186 results about "Dynamo" patented technology

The invention discloses a control starting system of a hybrid mower. Relates to the field of generators and solves the problem that an existing mower is highly dependent on a storage battery. The generator is started through a pull disc, the output end of a charging coil of the generator is connected with a generator rectification module, alternating current is converted into direct current, then the direct current is transmitted to a power supply DC-DC conversion module, and the direct current is supplied to a single-chip microcomputer and a driving execution unit through voltage stabilization processing and charges a storage battery. The auxiliary power supply module receives the rectified direct current and converts the rectified direct current into multi-level stable low-voltage power to meet various peripheral requirements; the generator rotating speed acquisition module acquires and converts rotating speed signals and provides data support for single-chip microcomputer control. When the storage battery is normal, the system can be started to operate, the power supply DC-DC conversion module replaces a traditional rectifier to charge the storage battery, and continuous operation is guaranteed; and when the storage battery is lack of electricity or damaged, after the pull disc starts the generator, the rectification module, the DC-DC conversion module and the auxiliary power supply module work cooperatively, so that operation interruption is avoided, and the emergency operation capability is improved.

This utility model relates to the field of generator set maintenance technology, and in particular to a generator set fault location circuit. A voltage acquisition element measures and collects voltage waveform signals from the generator terminals and the low-voltage side of the main transformer; a current acquisition element measures and collects the zero-sequence currents from the generator terminals, the high-voltage side of the excitation transformer, the low-voltage side of the main transformer, and the high-voltage side of the high-voltage transformer; the fault location element transmits data through a signal transmission interface connected to the terminals of the current acquisition element. This system can accurately determine the location of a single-phase ground fault, narrowing the fault location range and improving maintenance efficiency. The optical current transformer is unaffected by conductor spatial arrangement and magnetic field imbalance, accurately measuring zero-sequence current with a wide measurement range and no saturation problem. The insulating frame of the primary sensing unit can be designed according to the size and arrangement of the three-phase conductors being measured in the protected generator set, without strict requirements on conductor shape, size, and arrangement, facilitating installation and maintenance.

The invention relates to the field of electrical engineering. A multi-pole, multi-phase generator-motor comprises a fixed magnetic core (stator), a movable magnetic core (rotor), a magnet and a winding. The fixed magnetic core contains a base element which consists of a magnet with a magnetizing winding and with generating windings arranged on two sides of the magnet such as to provide for opposite magnetic flux reversals in the combined power winding when the movable magnetic core is moving. The magnetizing winding is fed by the power windings via a rectifier. The number of base elements is a multiple of 6 or 12. The base elements are offset from one another by an angle β = Т+ΔТ and are arranged uniformly at the vertices of regular polygons, where T is a period determined by the angular size of a tooth and a space of the rotor, and ΔТ is the same dimension divided by the number of phases required by the consumer. All of the power windings of the base elements are connected in series. The technical result is that of providing a multi-phase alternating voltage to the end consumer.

The invention relates to an aerosol delivery device. An aerosol delivery device may include an atomizer, a reservoir configured to contain an aerosol precursor composition, and a circuit coupled to the atomizer. The circuit may include a generator assembly including a movable input member and a generator configured to generate an electrical current from movement of the movable input member. The circuitry may be configured to direct an electrical current to the atomizer to generate an aerosol from the aerosol precursor composition. The invention also provides a related aerosol production method.

The invention provides a method for improving PT residual voltage frequency measurement accuracy based on rotation vector characteristics, and relates to the technical field of generator set rotation speed measurement. The method comprises the following steps: acquiring a three-phase voltage alternating current signal through a generator end PT; processing the three-phase voltage signal to obtain projections of a voltage rotation vector on alpha and beta static coordinate axes; frequency characteristics are extracted based on projection and voltage amplitude and can be realized through direct calculation or a phase locking link; performing low-pass filtering on the frequency characteristic direct current quantity; a generator speed is calculated based on the filtered frequency and provided to a governor. According to the method, the limitation that a traditional PT residual voltage method only depends on zero crossing point information is broken through, frequency characteristics are extracted through a complete voltage sequence, alternating current signal filtering distortion is avoided through direct current filtering, high measurement precision and high anti-interference capacity can still be kept under the low-speed working condition, the problems that an existing speed measurement method is insufficient in precision and weak in anti-interference capacity are effectively solved, and the method is suitable for popularization and application. And reliable guarantee is provided for safe and stable operation of a unit.

