A control device for a grid-connected low-temperature waste heat power generation system

Abstract

The invention discloses a control device and a method for a grid-combined type low-temperature waste heat generating system. The control device comprises an organic working medium rankine cycle system control device, a converter control device and a human-computer interface, wherein the control device is respectively connected with an organic working medium rankine cycle system and a back-to-back converter; the coordination control is performed on the whole system through the communication between the control devices; the human-computer interface is connected with the converter control device and is used for controlling the running and display state of the whole system; the organic working medium rankine cycle system control device comprises an organic working medium liquid level closed-loop control module which is used for controlling the organic working medium rankine cycle; the converter control device comprises a sequential control module, a machine-side net-side control module, a maximum power capturing module and a low voltage ride through module. The control device provided by the invention can be friendly connected with the power grid, can realize the safe, reliable and efficient running of the grid-combined type low-temperature waste heat generating system and has the advantage of high waste heat utilization efficiency.

Description

technical field [0001] The invention belongs to the technical field of grid-connected low-temperature waste heat recovery, and relates to a control device of a grid-connected low-temperature waste heat power generation system. The low-temperature waste heat can be realized by coordinating the design of the control device and the converter control device of the organic working fluid Rankine cycle system Continuous, stable and efficient grid-connected power generation of the power generation system. Background technique [0002] my country has a vast territory and abundant geothermal resources. Although some geothermal resources have been initially utilized, they only stay at the level of direct utilization (hot springs and other daily use), which has the disadvantage of low energy utilization efficiency. At the same time, sulfuric acid, cement, glass, steel and other manufacturing plants emit a large amount of waste heat, waste gas, waste smoke and other waste heat resources,...

AI Technical Summary

Problems solved by technology

[0003] The traditional waste heat power generation system adopts the constant speed and constant frequency power generation method, and the generator is directly connected to the grid. Since the highest operating efficiency can only be achieved by fixed operation at a certain speed, when the heat source conditions change, the generator and expander will deviate from the optimal speed. Optimum operating speed, resulting in reduced operating efficiency

When the grid voltage fails, the fault will be directly transmitted to the generator, causing the generator to fail

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