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The objective of this work is to analyze the dynamic behavior of a generator which uses a grid-connected inverter with an output LC filter. In this paper, we focus on modeling and simulating this kind of inverter using real time simulation. A control strategy based on resonant controller is proposed. State feedback structure and pole assignment methods are used to design the controller. To test this...
A combination of optimization practices both for continuous and discrete parameters optimization is carried out, based on particle swarm optimization, and is applied to power circuit design. The system under optimization is an active rectifier, operated by means of a resonant controller and utilized to set sinusoidal input waveforms in system grid.
Several switching strategies have been developed to overcome the unbalanced working period and power sharing in cascaded multilevel inverters, but the power sharing problem is remained unsolved yet. In this paper, a novel switching method which equalizes the modules' power sharing is presented.
A coupled feedback and feedforward control strategy of the parallel hybrid power filter (HPF) is presented in the paper. It features a small sensitivity against a disturbed supply voltage system and enables us to set grid phase currents in the phase with respective voltages. The experimental data agree with theoretical expectations.
This paper presents a few examples of the possibility of effective use of open-source simulation tools within the project gsim to solve the problems of the electronics in educational and professional practice. The fundamental difference with regard to commercial products are open file and data formats, the possibility of creating own components and macro models. An essential advantage is the easy...
The utilization of voltage source inverter (VSI) connected to the grid in photovoltaic systems requires application of control systems capable of regulating the active and reactive output current, ensuring high power quality levels and achieving relative immunity to grid perturbations. In the single phase system the LCL filter is adopted, which can reduce the required filtered inductance and the cost...
Different current source converter topologies for permanent magnet synchronous generator (PMSG) wind turbine applications are presented and analyzed in the paper. In high-power and medium-voltage range, current source converter has its natural advantages, such as simple topology, compact size, high power capability, excellent short circuit protection, and flexible power flow control. However, it also...
In the paper a control system of AC-DC-AC converter used as a grid interface for renewable energy sources is presented. The generic Direct Power and Torque Control with Space Vector Modulation (DPTC-SVM) scheme has been expanded by two modules: grid voltage dips compensation and higher harmonics compensation. Some simulation and experimental results, illustrating properties of the considered system...
Advantages of operating a Permanent Magnet Synchronous Machine (PMSM) without a position sensor are many and are well known. This paper presents a study of the effects of space harmonics in the incremental inductances and their impact on the machine saliency. The effects of space harmonics exclusively due to the machine (i.e., the saturation saliency distribution) are given particular consideration...
This paper presents a comprehensive review of power quality challenges under high penetration rate, fluctuation and imprecise prediction of incoming energy provided from different types of renewable sources. Power electronics devices such as active and hybrid filters topologies as well as different harmonic extraction techniques, and advanced type of controllers are classified, evaluated and discussed...
The performance of the Grid Connected Inverters (GCIs) (like windmill and large central PV converters) is extremely important related to stable and safety operation of a "Smart Grid" SG. These inverters' control features not only cover the renewable energy conversion and active power feeding into the utility grid but furthermore they cover the helping of the grid voltage stabilization, supporting...
In this paper, the control of Voltage source converter which consists of six IGBT power switches is realized. Grid connection of VSC is provided through LCL filter and sinusoidal pulse width modulation (SPWM) technique which has 9 kHz switching frequency, is used for switching. Three different way of control including a - b - c, d - q and input - output linearization nonlinear control, are analyzed...
Owing to the increasing number and power rating of static power converter (SPC) based systems the need arises for distributed power generation systems to take part in the control-related issues of power generation. The requirements for large and small power generation systems differ from the aspect of utility interaction. Measures to avoid and compensate the appearance of, and to reduce the possibility...
This paper presents an approach for the initial rotor position detection in permanent magnet synchronous machine (PMSM) drives. It is based on injection of low frequency current and excitation of small rotor speed oscillations. In this way information about spatial position of the rotor flux can be retrieved from the stator voltage response regardless of the rotor (average) speed. The method presented...
An analysis and improvement of the direct power control method (DPC) for converter feeding generators in wind power applications under disturbed grid voltages is presented. An improved DPC method is derived and described, and its performance is analyzed as well. This improved DPC permits a robust and dynamic control of active and reactive power even under symmetrical and unsymmetrical voltage sags,...
This paper proposes new control strategy for grid connected three-phase Voltage Source Converter (VSC). The strategy is designed to overcome problems of conventional voltage oriented VSC control operating under distorted grid voltage. Proposed control strategy cancels the influence of characteristic distribution grid voltage harmonics, and injects close to sinusoidal current to the grid, with permitted...
The objective of this article is to compare two concurrent VSC-based topologies suitable to interconnect two MV distribution grids. These power-electronics-based devices must not only control the power flow between both grids, but also compensate for power quality phenomena. For this reason, size comparison is made separately according to the function that they develop. The first part of the paper...
This paper describes design of protection and load-priority control devices for distributed generation. Possibilities of recent energy-metering integrated circuits are utilized in system diagnostics and protection. The experimental prototype is based on sensor modules and metering IC. Modules could be integrated with converters and distribution centres for voltage quality monitoring and equipment...
This paper analyses the influence of the modulation technique on the size of the grid EMI filter inductor in a full bridge converter for photovoltaic systems. Additionally, the use of an alternative modulation technique is proposed which exhibits the best compromise concerning efficiency, current quality and EMI filter size.
This paper deals a new strategy for wind-diesel hybrid system energy improvement using Ultracapacitors (UC) and Battery. Energy management strategies are focused on the frequencies distribution of the wind generator current between UC and Battery. The developed control laws are based on the knowledge of the dynamic behavior of each source, in aim to prevent the diesel generator against the fluctuating...
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