The invention belongs to the field of fault protection of a high-voltage direct-current generator controller, and particularly relates to a software design method for excitation positive short circuit of a generator controller, which comprises the following steps of: setting excitation protection conditions, and when the frequency of a permanent magnet machine is greater than or equal to a network casting rotating speed, a voting unloading signal is network casting permission and a control command of a main contactor is switched on; when the excitation protection condition is met, an excitation over-ground short circuit fault protection mark is set, excitation is removed, and the main contactor is switched off; when it is detected that the excitation positive voltage is normal for a first continuous number of times, eliminating the excitation positive voltage abnormal count and the excitation over-ground short circuit fault mark; and if the frequency of one beat of the permanent magnet machine is smaller than the network casting rotating speed or the voting unloading signal is unloading or the main contactor control command is disconnection, clearing the excitation positive voltage abnormal count, the excitation positive voltage jump count and the excitation over-ground short circuit fault mark. And the continuous short circuit or intermittent short circuit fault of the excitation positive voltage can be accurately identified.

The invention relates to the technical field of power supply, and discloses an alternating current doubling device and engineering machinery, and the alternating current doubling device comprises a generator interface; an AC pile interface; a charging output interface; the first power supply line is connected with the generator interface and the charging output interface; the second power supply line is connected with the alternating current pile interface and the charging output interface; the interlocking structure is respectively connected with the first power supply circuit and the second power supply circuit; and the interlocking structure is used for controlling one of the first power supply circuit and the second power supply circuit to be switched on and controlling the other power supply circuit to be switched off. By constructing the first power supply line and the second power supply line, the scene limitation of a single energy compensation mode is broken, and the problem of energy compensation when no charging facility exists in a remote area is solved. Meanwhile, the interlocking structure forcibly controls the two power supply lines, one power supply line is switched on, the other power supply line is switched off, and the electric shock risk caused when one power supply line is powered on and the other power supply line is electrified is eliminated.

A method for setting out reserved holes in curtain grouting stop walls based on Dynamo, relating to the field of building construction technology. The method includes: extracting the coordinates and corresponding diameters of the borehole opening and bottom from borehole design data; connecting the coordinates to generate the borehole axis, and transforming the initial contour constructed based on the diameter to the normal coordinate system at both ends of the axis; fusing the contours at both ends along the axis to generate a three-dimensional variable-diameter grouting hole model; extending the stop wall contour according to a preset thickness to generate a three-dimensional stop wall model; performing Boolean difference operations on the two models to remove overlapping parts, obtaining a layout model of irregular holes; extracting the inner and outer double boundary lines generated by the oblique intersection of the hole and the thick wall surface as spatial intersection lines; reducing the dimension of the intersection line to a two-dimensional plane to generate spline curves, and outputting the hole location layout diagram. Implementing the technical solution provided in this application improves the accuracy of grouting hole location layout while ensuring construction efficiency.

The invention discloses a multifunctional tester for electric power new energy electrical equipment, and relates to the technical field of new energy electrical multifunctional tests. The multifunctional tester for the electric power new energy electrical equipment comprises a tester main body, a protective shell and a protective cover, the upper surface of the tester main body is fixedly connected with a direct-current voltage measurement digital display meter, a direct-current measurement digital display meter, an alternating-current voltage measurement digital display meter, an alternating-current measurement digital display meter, a power supply display lamp, a working position display lamp, a zero position display lamp and an alternating-current and direct-current conversion switch, and the interior of the tester main body is fixedly connected with an isolation voltage regulator. The top of the isolation voltage regulator is provided with an adjusting knob, the upper surface of the tester main body is provided with a power jack and a wiring hole, and the inner surface of the protection housing is fixedly connected with a first elastic plate and a second elastic plate, thereby solving the blank field of no test instrument for the AC impedance of the wind driven generator rotor, and enabling the test work difficulty of a new energy station to be simplified.

The invention provides a Kelvin drip generator corona discharge enhancement-based friction nanometer generator and a preparation method thereof. Wherein the generator comprises a Kelvin water dripping machine, high voltages at two ends of the Kelvin water dripping machine are respectively coupled to a back gate electrode and a suspension needle, a non-uniform electric field is constructed in a needle tip-FEP area, corona discharge is triggered, charges are directionally injected into an FEP / liquid drop system, and the FEP / liquid drop system is charged. The injected charges are connected in parallel into the device through a multi-branch capacitor network formed by the back gate electrode, the upper electrode / the lower electrode and the FEP. According to the invention, through cooperation of exogenous pumping and liquid drop charge shuttling (DSG), single-drop transfer charge and open-circuit voltage are significantly improved, and direct-current stepped accumulative output is maintained.

