94 results about "Electromagnetic power" patented technology

The invention belongs to the technical field of electromagnetic induction and friction nanometer power generation, and particularly relates to a vibration energy collector based on electromagnetic induction and friction nanometer hybrid power generation. Comprising a friction nanometer power generation unit and an electromagnetic induction unit. The friction nanometer power generation unit comprises an upper insulating support plate, a lower insulating support plate and a friction pair; the friction pair comprises an upper friction assembly and a lower friction assembly, and the upper friction assembly and the lower friction assembly trigger the contact and separation process through external vibration to achieve friction electricity generation. The electromagnetic induction unit comprises a coil, a magnet and a steel body which are sequentially nested, the coil and the magnet are fixedly connected with the upper friction assembly and the lower friction assembly respectively, the steel body is fixedly connected with the lower insulation supporting plate, the magnet and the steel body form a closed magnetic circuit, and the magnet and the coil trigger relative movement through external vibration to achieve electromagnetic power generation. The device is novel in structure and distinct in gradation, integrates a triboelectrification effect and an electromagnetic induction principle, has high-voltage output and high-current characteristics, and can efficiently realize continuous conversion from environment vibration energy to electric energy.

The invention relates to an optimal power capturing method for a wave energy power generation device of a mixed-flow type air turbine, and belongs to the field of wave energy power generation. The optimal power capturing method comprises the steps that the change condition of the average output power of the turbine under different sea conditions along with the rotating speed is tested, and the maximum average output power point of the turbine under each sea condition is obtained; fitting the maximum average output power point under each sea condition to obtain a control law of the electromagnetic power of the motor; the quadrature-axis current reference value of the stator is made to be equal to zero, and the direct-axis current reference value of the stator is calculated; calculating a stator quadrature-direct axis current error term, and establishing a positive definite Lyapunov function; deriving the Lyapunov function, substituting the Lyapunov function into a stator quadrature-direct axis current state equation, and then performing transformation according to a first stability theorem to obtain a stator quadrature-direct axis voltage control law; and generating a corresponding SVPWM (Space Vector Pulse Width Modulation) switching signal according to a stator quadrature-axis voltage control law so as to control a motor-side converter and realize control on a turbine. The wave energy capturing efficiency can be improved.

The invention relates to the technical field of power transmission line self-energy-taking, and discloses a power transmission line self-energy-taking device and a state detection system, and the device comprises a housing structure, a motion structure, an electromagnetic power generation structure, and a friction power generation structure. Wherein the moving structure is composed of a permanent magnet, a spring and a fixing groove, the vertical shell and the fixing groove are connected through the spring, and a spring mass vibration system is constructed; the electromagnetic power generation structure generates power through relative movement of a permanent magnet and a coil. The friction power generation structure generates power through sliding separation of sliding electrodes on the side faces of the fixing grooves and electrodes in the side shells. The invention further discloses a state detection system, vibration energy is collected through the device and stored in an energy storage battery through an energy management circuit to supply power to a sensor detection circuit, and data are sent to an upper computer through a wireless transmission module. The power transmission line state real-time detection without external energy supply can be realized, and the problem of power supply of monitoring equipment in remote areas is solved.

The invention discloses a control method, device, equipment, medium and product of a network-forming type permanent magnet wind power system, and the method comprises the steps: calculating the maximum wind energy tracking power outputted by the network-forming type permanent magnet wind power system under the optimal wind energy tracking based on the maximum wind energy tracking coefficient; calculating a direct-current voltage damping control coefficient of a side damping controller according to the inertia coefficient and the damping coefficient of the direct-current voltage; calculating an electromagnetic power reference value output by the permanent magnet synchronous generator according to the maximum wind energy tracking power and the DC voltage damping control coefficient; and subtracting the electromagnetic power reference value from the electromagnetic power actual value, and inputting the difference value into a machine side active power controller so as to adjust the electromagnetic power output by the permanent magnet synchronous generator. According to the method, on the basis of not adding hardware equipment, the transient stability of the grid-forming type permanent magnet wind power system during the short-circuit fault period of the power grid can be remarkably improved only by changing the control strategy of the machine-side converter of the grid-forming type permanent magnet wind power system.

