86 results about "Transformation ratio" patented technology

The present invention relates to the technical field of circuit control, and relates to a direct-current high-voltage generator regulation and control method and system based on intelligent feedback. A fuzzy control logic operation is performed on an output current flux value and an input voltage fluctuation factor of a load experimental object, so as to obtain the disturbance amplitude of a voltage fluctuation state for a current flux change trend; if a step-up transformer can execute a PID control technology by adjusting a transformation ratio, PID real-time adjustment parameters are calculated, and a crossover mutation operation of individuals is performed on the basis of a fitness function, so as to generate a first boost regulation and control scheme; and if the step-up transformer cannot execute the PID control technology by adjusting the transformation ratio, a calibrated state feedback controller is constructed on the basis of a state variable of the current step-up transformer and an adjustment signal output amplitude, so as to generate a second boost regulation and control scheme. The present invention achieves intelligent feedback regulation and control by independently analyzing components of direct-current high-voltage generators, improving the stability and accuracy of outputting high-voltage direct current.

The invention relates to a method for decoupling organic matter primary-secondary cracking hydrocarbon generation conversion rate based on a gold tube hydrocarbon generation thermal simulation experiment. The method comprises the following steps: step 1, acquiring kerogen gold tube hydrocarbon generation thermal simulation experiment data; step 2, parametric modeling of the kerogen hydrocarbon generation process; step 3, constructing a least square target model under a multi-constraint condition; step 4, performing nonlinear least square optimization solution under the constraint condition; and 5, calculating the hydrocarbon generation conversion rate. According to the method, conversion rate calculation is carried out on the cumulant of each hydrocarbon generation process obtained through decoupling, the conversion rate evolution rule of the kerogen oil generation, gas generation, crude oil cracking gas generation, non-reactive carbon formation and other processes along with maturity change in the crude oil cracking process can be obtained, and a quantitative basis is provided for refined hydrocarbon generation evaluation.

The invention relates to a method for decoupling organic matter primary-secondary cracking hydrocarbon generation conversion rate based on gold tube hydrocarbon generation thermal simulation-solid product pyrolysis experiment. The method comprises the following steps: step 1, kerogen gold tube hydrocarbon generation simulation and solid product rock pyrolysis experiment data acquisition; step 2, parametric modeling of the kerogen hydrocarbon generation process; step 3, constructing a least square model of multi-source experimental information collaborative constraint; 4, carrying out optimization solution under a multi-source experiment information collaborative constraint condition; and 5, calculating the hydrocarbon generation conversion rate. According to the method, conversion rate evolution characteristics of each hydrocarbon generation process are quantitatively represented, conversion rate calculation is performed on cumulant of each hydrocarbon generation process obtained through decoupling, and conversion rate evolution rules of kerogen oil generation, kerogen gas generation, crude oil cracking gas generation, non-reactive carbon formation and other processes along with maturity changes in the crude oil cracking process can be obtained; and a quantitative basis is provided for refined hydrocarbon generation evaluation.

The invention provides an electric shock fault detection method and device, equipment, a storage medium and a program product. The method comprises the following steps: acquiring residual current and repeated grounding point current of the low-voltage power distribution network in a first measurement period; extracting a first harmonic amplitude of the residual current and a second harmonic amplitude of the repeated grounding point current; determining a transformation ratio according to the first harmonic amplitude, the second harmonic amplitude, a third harmonic amplitude corresponding to the residual current in the second measurement period and a fourth harmonic amplitude corresponding to the repeated grounding point current in the second measurement period; the second measurement period is a previous measurement period of the first measurement period; and detecting whether the low-voltage distribution network has an electric shock fault according to the transformation ratio. The method is used for achieving the effect of improving the electric shock fault detection reliability.