The utility model discloses a wire bar and generator stator with temperature measurement function, aims at solving the temperature sensor in traditional wire bar structure, cannot directly measure the temperature of wire bar conductor, there is temperature measurement result misalignment, temperature measurement efficiency is low and cannot realize the overheating early warning of generator stator's problem. The wire bar body and temperature sensor of the utility model, the wire bar body includes conductor and insulating layer, and the insulating layer is sleeved on the conductor, and the temperature sensor includes temperature sensing probe and signal transmission part, and temperature sensing probe is connected with signal transmission part, temperature sensing probe is connected with the conductor, and the insulating layer is connected with temperature sensing probe, and signal transmission part sets up between the insulating layer and the conductor and leads out from one end of the insulating layer. Through temperature sensing probe and conductor direct connection, make temperature sensor can directly monitor the temperature condition of conductor, avoid the thermal resistance delay of indirect temperature measurement, ensure the accuracy and timeliness of temperature monitoring, improve the efficiency of temperature monitoring.

The application provides a fault identification method and device of an excitation system based on phase voltage and phase current, and relates to the field of power systems. According to a cycle integral algorithm, three-phase phase current instantaneous values of a three-phase alternating current side current transformer of a small current test platform of a generator excitation system, three-phase phase voltage instantaneous values of a low voltage side of a synchronous transformer and rectifier output voltage instantaneous values are calculated to obtain three-phase phase current effective values, three-phase phase voltage effective values and rectifier output voltage effective values. An average value of the three-phase phase voltage effective values and the rectifier output voltage effective values are used to obtain a measured thyristor trigger angle during an open-loop load test. If a difference between the measured thyristor trigger angle and a given thyristor trigger angle is greater than a first preset threshold value, a fault phase is determined according to a first constraint relationship corresponding to the three-phase phase current effective values and a second constraint relationship corresponding to the three-phase phase voltage effective values after the thyristor is closed. The application has stronger anti-interference capability and strong engineering applicability.

An induction generator (2) is configured for driving an induction circuit (4), in particular for driving an induction coil of an induction hob (30). The induction generator (2) comprises: a power supply unit (8) configured to provide an input voltage (Vi) with respect to a common voltage (Vc); a driving unit (10) configured to provide a first and a second transistor driving voltage (Vg1, Vg2); a half-bridge arrangement (12) comprising a first transistor and a second transistor (14, 16) connected to each other at a middle node (22), wherein the first and second transistors (14, 16) are connected between the input voltage (Vi) and the common voltage (Vc), wherein the first transistor driving voltage (Vg1) is applied to the gate of the first transistor (14), and wherein the second transistor driving voltage (Vg2) is applied to the gate of the second transistor (16); a resonance circuit (4) comprising an induction coil element (6) being electrically connected at one end to the middle node (22) and being configured to emit an electromagnetic field when in operation; a control unit (20) having an output configured to supply a control signal to the driving unit (10) and having an input electrically connected to the middle node (22) configured for sensing the middle voltage (Vm) at the middle node. The control unit (20) is configured to apply the control signal at a setpoint frequency to the driving unit (10) such that via the first and second transistor driving voltages (Vg1, Vg2) a temporal switching sequence is implemented where the first transistor (14) is switched on and off and the second transistor (16) is switched on and off with a delay period (To) between switching off the first transistor (14) and switching on the second transistor (16). The control unit is further configured to detect the middle voltage (Vm) and / or the complimentary middle voltage (Vm*); and to evaluate the amplitude of the middle voltage (Vm) or the temporal behavior of the middle voltage (Vm) in relation to the switching off of the first transistor (14) and / or in relation to the switching on of the second transistor (16), and / or to evaluate the amplitude of the complimentary middle voltage (Vm*) or the temporal behavior of the complimentary middle voltage (Vm*) in relation to the switching off of the second transistor (16) and / or in relation to the switching on of the first transistor (14). The control unit is further configured to increase or to decrease or to maintain the setpoint frequency of the switching sequence being applied via the control signal in dependency of the evaluation. Alternatively or additionally the control unit is further configured to increase or to decrease or to maintain an on-time ratio (Ta / Tb or Tb / Ta), where within a switching sequence Ta is the duration of switching on the first transistor (14) and Tb is the duration of switching on the second transistor (16).