The invention provides a generator tripping sensitivity calculation method and system for transient stability control. The method comprises the steps that power angle trajectory data of an instability scene of a power system are combined with a composite power angle algorithm to carry out unit grouping; calculating a comprehensive difference value of the accumulated unbalanced energy and the decelerable area of the equivalent unit before and after generator tripping to form an estimated value of the unbalanced energy directly taken away by the generator tripping; calculating the electromagnetic power transfer amount of a cut unit by utilizing power flow information at the cutting moment and the network topology of the power system, and calculating the variable amount of a slowable area by combining with an equivalent unit power angle curve translation change hypothesis; finally, unbalance energy directly taken away by generator tripping and slowable area variation corresponding to power transfer are added to estimate stability margin variation, and the stability margin variation is divided by the capacity of the generator tripping unit to calculate generator tripping sensitivity. Based on the method, the invention further provides a generator tripping sensitivity calculation system for transient stability control. According to the method, an application prospect is provided for optimization decision-making of an online or real-time transient stability control generator tripping scheme.

The utility model discloses an electromagnetic power generation device based on road vibration energy, which belongs to the technical field of energy recovery and reutilization, and comprises an energy input module which comprises a partition plate and a ball screw, a nut of the ball screw is fixedly connected with the partition plate, an elastic element is propped against the lower part of the partition plate along the axial direction of the ball screw, and an upper cover plate is buckled at the top of the partition plate; an energy conversion module; comprising a lower cylinder, a rotor is arranged in the center of the lower cylinder, a plurality of magnets are fixedly connected to the outer side of the rotor in the circumferential direction, and a plurality of coils are fixedly connected in the lower cylinder around the rotor; the motion transmission module comprises a middle barrel, and one end, away from the partition plate, of the elastic element is fixedly connected with the top surface of the middle barrel; a conversion transmission assembly is arranged in the middle barrel, converts irregular rotation of the ball screw into unidirectional rotation and transmits the unidirectional rotation to the rotor. Irregular vibration is converted into stable one-way rotation, the energy conversion efficiency is improved, and the reliability and durability of the device are enhanced.

A device is disclosed, which includes: a charge portion with a plurality of piezoelectric elements embedded in a tire configured for a vehicle, a capacitor mechanically coupled to the tire and electrically coupled to the plurality of piezoelectric elements; a transmitter coil, mechanically coupled to the tire and electrically coupled to the capacitor through a discharge portion; wherein in response to an external radial pressure on the tire resulting from movement of the vehicle which causes a pressure on the plurality of piezoelectric elements, the plurality of piezoelectric elements produce an electrical charge on the capacitor, and wherein the discharge portion electrically connects the electrical charge on the capacitor to the transmitter coil to send electromagnetic power to the vehicle.

The utility model provides a self-powered intelligent water meter based on electromagnetic power generation. The self-powered intelligent water meter comprises a first built-in cavity, a second built-in cavity, a water inlet and a water outlet, the first built-in cavity and the second built-in cavity are connected through a bolt, the water inlet is communicated with the first built-in cavity, and the water outlet is communicated with the second built-in cavity. According to the utility model, the electric signal generated by the coil is utilized, the self-power supply technology and the self-sensing technology are combined, and multiple functions are realized through the simple structure; a switch control mode is adopted in the power supply management system, so that voltage and current are only used when needed, and no electric energy is consumed in other time; the power management circuit realizes a fully-automatic switching function through battery voltage detection, so that the whole system comprises the wireless transmission module and can be called as a real self-powered system; the energy of the energy source is fully and efficiently utilized, so that no energy loss exists in the energy conversion and distribution process.