The invention discloses a voltage transformer field calibration system and a state diagnosis method, and relates to the technical field of power equipment detection, and the method comprises the following steps: measuring the primary voltage and secondary voltage of a standard voltage transformer, and calculating the transformation ratio of the voltage transformer and the phase difference of the standard voltage transformer; obtaining the secondary voltage of the voltage transformer, and combining the primary voltage of the voltage transformer to obtain the phase difference of the voltage transformer; calculating a voltage error rate according to the secondary voltage of the standard voltage transformer and the secondary voltage of the voltage transformer, constructing a comprehensive calibration index model, and obtaining a field calibration coefficient of the voltage transformer; and acquiring working state data of the voltage transformer, constructing a state diagnosis model by adopting a support vector machine algorithm in combination with the field calibration coefficient of the voltage transformer to obtain a state diagnosis coefficient, performing comparative analysis on the state diagnosis coefficient and a state diagnosis threshold value, and diagnosing whether the state of the voltage sensor is abnormal or not. The method further improves the verification precision, and solves a problem that a conventional measurement and calculation method is large in error.

The invention discloses a method for on-line identification of the electricity stealing behavior of a high-voltage power supply and high-voltage metering special transformer user, and the method comprises the following steps: (1) collecting the real-time data of the primary side current of a power supply incoming line through power distribution automation equipment, collecting the secondary side current data according to a metering collection device, and determining the change trend of the real-time data according to the two data; (2) judging whether the current is abnormal or not according to the real-time data change, representing the primary side current by i1, representing the secondary side current by i2 and representing the transformation ratio data of the current transformer by k, and formulating an error coefficient; (3) analyzing according to real-time hourly data every day, if delta is greater than 20% in the same period, indicating that electricity stealing suspicion exists, and if delta is greater than 20%, indicating that the electricity stealing suspicion exists. The information is automatically sent to related workers for evidence obtaining and investigation on site; and (4) taking the next group of real-time data for analysis and calculation. According to the invention, the electricity stealing behavior of the high-voltage power supply and high-voltage metering special transformer user is identified online for the first time, and the problem that the electricity stealing investigation of the special transformer user is passive for a long time is solved.

The invention provides an intelligent interface matrix for an integrated test of a power transformer, and aims to simplify complex wiring operation in a traditional test and improve the automation level and the working efficiency of test wiring of the power transformer. The intelligent interface matrix is composed of an intelligent control module, a test interface unit and a sensing monitoring module, and supports wiring tasks of conventional tests of dielectric loss, excitation characteristics, loop resistance, primary and secondary DC resistance of a current transformer, transformation ratio, dielectric loss, insulation resistance and the like of a voltage transformer. Signals such as voltage and current in a test are monitored in real time, the intelligent interface matrix automatically identifies the type of the power transformer, a test sequence is preset according to different types of transformers, a plurality of adjustable test interface units are stably and safely switched in a high-voltage and large-current environment, various test wiring work is efficiently and rapidly completed, and the test efficiency is improved. Manual intervention is remarkably reduced, and the test safety, reliability and overall working efficiency are effectively improved.

The invention relates to a reactive distillation device and method for automatically separating phases and refluxing to a reaction section, and belongs to the technical field of chemical reaction and separation coupling. The reactive distillation tower (1) sequentially comprises a distillation section (11), a reaction section (12) and a stripping section (13) from top to bottom, the tower bottom of the reactive distillation tower (1) is connected with a heater (2), the tower top of the reactive distillation tower (1) is sequentially connected with a tower top condenser (3) and an automatic phase splitter (4) through pipelines, materials are condensed by the tower top condenser (3) to form a water phase and an oil phase which are not completely mutually soluble, and the water phase and the oil phase are separated from each other. After automatic phase splitting in the automatic phase splitter (4), the water phase automatically and continuously flows into a water phase collecting tank (5) from the upper part of the automatic phase splitter (4), the oil phase automatically and continuously flows out from the lower part of the automatic phase splitter (4), one part of the oil phase returns to the rectifying section (11) through the reflux ratio controller (6), and the other part of the oil phase returns to the rectifying section (11) through the reflux ratio controller (6); one part of the gas automatically flows back into the reaction section (12) by virtue of the liquid level to continuously react, so that a high-purity product is obtained in the tower kettle. The device is simple in structure and control method and convenient to operate, unreacted raw materials are rectified and then automatically flow back into the reaction section in a split-phase mode to participate in the reaction again, the raw material utilization rate is increased, the reaction conversion rate is high, and a water phase and an oil phase can be automatically extracted in a split-phase mode and flow back.

