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Proportional control

About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.


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Proceedings ArticleDOI
10 Apr 2013
TL;DR: The computational intelligence based technique like PSO is more efficient and fast technique for optimization of different gains in load frequency control and the controller gives the improved dynamic performance for three area network with Thermal -- Wind-Hydro power plants.
Abstract: The automatic generation control (AGC) of three unequal interconnected Thermal, Wind and Hydro power plant has been designed with PI controller. Further computational intelligent technique Particle Swarm Optimization and conventional Gradient Descent technique have been used to improve the performance of Automatic Generation Control (AGC) system. The reheat turbine for thermal area and appropriate generation rate constraint (GRC) have been considered for thermal area. Particle swarm optimization (PSO) technique and Gradient Descent methods are used to simultaneously optimize the proportional gain (Kp), integral gains (Ki), speed regulation parameter (Ri) and frequency bias (Bi) parameter of different areas. Most of the literature for AGC used classical approach based on integral squared error (ISE) technique etc. for optimal selection of controller parameters. This is a trial and error method; extremely time consuming when several parameters have to be optimized simultaneously. The computational intelligence based technique like PSO is more efficient and fast technique for optimization of different gains in load frequency control. Further the performance of PSO is better than GD method for optimization of various parameters and the controller gives the improved dynamic performance for three area network with Thermal -- Wind-Hydro power plants. MATLAB/SIMULINK is used as a simulation tool.

16 citations

Proceedings ArticleDOI
01 Oct 2006
TL;DR: The simulation results in controlling the level processes by using the fuzzy I-PD controller with the same parameters (proportional gain, integral gain and derivative gain) as the conventional I- PD controller are shown.
Abstract: This paper introduces a level control system using a fuzzy I-PD controller. The proposed controller composes of Mamdani fuzzy I and Mamdani fuzzy PD controllers and is adjusted to meet the desired control system performances both in transient state and steady state. The simulation results in controlling the level processes by using the fuzzy I-PD controller with the same parameters (proportional gain, integral gain and derivative gain) as the conventional I-PD controller are shown in this paper.

16 citations

Journal ArticleDOI
TL;DR: In this article, a RC controller is proposed to track the dc component and restrain the low-frequency even-order ac harmonics, which can distort the arm currents, increase the power loses, and cause higher current stresses on the semiconductor devices.
Abstract: Modular multilevel converters (MMCs) have emerged as the most promising topology for high and medium voltage applications for the coming years. However, one particular negative characteristic of MMCs is the existence of circulating current, which contains a dc component and a series of low-frequency even-order ac harmonics. If not suppressed, these ac harmonics will distort the arm currents, increase the power loses, and cause higher current stresses on the semiconductor devices. Repetitive control (RC) is well known due to its distinctive capabilities in tracking periodic signals and eliminating periodic errors. In this paper, a novel circulating current control scheme base on RC is proposed to effectively track the dc component and to restrain the low-frequency ac harmonics. The integrating function is inherently embedded in the RC controller. Therefore, the proposed circulating current control only parallels the RC controller with a proportional controller. Thus, conflicts between the RC controller and the traditional proportional integral (PI) controller can be avoided. The design methodologies of the RC controller and a stability analysis are also introduced. The validity of the proposed circulating current control approach has been verified by simulation and experimental results based on a three-phase MMC downscaled prototype.

16 citations

Proceedings ArticleDOI
Fei Liu1, Xiaoming Zha1
17 May 2009
TL;DR: In this paper, a three-phase grid-connected inverter with LCL filter is theoretically analyzed, and the corresponding state-space mathematic model is established, and a hybrid controller incorporating proportion resonant control and state feedback pole-assignment control is proposed for the inverter.
Abstract: Grid-connected inverters are widely used in the distribution generation (DG) systems for the conversion of renewable energies. These inverters are usually connected to the utility grid through LCL filter to reduce the current harmonics injected to the grid. A LCL network, which can achieve reduced levels of harmonic distortion at low switching frequencies with less inductance, is a good alternative. In this paper, a three-phase grid-connected inverter with LCL filter is theoretically analyzed, and the corresponding state-space mathematic model is established. Furthermore, a hybrid controller incorporating proportion resonant control and state feedback pole-assignment control is proposed for the inverter. Simulation results of the converter with LCL filter are provided to verify the validity of the proposed controller.

16 citations

Journal ArticleDOI
TL;DR: In this paper, a control using Proportional and/or Derivative feedback (PD-control) is applied on a piecewise linear beam system with a flushing one-sided spring element for steady-state vibration amplitude mitigation.
Abstract: A control using Proportional and/or Derivative feedback (PD-control) is applied on a piecewise linear beam system with a flushing one-sided spring element for steady-state vibration amplitude mitigation. Two control objectives are formulated: (1) minimize the transversal vibration amplitude of the midpoint of the beam at the frequency where the first harmonic resonance occurs, (2) achieve this in a larger (low) excitation frequency range, where the lowest nonlinear normal mode dominates the response. Experimentally realizable combinations of PD-control are evaluated for both control objectives. Eventually objective (1) is realized by applying proportional control only, whereas derivative control is selected to realize objective (2). The vibration reduction that is achieved in simulations and validated by experiments is very significant for both objectives. Current results obtained with active PD-control are compared with earlier results obtained using a passive dynamic vibration absorber.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202217
202162
2020110
2019150
2018150