monitoring the intelligent state of a medium-voltage switching device, which comprises the steps of collecting voltage and current signals of medium-voltage electric power network, carrying out isolation transform processing, carrying out alternating current sampling, calculating voltage and current effective values, calculating triphrase active power, triphrase total apparent power, reactive power, power factor, active electric energy and reactive electric energy, and carrying out corresponding follow-up monitoring processing operation. The method for monitoring the intelligent state of a medium-voltage switching device has protective function to time overcurrent, current quick-break and single-phrase earthing and has the functions of faults recording and online monitoring and diagnosis. The method can analyze and process the monitored data, judge the remaining service life of the switching device and calculate the maintenance time limit. Furthermore, by connecting and communicating with the monitoring host of a substation comprehensive automatic system, the method is provided with the communication function and simple monitoring function to the state of the switching device. The method has the advantages of simple realization process, lower running cost, stable and reliable working performance and wider application scope.

The present invention provides a voltage sag source positioning method. The voltage sag source positioning method comprises: extracting the instantaneous active power and instantaneous reactive power reactive power variance [Delta]p(t) and [Delta]q(t) during the sag, performing integration obtaining of disturbance active energy [Delta]Ep(t) and reactive energy [Delta]Eq(t); determining whether the [Delta]Ep(t) and the [Delta]Eq(t) are the same number or not; if the [Delta]Ep(t) and the [Delta]Eq(t) are the same number, employing the symbol of the [Delta]Ep(t) to perform voltage sag source positioning; if the [Delta]Ep(t) and the [Delta]Eq(t) are not the same number, determining whether the voltage sag source is a symmetry fault or not; if the voltage sag source is a symmetry fault, employing an equivalent impedance real part positioning method to perform voltage sag source positioning; and if the voltage sag source is not the symmetry fault, calculating a three-phase sag degree similarity P3, and positioning the voltage sag source according to the P3 value. Through integration of three voltage sag source positioning method, the voltage sag source positioning method takes advantages of each voltage sag source positioning method so as to effectively reduce the misjudgment rate of the voltage sag source positioning and improve the reliability of the voltage sag source positioning result.

The present invention relates to an arrangement (10) and a corresponding method for influencing and/or detecting magnetic particles in a region of action (300). To store the required reactive energy a tank circuit (453) is provided, which is preferably operating at the centre frequency of the MPI drive field. Reactive elements (C₄, L₂), in particular capacitors and/or inductors, couple one or more tank circuit (453) to the drive field resonator (454, 220). The coupling strength is preferably varied by switching additional reactive elements (C₅) into and out of the coupling unit (452) to vary the strength of coupling.

The invention provides a method for preparing a lithium metal battery negative electrode supported by a carbon/tin composite substrate. The method comprises the steps of loading tin oxide on a commercial carbon cloth by adopting a hydrothermal reaction, then heating under an inert gas protection condition, performing in-situ formation of metal tin on the surface of the carbon cloth, finally loading heated molten metal lithium on the composite substrate with the metal tin as a lithiophilicity site to obtain an improved lithium negative electrode. The method is characterized in that: the doubleaffinity of the metal tin to the carbon cloth and the metal lithium is used, the defects such as dendrite growth during the cycle of the negative electrode of the metal lithium battery are improved, and the lithium metal battery negative electrode with high cycle stability, high battery capacity and low non-reactive energy consumption is prepared.

A synthetic-frequency RF transmitter is provided for transmitting an electromagnetic signal via an electrically short antenna. The transmitter comprises a reactive energy storage with an effective reactance adapted to form with the antenna a resonance circuit with a resonance frequency and a driver adapted to provide to the resonance circuit an electric transmission signal having an instantaneous frequency that varies in dependence on an information signal. The transmitter is characterised in that the transmitter is adapted to dynamically change the resonance frequency by changing the effective reactance in dependence on the information signal. Thus, the instantaneous pass-band of the resonance circuit may be controlled to substantially always comprise the instantaneous frequency of the electric transmission signal and thus of the electromagnetic signal.

The invention provides an EMU train energy consumption measuring system, and relates to the technical field of energy consumption measurement. The EMU train energy consumption measuring system is usedfor solving the problems that in the prior art various energy consumption measurements and harmonic wave analysis of a multi-point acquisition EMU train cannot be met, wherein the various energy consumptions comprises traction-inputted active energy consumption and reactive energy consumption and active energy consumption of an auxiliary power supply system. The EMU train energy consumption measuring system comprises a voltage transformer, a current transformer, a voltage sensor, a current sensor, and an energy measuring module; the voltage transformer and the current transformer are used formeasuring a first voltage value and a first current value of an alternating current obtained from a power supply network by a traction transformer, the current sensor and the voltage sensor are usedfor measuring a second voltage value and a second current value of a direct current of the auxiliary power supply system outputted from the traction transformer; the energy measuring module is used for combining a preset frequency spectrum analysis algorithm to obtain a traction-inputted preset energy consumption. According to the EMU train energy consumption measuring system, various energy consumptions and harmonic wave components of a train can be obtained during running, and basic data are provided for energy consumption and energy conservation management of the EMU train.

The invention relates to a grid-connected inverter control method and in particular to a single phase grid-connected inverter reactive output control method. The single phase grid-connected inverter reactive output control method is characterized by providing a control unit, the control unit is used for changing control method of the single phase grid-connected inverter according to the fact that whether a power grid has reactive output, when the power grid has no reactive output requirements, the control unit controls the single phase grid-connected inverter to be at a unipolar working mode, and when the power grid has reactive output requirements, the control unit controls the single phase grid-connected inverter to be at a bipolar working mode. The single phase grid-connected inverter reactive output control method overcomes the shortcoming of the single control mode of the single phase grid-connected inverter in outputting reactive energy, achieves accuracy and controllability in outputting target phase position, and achieves adjusting and control of power factors. Under the condition of poor power grid quality, the single phase grid-connected inverter performs certain compensation on power grid waveform through outputting reactive power and has the advantages of being low in loss and high in complete machine efficiency.

The invention relates to a method and device for measuring and controlling the amount of a liquid pumped. The embodiments herein disclose a method and system for measuring and controlling an amount of flow and volume of liquid/fluid and/or electrical energy. The method and system obtains a plurality of values for the electrical parameters of an electro-pump, including voltage value, current value and active/reactive energy value; calculates the plurality values; and determines and controls the amount of instant flow and volume of the liquid/fluid based on the calculated values. The system/method gathers these two measuring and controlling features such as measuring and controlling the volume of liquid and amount of energy in one casing, thereby providing a secure reference for both the parameters at the same time for underground water resources.

The invention provides a high-frequency isolated type boost three-level inverting circuit which is composed of a Boost inverting circuit and a flyback type energy feedback circuit. The Boost inverting circuit is composed of an input direct-current power supply unit, an input filter, a high-frequency inverter, a high-frequency transformer, a frequency converter, an output filtering capacitor and an output alternating-current load which are sequentially connected. A Boost converter can only increase the voltage and can not decrease the voltage, so that the output voltage can not be decreased, and the voltage can not meet the requirement for the output sine waveform. In order to ensure the quality of the output sine waveform in the period and solve the problem of the orientation of reactive energy of the output filtering capacitor and the load, the high-frequency electrical isolation flyback type converter energy feedback circuit is added between the output load and an input power supply. The inverter has the advantages that the number of power conversion stages is small, the number of power switching devices is small, input ripple waves are small, the voltage stress of a power switching tube is low, the dual-directional power stream and high-frequency electrical isolation are achieved, and the spectrum characteristic of the voltage at the front end of the output filter is good.