15 results about "Variable-frequency transformer" patented technology

The utility model relates to the technical field of transformers, in particular to a variable-frequency transformer structure which comprises a transformer body, one side of the transformer body is of an opening structure, a plurality of sets of transverse plates are fixedly connected to the opening, gaps are formed between the transverse plates, adjusting plates are symmetrically arranged in the gaps, and the adjusting plates are fixedly connected with the transformer body. An adjusting assembly is arranged outside the transformer main body, the adjusting assembly is used for driving the opposite adjusting plates to synchronously move towards or away from each other, when the heat dissipation speed of the transformer main body needs to be accelerated, only the adjusting assembly needs to be started to work, the adjusting assembly can enable the opposite adjusting plates to slide away from each other, and therefore the heat dissipation speed of the transformer main body can be increased. Therefore, gaps between the transverse plates can be opened, and heat dissipation in the transformer body is accelerated.

This application relates to the field of power grid control and discloses a variable frequency transformer fault ride-through control method and related device for comprehensively regulating power grid voltage. The method is applied to a fault ride-through circuit, collects stator winding parameters, three-phase converter parameters, capacitor voltage, and rotor phase angle; calculates stator winding reactive power, three-phase converter positive-sequence current, and stator winding DC component based on the collected parameters; analyzes the data based on the voltage control equation to obtain the DC component of the three-phase converter's positive and negative sequence voltage reference values ​​and odd harmonic voltage reference values; analyzes the DC component of the three-phase converter's positive and negative sequence voltage reference values ​​and the three-phase converter's odd harmonic voltage reference values ​​based on the grid voltage phase angle and rotor phase angle to obtain the three-phase converter voltage vector reference value; and performs space vector modulation on the voltage vector reference value. This method addresses the current technical problem of requiring at least two three-phase converters to achieve voltage imbalance and harmonic distortion fault ride-through control, which results in high material consumption and complex operation.

This utility model discloses a structure for the output pins of a frequency converter transformer, specifically a frequency converter transformer pin structure. It includes a frequency converter transformer with output pins. A copper sleeve is fitted over the output pins, and an inlet groove is formed on the side wall of the copper sleeve to facilitate the assembly of the output pins within the sleeve. The inner surface of the inlet groove is rounded to prevent cuts to the output pins. It also includes a limiting component to prevent the inlet groove from gradually increasing in size, and this limiting component is located on the copper sleeve. The limiting component includes a ring, through which the copper sleeve passes. An annular rubber pad is fixedly installed on the inner surface of the ring, and the inner surface of the annular rubber pad is in close contact with the outer surface of the copper sleeve. This utility model improves the strength of the frequency converter transformer pins and enhances their resistance to deformation.

The utility model discloses a spilled grease collecting and reducing device which comprises a platform, a plurality of moving wheels are arranged at the bottom of the platform, a hopper is arranged on the front portion of the platform, a cleaning device is rotatably arranged on the front portion of the hopper, and adjusting devices used for adjusting the position of the cleaning device are arranged on the left side and the right side of the hopper. A material collecting device is rotationally arranged on the rear side of the interior of the hopper, a conveying auger communicated with the hopper is arranged above the platform, an electromagnetic heater communicated with the conveying auger is arranged on the rear portion of the conveying auger, and a material collecting box communicated with the electromagnetic heater is arranged on the rear portion of the electromagnetic heater. A condenser, an oil storage tank, a variable-frequency transformer and a power source are further arranged above the platform, the upper portion of the electromagnetic heater is communicated with the air inlet end of the condenser through an oil gas pipe, the oil outlet end of the condenser is communicated with the oil storage tank through an oil inlet pipe, the power source is electrically connected with the variable-frequency transformer, and the variable-frequency transformer is communicated with the electromagnetic heater and the condenser.

The invention discloses a variable frequency transformer fault ride-through control method for adjusting voltage balance and a related device, and the method is applied to a fault ride-through circuit, and collects a power grid voltage, a stator winding parameter, a three-phase converter parameter, a capacitor voltage and a rotor phase angle; calculating a stator winding parameter and a three-phase converter positive sequence current direct-current component based on the acquired parameters; performing direct-current component calculation according to the parameters by adopting a preset voltage control equation to obtain positive-sequence and negative-sequence voltage reference value direct-current components of the three-phase converter; performing coordinate transformation on the obtained direct-current component according to a power grid voltage phase angle and a rotor phase angle to obtain a three-phase converter voltage vector reference value under a two-phase static coordinate system; and performing space vector modulation on the reference value to generate a control signal, and realizing variable frequency transformer fault ride-through control based on the control signal. The technical problems that in the prior art, at least two three-phase converters are needed to achieve power grid voltage unbalance adjustment and control, material consumption is large, and operation is complex are solved.

