15 results about "AC/AC converter" patented technology

The utility model discloses a single-phase AC / AC converter which is used for realizing fine adjustment of output signals of a conversion circuit and improving the precision and stability of output AC signals. The circuit comprises a main control chip, a first sampling module, a second sampling module, a driving chip and a conversion circuit. The input end of the first sampling module and the input end of the second sampling module are used for receiving alternating current signals; the main control chip is connected with the output end of the first sampling circuit and the output end of the second sampling circuit; the output end of the main control chip is connected with the input end of the driving chip; the output end of the driving chip is connected with the input end of the conversion circuit, and the output end of the conversion circuit is used for outputting a final alternating current signal.

This invention provides a topology and control method for high and low voltage management of power grids based on a single-stage bidirectional AC / AC converter, relating to the field of voltage management technology. The topology includes a grid-side inductor, a load-side inductor, an energy storage capacitor, a first bridge arm, and a second bridge arm. The first bridge arm includes a first upper bridge arm and a first lower bridge arm, and the second bridge arm includes a second upper bridge arm and a second lower bridge arm. The first bridge arm is connected to the second bridge arm and the energy storage capacitor. The grid-side inductor is connected at the junction of the first upper and lower bridge arms, with the other end of the inductor connected to the grid output side, which is connected to the energy storage capacitor. The load-side inductor is connected at the junction of the second upper and lower bridge arms, connected to the load, and the load is connected to one end of the energy storage capacitor. This effectively reduces energy loss and improves the overall system operating efficiency. While achieving high and low voltage management of the power grid, it effectively solves the technical problems of low efficiency, large size, and short lifespan in existing technologies.

The invention discloses a non-electric-contact power supply circuit, a non-electric-contact power supply device and a non-electric-contact power supply circuit control method. The circuit comprises a transmitting sub-circuit and a receiving sub-circuit, wherein the transmitting sub-circuit is connected with an external power frequency power grid; the transmitting sub-circuit comprises an AC / AC converter and a transmitting coil which are electrically connected, and the current alternating current frequency of the transmitting coil is configured to be at least two orders of magnitude larger than the current frequency introduced from the external power frequency power grid so as to automatically correct the power factor on one side of the external power frequency power grid. The AC / AC converter is matched with the transmitting coil, the current frequency of the transmitting coil is configured to be far larger than the current frequency of the power grid, correction of the power factor on one side of the power grid is automatically achieved, compared with an electric energy transmission scheme in the related technology, the structure of the transmitting end is simplified, the electric energy conversion stage number is reduced, and the transmission efficiency is improved. The electric energy conversion efficiency is ensured, and the correction of the power factor can still be realized under the condition that a power factor correction assembly does not need to be arranged singly.

Provided in the present application is an AC / AC converter. The AC / AC converter comprises a first conversion unit, a matching unit and a second conversion unit which are sequentially connected in series, wherein the first conversion unit is used for generating a first half-wave voltage, and performing polarity inversion on the first half-wave voltage, so as to generate a first alternating-current voltage having alternating positive and negative polarities; the second conversion unit is used for generating a second half-wave voltage, and performing polarity inversion on the second half-wave voltage, so as to generate a second alternating-current voltage having alternating positive and negative polarities; and the matching unit is used for generating a first matching voltage, with the first matching voltage being the difference between the first half-wave voltage and the second half-wave voltage.

The application provides a V-Q double-layer control method and system of a primary AC / AC converter, and relates to the technical field of voltage management. The primary AC / AC converter is adopted to directly realize AC-to-AC conversion, improve energy conversion efficiency and simplify the system structure. By introducing the V-Q double-layer control mechanism, the reactive power regulation and the output voltage regulation are managed through independent control loops. When the grid reactive power fluctuates, the reactive power control loop can quickly respond and adjust the AC capacitor voltage, and the voltage control loop can ensure the stability of the output voltage on the load side. The decoupled control strategy makes the voltage regulation more direct and flexible, especially in the case of weak grid or frequent load changes, which can provide more stable and reliable voltage support. Through the double-layer control, the problems of complex control, resonance risk and difficulty in simultaneously realizing efficient and flexible voltage regulation that may exist in the traditional SVG can be effectively avoided.

