Variable speed heat pump systems offer capabilities for advanced control strategies that coordinate the operation of compressor, valve and fans to maximize efficiency while tracking changing heating and cooling loads. However, advanced multivariable controllers can be more complex to design, implement and troubleshoot. This paper presents energy optimal coordinated control strategies, with varying levels of complexity, ranging from decoupled PID control to Linear Quadratic Gaussian (LQG) multivariable control. The advantages and disadvantages of the three strategies are analyzed and compared in simulation and experiment.
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