Static pressure control method of variable air volume (VAV) air-conditioning system fan on basis of iterative learning

Abstract

The invention discloses a static pressure control method of a variable air volume (VAV) air-conditioning system fan on the basis of iterative learning and proposes that an iterative learning control algorithm is applied to the static pressure control of the VAV air-conditioning system fan. The static pressure control method comprises the following steps: firstly, establishing a state-space model of the VAV air-conditioning system fan, furthermore, converting the continuous state-space model into a discrete state-space model of a system, and verifying the astringency of the control method on the basis of the model to obtain a system astringency condition; and secondarily, according to the obtained system astringency condition, designing a specific iterative learning algorithm, and proving the effectiveness of the algorithm through a simulation experiment. Proved theoretically, the static pressure control method has the characteristics that the steady-state performance and the dynamic performance of the system are greatly improved than a traditional PID (Proportion Integration Differentiation) algorithm, and the static pressure control method has important theoretical guiding significance and practical value.

Description

technical field [0001] The invention relates to a new method for controlling the static pressure of fans in variable air volume air conditioning systems, in particular to a method for controlling the static pressure of fans in variable air volume air conditioning systems based on iterative learning Background technique [0002] With the development of the economy and the improvement of the economic level, the application of air-conditioning systems is becoming more and more extensive. Air-conditioning systems can be seen in commercial, industrial, and ordinary residential areas. The ensuing problem is: the energy consumption of the air conditioning system is becoming more and more prominent. China's building energy consumption (BEC) has been increasing at an annual rate of 10% in the past two decades. By 2004, the proportion of BEC in all energy consumption had reached 20.7%, and it is still growing. A survey report shows that in southern cities in China, energy consumption...

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Problems solved by technology

The ensuing problem is: the energy consumption of the air conditioning system is becoming more and more prominent

However, in the constant static pressure control mode, the traditional PID control method is adopted. In order to ensure that the static pressure of the air supply is constant at the set static pressure value, the proportional control effect of the system is strong, which leads to a large change in the speed of the fan during the adjustment process. Causes a strong overshoot in the air supply system

From the characteristics of the fan, it can be known that the energy consumption of the fan depends on the flow rate of the fan, the outlet pressure of the fan, and the running time, so when the system overshoots and fluctuates, it will increase the energy consumption of the air supply system and the energy consumption of the variable air volume air conditioning system

At the same time, the commonly used PID control method cannot completely eliminate the influence of repeated disturbances on the system, and the tracking effect on the static pressure value is not good

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