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The installed power capacity of grid-connected wind energy conversion systems (WECSs) has increased exponentially around the world. The size of each unit is also increasing as they are becoming more affordable. The grid is a highly non-linear system due to wide spread use of power electronically switched loads and devices. Hence, the grid disturbances affect the output of the WECSs. This paper presents...
A Programmable Logic Controller (PLC) based power factor correction method for a 3-phase Induction Motor (IM) through switching of shunt capacitors is proposed in this paper. A 3 phase IM has a low power factor (pf) at no load as it draws large magnetizing current and the active power delivered to the motor is low, which is utilized to overcome the no-load losses. The PLC based power factor improvement...
In this paper a new single-phase multilevel inverter topology is presented. Proposed topology is capable of producing nine-level output voltage with reduce device counts. It can be done by arranging available switches and dc sources in a fashion such that the maximum combination of addition and subtraction of the input dc sources can be achieved. Comparison between the existing topologies shows that...
This paper proposes a multi-objective optimal control and switching strategy for floating offshore wind turbines when the wind speed can be approximately predicted. The system is modeled as a hybrid automaton with two modes corresponding to the turbine operation in low- and high-speed wind profiles. The main control objective in the low-speed wind mode is to maximize the total captured power in a...
This paper is concerned with computer control systems. In particular, we consider stability of quasi-periodic linear impulsive systems which can be used to model sampled-data systems and networked control systems. In this paper, we introduce a class of sets complex zonotopes and use them to verify global exponential stability by deriving a sufficient condition for their contraction. Their advantage...
In this paper, we will investigate the finite-time stability and finite-time stabilization of stochastic nonlinear (SNL) systems with Markovian switching. Firstly, some proper criteria on finite-time globally asymptotically stable in probability (FGSP) are provided. Then, by adding a power integrator technique, a state-feedback finite-time controller is explicitly constructed. It is proven that, the...
We consider the optimal stochastic control problem for home energy systems with solar and energy storage devices when the demand is realized from the grid. The demand is subject to Brownian motions with both drift and variance parameters modulated by a continuous-time Markov chain that represents the regime of electricity price. We model the systems as pure stochastic differential equation models,...
This article presents a case study and comparison of simulations carried out by SimPy 3.0 of Python module and OMNeT++ tool to explore the performance. The target of this comparison is in particular configuration of network for future steps what tools would be good to use. Two simple models of a network were created with Python and C++ language.
This paper introduces event-based control as a means to improve the behaviour of feedback loops with switching controllers. It investigates hybrid event-based control systems where the event-based part of the controller affects a continuous control loop. Its task is to adjust the operating point of this control loop to changing operation modes of the overall system. The paper introduces a control...
Novel input-parallel output-parallel (IPOP) DC-DC converter with maximum power point tracking (MPPT) technique is presented in this paper, which consists of two cascaded stages including buck-boost and isolated boost, so as to achieve high voltage gain and galvanic isolation at proper duty ratio and low leakage energy. Using proposed DC-DC converter, multiple distributed generators (DGs) can be connected...
The stochastic nature of wind speed, time-varying of system parameters, system lagging and nonlinearities can lead to instability of the power generated by wind turbines. In order to improve the dynamic performance in the operation region of constant power output, multivariable control strategy using a sliding mode control technique is proposed based on analysis of the pitch-controlled system research...
The differential boost inverter (DBI) generates an alternating differential voltage from two dc-dc converters. The instantaneous output voltage can be higher or lower than the dc input voltage, however DBIs exhibit nonlinear control-to-output behavior in large-signal sense. Furthermore, switched capacitor cells may operate as a gain multiplier in classical converters. The integration of switched capacitors...
A multi-mode charge pump based stimulator for cardiac pacemaking is presented. This system operates both as voltage-mode and charge-mode stimulator and can deliver voltage stimulus to the tissue with an arbitrary waveform. The core of the stimulator is a reconflgurable 3-stage charge pump circuit with variable switching frequency allowing to adjust the stimulus level to the desired value in a wide...
In this paper, a novel consensus-based distributed nonlinear hierarchical control approach is proposed for frequency and voltage regulation of an islanded AC microgrid under switching communication network. It is proved that the proposed control approach is robust against unreliable communication links as long as the switching graph associated with the communication network satisfies the jointly connected...
This paper presents some practical methods for sizing and controlling a three-phase grid-tied current-source inverter dedicated to photovoltaic applications. Switches control pattern and power losses calculation, reactive elements sizing and control loops of this specific application inverters are described.
In this article the design of an actual and delivered diesel electric system with DC distribution is described. The focus is on the protection philosophy in such a DC distribution system, and how it distinguishes from that in conventional offshore and marine AC distribution systems. The philosophy is based on discrimination. By discrimination it is implied that only the failure affected part is interrupted...
Hybrid energy systems have the potential to bring modern energy services to the 17% of the global population with no access to electricity. The use of diesel generators to provide power for such applications has been the standard for several decades, but due to decreasing prices of photovoltaics, hybrid systems are becoming more common. As a special challenge expanding existing diesel generators with...
In this paper we show how to build an economically optimal feedback control strategy for the re-dispatch of electricity generation. We assume that the operator steers production in a set of controllable power plants by altering the active power set-point of each generator, within a set of predefined set-points. The operators strategy will be based on balancing the operating cost against the expected...
Eagle Harbor Technologies, Inc. has developed an Arbitrary Pulse Generator (APG) with isolated high voltage output. The EHT APG can produce output pulses with voltages up to 10 kV and fast rise time (100 ns) at high pulse repetition frequency (up to 100 kHz) with a user-adjustable duty cycle from 0–100%. The isolated output allows the pulse generator to be connected to loads that need to be biased...
This paper deals with the modeling and control of a Wind Energy Conversion System (WECS) based on a Permanent Magnet Synchronous Generator (PMSG). The WECS operate at variable speed and the control algorithm is based on Direct Power Control (DPC) with an AC/DC conversion system with a PI controller for the DC bus output. The laboratory test system is developed with an emulator of a wind turbine and...
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