Hardware in the loop experimental study for the combined cooling, heat and power system controller

Abstract

ABSTRACTDistributed power supply system has the advantages of energy saving, environmental protection, high reliability, high stability and so on. The combined cooling, heat and power (CCHP) system based on gas turbine is a distributed energy supply system which adopts the strategy of power cascade utilization. It can provide electric power, air conditioning chilled water and domestic hot water at the same time. In this paper, the construction scheme of the CCHP system based on gas turbine is proposed firstly. Afterward, a comprehensive dynamic model of the CCHP system based on gas turbine is established. The model consists of four mutually coupled sub-models. Then, the controller of the CCHP system is designed. In the operation mode of “electricity determines cold and heat“, three sets of PI algorithm with feedforward compensation are adopted to ensure the stability of combustion engine speed, temperature of chilled water outlet and domestic hot water outlet. Finally, a HIL simulation test of the CCHP system based on gas turbine is carried out. The test results show that the speed overshoot does not exceed 0.5% when the gas turbine is unloaded. The temperature of chilled water outlet of bromine cooler can achieve stable control. The temperature of domestic hot water outlet has a small overshoot and no steady state error. Therefore, the correctness of the control algorithm, the feasibility and effectiveness of the controller are verified.