The invention provides a network construction type electric hydrogen ammonia fusion micro-grid system, a control method and equipment thereof and a medium, and belongs to the technical field of micro-grids. In the system, a network-forming type lithium battery energy storage subsystem discharges electricity to a high-voltage alternating-current bus, an ammonia fuel power generation subsystem generates electricity to a low-voltage alternating-current bus through an AC / AC converter, an alternating-current load takes electricity to the low-voltage alternating-current bus, and a photovoltaic power generation subsystem and a fuel cell power generation subsystem generate electricity to a direct-current bus through an energy router. The hydrogen production subsystem and the direct-current load take electricity from the direct-current bus through the energy router, the super-capacitor energy storage subsystem and the electrochemical energy storage subsystem take electricity from the direct-current bus or discharge electricity from the direct-current bus through the energy router, and the super-capacitor energy storage subsystem discharges electricity from the network-forming type lithium battery energy storage subsystem through an independent contactor. The DC bus is connected with the low-voltage AC bus through the energy router, and the high-voltage AC bus is connected with the low-voltage AC bus through the transformer. The operation reliability of the system can be improved.

The examples described here provide a circuit that includes a power electronics converter located in a vehicle, wherein the power electronics converter is designed to receive alternating current (AC) electrical power from an AC mains source and to supply AC electrical power to an AC load outside the vehicle. The power electronics converter includes an AC / AC converter comprising a rectifier and an inverter, the rectifier being electrically connected to the inverter via a direct current (DC) connection. The circuit further includes a vehicle-side charging module that is electrically connected to the power electronics converter and a battery located in the vehicle.The power electronics converter provides vehicle-to-load functionality by supplying AC electrical power to the AC load as a 120 Vac output and / or a 240 Vac output.

The utility model relates to the technical field of electric vehicle charging, in particular to a charging system based on motor winding multiplexing. Comprising a three-level active midpoint clamping inverter, a power battery pack is electrically connected to the direct current side of the three-level active midpoint clamping inverter, a motor winding is electrically connected to the three-phase output end of the alternating current side of the three-level active midpoint clamping inverter, and an AC / AC converter is electrically connected to the other side of the motor winding. The system further comprises a mode switching module which is arranged between the motor winding and the AC / AC converter and used for mode switching and enabling energy to flow in two directions, and the system integration degree is remarkably improved.

The invention discloses a combined AC / AC converter control method, and relates to the technical field of power electronic converter control. The combined AC / AC converter is formed by combining a passive rectifier bridge, a Boost converter and a DC / AC converter. Wherein the Boost converter is used for intermediate bus voltage control and AC input side power factor correction; the DC / AC converter dynamically divides carrier wave areas according to passive rectification output voltage and intermediate bus voltage amplitude, dynamically adjusts modulation wave amplitude in combination with alternating current input and output voltage phase relation, realizes rectification output current amplitude limiting and circulation-free power control while completing alternating current output voltage control, and further realizes active power optimization. Based on the control method, cooperative control of the Boost converter and the DC / AC converter can be achieved, the combined AC / AC converter has the technical advantages of being small in power conversion stage number and excellent in power factor, the system conversion efficiency can be effectively improved, the system cost can be effectively reduced, the power supply quality can be effectively improved, and the system operation reliability can be effectively improved.

The application provides a network-constructed electric hydrogen-ammonia integrated micro-grid system and a control method, equipment and medium thereof, and belongs to the technical field of micro-grid. In the system, a network-constructed lithium battery energy storage subsystem discharges to a high-voltage alternating current bus, an ammonia fuel cell power generation subsystem generates power to a low-voltage alternating current bus through an AC / AC converter, an alternating current load draws power from the low-voltage alternating current bus, a photovoltaic power generation subsystem and a fuel cell power generation subsystem both generate power to a direct current bus through an energy router, a hydrogen production subsystem and a direct current load both draw power from the direct current bus through the energy router, a super capacitor energy storage subsystem and an electrochemical energy storage subsystem both draw or discharge power from the direct current bus through the energy router, the super capacitor energy storage subsystem discharges to the network-constructed lithium battery energy storage subsystem through an independent contactor, the direct current bus is connected to the low-voltage alternating current bus through the energy router, and the high-voltage alternating current bus is connected to the low-voltage alternating current bus through a transformer. The application can improve the operation reliability of the system.