The application relates to a method for decoupling primary-secondary cracking hydrocarbon generation conversion rates of organic matter based on a gold tube hydrocarbon generation thermal simulation-solid product pyrolysis experiment, which comprises the following steps: step 1, kerogen gold tube hydrocarbon generation simulation and solid product rock pyrolysis experiment data acquisition; step 2, parameterized modeling of the kerogen hydrocarbon generation process; step 3, construction of a least square model cooperatively constrained by multi-source experimental information; step 4, optimization solution under the cooperatively constrained condition of multi-source experimental information; and step 5, hydrocarbon generation conversion rate calculation. The application quantitatively characterizes the conversion rate evolution characteristics of each hydrocarbon generation process, and through conversion rate calculation on the cumulative amount of each hydrocarbon generation process obtained by decoupling, the conversion rate evolution law of the kerogen oil generation, gas generation and oil cracking process, the oil cracking gas formation and the unreactive carbon formation process with the change of the maturity can be obtained, and a quantitative basis for fine hydrocarbon generation evaluation is provided.

The application relates to the technical field of metrological calibration, and discloses a multi-voltage-grade capacitor current tester calibration method based on unified transformation ratio. The method comprises the following steps: screening unified transformation ratio parameters meeting range constraints and error constraints, obtaining a ratio difference parameter of a corresponding electromagnetic voltage transformer, obtaining a capacitance ratio difference correction factor, calculating conversion coefficients under each voltage grade, determining a primary side capacitance setting value according to a preset primary side calibration capacitance value and the conversion coefficients, obtaining a secondary side output capacitance value of a standard capacitance tank, and collecting a displayed capacitance value and a displayed capacitance current value. The conversion coefficients between the unified transformation ratio and the theoretical transformation ratios of each voltage grade are established, single transformation ratio is used to cover multi-voltage-grade calibration, error components introduced by the ratio difference of the electromagnetic voltage transformer in the capacitance calibration process are reduced, and different transformation ratio equipment needs to be frequently replaced.

The invention provides an efficient in-situ conversion synergistic hydrogen production method for shale oil with medium and low maturity, and belongs to the technical field of shale oil application. An upper-middle-lower three-well layout system is established, a hydrogen separation membrane layer is welded to a hydrogen production well, electric heating is matched with a conductive proppant to form an artificial fracture network, and a temperature field prediction model is adopted to dynamically regulate and control the heating power based on an artificial intelligence algorithm to maintain the optimal temperature; and an air slug and a steam slug are circularly injected to realize oxidation heat supply to promote organic matter cracking and gasification reaction with coke and other byproducts to produce hydrogen, an injection strategy is adjusted according to the ratio of the oxygen consumption rate to the coke gasification rate, and underground hydrogen separation is realized by virtue of a gravity differentiation effect and a hydrogen separation membrane. The method effectively solves the problem of low conversion rate in the in-situ conversion of the shale oil with medium and low maturity, and realizes clean and efficient underground hydrogen production.

