Free piston Stirling power generation system and control method

Abstract

The present invention provides a free piston Stirling power generation system and a control method. The system comprises a Stirling engine, a linear generator, a digital signal processor, a rectifier bridge, and a power switch. The power switch comprises a control converter and an inverter. The Stirling engine is connected to the linear generator which communicates with the input end of the rectifier bridge. The digital signal processor controls the rectifier bridge and the start or stop of the control converter and the inverter according to the received temperature and motion directions and the comparison of current and voltage values and preset values, the system start, power generation or stop is realized. The control method comprises data detection and the control of a system state according to the detected data, an electric energy two-way switching control function can be realized, the smooth switching of a power generation state is achieved, an engine collision problem is solved, and system output electric energy is converted into electric energy which is accordance with a grid-connected standard.

Description

technical field [0001] The invention relates to the technical field of Stirling engines, in particular to a free-piston Stirling power generation system and a control method. Background technique [0002] A linear generator is an electrical device that uses the linear motion of the mover to directly generate electric energy or uses electric energy to directly generate linear motion. The linear generator has the advantages of fast response, high efficiency, and high precision, and has become the current research field in the field of motor and its control hotspot. [0003] The Stirling engine generates power by expanding the gas when it is heated and compressing it when it is cooled. This is an external combustion engine that burns the fuel continuously, the evaporated expanded hydrogen (or helium) is used as the power gas to move the piston, and the expanded gas is cooled in the air-conditioning chamber, and this cycle process is repeated. Compared with internal combustion...

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Problems solved by technology

[0006] However, since the linear generator combined with the free-piston Stirling power generation system is a very complex and highly coupled system, in order to give full play to the advantages of the two, it is necessary to effectively avoid the collision problem caused by the overrun of the piston stroke, and it is necessary to solve how to start the entire power generation system smoothly It is necessary to solve the problem of seamless switching between start-up and power generation, and to ensure that the power generation quality of the power generation system can meet the requirements of relevant standards

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