Abstract
This paper presents a rotation speed estimation and an indirect speed control method for a turbine-generator in a grid-connected 3-phase electrical power conversion system of an organic Rankine cycle (ORC) generation system. In addition to the general configuration mechanism and control techniques that are required in the grid-connected ORC power generation system, the indirect speed control method using the grid-side electric power control and the speed estimation method is proposed for the proper speed control of turbine-generators. The speed estimation method utilizes a digital phase-locked loop (PLL) method that uses a state observer to detect the positive-sequence voltages. A 10 kW system where a Motor-Generator set is used as a turbine simulator and a 23 kW actual system for the grid-connected ORC power generation were designed and manufactured, respectively. This paper includes various experimental results obtained from field tests conducted on actual installed ORC systems.
Highlights
As part of the renewable energy generation system, researches on power generation systems using heat sources have been developed
In the organic Rankine cycle (ORC) generation system, the output power of the turbine is converted into electric power by the generator, and it transferred to the grid network via an electric power conversion system
Small-scale system, where aduring motor the simulates the turbine and is used for the confirmation the proposed control method developing stage. This system consists of two grid-connected electric power conversion systems and simulates the turbine and is used forof thetwo confirmation of the proposedpower controlconversion method during the and developing stage
Summary
As part of the renewable energy generation system, researches on power generation systems using heat sources have been developed. The generator terminal voltage has a distorted distorted waveform caused by the of conduction of the diode rectifier resultsripple in a waveform caused by the conduction the diode rectifier [5,15,18], which[5,15,18], results inwhich a significant significant ripple component of the estimated speed. Together, it leads to a great challenge for the component of the estimated speed.
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