Topic
Bang–bang control
About: Bang–bang control is a research topic. Over the lifetime, 943 publications have been published within this topic receiving 16064 citations. The topic is also known as: on/off controller.
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TL;DR: In this paper, a point absorber WEC employing a hydraulic/electric power take-off system is formulated as an optimal control problem with a disturbance input (the sea elevation) and with both state and input constraints.
150 citations
TL;DR: An improved ramp comparator is proposed in which the current error signals are compared to three 120/spl deg/ phase-shifted triangular waveforms and this eliminates the zero voltage vector applied to the inverter and reduces the inherent amplitude and phase errors.
Abstract: Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC drives because they give high dynamic responses in such systems. This paper presents a comparative study of several current controllers. Particular attention is paid to the hysteresis controller and the ramp-comparator controller, due to their simplicity and widespread use. An improved ramp comparator is proposed in which the current error signals are compared to three 120/spl deg/ phase-shifted triangular waveforms. This eliminates the zero voltage vector applied to the inverter and reduces the inherent amplitude and phase errors. Computer simulations are used to compare the performances. Fast Fourier transform technique is used to show the power spectrum of the current waveforms. Experimental results validate the simulated performances.
143 citations
TL;DR: In this article, an efficient algorithm, called the time-optimal switching (TOS) algorithm, is proposed for the time optimal switching control of nonlinear systems with a single control input, which is formulated in the arc times space, arc times being the durations of the arcs.
Abstract: An efficient algorithm, called the time-optimal switching (TOS) algorithm, is proposed for the time-optimal switching control of nonlinear systems with a single control input. The problem is formulated in the arc times space, arc times being the durations of the arcs. A feasible switching control, or as a special case bang-bang control, is found using the STC method previously developed by the authors to get from an initial point to a target point with a given number of switchings. Then, by means of constrained optimization techniques, the cost being considered as the summation of the arc times, a minimum-time switching control solution is obtained. Example applications of the TOS algorithm involving second-order and third-order systems are presented. Comparisons are made with a well-known general optimal control software package to demonstrate the efficiency of the algorithm.
139 citations
TL;DR: In this paper, the optimal regulator problem is formulated as a scalar control function minimization problem for quadratic performance index (QPI), where the objective function minimizes the functional for the optimal index.
Abstract: Optimal regulator problem, where a scalar control function is found, which minimizes the functional for quadratic performance index
133 citations
18 Jun 1995
TL;DR: In this article, an application of sliding-mode combined with state-feedback tracking principle to control a buck converter was introduced, where the derivation of the control law was completely based an the fundamental tracking control laws, using the statefeedback and bang-bang control approaches.
Abstract: This paper introduces an application of sliding-mode combined with state-feedback tracking principle to control a buck converter. Instead of following an empirical method to obtain the sliding surface equation for the on-off bang-bang switching, the derivation of the control law is completely based an the fundamental tracking control laws, using the state-feedback and bang-bang control approaches. The resulting equation, if being reduced for the case of having a constant voltage reference, is similar to the sliding equation used in previous work. The control concept has proven to be more general, and can be applied to the case of having the output voltage tracking a time-varying reference signal. >
129 citations