Open-circuit fault detection device, converter controller, and energy conversion system and method

Abstract

A power conversion system (10) includes a converter system (14) for converting input power from a power source (12) and providing output power; a transformer (24) for providing voltage or current transformation of the output power and isolation between the converter system (14) and a load (18); and a converter controller (16). The converter controller (16) includes an open-circuit detection module (210) for receiving a first electrical signal (148. 52) and a second electrical signal (148, 152) measured at one side of the transformer (24); determining whether a difference value between the measured first and second electrical signals is smaller than a predetermined threshold value; and sending a control signal (168, 172) to cause the converter system (14) to reduce the magnitude of the output power upon determination that the difference value is smaller than the predetermined threshold value. The first and second electrical signals include current or voltage signals.

Description

technical field [0001] The embodiments disclosed in the present invention relate to an energy conversion system and method, in particular to a system and method for detecting an open circuit fault encountered by the energy conversion system. Background technique [0002] As we all know, due to their non-renewability, traditional energy sources including fossil fuels will be gradually exhausted in the foreseeable time frame, and their usage costs will gradually increase. In addition, the use of traditional non-renewable energy sources can also have adverse effects on the environment. Therefore, from the perspectives of cost and environmental protection, it is important for society to gradually increase the use of renewable energy, including solar power generation systems, fuel power generation systems, wind power generation systems, and hydropower or tidal power generation systems, to replace traditional energy sources. a trend of development. In the past, when the use of r...

AI Technical Summary

Problems solved by technology

However, maintaining a grid connection under fault conditions poses some problems

One of the problems is how to quickly and accurately detect the open-circuit fault, because if the open-circuit fault cannot be detected in time, the controller will respond incorrectly, so that one or more electronic devices or one or more Electronic devices or loads connected to the generator may be damaged by overcurrent or overvoltage problems caused by the open circuit fault

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