An AC power supply based on flywheel energy storage and its control method

Abstract

The invention discloses an AC power supply based on flywheel energy storage and a control method of the AC power supply. The device comprises a power module, a controller, a flywheel energy storing module, a switch and a load; the power module is connected with a load module through the switch; the flywheel energy storing module is connected in parallel with the load; the controller samples the power module and outputs, and a control signal is also output to control an inverter in the power module to act. The control method is characterized in that the controller samples to obtain output three-phase voltage of the inverter, the three-phase voltage is subjected to logical operation and processed by a limiter to obtain controlled target three-phase current and three-phase voltage, so as to a complete closed-loop control; in case of small load, the electric energy is converted into mechanical energy to be stored into a flywheel; in case of large load and even overload, the flywheel connected with a sensing motor releases the mechanical energy, and the mechanical energy is converted into the electric energy through the sensing motor so as to supply power to the load together with an AC power supply; therefore, the current in a branch of the AC power supply is reduced, the over-current is effectively prevented from being produced, and as a result, the normal running of the inverter is protected.

Description

technical field [0001] The invention relates to the technical field of AC power application, in particular to an AC power supply based on flywheel energy storage and a control method thereof. Background technique [0002] With the promotion of distributed power generation technology in the world, independent power supply systems are also more and more widely used. However, due to the isolation of the distributed generation system and the power grid, it is difficult to have a good follow-up ability in the case of large load changes. This directly causes the system to be difficult to work stably. In order to solve this problem, solutions in various ways have been proposed, but they mainly focus on the topology selection and control fields of AC power supply. [0003] Flywheel energy storage devices are also widely used in industry, mainly in fields where power distribution changes frequently, such as energy recovery of automobiles. At present, it is also used in the power s...

AI Technical Summary

Problems solved by technology

The most prominent point is that when the load changes in a large range, it is inevitable to generate overvoltage and overcurrent in the system. However, the capacity of the current inverter is limited. These overvoltage and overcurrent will cause damage to the inverter itself and its driving device. In order to suppress these overvoltages and overcurrents, some experts and scholars can effectively reduce these hazards by applying power electronics technology to the inverter itself.

But at the same time, the whole system is complicated, the control tends to be complicated, and the stability of the system is greatly reduced, which is extremely important in the field of industrial control.

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