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Event-Based Generalized Predictive Control
Published in Marek Miskowicz, Event-Based Control and Signal Processing, 2018
Andrzej Pawlowski, José Luis Guzmán, Manuel Berenguel, Sebastián Dormido
and IAEP values for individual days are close to zero, which means that the obtained control performance is the same as a time-based technique. Interesting results are obtained for Pu = 1, where IAE increases by about 15.9%, but an events reduction of the order of 74% is obtained. It is observed that a direct relationship can be established between the actuator deadband value and the control performance. When the deadband increases, the control performance decreases. A similar relationship can be found between the number of process input events and the deadband value. However, for Pu = 2, the obtained control results are characterized by important precision loss, and for this reason, the optimal deadband value depends on the individual process characteristics. This facts allows one to use a Pu as an additional tuning parameter to establish a relationship between control performance and the number of system events. Overall, good control performance, even for a large value of Pu, is achieved because the actuator deadband is considered in the optimization procedure. This fact is verified by the NE measurement. On the contrary, disturbance dynamics have a strong influence on the control performance and the number of events that are obtained for individual simulation days.
D
Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
deadbeat 2-D observer high frequency. Most DC-DC converters are pulse-width modulated (PWM), while resonant or quasi-resonant types are found in some applications. Commonly used topologies include the buck converter, boost converter, buckboost converter, ' and Cuk converter. Isolation can be achieved by insertion of a high frequency transformer. DC-free code DCA See balanced code. de-regulation the removal of some government controls on public utilities, generally including the unbundling of certain services, the dismantling of vertically-integrated utilities, and the introduction of competition among various utility companies for customer services. dead band (1) the portion of the operating range of a control device or transducer over which there is no change in output. (2) referring to an automatic controller behavior, a range of values of the controlled variable in which no corrective action occurs. This type of controller behavior is responsible for the time lag, called dead zone lag, which can cause instability of the controlled system if other conditions are present. Also known as dead zone. dead end an installation in which an electric power line terminates at a pole or tower, typically for purposes of structural stabilty. dead man (1) a stand on which to rest a utility pole when setting the pole by hand. (2) a buried log used as a guy anchor. dead-end shoe a fixture for securing a wire or strain insulator to a utility pole. dead tank breaker a power circuit breaker where the tank holding the interrupting chamber is at ground potential. Oil circuit breakers, for example, are typically dead tank breakers. dead zone See dead band. a system described by
Controlling Prime Movers
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
Deadband is the amount of change a control system will allow in a controlled parameter before it responds with a correction. The smaller the deadband, the more accurately a parameter is controlled. Limiting a parameter allows it to vary within a specified range. A parameter may be limited in its maximum value, minimum value, or both.
Modelling of a water-to-air variable capacity ground-source heat pump
Published in Journal of Building Performance Simulation, 2018
Samuel Bouheret, Michel Bernier
The manufacturer recommends to control this heat pump using a proportional-integral (PI)-type controller as shown in Figure 2. The controller has two main roles: determining the required operating mode (heating, cooling, DHW production or simultaneous cooling and DHW production) and controlling the compressor frequency for the current operating mode. The controller also commands the flow rate at which the GHX pump and hot water tank circulator as well as the fan need to operate. The water flow rates are calculated based on the source and DHW ΔTs and the air flow rate per unit capacity set by the user. The controlled temperatures are presented in Figure 2, and the controller logic is summarized in Table 2. The controller determines the required operation mode based on the top and bottom hot water tank temperatures, Tt, and Tb, as well as the house temperature, Tr. The values of Tsh, Tsc, Tst and Tsb are the set points for heating, cooling and top and bottom temperatures of the hot water tank, respectively. A 2 K dead band is applied to avoid control instabilities and too frequent mode-to-mode switching.
Improved PSO based automatic generation control of multi-source nonlinear power systems interconnected by AC/DC links
Published in Cogent Engineering, 2018
A dead band is considered as a neutral zone or dead zone and an interval of a signal domain or band where no action occurs. The system is “dead”—i.e. the output is zero. Dead band regions can be used in voltage regulators and other controllers to prevent oscillation or repeated activation-deactivation cycles. A form of dead band that occurs in mechanical systems, compound machines such as gear trains is backlash. It has been found that the backlash nonlinearity tends to produce a continuous sinusoidal oscillation with a natural period of about 2 s. An approximate value of dead band has been considered in present work as backlash of 0.05%.