The invention provides a pole-mounted vacuum circuit breaker and a control method thereof, and relates to the technical field of power distribution equipment of a power system. The pole-mounted vacuum circuit breaker comprises a circuit breaker body, a multi-transformation-ratio current transformer and an isolation module, and further comprises an automatic transformation ratio adjustment module which comprises a change-over switch and a first motor used for driving the change-over switch to switch taps; the electric on-off isolation module comprises a motor module used for driving the isolation module to act; and the central control unit is electrically connected with the first motor and the motor module, and is used for controlling the first motor to act according to the line load change so as to automatically switch the transformation ratio of the mutual inductor, and controlling the motor module to act according to an instruction so as to realize electric closing and opening of the isolation module. On the basis, the problems that an existing pole-mounted vacuum circuit breaker cannot adjust the transformation ratio of a mutual inductor in time according to the load requirement, and the isolation function depends on manual operation are solved.

The invention relates to the technical field of online monitoring of electric energy metering equipment, in particular to an anti-disturbance current transformer transformation ratio anomaly identification method and system, and the method comprises the following steps: obtaining line loss in a target line and electric energy increment corresponding to an energy supply transformer and an energy consumption transformer; establishing an energy conservation matrix by using line loss and electric energy increment, introducing anti-disturbance parameters into the energy conservation matrix to establish a target function, and solving the target function by using a differentiation creative search algorithm to obtain a transformation ratio of a current transformer corresponding to the energy supply transformer and a current transformer corresponding to the energy consumption transformer; and obtaining archive transformation ratios of the current transformers corresponding to the energy supply transformer and the energy consumption transformer, respectively calculating difference values between the transformation ratios and the corresponding archive transformation ratios, and carrying out transformation ratio abnormity identification on the current transformers based on a difference value calculation result. According to the method, the stability of transformation ratio solving can be effectively improved while rapid positioning of the abnormal current transformer is achieved, and precision reduction caused by noise or numerical errors is reduced.

The invention discloses a residual sensitivity matrix-based power distribution network parameter anomaly positioning and correction method. The method comprises the following steps of: determining the type of each branch of a power distribution network and then obtaining a to-be-checked parameter of each branch; obtaining actual values of active power and reactive power of each branch in the power distribution network; obtaining conductance and susceptance of each branch, calculating theoretical values of active power and reactive power of each branch according to the conductance and susceptance of each branch and the to-be-checked parameter data, and calculating an active power residual error and a reactive power residual error of each branch; constructing a sensitivity matrix and a measurement residual vector, establishing a regular equation through the sensitivity matrix and the measurement residual vector, and solving the regular equation to obtain a line length deviation value and a transformer transformation ratio deviation value; and correcting the line length and the transformer transformation ratio. According to the invention, high-precision, anti-interference and stable identification of the line length and the transformation ratio of the transformer is realized.

The invention belongs to the technical field of power system relay protection and power distribution network flexible interconnection, and discloses a flexible loop closing device body topological structure, which comprises a double-core symmetric phase-shifting transformer and a mode switching interface unit, and is characterized in that the double-core symmetric phase-shifting transformer comprises an exciting transformer bank and a series transformer bank; the mode switching interface unit is arranged on a low-voltage electric energy coupling loop between the secondary side output end of the exciting transformer bank and the secondary side input end of the series transformer bank, and the mode switching interface unit is arranged on a low-voltage electric energy coupling loop between the secondary side output end of the exciting transformer bank and the secondary side input end of the series transformer bank. And the current-limiting impedance of the secondary side is mapped to the primary side by the square times of the transformation ratio, so that on the premise of not increasing the volume and cost of the external current-limiting reactor, the self-protection and fault current suppression of the body are realized, and the organic unification of steady-state current regulation and transient current limiting is realized. The invention also discloses a virtual impedance identification-based adaptive protection method matched with the topological structure of the flexible loop closing device body.

