Variable-air-volume (VAV) air-conditioning system is a multi-variable system and has multi coupling control loops. While all of the control loops are working together, they interfere and influence each other. A multiv...Variable-air-volume (VAV) air-conditioning system is a multi-variable system and has multi coupling control loops. While all of the control loops are working together, they interfere and influence each other. A multivariable decoupling PID controller is designed for VAV air-conditioning system. Diagonal matrix decoupling method is employed to eliminate the coupling between the loop of supply air temperature and that of thermal-space air temperature. The PID controller parameters are optimized by means of an improved genetic algorithm in floating point representations to obtain better performance. The population in the improved genetic algorithm mutates before crossover, which is helpful for the convergence. Additionally the micro mutation algorithm is proposed and applied to improve the convergence during the later evolution. To search the best parameters, the optimized parameters ranges should be amplified 10 times the initial ideal parameters. The simulation and experiment results show that the decoupling control system is effective and feasible. The method can overcome the strong coupling feature of the system and has shorter governing time and less over-shoot than non-optimization PID control.展开更多
The duct static pressure reset (DSPR) control method is a popular modern control method widely applied to variable air volume (VAV) systems of commercial buildings. In this paper, a VAV system simulation program was u...The duct static pressure reset (DSPR) control method is a popular modern control method widely applied to variable air volume (VAV) systems of commercial buildings. In this paper, a VAV system simulation program was used to predict the system performance and zone air temperature of two kinds of layouts that were applied to a typical floor of an existing building office in Hong Kong. The position where the static pressure sensor was placed should affect the zones temperature and energy consumption. The comparison of predictions of the two kinds of layouts indicates that with the same DSPR control method the layout of the air duct might influence the fan control result and energy savings.展开更多
目前,空调房间所配置的风机型变风量末端装置(Variable Air Volume Box,VAV-Box)往往采用整数阶PID或PID-PI串级的调节方式,会导致室温控制的稳态误差和超调量均较大以及室内静压波动的问题。鉴于此,本文提出了风机型VAV-Box室温PI^λD^...目前,空调房间所配置的风机型变风量末端装置(Variable Air Volume Box,VAV-Box)往往采用整数阶PID或PID-PI串级的调节方式,会导致室温控制的稳态误差和超调量均较大以及室内静压波动的问题。鉴于此,本文提出了风机型VAV-Box室温PI^λD^μ-室内送风量PI^λ串级控制策略和修正的人群搜索算法实施控制器参数整定的设计理念。首先,结合空调工艺要求和自动控制技术,对风机型VAV-Box作用下的室温被控对象、室内温度和室内送风量测量变送器、室温PI^λD^μ控制器、室内送风量PI^λ控制器、变频器和送风机分别进行建模;其次,构建修正的人群搜索算法对PI^λD^μ和PI^λ两个控制器的8个参数进行整定,获取最佳值;最后,借助MATLAB工具,对该串级调节系统进行组态和数值模拟其控制效果。结果表明:基于修正的人群搜索算法的PI^λD^μ和PI^λ控制器参数整定和该串级调节系统在理论上是可行的,且相应的室温控制性能指标满足空调工艺的相关要求。展开更多
基金Supported by Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education of China
文摘Variable-air-volume (VAV) air-conditioning system is a multi-variable system and has multi coupling control loops. While all of the control loops are working together, they interfere and influence each other. A multivariable decoupling PID controller is designed for VAV air-conditioning system. Diagonal matrix decoupling method is employed to eliminate the coupling between the loop of supply air temperature and that of thermal-space air temperature. The PID controller parameters are optimized by means of an improved genetic algorithm in floating point representations to obtain better performance. The population in the improved genetic algorithm mutates before crossover, which is helpful for the convergence. Additionally the micro mutation algorithm is proposed and applied to improve the convergence during the later evolution. To search the best parameters, the optimized parameters ranges should be amplified 10 times the initial ideal parameters. The simulation and experiment results show that the decoupling control system is effective and feasible. The method can overcome the strong coupling feature of the system and has shorter governing time and less over-shoot than non-optimization PID control.
文摘The duct static pressure reset (DSPR) control method is a popular modern control method widely applied to variable air volume (VAV) systems of commercial buildings. In this paper, a VAV system simulation program was used to predict the system performance and zone air temperature of two kinds of layouts that were applied to a typical floor of an existing building office in Hong Kong. The position where the static pressure sensor was placed should affect the zones temperature and energy consumption. The comparison of predictions of the two kinds of layouts indicates that with the same DSPR control method the layout of the air duct might influence the fan control result and energy savings.
文摘目前,空调房间所配置的风机型变风量末端装置(Variable Air Volume Box,VAV-Box)往往采用整数阶PID或PID-PI串级的调节方式,会导致室温控制的稳态误差和超调量均较大以及室内静压波动的问题。鉴于此,本文提出了风机型VAV-Box室温PI^λD^μ-室内送风量PI^λ串级控制策略和修正的人群搜索算法实施控制器参数整定的设计理念。首先,结合空调工艺要求和自动控制技术,对风机型VAV-Box作用下的室温被控对象、室内温度和室内送风量测量变送器、室温PI^λD^μ控制器、室内送风量PI^λ控制器、变频器和送风机分别进行建模;其次,构建修正的人群搜索算法对PI^λD^μ和PI^λ两个控制器的8个参数进行整定,获取最佳值;最后,借助MATLAB工具,对该串级调节系统进行组态和数值模拟其控制效果。结果表明:基于修正的人群搜索算法的PI^λD^μ和PI^λ控制器参数整定和该串级调节系统在理论上是可行的,且相应的室温控制性能指标满足空调工艺的相关要求。