The utility model discloses a cremation machine flue gas purification device and a cremation machine, and the purification device comprises a shell, a spiral heating pipe, an electromagnetic induction coil, a variable frequency transformer, a control unit and a heating pipe monitoring unit, detachable connecting assemblies are respectively arranged at the flue gas inlet and the flue gas outlet, and the heating time of flue gas in the spiral heating pipe is at least 2 seconds due to the pipe diameter size and the number of coiling circles of the spiral heating pipe; wherein the heating pipe monitoring unit detects real-time parameters in the spiral heating pipe and transmits corresponding detection signals to the control unit, and the control unit controls the electromagnetic induction coil through the detection signals; when the device is used, the electromagnetic induction coil can enable the spiral heating pipe to quickly form high temperature, the high temperature is instantly reached and kept above 850 DEG C, high-temperature cracking purification can be continuously carried out on smoke for a long time, the state of the spiral heating pipe is monitored in the whole process under the action of the heating pipe monitoring unit, and harmful substances in the smoke are effectively eliminated.

The application discloses a variable-frequency transformer fault ride-through control method for adjusting harmonic distortion and related devices, which are applied to a fault ride-through circuit, collects power grid voltage, stator winding parameters, three-phase converter parameters, capacitor voltage and rotor phase angle; based on the collected parameters, the stator winding reactive power and the odd harmonic DC component are calculated; based on the preset voltage control equation, the above parameters are calculated and analyzed to obtain the positive sequence voltage reference value DC component and the odd harmonic voltage reference value DC component of the three-phase converter; according to the power grid voltage phase angle and the rotor phase angle, the two parameters are analyzed to obtain the three-phase converter voltage vector reference value in the two-phase stationary coordinate system; the three-phase converter voltage vector reference value is subjected to space vector modulation to generate the control signal of the three-phase converter switch, and the fault ride-through control is realized. The prior art needs at least two three-phase converters to realize the power grid harmonic distortion fault ride-through regulation control, and the technical problems of large material consumption and complex operation exist.

The invention provides a magnetic coupling multi-port hybrid flexible interconnection device. Comprising a variable frequency transformer, a first converter, a second converter, a first transformer, a second transformer, a third transformer, a fourth transformer, a first bypass switch, a second bypass switch, a third bypass switch, a fourth bypass switch, a fifth bypass switch, a sixth bypass switch, a charging circuit and a control protection system. The magnetic coupling multi-port hybrid flexible interconnection device is provided with four external ports, namely a first alternating current port, a second alternating current port, a third alternating current port and a first direct current port. The magnetic coupling multi-port hybrid flexible interconnection device has good economical efficiency, meanwhile, the second converter can quickly output the control voltage to the position between the first alternating current power source and the second alternating current power source, and the dynamic performance of the magnetic coupling multi-port hybrid flexible interconnection device is improved.

The application provides a grid networking support system of an LCC-HVDC driven variable-frequency transformer and a topological function design method thereof, first proposes a reconstruction scheme and a constituting scheme of a converter station of a conventional DC LCC-HVDC system driven variable-frequency transformer, and proposes an underground shallow-buried variable-frequency transformer system and a constituting design thought, further establishes a grid networking support function design method based on variable-frequency transformer rotor kinetic energy, a weak AC system fault defense and protection system design method, and an LCC-HVDC driven variable-frequency transformer capacity estimation and support local wind and light field station MPPT maximum power generation estimation method.

The application provides a high-frequency transformer, and belongs to the electromagnetic technical field. The transformer comprises: a magnetic core in a ring structure and provided in parallel in two pairs; a primary winding wound on the magnetic core; and a secondary winding comprising a row of arrayed U-shaped copper blocks, two arms of the U-shaped copper blocks being respectively arranged in the ring-shaped hollow of the two pairs of magnetic cores, and the arms of all the U-shaped copper blocks arranged on the same side of the magnetic core being connected with the same first conductive plate. The scheme provided by the application can reduce the leakage inductance, reduce the loss, and improve the power density.