The invention relates to the technical field of power supply control, and discloses a current space vector decoupling control method, system and device for a dual-active bridge type single-stage AC-DC converter and a medium, and the method comprises the steps: enabling the dual-active bridge type single-stage AC-DC converter to be equivalent to two independent dual-active bridge type DC-DC converters in a control period, an alternating current side three-phase current synthesis vector is decomposed to calculate an input average current, a duty ratio is determined in combination with parameters such as an input line voltage and an instantaneous voltage transformation ratio, a switch tube action logic is generated, and a current space vector decoupling modulation strategy is realized. According to the method, the problem of alternating current side transmission current distortion is solved, the actual alternating current side transmission current of the system approaches a given value more accurately, and grid side current distortion is reduced. And meanwhile, the action logic of a switching tube is accurately controlled, the internal circulation of the converter is reduced, the system efficiency is improved, the buck-boost characteristic of the dual-active bridge type single-stage AC-DC converter is exerted, and the actual requirement of an AC grid-connected energy storage system is better met.

The invention relates to a current transformer capable of automatically switching the transformation ratio and an automatic transformation ratio switching method, and belongs to the technical field of current transformers, the current transformer comprises a current transformer body, and a secondary winding of the current transformer body is provided with at least two groups of output taps with different transformation ratios; the current detection unit is used for sampling primary side current in real time and calculating an effective value; the transformation ratio switching execution unit is connected to the output tap and used for changing the effective turn ratio connected to the measurement loop; the intelligent control unit is electrically connected with the current detection unit and the transformation ratio switching execution unit; and the protection unit is used for preventing a secondary side open circuit of the current transformer body in the transformation ratio switching process and in an abnormal state. The optimal transformation ratio is dynamically calculated in combination with current real-time and historical data, the transformation ratio switching execution unit is driven to automatically adjust the effective turn ratio of the secondary winding, and the problem that the measurement precision of a traditional current transformer is reduced due to the fixed transformation ratio in a wide load range is solved.

The invention belongs to the technical field of relay protection equipment, and particularly relates to a verification method for verifying a differential protection action curve of YN and yn0 starting and standby transformers. The method comprises the following steps: firstly, converting current values of differential current and brake current into per unit values, and selecting different brake current action per unit values to obtain different differential current action per unit values according to an action equation of differential protection action characteristics; then, an action critical point is found through calculation, an action area and a non-action area are obtained by changing IA and Ia values output by the protection tester, and then an action characteristic curve is obtained and verification is completed; according to the invention, a method of converting named value calculation into per unit value calculation is adopted to simplify the process of searching the critical point of the differential action, and the verification of the whole differential action curve is completed by changing the transformation ratio of the two sides of the transformer set by the device. According to the method, verification protection of the action characteristic curve can be realized, and the current output by the tester cannot be exceeded.

The present invention provides a combined process method for treating coal tar, which comprises the following steps: (1) coal tar raw material enters a fractionation unit to obtain light distillate oil and heavy distillate oil; (2) the light distillate oil obtained in step (1) is mixed with a first hydrogen stream and then enters a microbubble generator to obtain a first mixed stream; the heavy distillate oil is mixed with a second hydrogen stream to obtain a second mixed stream; (3) the first mixed stream and the second mixed stream obtained in step (2) respectively enter an ebullating bed hydrogenation reaction zone through a gas-liquid distribution plate, undergo hydrogenation reaction in the presence of hydrogen, and the reaction effluent is subjected to gas-liquid separation to obtain a gas phase effluent and a liquid phase effluent; (4) the liquid phase effluent obtained in step (3) enters a fixed bed hydrogenation reaction zone, and the reaction effluent is separated to obtain products such as liquefied gas, naphtha, and crude white oil. The method has a high hydrogenation conversion rate and low production cost, and can also inhibit the condensation and coking reaction of unsaturated olefins contained in the coal tar, thereby achieving long-term stable operation of the device.

The present application discloses a pulse transformer that combines high transformation ratio with fast pulse output capability, relating to the technical field of pulse transformers. The transformer comprises an insulating core, a variable impedance wire, and an insulating film wound around the insulating core. The variable impedance wire has a gradually varying width corresponding to the transformation ratio and transmission requirements. The present application has the beneficial effect of gradually varying the variable impedance wire as a conductive layer on the pulse transformer to achieve impedance change. This impedance change causes multiple reflections and transmissions during electromagnetic wave propagation, thereby compressing the pulse width. This allows the pulse transformer to have both high voltage boost capability and fast pulse output capability.

