A multi-phase high-power power generation-conversion integrated system and its control method

Abstract

The invention discloses a multi-phase and high-power generation-conversion integrated system and a control method thereof. The multi-phase and high-power generation-conversion integrated system comprises a modular multilevel inverter and a multi-phase permanent magnet generator, wherein a three-phase structure is adopted by the modular multilevel inverter; each phase is formed by connecting an upper bridge arm and a lower bridge arm in series; each bridge arm is formed by connecting n sub-modules and a filter inductor in series; connection points of the filter inductors of the upper bridge arms and the lower bridge arms form output ends of the bridge arms of the corresponding phases to be connected to a public power network; each sub-module comprises a three-phase PWM rectifier, a capacitor and two series-connected IGBT tubes; 6n three-phase windings of the multi-phase permanent magnet generator are connected to AC ends of 6n three-phase PWM rectifiers of the modular multilevel inverter in a manner of one-to-one correspondence; and a DC output end of each three-phase PWM rectifier is connected with the corresponding capacitor in parallel and also connected with two ends of two corresponding series-connected IGBT tubes in parallel. The multi-phase and high-power generation-conversion integrated system has a modular structure design and a good control characteristic, and flexible connection between a power generation system and the power network is easy to implement.

Description

technical field [0001] The patent of the invention belongs to the technical field of power generation, and in particular relates to a multi-phase high-power power generation-conversion integrated system and a control method thereof. Background technique [0002] From the perspective of global energy supply, the gradual depletion of fossil energy is a fact. In order to maintain the sustainable development of the global economy, how to ensure sufficient energy supply, how to develop various forms of energy, and how to directly convert these energies into electrical energy that can be directly used by human beings is an important issue facing all mankind. As the core equipment for converting various forms of clean and renewable energy such as thermal energy, wind energy, and tidal energy into electrical energy, generators play a key role in the process of realizing electromechanical energy conversion. The application fields of generators are not limited to traditional thermal ...

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Problems solved by technology

However, this topology also has disadvantages such as complex system structure, difficult control, large number of full-control devices, high cost, and the need to use large-capacity filters on the motor side or grid side.

In addition, this topology generally needs to be boosted by a step-up transformer before it can be connected to the grid, thus resulting in a complex system structure and a substantial increase in device size and cost

Due to the limitation of converter capacity and other reasons, its application in the grid connection of larger power plants is not the optimal solution

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