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The role of inertia emulation and voltage control is fundamental to support the integration of distributed generation in weak power grids and Virtual Synchronous Machines (VSMs) represent an attractive solution to assume both of these roles. However, VSMs act as voltage sources and this makes it difficult to address power quality issues. Virtual impedances are commonly applied in the literature to...
Harmonic resonance issues have been attracted more and more attention due to a large number of power electronic inverters being used in power systems. In this paper, in order to have a deep insight into resonances, the singular value sensitivities with respect to component parameters of the network and the control parameters of inverters are used for harmonic resonance analysis based on Singular Value...
For complying with power distributor regulation, the electric car chargers have to address the line current harmonic mitigation problem. The conventional solution is a proportional integral controller on the rectified current with a feed-forward anticipation action on the input network current. In this work we take advantage of a harmonic description of the electric car charger in order to propose...
The aim of this paper is the conversion of the classical hysteresis controller into a constant frequency hysteresis current controller. The classical alternative to the hysteresis controller is the proportional-integrative controller which gives constant switching frequency and overall better performances with a cost of comprehensive parameter tuning and sensitivity at driven system change. The hysteresis...
Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve...
Due to the nonstationary characteristic of the electric locomotives in electric traction systems, the equivalent grid impedance changes frequently, which may lead to detrimental effect on the control system of electric traction PWM rectifiers. The mathematical model of an electric traction PWM rectifier is established, and the double-loop control system is designed. An online grid inductance estimation...
In recent years, the world has witnessed a rapid development in the electronic device industry and modern energy systems. Power quality (PQ) is one of the most important topics that have preoccupied the thinking of engineers working in the field of electric power. There are many disturbances that affect electrical power quality (PQ), including harmonics, sag, swell, transience, interruptions, waveform...
This work presents a control strategy for grid-connected voltage source inverters in Distributed Power Generation. The proposal combines two control loops, an internal loop based on the Robust Predictive Current Control (RPCC) and an external proportional-resonant with harmonic compensators (PR+HC) to achieve high rejection to external perturbations and improve grid current THD in steady state. The...
The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface...
In view of multifarious power quality problems in the electrical railway power system (ERPS), an asymmetrical connection balance transformer (ABT)-based power quality control system (ABT-PQCS) is presented in this paper. The back-to-back converter which is connected to the system through the step-down transformer can eliminate the negative sequence current (NSC), compensate reactive power at the same...
With the development of computer control technology and power electronics, six-phase induction motor control system has been widely used in industrial area due to its advantages. Through the study of single-phase induction motor SVPWM control technology, combined with the six-phase induction motor winding structure, a novel six-phase induction motor SVPWM control strategy is proposed and the third...
The boost inverter can be an alternative grid interfacing power converter for renewable energy sources since it can generate an AC voltage whose peak value could be greater than the DC voltage. When it connects to the grid, high quality output current is required, therefore, grid current is hoped to be controlled directly. A novel control strategy to control grid current with only one closed control...
This article is devoted to the development and investigation of sine wave RC oscillator with twin T-bridge (TT-bridge) band-stop filter in the negative feedback circuit and automatic amplitude control system. We investigated the automatic amplitude control system, its effect on the noise characteristics of the RC-oscillator, as well as RC-oscillator with automatic amplitude control system stability...
This paper presents the design of a current control system for a single-phase grid-tied inverter equipped with a LCL grid-side filter, which is suitable for inverter DC current component suppression. For that purpose, a proportional-resonant (PR) controller of principal harmonic current component has been designed. This is followed by the design of DC current component estimator based on second-order...
This paper presents an integration of a battery support to a single phase grid with a solar PV system. The unique control of multi-functional voltage source converter achieves controlled charging and discharging of the battery. The implemented converter achieves the extraction of maximum power from varying solar PV array further maintaining the battery current control within acceptable limits. The...
Due to the low inductance of an LCL-filter, the grid current generated by an LCL-filtered Voltage Source Inverter (VSI) is sensitive to low-order grid-voltage harmonics. This issue is especially tough for the control system with Inverter Current Feedback (ICF), because the grid-current harmonics can freely flow into the filter capacitor without control. To cope with this issue, this paper develops...
The present article deals with power quality increasing and electromagnetic compatibility ensuring the problem existing in power supply systems of industrial enterprises with intensive spread of nonlinear load which is mostly demonstrated by power converters of variable speed drive systems. The use of the proposed hybrid harmonic correction system adapted for the variable speed drive system as a kind...
The paper identifies prospective areas for electric drive control systems development and possibilities for their qualitative improvement. Application of the spectral method to the synthesis of electric drive control systems is under consideration. The wavelet spectrum processing capability estimation under the conditions of digital implementation of the controller and automatic control systems in...
Trend of increasing the share of electricity production from the renewable energy sources will surely continue the in the upcoming time period. This paper outlines multiple solutions of accumulation of energy, especially electricity, in the Technology Center of Ostrava (TCO). It presents solutions for storage of electrical energy into the batteries with use of power converters with an additional function...
In this paper is presented the design of PR controller for 3-phase current source inverter. The converter is implemented with IGBT transistors and is modelled as a CSI (Current Source Inverter). Current control loops based on resonant techniques and instantaneous power p-q theory are used to control the DC/AC converter. This control strategy achieves active and reactive power generation in a three-phase...
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