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This paper presents the role of Distribution Static Synchronous Compensator (DSTATCOM) in the domain of reactive power sharing and harmonics mitigation in distribution systems under distorted grid condition. Extraction of reference current is done using Synchronous Reference Frame (SRF) based strategy which greatly influences the performance of the DSTATCOM. A modified SRF PLL is used for unit vector...
Phase-locked loops (PLLs) are very important in power and energy areas. Many PLLs have been proposed in recent literatures, and all these methods are to design a robust filter and let them be as a preprocessing tool before the synchronous reference frame PLL (SRF-PLL) input. Among these PLLs, a interesting PLL is Least-Error Squares (LES) Filter-Based PLL (LES-PLL), which is composed of a LES filter...
Problems with power quality in the grid have gained a lot of attention recently due to rapid increase in the amount of grid-connected power converters. The converter should produce sinusoidal currents also during abnormal conditions, such as unbalanced grid voltages. Several methods, like the delayed signal cancellation-based method (DSC), have been proposed to alleviate the detrimental effect of...
For the control of electric motors, conventional inverters have utilized position and current sensors, but they undesirable in terms of cost and maintenance effort. For this reason, approaches without the sensors are developed by applying back electromotive force or signal injection-based method which also has some problems related to the the deterioration of control performance in low speed range...
For a grid-connected Voltage-Source Converter (VSC), dynamics of the grid synchronization plays an important role in affecting the converter performances and stability. Due to its significance, this paper gives a comparative analysis about some basic grid synchronization schemes, through viewpoint of dynamic performances, which appeared as the impacts of voltage perturbation on the estimated angle...
To avoid the stability problem of grid connected inverter caused by the conventional phase locked loop (PLL), the direct power control of voltage source inverter in virtual synchronous reference frame without PLL is investigated considering grid voltage disturbance in the paper. Based on the small signal analysis methods, comparison between conventional PLL and no PLL is made. It can be found that...
Phase-locked loops (PLLs) are doubtless the most popular synchronization technique in the power converters. Almost all proposed PLL structures known in literature are inherently nonlinear and can be linearized as second order linear time invariant system. Nonlinear nature of PLLs degrades their performances, and question arises if there exist an enhanced PLL structure that would have superior performances...
In this paper, a new control method of single phase phase-locked loop (PLL) function which can be useful in the electric railway PWM converter system is presented. New PLL system does not use conventional all pass filter (APF) algorithm. Instead, modified moving average filter (mMAF) which has a simple calculation is newly proposed. The feasibility of proposed mMAF method was investigated through...
This, paper proposes a method to eliminate the dc component in the measured three-phase grid voltage as the input signals of phase-locked loop (PLL). The dc component in the input signals of PLL causes a low-frequency oscillation of grid frequency. The dc component elimination can be achieved by replacing the integrator in the second-order generalized integrator (SOGI) with a differentiator, named...
Phase locked loop inverter synchronization method is the mostly used synchronization method for both single phase and three phase systems. Recent research has focused on the improvement of the performance of the phase lock loop inverter synchronization method under different grid conditions. The common phase locked loop synchronization techniques such as the Second Order Generalized Integrator based...
Phase-locked loops (PLLs) are commonly used for the synchronization of grid connected power converters. However, the standard PLL structures are not able to reject grid disturbances such as voltage harmonics, unbalances or DC components in the measured voltage. Since the response of the power converters depends on the grid phase tracking, it is necessary to ensure an accurate synchronization even...
A new implementation of the recently proposed fixed-frequency two-sample (2S) quadrature generation subsystem (QSG) digital Phase Locked Loop PLL, applicable to single-phase Power Factor Correction (PFC), is proposed. Its characteristics are high accuracy and low computational burden. The proposed PLL includes a frequency feedback loop to improve the synchronization under line frequency variations...
The deterioration of power quality is posing an increasing problem for low and medium voltage grids. At the same time, grid codes place ever stricter requirements for the operation of distributed generation systems, especially regarding fault-ride-through capabilities during more severe grid fault events. Therefore, a proper operation of converter-based power systems needs to be guaranteed, requiring...
The growing number of renewable energy sources and power electronic participants are increasingly endangering the quality of supply at distribution grid level. A modular shunt-connected power conditioning system featuring uninterruptible power supply capability is proposed to locally increase power quality and supply reliability. This paper proposes an operation-mode-adaptive cascaded control strategy...
With the problem of existing transfer strategy's dependence on grid phase information, an on/off-grid transfer strategy with real-time phase angle difference adjustment was proposed. By calculating the corresponding phase angle difference with the reference power, the phase angle between the inverter output voltage and filter capacitor voltage was adjusted within rather a short time gap, so that the...
For compact integration of 13.56MHz NFC functionality in mobile devices, a small planar loop antenna is a necessity. Active load modulation (ALM) is a commonly adopted technique to boost load modulation amplitude to overcome weak inductive coupling in small antennas. However, due to the challenges of phase synchronization, ALM is mainly limited to low data rate NFC applications. This paper describes...
This paper introduces a MATLAB simulation of 3 phase grid tied inverter which synchronizes with grid as per grid requirement. The aim of this simulation is an implementation of the designed filter to effectively reduce the ripple component injected into the grid to an acceptable value. The focus is on designing inverter which will synchronize with grid. The design and analysis of the grid synchronization...
Grid synchronization algorithms are of great importance in the control of grid-connected power converters, as fast and accurate detection of the grid voltage parameters is crucial in order to implement stable control strategies under generic grid conditions. This paper presents a new grid synchronization method for three-phase three-wire networks, namely dual second-order generalized integrator (SOGI)...
A photovoltaic (PV) source is reliable and emission free. The benefits of the micro-grid include high reliability. Therefore, a micro-grid connected PV system is a feasible source for electricity. However, nowadays the efficiency of a PV array is remains low. In the proposed MPPT algorithm, it was very simple under changing light intensity by only regulating the photovoltaic voltage. The control method...
The integration of Solar Photovoltaic (SPV) power generation system with the grid by using Enhanced Phase Locked Loop (EPLL) scheme based indirect control. The developed control scheme for synchronizing the SPV system with utility grid improves the power factor of the source and voltage profile at the point of common coupling (PCC). The proposed controller maintain the voltage profile at PCC through...
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