The application provides a composite energy storage power supply system for grid peak shaving and frequency modulation, comprising a renewable energy power generation device; a battery energy storage device, a first input end of the battery energy storage device being connected with a power output end of the renewable energy power generation device through a DC / DC converter; a first DC / AC converter, a power output end of the battery energy storage device being connected with a common AC bus through the first DC / AC converter; a second DC / AC converter, the power output end of the renewable energy power generation device being connected with the common AC bus through the second DC / AC converter; a solar thermal power generation device, a power output end of the solar thermal power generation device being connected with the common AC bus through an AC / AC converter; and a heat storage device, the heat storage device being connected with the solar thermal power generation device and being capable of storing and releasing heat with the solar power generation device. The composite energy storage power supply system provided by the application can take into account stability, reliability, economy and environmental protection when used for grid peak shaving and frequency modulation.

This invention provides an integrated magnetically controlled transformer system and its method for stabilizing output voltage. The system includes a main transformer, an auxiliary transformer, an AC / AC converter, and a controller. The input of the main transformer is connected to a high-voltage power grid, and its output provides a main voltage containing disturbance components. The primary side of the auxiliary transformer is connected to the output of the AC / AC converter, and its secondary side is connected in series to the output circuit of the main transformer. The input of the AC / AC converter is connected to the output side of the main transformer. The controller samples the output voltage of the main transformer in real time and compares it with a set voltage value to generate a command signal for controlling the AC / AC converter. This allows the adjustable compensation voltage to cancel out the disturbance components in the main voltage in real time, thereby stabilizing the total output voltage after series superposition at the set voltage value. This system effectively isolates voltage disturbances on the power grid side, ensures voltage stability on the load side, has a fast response speed, high voltage regulation accuracy, and a compact and reliable structure.

The application provides a multifunctional electric section switch for a transformer substation and a control method thereof, comprising a back-to-back three-phase full-bridge AC / AC converter and a parallel switch; voltage output ends of the three-phase full-bridge AC / AC converter are respectively connected with filter inductors and the parallel switch; the parallel switch comprises a plurality of anti-parallel controllable high-frequency switches; the three-phase full-bridge AC / AC converter comprises a plurality of anti-parallel diode controllable high-frequency switches; and the technical scheme can effectively solve the problem of long-time power failure of the electric equipment of the transformer substation caused by instantaneous faults.

The invention discloses a single-phase or three-phase on-load voltage regulation circuit of an industrial frequency transformer coupled AC-AC converter. The single-phase or three-phase on-load voltage regulation circuit comprises n or 3n AC-AC converters with a stepped voltage regulation function, a single-phase or three-phase industrial frequency transformer and a special coupling mode between the single-phase or three-phase industrial frequency transformer and the AC-AC converters. Two terminals of the primary side winding are led out to form an external port, the secondary side isolation winding is connected with alternating current input ports of the n or 3n alternating current-alternating current converters, output ports of the n or 3n alternating current-alternating current converters are sequentially connected in series, and the terminals are led out to form an on-load voltage regulation port. The problems that a mechanical switch contact is short in service life and a sensitive load is powered off are fundamentally solved, and meanwhile the system cost is effectively reduced; the turn ratio of each transformer can be flexibly set according to actual requirements, so that differentiated and refined voltage regulation requirements in different application scenes can be met; the system has good expandability, and can be flexibly adapted to application scenes of different power levels through series-parallel combination.

The examples described here show a circuit comprising a power electronics converter located in a vehicle. The power electronics converter serves to receive AC electrical power from an AC mains source and to supply AC electrical power to an AC load outside the vehicle. The power electronics converter includes an AC / AC converter. The circuit further includes an on-board charging module electrically connected to the power electronics converter and a battery located in the vehicle. The circuit also includes a controller for controlling the power electronics converter and the on-board charging module. The power electronics converter provides vehicle-to-load functionality by supplying AC electrical power as an output from a 120 Vac output and / or a 240 Vac output to the AC load.