This invention discloses a device for detecting and clearing ice and snow debris from power lines, comprising five parts: a crawling mechanism, an obstacle-crossing and clearing mechanism, an eddy current heating device, an autonomous power-collecting device, and a drone docking and flight device. The autonomous power-collecting device includes an electromagnetic power-collecting device and a pantograph contact power-collecting device. The crawling device and the eddy current heating device are located inside an openable structure, while the outside of the openable structure is connected to the electromagnetic power-collecting device and the obstacle-crossing and clearing mechanism. Drone docking and flight devices are located on both sides of the crawling device, with the pantograph contact power-collecting device placed on top of the drone docking and flight devices. A main control unit is located between the crawling device and the electromagnetic power-collecting device. This invention solves the problem that traditional mechanical clearing methods easily damage power lines and accelerate wear. Simultaneously, this invention also addresses the safety hazards faced by existing clearing equipment and personnel, as well as the problem of short single-operation time due to battery performance limitations.

The present application belongs to the technical field of grid-forming converter control, in order to solve the problem that the existing control strategy is difficult to balance the transient stability and grid support capability, a hybrid synchronization control method and system considering transient stability and grid support are proposed, when the grid-forming converter is detected to have transient instability risk, a grid-following control branch based on a first-order phase-locked loop is introduced in parallel on the basis of the original grid-forming virtual synchronous machine control loop; in the initial stage of the fault, by adjusting the gain proportional coefficient, the equivalent active power reference value is reduced to zero, so as to block the active power injection and minimize the acceleration area; after a preset initial time period, by dynamic adjustment, the equivalent active power reference value tracks the current electromagnetic power in real time, while continuing to suppress the power angle oscillation, the grid support capability of the converter is effectively restored.

The invention discloses an electromagnetic hybrid wave energy collection device and method, and belongs to the technical field of ocean wave energy collection and extraction, and the electromagnetic hybrid wave energy collection device comprises a floating ball assembly, a transmission assembly, an electromagnetic power generation assembly and a friction power generation assembly. The floating ball assembly is matched with the water surface, and mechanical energy generated when waves drive the rotating rod and the supporting and fixing rod to rotate can be efficiently captured; then the mechanical energy is transmitted to the electromagnetic power generation assembly and the friction power generation assembly on the two sides through the transmission assembly, the electromagnetic power generation assembly and the friction power generation assembly are promoted to synchronously generate electric energy, the synergistic effect of electromagnetic power generation and friction power generation is achieved, and the wave energy collection efficiency and the adaptive capacity to different wave conditions are remarkably improved; the bimodal structure gives consideration to high-power output and high-sensitivity detection and adapts to a complex marine environment, meanwhile, the floating ball assembly and the two power generation assemblies are arranged at intervals, mutual interference between the assemblies is reduced, and the operation stability of the device is guaranteed.

The application provides a flexible direct current system frequency control method, device, equipment and readable storage medium, which is suitable for a water and electricity through a flexible direct current pure island sending system. When it is judged that the AC voltage of the flexible direct current sending end converter station of the system exceeds the preset first threshold value, the application can judge whether the AC fault of the flexible direct current transmission system is removed. If the AC fault is removed, the frequency reference value of the sending end converter station control system is increased from an initial value to a preset second threshold value. After the frequency reference value of the sending end converter station control system is maintained for a preset first time, the frequency reference value of the sending end converter station control system of the flexible direct current transmission system is reduced from the preset second threshold value to the initial value according to the preset frequency reference value adjustment condition. The method can reduce the overshoot of the generator electromagnetic power during the recovery of the sending end AC system fault of the flexible direct current transmission system, reduce the impact on the sending end converter station of the flexible direct current transmission system, and is beneficial to maintaining the transient stability of the system.

