Control method and system for hybrid power system of double-shaft gas turbine

Abstract

The invention relates to a control method and system for a double-shaft gas turbine hybrid power system, the control method is applied to the double-shaft gas turbine hybrid power system, and the double-shaft gas turbine hybrid power system supplies power to an electricity load. The control method comprises the steps that the charge state of energy storage equipment in the double-shaft gas turbine hybrid power system is obtained; judging the charge state, and when the charge state is within a set threshold range, outputting a first control strategy; when the state of charge is smaller than or equal to the set threshold range, outputting a second control strategy; when the state of charge is greater than or equal to the set threshold range, outputting a third control strategy; and controlling the double-shaft gas turbine hybrid power system based on the first control strategy, the second control strategy and the third control strategy. According to the invention, the fuel economy of the double-shaft gas turbine is improved and the safe operation of a hybrid power system is ensured while the required power is ensured to be provided.

Description

technical field [0001] The invention relates to the field of hybrid power technology, in particular to a control method and system for a dual-shaft gas turbine hybrid power system. Background technique [0002] A hybrid power system refers to a system that has two or more power sources, and through related control devices, each power source can output energy individually or jointly. At present, a hybrid power system that realizes energy output by means of electric power is basically composed of a gasoline engine / diesel engine, a generator, and an energy storage device. Compared with the gasoline engine / diesel engine, the power-to-weight ratio of the twin-shaft gas turbine is higher, that is, the weight of the twin-shaft gas turbine is smaller than that of the gasoline engine / diesel engine under the condition of the same output power, and the structure is simpler and easier to maintain. Therefore, the hybrid power system based on the twin-shaft gas turbine has the advantage ...

AI Technical Summary

Problems solved by technology

However, the existing twin-shaft gas turbines have good fuel economy only when they work under the specified power state of the design point, and their fuel economy decreases sharply with the decrease of output power. Therefore, the existing hybrid power system based on twin-shaft gas turbines is Fuel economy is poor at off-design point power state, which offsets the advantages of high power-to-weight ratio of the system and limits the wide application of hybrid power systems based on twin-shaft gas turbines

[0003] Based on the above problems, the fuel economy of the twin-shaft gas turbine is improved by connecting the motor / generator between the high-pressure shaft and the low-pressure shaft of the twin-shaft gas turbine, and combining the control scheme. Abnormal working conditions of the shaft gas turbine, such as surge, etc.

Images