The invention relates to a transformation ratio detection method for a low-voltage step impact type mutual inductor. The method comprises the following steps: S1, obtaining the representation of the transformation ratio N of the mutual inductor based on five basic parameters; s2, obtaining five basic parameters of the transformation ratio N of the mutual inductor; and S3, obtaining a basic parameter calculation formula of the transformation ratio N of the transformer. The transformer body is abstracted into the transfer function mathematical model, the transformation ratio of the transformer body is obtained according to the two-port transfer function of the transformer system, and the field problems that in existing transformer transformation ratio detection, personal risks are high, equipment is expensive, the weight is large, and damage is prone to occurring are solved.

The utility model relates to a multi-transformation ratio current transformer test tool, which is used for carrying out turn-to-turn overvoltage, FS / ALF and error tests on a secondary winding of a transformer, and comprises a first output unit, at least one second output unit, a third output unit and at least one fourth output unit. The device has the advantages that the device is compact in design and convenient to move, and when the turn-to-turn overvoltage, FS / ALF and error tests of the multi-transformation-ratio current transformer are tested, only primary and secondary winding wiring needs to be connected, so that the trouble of changing and wiring for multiple times at each transformation ratio is avoided; the tool is high in efficiency, stable in work, not prone to damage, standardized in component and easy to maintain, and the problems that traditional work is complex in operation, poor in stability, difficult to maintain and the like are solved.

The application discloses a kind of solid oxide fuel cell power generation system residual life prediction methods, suitable for with methane as fuel, belongs to fuel cell life prediction technical field.The prediction method of the application includes the following steps: continuously operating test is carried out to SOFC, obtains the change data of voltage or power with time and calculates attenuation rate, and obtains the conversion rate of reforming curve of change with time, establishes system overall performance attenuation prediction model and reforming reactor performance attenuation prediction model, then according to the data of having served stage, the future attenuation trend of the stack is predicted, and the residual life of the stack is predicted according to the defined failure threshold;The prediction method of the application can realize the residual life on-line prediction of solid oxide fuel cell power generation system, and the prediction method is simple, reliable, practical, suitable for the rapid prediction of the residual life of field power generation system, and has important significance for the health management of the solid oxide fuel cell power generation system in operation.

The present invention discloses a method for optimizing the structure of a high-efficiency diesel hydrogen reformer, belonging to the technical field of reformer optimization design. The method comprises the steps of: establishing a multi-physics field model of the reformer in finite element software; determining the main structural parameters that affect the reforming efficiency of the diesel hydrogen reformer; using the multi-physics field model to obtain the reforming conversion rate, H2 output rate, thermal efficiency, and CO output rate of the diesel hydrogen reformer under different structural parameters as performance evaluation indicators of the diesel hydrogen reformer, and selecting structural parameters that can increase the reforming conversion rate and H2 output rate of the diesel hydrogen reformer and / or reduce the CO output rate. Based on the improvement of the heating structure of the existing reformer, the present invention analyzes the main structural parameters that affect the reforming efficiency of the diesel hydrogen reformer, uses finite elements to establish a multi-physics field model, and optimizes the structural parameters of the improved reformer, thereby obtaining a diesel hydrogen reformer with a high reforming conversion rate.

A power converter includes a piezoelectric transformer comprising a piezoelectric material and metalized electrodes that form two or more ports, at least one of the two or more ports being an input port having an input port surface area, at least one of the at least two ports being an output port having an output port surface area, wherein, the piezoelectric transformer has a physical characteristic of a geometry term H comprised of piezoelectric transformer dimensions at least one of input port and output port measurements, including and a voltage swing across the input port, a voltage swing across the output port, a charge utilization at the input port, a charge utilization at the output port, an input voltage, an output voltage, and a transformation ratio.