The invention belongs to the field of mechano-electronics and industrial automation control, and particularly relates to an industrial-grade electromagnetic boosting arm device with a fault self-diagnosis and passive safety mode, which comprises a loading seat integrated with a circuit board. The device comprises an electromagnetic driving execution module, a multi-mode sensing acquisition module, a self-adaptive signal conditioning module, a real-time fault diagnosis module, a passive safety decision module and a dynamic trajectory planning module. Through the dynamic filtering and phase locking technology of the adaptive signal conditioning module, the interference of the noise of the power switch on the signal of the rotary transformer is effectively suppressed, and the accuracy of fault diagnosis and the positioning precision of the device are remarkably improved. A multi-dimensional parallel diagnosis mechanism of the real-time fault diagnosis module can identify potential faults of a motor, a transmission chain and a sensor in an early stage, and device performance deterioration caused by fault accumulation is avoided.

An infrared automatic switching light filter with wireless power supply includes: a housing; a light filter carrier plate slidably provided in the housing; and a driving mechanism configured to drive the light filter carrier plate to slide. The electromagnetic power mechanism includes a bracket; a coil is wound around outside the bracket along an axial direction of the bracket; the bracket is provided with conductive elastic pieces respectively connected to both ends of the coil; end portions of the conductive elastic piece are respectively provided with protrusion in contact with and connected to an external power supply apparatus; the electromagnetic power mechanism further includes a U-shaped magnetic conductive member penetrated through the bracket; and the transmission mechanism includes a rotary magnetic member provided between two ends of the U-shaped magnetic conductive member.

The utility model provides a kind of electromagnetic power chuck structure, comprising: electromagnetic power part, permanent magnet, main shaft, power chuck, transition disc, shield and pull rod;Electromagnetic power part is fixed on the inner wall of shield, the direction and size of electromagnetic force are changed by changing the current direction and current size of electromagnetic winding;Main shaft is connected with power chuck by transition disc;Electromagnetic power part controls permanent magnet to drive pull rod to move together by changing magnetic pole direction, pull rod pushes and pulls power chuck, and the chucking or loosening of the chucking jaw of power chuck is realized;The clamping force of power chuck is controlled by changing the magnetic force size of magnet to change the size of direct current.

The invention relates to the technical field of high-voltage electric energy collection, and discloses a power generation device and a power generation system applied to a high-voltage transmission line. The power generation device comprises a frame, a magnet, an electromagnetic power generation module and a friction power generation module. When the high-voltage power transmission line is electrified, the magnet can move under the action of magnetic torque generated by the high-voltage power transmission line. The electromagnetic power generation module comprises a magnetic induction coil, and when the magnet gets close to or away from the magnetic induction coil, the magnetic induction coil generates current under the action of the magnetic field of the magnet. The friction power generation module is arranged in the third containing cavity and comprises a magnetic sheet and a sub-module, and when the magnet gets close to the magnetic sheet, the magnetic sheet moves under the action of the magnetic field of the magnet, so that the first friction part and the second friction part rub against each other, and current is generated between the first electrode and the second electrode. Movement generated by the magnet in the power generation device under the action of the magnetic field of the high-voltage power transmission line can be converted into current of the electromagnetic power generation module and the friction power generation module at the same time, and the energy output efficiency is effectively improved.

The application discloses a variable-speed unit primary frequency modulation method based on power setting value correction, which comprises the following steps: obtaining real-time operation parameters of a target variable-speed unit; a converter of the target variable-speed unit calculates an electromagnetic power variation corresponding to a primary frequency modulation action; a control amount of a mechanical hydraulic system of the target variable-speed unit is calculated and input into the mechanical hydraulic system to obtain a mechanical hydraulic control amount; and the primary frequency modulation of the variable-speed unit is completed according to the electromagnetic power variation and the mechanical hydraulic control amount. The application further provides a system for implementing the variable-speed unit primary frequency modulation method based on power setting value correction. The variable-speed unit primary frequency modulation method and system based on power setting value correction provided by the application not only realize the primary frequency modulation of the variable-speed unit, but also have the advantages of fast frequency modulation speed, high reliability, good practicability and good frequency modulation effect by virtue of the innovative control strategy design.

