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The aim of this paper is to design a fuzzy-sliding mode controller for a four-quadrant PWM converter used in grid-connected wind generation simulator. The main goal is to improve the power factor and realize unity power factor rectifying and inverting. This paper generates the mathematical model of four-quadrant PWM converter and proposes the procedure of designing a fuzzy-sliding mode controller...
Battery-supercapacitor hybrid energy storage systems are becoming popular in the renewable energy sector due to their improved power and energy performances. These hybrid systems require separate dc-dc converters, or at least one dc-dc converter for the supercapacitor bank, to connect them to the dc-link of the grid interfacing inverter. These additional dc-dc converters increase power losses, complexity...
This paper proposes the Fuzzy Direct Power Control (F-DPC), a new control approach applied to three phase PWM converters. The F-DPC controller regulates the DC-link voltage, active and reactive power-flows of the grid-connected converter. The principle of this control is based in fuzzy controller. The steady state and dynamic behavior of DPC and F-DPC are presented that illustrate the operation and...
The paper presents a nine-level selective harmonic elimination pulse width modulation (SHE-PWM) cascaded voltage source converter based STATCOM system. The structure allows direct connection to the grid without the need of any step-up transformers. The converter is controlled with the SHE-PWM technique which provides an elimination to lower order harmonics to improve output waveforms and furthermore,...
It is well-known that single-phase ac-dc conversion requires a bulky dc-link capacitor for filtering the ripple power from the grid. Also, in order to interface a dc renewable energy system to a single-phase utility grid, bi-directional power flow control and dc-bus voltage regulation are major concerns. By using an H-bridge in series with a bi-directional SR dc-dc converter, this paper proposes a...
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...
Under unbalanced grid conditions low order harmonic appears both at the DC output and AC inputs of the converter. Such harmonics lead to deterioration of performance of the system. This paper presents a novel feedback-based controller, which regulates directly converter voltages to eliminate of the 2nd ripple of DC link voltage to alleviate the stress of DC-link capacitor and to reduce the 3rd harmonic...
This paper presents the design and construction of a scaled-down arbitrary waveform power source which bases the synthesis of power signals at its output in two H converters multilevel with asymmetric sources in cascade. The aim of the power source is to mimic the disturbance-like signal for testing controls, instruments and electric devices and equipment in real-time. The electrical disturbances...
Accurate and fast detection for phase angle of the generated voltage is important in parallel grid- connected wind energy conversion systems (WECSs) utilizing converter-inverter unites. Software Phase Locked Loop (SPLL) technique is presented here for precisely detecting the phase angle during presence of the 5th and 7th harmonics. A second-order loop filter design is proposed here as a good trade-off...
With the increasing of wind penetration in power systems, many national grid codes demand complete models and simulation studies under different system conditions in order to ensure that the connection of a wind farm would not have a detrimental impact on the grid. It is now recognized that doubly fed induction generators (DFIG) are used in many large farms. A systematic control methodology for connection...
The paper presents a single-phase grid-connected generation plant consisting of a prime mover driving a three-phase squirrel cage Induction Generator (IG) and a back-to-back voltage source PulseWidth Modulation (PWM) power converter. The prime mover is a commercial Internal Combustion Engine (ICE) whose speed is controlled through a Controller Area Network (CAN) bus protocol. The IG control uses a...
This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this paper proposes an improved MPPT control methods, which can achieves more quickly and effectively tracking the maximum power. Finally, the effectiveness...
A novel control scheme of the grid-connected voltage source converter (VSC) under harmonically distorted grid voltage conditions is proposed in the paper. A dynamic mathematical model of a PWM converter based on the grid voltage-oriented fundamental frequency synchronous coordinate frame under harmonically distorted grid voltage condition is derived. According to the instantaneous active and reactive...
This paper presents a one stage circuit topology for a double buck chopper type single phase PFC converter with active power filtering function in a utility AC grid side and DC output power quality, which can realize much smaller in reactor size and lighter in its weight, along with two unique channel control schemes. The main advantageous point of the newly-proposed PFC converter includes that the...
This paper presents a discrete-time adaptive current controller for grid-connected voltage source PWM converters with LCL-filter. The main attribute of the proposed current controller is that, in steady state, the damping of the LCL resonance does not depend on the grid characteristic since the adaptive feedback gains ensure a predefined behavior for the closed-loop current control. Simulation and...
This paper proposed a modified predictive direct power control (P-DPC) strategy for a grid-connected voltage-sourced converter under unbalanced grid voltage conditions. The proposed P-DPC strategy is implemented in the stationary reference frame without the necessity of either the space vector modulation or the synchronous speed d-q transformation. A compensation method is adopted in the conventional...
In directly-driven permanent magnet synchronous generator (PMSG) system, a fast, robust and precise phase angle detector is most important to calculate feedback variables for control the power factor and the flow of active,reactive power. Because the grid side converter of directly-driven PMSG system is connected to the power network directly, the angle information can be easily corrupted by the distorted...
This paper presents an analysis and the design of an off grid PV system for providing electricity for remote area. The system composed of dc-dc multilevel boost converter (MLBC) which is used for extracting maximum power from the cell. It has been chosen to generate three dc voltages at its output terminal. In addition to, a multilevel dc link inverter suitable for the generated dc bus voltages. The...
The integration of distributed energy resources (DES) with the distribution network offers a number of technical, environmental, and economical benefits. This paper demonstrates the functions of a series grid interconnection module that integrates distributed generations (DG) and energy storage (ES) for peak load shaving and power quality enhancement. The proposed module uses a voltage source converter...
A back-to-back PWM converter is used as the excitation power supply for the doubly-fed induction generator (DFIG) wind power generation of variable speed constant frequency (VSCF). The mathematical model and control strategy of converter which is connected between rotor and grid is analyzed. Grid-side converter adopts grid voltage oriented control scheme for achieving the stability of DC-link voltage,...
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