This invention relates to a dual-loop converter for a linear-rotating switched reluctance generator and its control method. The drain of the positive switching transistor of each phase of the rotating generator unit is connected to a first positive circuit, and the source of the negative switching transistor of each phase of the rotating generator unit is connected to a first negative circuit. One end of a load resistor is connected to a first load circuit and a second load circuit connected in parallel, and the other end of the load resistor is connected to a third load circuit and a fourth load circuit connected in parallel. The cathode of the diode of each phase of the rotating generator unit is connected to the first load circuit, and the positive terminal of the winding of each phase of the rotating generator unit is directly connected to the third load circuit. The cathode of the diode of each phase of the DC generator unit is connected to the second load circuit, and the positive terminal of each phase of the DC generator unit is directly connected to the fourth load circuit. This invention solves the technical problems of existing converters using a large number of components and having high line current pressure.

The utility model relates to the field of insulation protection, and particularly discloses a sealing structure of a winding motor rotor winding outgoing line, which comprises an elastic sheath tube, the sheath tube comprises a vertical unit and a horizontal unit, and the horizontal unit is integrally formed at the upper part of the vertical unit; the vertical unit comprises an insulating tube coating part, a fastening bolt coating part and a conductive screw coating part, the fastening bolt coating part is integrally formed on the insulating tube coating part, the fastening bolt coating part is step-shaped, the conductive screw coating part is integrally formed on the fastening bolt coating part, and the conductive screw coating part is step-shaped; the horizontal unit is located on the side face of the fastening bolt wrapping part. The utility model aims to solve the technical problem of how to seal and insulate.

The invention belongs to the technical field of aviation power generation systems, and discloses an alternating current starting power generation system starting phase sequence online identification method, which comprises the following steps of: 1, providing 28V control electricity and 115V / 400Hz three-phase constant-frequency alternating current for a generator controller; 2, setting a current comparison threshold value, wherein a data acquisition period is as follows; the starting generator controller is used for converting the 115V / 400Hz three-phase constant-frequency alternating current into low-voltage three-phase constant-frequency alternating current; 3, applying the low-voltage three-phase constant-frequency alternating current to a three-phase winding of a main generator stator to generate three-phase current; step 4, collecting three-phase current fed back by a current sensor, and recording the three-phase current as,..., and collecting three-phase current fed back by a motor mutual inductor, and recording the three-phase current as,...; 5, calculating the sum of the three-phase current according to the sum; and 6, calculating the absolute value of the current sum in one current period, solving the average value of the absolute values of continuous N periods, if the average value is smaller than a set threshold value, indicating that the starting phase sequence is correct, otherwise, indicating that the starting phase sequence is wrong.

The invention discloses an electric power system static voltage stability prevention and control method and device, terminal equipment and a storage medium, and belongs to the technical field of electric power system stability control, and the method comprises the steps: obtaining the current generator active output, terminal voltage, reactive compensation, line load, node voltage and node power of an electric power system; inputting the active output, the terminal voltage, the reactive compensation and the line load of the generator into a preset load margin prediction model constructed based on a convex neural network to obtain a first load margin prediction value; inputting the first load margin predicted value, the node voltage and the node power into a preset voltage stability control model to obtain a current control decision parameter of the power system; and finally performing voltage stability control on the power system according to the control decision parameter. By implementing the method, the problems of complex calculation and low solving efficiency of a method for formulating a control strategy by iteratively solving non-convex nonlinear constraints in the prior art can be solved.

A power generating system comprising an electrical generating set and a modulator configured to maintain optimal voltage regulation under varying load conditions. The system includes a controllable current power source; an active rectifier coupled to the controllable current power source, configured to rectify an output of the controllable current power source to supply utility-grade power or for recharge of a battery or batteries. A controller is configured to adjust at least one of the parameters of the controllable current power source and / or supply from the generator and a parameter of the active rectifier in response to a target output.

The application discloses a converter, a control method and related products. The converter comprises a three-phase full-bridge circuit, a controllable voltage source and a controller; the direct current first end of the three-phase full-bridge circuit is used for connecting a direct current positive electrode, the direct current second end of the three-phase full-bridge circuit is used for connecting a direct current negative electrode, and the three-phase alternating current end of the three-phase full-bridge circuit is used for connecting a converter transformer; the output end of the controllable voltage source is connected with the three-phase alternating current end of the three-phase full-bridge circuit in one-to-one correspondence; and the controller is configured to control the three-phase full-bridge circuit and the controllable voltage source according to the motion equation of a virtual rotor with virtual rotational inertia and a damping coefficient. In the application, the inertia characteristic and the damping characteristic of a synchronous generator are simulated by introducing the motion equation with the virtual rotational inertia and the damping coefficient, so that the three-phase full-bridge circuit and the controllable voltage source provide inertia support when the frequency of alternating voltage changes, the frequency change rate of the alternating voltage is delayed, and the system anti-interference capability is improved.