The application discloses a kind of vibration electromagnetic coupling-based marine power machinery vibration reduction and energy collection device, it is related to vibration control and energy recovery technical field, including shell, guide rod, mass block slidable along guide rod, composite transducing module;Composite transducing module includes electromagnetic power generation unit, piezoelectric power generation unit and energy management circuit;Electromagnetic power generation unit includes magnet group, inductive conductor;Piezoelectric power generation unit includes at least one piezoelectric element, piezoelectric element one end is connected with mass block, other end is connected with shell or structure fixed to shell, so that the relative displacement between mass block and shell can force piezoelectric element to produce deformation.Mass block cuts static magnetic field magnetic induction line and generates electromagnetic electric energy;While extruding piezoelectric element generates piezoelectric electric energy, and both are exported after circuit management.The present application efficiently converts harmful vibration energy into electric energy, while achieving vibration reduction, power supply for low-power consumption equipment, compact structure, high reliability, high energy recovery efficiency.

The energy storage container comprises a container body, a wind power shutter structure, a magnetic pole structure and energy storage equipment, the wind power shutter structure is arranged on the side wall of the container body and comprises blades, connecting rods, arc-shaped springs and copper wire winding structures, the connecting rods are inserted into the side wall of the container body, and the magnetic pole structure is arranged on the side wall of the container body. The ends, away from the container body, of the connecting rods are connected with the blades, the ends, located in the container body, of the connecting rods are connected with the arc-shaped springs and connected with the copper wire winding structures through the arc-shaped springs, the magnetic pole structures are installed in the container body, and the copper wire winding structures are used for cutting magnetic induction lines of the magnetic pole structures. And the copper wire winding structure is connected with energy storage equipment. Magnetic induction lines of the magnetic pole structures can be stably cut through the wind power shutter structures, and efficient electromagnetic power generation is achieved; meanwhile, the arc-shaped spring can play damping and resetting roles, so that the equipment stability is improved, and the problem that the container cannot effectively utilize wind energy is solved.

The invention discloses a piezoelectric nanometer-electromagnetic power generation composite omnidirectional flow energy power generation device which comprises an electromagnetic power generation mechanism, a coupler, a transmission shaft, an arc-shaped flow chamber structure and a mounting frame structure. The electromagnetic power generation mechanism is connected with the transmission shaft through a coupler; the mounting frame structure comprises a first trapezoidal arm and a second trapezoidal arm which are arranged on the transmission shaft at an interval, and the arc-shaped flow chamber structure is fixedly connected with the transmission shaft through the first trapezoidal arm and the second trapezoidal arm; a piezoelectric nano power generation structure is arranged in the cavity structure; the piezoelectric nanometer power generation structure comprises a cylinder structure and a piezoelectric power generation component, and the cylinder structure is connected with the piezoelectric power generation component in a clamped mode through an formed clamping groove structure. An arc-shaped flow chamber structure in the omni-directional flow energy power generation structure is driven by flowing fluid to drive a transmission shaft to rotate, and the transmission shaft drives an electromagnetic power generation mechanism to rotate through a coupler to generate power. According to the invention, the problems of single technical efficiency bottleneck and insufficient omnidirectional response capability of the current fluid energy collection technology are solved.

The invention discloses a marine power machinery vibration reduction and energy collection device based on vibration electromagnetic coupling, and relates to the technical field of vibration control and energy recovery, the marine power machinery vibration reduction and energy collection device comprises a shell, a guide rod, a mass block capable of sliding along the guide rod, and a composite transduction module; the composite transduction module comprises an electromagnetic power generation unit, a piezoelectric power generation unit and an energy management circuit; the electromagnetic power generation unit comprises a magnet group and an induction conductor; the piezoelectric power generation unit comprises at least one piezoelectric element, one end of the piezoelectric element is connected with the mass block, and the other end of the piezoelectric element is connected with the shell or a structure fixed to the shell, so that relative displacement between the mass block and the shell can force the piezoelectric element to deform. The mass block cuts magnetic induction lines of a static magnetic field to generate electromagnetic electric energy; and the piezoelectric element and the piezoelectric electric energy are output after being managed by a circuit. Harmful vibration energy is efficiently converted into electric energy, power is supplied to low-power-consumption equipment while vibration reduction is achieved, the structure is compact, reliability is high, and the energy recovery efficiency is high.