The invention provides frequency conversion and voltage transformation equipment which comprises a base, a transformer body arranged on the base, a sliding groove formed in the base in the circumferential direction of the base, a sliding block arranged in the sliding groove in a sliding mode, a mounting rod arranged on the sliding block, a mounting frame arranged on the top of the mounting rod and a cooling fan arranged on the mounting frame. The mounting rod is rotationally sleeved with a first gear, a rack meshed with the first gear is arranged at the top of the base, and a driving assembly is arranged on the mounting rod; a second gear rotatably sleeves the mounting rod, a mounting block is arranged on the base, an arc-shaped groove is formed in the side, close to the interior of the base, of the mounting block, a tooth groove is formed in the inner wall of the groove, a mounting shaft is arranged at the bottom of the mounting frame, the bottom of the mounting shaft is in transmission connection with the mounting rod, and a transmission assembly is arranged on the mounting rod. According to the variable-frequency and variable-voltage transformer, the heat dissipation performance of the variable-frequency and variable-voltage equipment can be improved, and the use safety and reliability of the transformer are improved.

The invention relates to the field of power grid control, and discloses a variable frequency transformer fault ride-through control method for comprehensively adjusting power grid voltage and a related device, the method is applied to a fault ride-through circuit, and stator winding parameters, three-phase converter parameters, capacitor voltage and a rotor phase angle are collected; calculating the reactive power of the stator winding, the positive sequence current of the three-phase converter and the direct current component of the stator winding according to the acquired parameters; analyzing the data based on a voltage control equation to obtain direct current components of positive and negative sequence voltage reference values and odd harmonic voltage reference values of the three-phase converter; according to the power grid voltage phase angle and the rotor phase angle, carrying out direct current component analysis on the three-phase converter positive and negative sequence voltage reference value and the three-phase converter odd harmonic voltage reference value to obtain a three-phase converter voltage vector reference value; and performing space vector modulation on the voltage vector reference value. The technical problems that at least two three-phase converters are needed to realize voltage imbalance and harmonic distortion fault ride-through regulation and control at present, consumables are large, and operation is complex are solved.

The invention discloses a hybrid flexible interconnection device for series compensation. The hybrid flexible interconnection device comprises a series converter, a variable frequency transformer, a first reactive harmonic compensation device, a second reactive harmonic compensation device, a switch S1a, a switch S1b, a switch S1c, a switch S2a, a switch S2b, a switch S2c, a switch Spa, a switch Spb, a switch Spc, a resistor Ra, a resistor Rb, a resistor Rc and a control protection system. The method has stronger line power flow regulation capability, is higher in power flow regulation speed, has certain reactive compensation capability, and can realize interconnection of alternating current distribution networks. Benefited from the power characteristic of the series converter, the rated power of the required series converter is far less than the rated transmission power between the distribution networks, so that the manufacturing cost of the series compensation hybrid flexible interconnection device is lower than that of a back-to-back converter based on the multi-level technology.

The invention discloses an energy-saving method for a crane. The energy-saving method comprises the following steps: acquiring a voltage working range of a direct-current bus of a crane frequency converter and setting a voltage threshold value; constructing an energy-saving recovery system of the crane; setting an operation mode of the energy-saving recovery system of the crane; setting control logic of automatic opening and closing of the switch unit in the working mode; and the energy-saving recovery system of the crane is operated for charging and discharging. By utilizing the characteristics that the high-power nickel-metal hydride battery has the service life of over million times of shallow charging and shallow discharging and has no explosion and fire risk, the high-power nickel-metal hydride battery recovery device is directly hung on a direct-current bus of a frequency converter, so that transformation conversion is avoided, efficient recovery of regenerated electric energy of the crane and system simplification are realized, and the cost is reduced. The one-time purchase cost of direct-current conversion and battery management equipment is reduced, and the energy-saving efficiency of the crane is improved.

The invention provides a high-frequency-conversion transformer, and belongs to the technical field of electromagnetism, the transformer comprises two pairs of magnetic cores which are of an annular structure and are arranged in parallel; the primary winding is wound on the magnetic core; the secondary winding comprises a row of U-shaped copper blocks arranged in an array mode, two supporting arms of each U-shaped copper block are arranged at the annular hollow positions of the two magnetic cores in a penetrating mode respectively, and the supporting arms, penetrating out of the same side of the magnetic cores, of all the U-shaped copper blocks are connected with the same first conductive plate. By using the scheme provided by the invention, the leakage inductance can be reduced, the loss is reduced and the power density is improved.