The invention discloses a method for on-line identification of metering anomalies of a special transformer district and a public transformer district of a medium-voltage branch line, and the method comprises the following steps: (1) collecting the data of the primary side current of an outgoing line of the medium-voltage branch line through power distribution automation equipment; meanwhile, according to the secondary side current data, collected by the main metering collection device, of all the special transformer and public transformer metering devices under the branch lines, the real-time data change trend is determined by combining the transformation ratio data of the current transformers of the special transformer and public transformer districts; (2) judging whether the secondary current is abnormal or not according to the real-time data change, and (3) in the same period, if delta is greater than 10%, indicating that the secondary side current of the special transformer or the public transformer under the branch line is abnormal, and automatically assigning the abnormal medium-voltage branch line to related workers by the system. According to the invention, the online identification of the metering abnormity of the special transformer and public transformer districts on the medium-voltage branch lines is realized for the first time, and the problem that the abnormal special transformers and public transformers cannot be identified in time due to the large number of medium-voltage branch lines and the large number of special transformers and public transformers for a long time is solved.

The invention relates to the technical field of power supply phase shift voltage regulation, in particular to a double-input vector fine phase shift method, device and equipment for a GIS same-frequency and same-phase voltage withstand test, and the method comprises the steps: firstly, determining a three-phase test power supply, selecting a two-phase power supply from the three-phase test power supply, and then respectively connecting the selected two-phase power supply to independent voltage regulators; the output end of one voltage regulator is connected to the positive end of the primary winding of the exciting transformer, the output end of the other voltage regulator is connected to the negative end of the primary winding of the exciting transformer, finally, a reference signal is obtained, the transformation ratio of the voltage regulators is adjusted, and the exciting transformer outputs voltage consistent with the reference signal in phase. The device solves the problems of high cost, low reliability and harmonic pollution generation in the prior art, and has the beneficial effects of high reliability, quick response, low cost, no harmonic pollution and simple structure.

1. The name of the design product: high-voltage solid-enclosed pole mutual inductor. 2. The use of the design product: mainly to transform large current into small current according to the corresponding transformation ratio for protection and metering. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view. 5. The rear view is symmetrical with the front view, and the rear view is omitted.

The invention provides a self-adaptive differential protection method and device for a gravity energy storage unit. The method comprises the following steps: acquiring a closing auxiliary contact state of a power generation circuit breaker and an electric circuit breaker in the gravity energy storage unit; collecting a power generation side current, an electric side current and a neutral point current in the gravity energy storage unit, and calculating effective values of the power generation side current, the electric side current and the neutral point current; determining a balance coefficient based on the closing auxiliary contact state and a preset current transformer transformation ratio, wherein the balance coefficient comprises a power generation side balance coefficient and an electric side balance coefficient; generating a differential current according to the effective value and the balance coefficient; and when the differential current exceeds a preset threshold value, triggering a protection action. According to the invention, through multi-dimensional current acquisition and balance coefficient dynamic adjustment, full space-time differential protection is realized in combination with the state of the circuit breaker, and the reliability and sensitivity of gravity energy storage unit protection are improved.

The invention relates to a rectifier arrangement for hydrogen electrolysis, comprising a transformer (1) with a primary winding (2) for connecting an input alternating voltage and a secondary winding (3) for providing an output alternating voltage, and comprising a rectifier (4) connected to the secondary winding (3) for generating an output direct current IDC and an output direct voltage UDC, wherein at the primary winding (2) of the transformer (1) a number N>1 of winding taps (5) are provided, and a load stage switch (6) connected to a controller (7) is provided which is designed for switching the winding taps (5) without interruption such that the transformation ratio of the transformer (1) can be switched via the controller (7) in N stages.