The application discloses a kind of variable-speed hydroelectric generating set primary frequency modulation methods based on unit rotating speed fixation, including obtaining unit real-time operating parameter and unit parameter;Converter calculates electromagnetic power variation according to target electromagnetic power;Calculate the first opening control quantity and the second opening control quantity of unit;Calculate the mechanical hydraulic system control quantity in unit;Mechanical hydraulic system control quantity is input to mechanical hydraulic control system to obtain mechanical power variation;According to electromagnetic power variation and mechanical power variation, complete target variable-speed hydroelectric generating set primary frequency modulation.The application further discloses a kind of system for implementing the variable-speed hydroelectric generating set primary frequency modulation method based on unit rotating speed fixation of the application.The application adjusts unit operating speed according to target power value, not only realizes the variable-speed hydroelectric generating set primary frequency modulation based on unit rotating speed fixation, but also has high reliability, good stability and better effect.

The invention relates to the technical field of electromagnetic energy enhancement and electromagnetic power synthesis, and the existing method is extremely sensitive to the position of a radiation point source in a material and the change of the sectional area of the material, and has high dependence on the numerical value of the relative dielectric constant E or the relative permeability mu of the material. The invention provides an electromagnetic energy enhancement structure based on a dielectric constant near-zero metamaterial, and the structure is characterized in that electromagnetic energy supply structures are located at the periphery of an electromagnetic energy collection region, and the electromagnetic energy collection region and all the electromagnetic energy supply structures are disposed in a metal boundary; energy radiated by the electromagnetic energy supply structures is transmitted to the electromagnetic energy collection area through the filling area to be received, linear superposition of electromagnetic energy in the electromagnetic energy collection area is achieved, the intensity of the output electromagnetic energy is regulated and controlled by adjusting the number of the electromagnetic energy supply structures, and nearly 100% energy transmission efficiency can be achieved.

An electromagnetic power source (100, Fig. 1), e.g. a cylindrical or co-axial cavity gyrotron, surface wave source, klystron or travelling wave tube, configured to generate microwave or terahertz power modes for heating plasma in a nuclear fusion reactor (300, Fig. 6) is described. The power source comprises an excitation cavity 108 configured to generate an electromagnetic power mode 112, wherein the excitation cavity comprises a first, inner layer 122 thermally coupled to a second, outer layer 124, wherein the first layer comprises electrically conducting metal, e.g. copper, silver or gold, and the second layer comprises diamond. The diamond of the second layer may be a metal composite diamond or may be formed by chemical vapour deposition (CVD). The second layer may, for example, comprise: a unitary structure; a plurality of coaxially stacked, hollow cylindrical or toroidal segments (130, Fig 8a); or a plurality of rectangular bars joined using a brazing or bonding material (123, Fig. 4).

The invention discloses a power converter for frequency support, and a control method and equipment of the power converter. The power converter comprises a power conversion circuit and a controller. The first end of the power conversion circuit is connected with a power grid, and the second end is connected with a power supply; the controller serves as a core control unit, calculates and determines an adaptive damping compensation coefficient according to the virtual inertia and the active frequency modulation coefficient of the power converter, and then achieves decoupling of a damping control link and an active frequency modulation link by adding a first-order lead-lag link in an electromagnetic power feedback channel of an active ring of the power converter. Meanwhile, in the first-order lead-lag link, the determined damping compensation coefficient is utilized to superpose transient compensation electromagnetic power for output of an electromagnetic power feedback channel, and complete network construction control logic is formed.