The embodiment of the invention provides an energy storage battery grid-connected peak load shifting control method, device and system, and belongs to the technical field of power system energy storage. The method comprises the following steps: acquiring a real-time sampling value of an output current of a direct-current converter at an energy storage battery side; performing moving average processing on the real-time sampling value of the output current of the direct-current converter to obtain an output value after moving average processing; obtaining a first current value according to the output value after moving average processing and an output current reference value of a rectifier at a generator side, and obtaining a dynamic output voltage reference value of the energy storage battery through dynamic droop control according to the first current value and a real-time sampling value of the output current of the direct current converter; and taking the dynamic output voltage reference value as the input of a voltage loop, and controlling the duty ratio of a power device in the direct current converter through the adjustment of the voltage loop and a current loop.

This invention relates to the field of fault detection technology, specifically to a method and system for detecting inter-turn short circuits in generator stator windings. The method involves simultaneously acquiring stator branch current, air gap magnetic field, and frame vibration signals; preprocessing and standardizing the signals according to operating conditions; extracting and adaptively fusing three types of feature vectors—branch current circulation, magnetic field asymmetry, and vibration characteristic spectrum correlation—to generate a comprehensive fault feature vector; inputting this vector into a trained intelligent inter-turn short circuit classifier, which outputs fault discrimination results and a continuous short-circuit fault confidence index; and finally, combining the confidence index trend with the feature contribution backtracking analysis results to generate a comprehensive condition assessment report. This invention achieves highly sensitive and reliable online detection and early warning of early, weak inter-turn short circuits.

The utility model provides a control circuit based on an excitation generator, which acquires the frequency of the output voltage of a target excitation generator through a frequency acquisition module, can accurately represent the rotating speed of the target excitation generator through the frequency of the output voltage, and converts the frequency into a direct-current rotating speed voltage signal through a frequency-to-voltage conversion module; the rotating speed voltage signal is compared with different reference signals through three comparison units of the rotating speed segmentation module, so that a current rotating speed interval can be distinguished; the combined output of the three comparison units is identified and converted through a decoder of the winding selection control module, and three control signals respectively corresponding to the current rotating speed interval can be provided at three output ends of the decoder. The control circuit based on the excitation generator can effectively realize respective starting control of the three groups of excitation windings of the target excitation generator, does not need a high-cost analog-to-digital converter and a high-cost digital signal processor, and can effectively reduce the control cost of the excitation generator.

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.

A medium voltage inrush current (MVIC) regulator and interconnection control system for interposing between a distributed power generation facility and a utility grid. The facility has a designated generator step-up (GSU) transformer and is connected to the utility grid at a point of interconnect. The system includes a pre-insertion impedance injection transformer, a low voltage first switch connected between the pre-insertion transformer and secondary coils of the designated GSU transformer, a medium voltage second switch connected inline between the pre-insertion transformer and primary coils of the designated GSU transformer, and a controller. In response to restoration of the utility grid following a loss-of-grid event, the controller opens and closes the first and second switches according to an automated pre-energization switching sequence such that magnetic flux in the designated GSU transformer occurs at a reduced rate, thereby reducing inrush of current and undesirable power quality phenomena.

This invention discloses a high-voltage DC power supply system and control method for LED fish-attracting lights on fishing boats. The system employs a PLL (phase-locked loop) to achieve precise phase tracking of the power grid within a wide frequency range of 40Hz to 55Hz. Through dual closed-loop control of the voltage outer loop and current inner loop combined with SVPWM modulation, it stably outputs a 700V to 800V high-voltage DC bus under a wide voltage fluctuation range of 380V to 450V from the ship's generator. The q-axis current command is set to zero to achieve unity power factor operation, effectively reducing harmonics and avoiding interference with the ship's radar, navigation, and communication equipment. The subsequent DC / DC unit uses isolated or non-isolated step-down circuits to convert the high-voltage bus voltage to the operating voltage required by the LED fish-attracting lights. This invention features high voltage utilization, high system efficiency, and adaptability to the harsh electrical environment of fishing boats, significantly reducing line losses and fuel consumption.

