8 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 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 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 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 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.