The utility model discloses a lifting device. The lifting device comprises a fixing piece, a truss, a first shaft, a second shaft, an actuating mechanism, an electromagnetic power-off brake, a lifting mechanism and a controller. One end of the first shaft is connected to the end part of the truss, and the first shaft is rotatably connected to the fixing piece; one end of the second shaft is connected to the end part of the truss, and the second shaft is rotatably connected to the fixing piece; the actuating mechanism is mounted on the fixing piece and is in transmission connection with the second shaft; the electromagnetic power-off brake is installed on the fixing piece, connected with the first shaft or the second shaft and configured to tightly hold the first shaft or the second shaft during power failure. The hoisting mechanism is connected to the truss; the actuating mechanism and the electromagnetic power-off brake are connected to a power supply through a controller; the controller is configured to control power-on and power-off of the actuating mechanism and the electromagnetic power-off brake and the rotation direction of the output end of the actuating mechanism. The lifting device can be mounted on a wall of a plant or a structural steel column, does not occupy ground space, and has higher carrying efficiency.

This invention relates to power electronics technology, specifically to a method for transient stability analysis of multi-inverter systems based on a two-layer iterative equal-area method. The method involves establishing a mathematical model of a multi-grid-connected inverter parallel system, defining the equivalent mechanical power, electromagnetic power, other-machine electromagnetic power, electromagnetic interaction power, and self-damping and mutual damping of the system. First, non-integrable terms are scaled down to make them integrable. Then, using the proposed two-layer iterative equal-area method, the upper and lower boundaries of the power angle stability of the multi-grid-connected inverter parallel system are obtained through two iterations. This method, by combining iteration and scaling, improves the conservatism of the stability region estimate as much as possible without causing stability misjudgments. Using the two-layer iterative equal-area method, a relatively accurate estimate of the stability region of the grid-connected inverter parallel system is obtained, improving the conservatism of the original equal-area method applied to VSC parallel systems. It has good development potential and room for promotion.

The invention belongs to the technical field of dynamic safety and stability analysis of a power system, and discloses a synchronous generator inertia identification method, system and device and a medium, and the method comprises the steps: analyzing electromechanical characteristics through employing a rotor motion equation of a synchronous generator, and constructing a synchronous generator inertia identification function in combination with Laplace transformation; forming a synchronous generator inertia identification algorithm based on an adaptive forgetting factor recursive auxiliary variable by combining the adaptive forgetting factor based on a recursive least square method and an auxiliary variable method; and discretizing a synchronous generator inertia identification function by using a bilinear transformation method, and extracting dynamic change data of electromagnetic power at the machine end of the synchronous generator along with mechanical power after disturbance based on a synchronous generator inertia identification algorithm of an adaptive forgetting factor recursive auxiliary variable so as to realize inertia identification. According to the method, rapid and accurate online identification of the inertia of the synchronous generator in the power system can be realized, and accurate data support is provided for comprehensive evaluation of the inertia level.

The invention relates to the technical field of diaphragm pumps, and discloses a diaphragm pump based on electromagnetic power. The diaphragm pump comprises a pump body, an electromagnet assembly and an elastic assembly. The pump body is provided with a liquid storage cavity, a liquid inlet and a liquid outlet which are communicated with the liquid storage cavity, a diaphragm for deforming the liquid storage cavity and an opening and closing assembly for closing one of the liquid inlet and the liquid outlet and opening the other one of the liquid inlet and the liquid outlet when the liquid storage cavity deforms; the electromagnet assembly is connected with the diaphragm, and drives the diaphragm to unfold the liquid storage cavity when being electrified, so that the opening and closing assembly opens the liquid inlet and closes the liquid outlet when the liquid storage cavity is unfolded; the elastic assembly abuts against the electromagnet assembly, when the electromagnet assembly is powered off, the electromagnet assembly is ejected and pressed, so that the electromagnet assembly drives the diaphragm to compress the liquid storage cavity, and the opening and closing assembly enables the liquid inlet to be closed and the liquid outlet to be opened when the liquid storage cavity is compressed. According to the embodiment of the invention, the driving precision, the driving response speed and the stability when the diaphragm pump is driven can be improved.