The utility model relates to the technical field of generator inverters, in particular to a double-voltage inverter, which comprises a power plug, a permanent magnet motor, a rectifier bridge, a protection circuit, a filter voltage stabilizing circuit and a power amplification circuit. The rectifier bridge comprises an inductor L1, an inductor L2, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, the inductor L1 is connected with a live wire of the power plug, the inductor L2 is connected with a neutral wire of the power plug, one end of the transistor Q1 and one end of the transistor Q2 are respectively connected with the inductor L1, one end of the transistor Q3 and one end of the transistor Q4 are respectively connected with the inductor L2, and the inductor L2 is connected with the neutral wire of the power plug. And the other end of the transistor Q1 is connected with the other end of the transistor Q3, and the other end of the transistor Q2 is connected with the other end of the transistor Q4, so that the problems of complex structure and electronic circuit, high cost, large size and heavy weight of the existing double-voltage inverter motor of the generator are solved.

A test field (2) for electrically testing devices (4) using high electrical power under direct current (DC) comprises at least one power source (12) with a generator (14) for alternating current (AC) and a converter (16) with first two-pole DC interfaces (18), and test stations (20) for the devices (4) with a resonant converter (22) with a second two-pole DC interface (26) and a buck converter (24) with a two-pole DC connection (28) for the device (4), and a modular DC bus (30) with a series connection of DC distribution boards (34) with series-connectable busbars (32) and branches (36) leading from the busbar (32) to a third two-pole DC interface (38), with disconnectors (40), wherein each of the first (18) and second DC interfaces (26) is connected to a is connected to the third DC interface (38).

The application provides a generator outlet voltage transformer real-time state monitoring method and system, relates to the generator monitoring technical field, and the method comprises the following steps: configuring a composite excitation signal, applying the composite excitation signal to the secondary side of the voltage transformer through a power amplifier and a safety coupling unit, collecting a current response signal and a voltage signal, demodulating, calculating the frequency domain impedance spectrum of the voltage transformer under different instantaneous bias voltages, analyzing the instantaneous change relationship of the frequency domain impedance spectrum with the low-frequency bias voltage signal, calculating the dynamic differential impedance spectrum, and evaluating the insulation state of the voltage transformer according to the dynamic differential impedance spectrum. The technical problem that the accuracy and reliability of the monitoring result of the voltage transformer of the generator outlet are not high in the prior art is solved. The technical effects that the insulation state of the voltage transformer of the generator outlet is monitored in real time and accurately, and the safety and reliability of the operation of the voltage transformer are improved are achieved.

The utility model discloses an AC generator rotor bearing protection structure, which is applied to the field of generators and comprises a motor shell, an end cover is mounted on the surface of the motor shell, and a rotor shaft is arranged on the inner wall of the end cover; heat of the bearing is conducted to the heat dissipation fins through the first heat conduction plate, the heat dissipation fins rotate to rapidly dissipate the heat, the purpose of heat dissipation can be achieved, the stability of the bearing is guaranteed, the service life is prolonged, meanwhile, the first heat conduction plate can protect the outer side of the bearing, the protection effect is improved, and the service life of the bearing is prolonged. Heat generated during rotation of the bearing is conducted into the annular oil storage cavity through the first heat conduction ring and the second heat conduction ring, so that the temperature of the annular oil storage cavity is increased, lubricating oil and air in the annular oil storage cavity are heated to expand, and the lubricating oil enters a bearing raceway from capillary micropores for lubrication, and the purpose of having the lubricating function can be achieved; the stability of the bearing is ensured, and the service life is prolonged.

The invention provides a flywheel-photovoltaic hybrid energy storage system-based network construction type converter control method, and relates to the technical field of network construction type converter control, and the method comprises the steps: firstly carrying out the mathematical modeling of a photovoltaic-flywheel hybrid energy storage system, and then carrying out the deep analysis of the electromechanical characteristics and mathematical representation of a synchronous generator on the basis of the deep analysis of the electromechanical characteristics and mathematical representation of a synchronous generator; a control framework of the virtual synchronous generator is constructed, so that the network-forming converter actively establishes and stabilizes the voltage amplitude and the frequency reference of the alternating current system; and inputting a voltage reference value output by the virtual synchronous generator into an SVPWM modulation module, performing optimization control on the output of the neutral-point clamped three-level inverter by using the SVPWM modulation module, and performing three-phase grid connection on the flywheel-photovoltaic hybrid energy storage system. According to the method, the frequency stability of the power grid can be well improved, the voltage regulation capability is improved, the characteristics of low inertia and weak damping of the micro-grid are improved, and the electric energy quality and reliability of the system are improved.