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This paper presents the design and implementation of a power supply unit for zone-less induction cook-top. Here a control algorithm is also presented for tracking the user activity which includes misalignment of pan above the coil and removal of pan. The control algorithm is implemented using a DSP processor. The power supply consists of a power stage, control stage, and digital control algorithm...
In this paper, the design of a proportional resonant (PR) controller for the packed U cell (PUC) 5 level inverter is presented. The objective of the presented work is to present a better solution for current control in grid connected application of the investigated topology. A suitable LCL filter is designed along with the PR control scheme for grid connection. Simulation is performed in MATLAB®/Simulink...
This paper investigates cyber-attacks compromising the data integrity of inverter-based islanded microgrids featuring an energy storage system (ESS), a wind turbine generator (WTG), a photovoltaic system (PV) and controllable loads. The ESS operates as the isochronous generator, responsible for forming the microgrid voltage and frequency, whereas the WTG and PV distributed energy resources (DER) operate...
This paper presents a diagnostic study on the regular sampled Space Vector PWM (SVPWM) for sub-harmonics, when operated with fractional carrier ratios in variable frequency applications. Also a modified approach is proposed for refinement of the harmonic profile of SVPWM with a low computational dynamic sampling and carrier generation. When inverters are operated at fractional fundamental frequencies...
An advanced Solar Photovoltaic plant controllers designed to improve system performance, reduce the need for ancillary services, and provide ancillary services instead of or in competition with conventional resources. This paper presents control model of three phase grid connected photovoltaic generation system with new approach for reactive power regulation. In order to maximize the power output,...
VSG (Virtual Synchronous Generator) is a control method for inverters that mimics both the steady-state droop characteristic and transient characteristic of Synchronous Generators (SGs). Because the steady states of VSG and droop controlled inverters are similar, the deviation of frequency and voltage amplitude also exists in the VSG. This paper proposes a new secondary control method mimicking the...
This paper introduces an application of wind energy conversion system (WECs) with matrix converter. Due to the enormous advantage of WECs make it suitable source of energy. When the wind speed changes the generated voltage rms value and frequency will be changes and this will effect on the performance of the load so matrix converter is used to control the voltage and frequency of the load. A self-excited...
Microgrids (MGs) are one of the most feasible structures that accommodate the increased penetration of the intermittent renewable distributed energy sources. Enabling MGs with renewable energy sources is crucial to meet the environmental concerns, and get economic benefits and reliability requirements. This paper details the effect of control strategies of an inverter-based distributed generation...
Power flow control is one of the major issues in parallel connected inverters of an isolated microgrid. Droop control is considered to be the well-known method for managing power flows between micro-grid converters in decentralized manner. In this work, the fuzzy logic based improved droop control technique is developed to control the power flow between voltage source inverters connected in wind and...
The paper proposes a method to regulate the output frequency and duty cycle (phase) of ring oscillator by emulating a resistive voltage divider using purely digital means. To this end an additional master oscillator that can be clocked by an external frequency is connected in series with a slave one. The behavioral model of this system is a stack of voltage-controlled oscillators, since the inherent...
Compared with typical current controlled PV inverters, voltage controlled PV inverters based on droop control are easier to achieve seamless transfer between the stand-alone mode and the grid-connected mode. This paper achieves both seamless transfer and the maximum power point (MPP) tracking (MPPT) by adjusting droop curves dynamically, combining MPPT and P-f droop control. The DC voltage is difficult...
Equal rating inverters operating with different power set points may experience circulating power during unpredictable cases such as faults on a heavy load site due to a large mismatch between load consumption and power generation. This momentarily circulating power increases the dc-link voltage of the inverter and exceeds the voltage limit, leading to inverter shutdown for safety purposes. To overcome...
This paper proposes a synchronization control strategy based on voltage-controlled inverter and the synchronous speed is controllable. The proposed inverter can be simplified as a circuit consists of a controlled voltage source and equivalent impedance, the output voltage amplitude and frequency can be changed by adjusting the axial-regulators. The designed synchronization method has detection module...
This paper presents a suitable output voltage control approach for parallel distributed generation (DG) units working in standalone operating mode. Indeed, an Adaptive Multi Resonant controller with weighted State Feedbacks is optimally designed for the voltage control loop while a Proportional regulator is proposed for the inner current loop. Thankful to its frequency adjusting ability, the proposed...
This paper proposes a control scheme for single phase inverter based systems. The inverter controller consists of two loops; the inner current control loop which is the faster one while the outer voltage / active and reactive power control loop is the slower one. A Lyapunov based inner (current) control is presented in this work which robustly tracks the reference current independent of the system...
Design and implementation of constant frequency sliding mode current control for three phase grid connected Nine Level Multilevel Inverter is presented for distributed generation systems and power quality applications. Limitations in present design of sliding mode controller for grid connected systems are discussed and method to overcome these limitations is proposed. Proposed constant frequency sliding...
This paper attempts to present the devising of the Matrix converter and an AC-DC-AC converter along with their working principle and control mechanisms. Both of these converters are AC-AC converters and are primarily used in cases where frequency of the out-put AC signal needs to be regulated with respect to the input. The principle of superposition is used by the matrix converter and is deployed...
Owing to generation and demand mismatch in a micro-grid, the frequency deviation and the rate of change of frequency (ROCOF) may become drastic at times. This is due to increased penetration of renewable energy sources that brings down the system inertia. Therefore, efficient control algorithms are required to mimic the inertial behavior of a conventional synchronous machine to arrest/limit the sudden...
This paper proposes strategies for regulating the grid current of a three-phase inverter connected to an electrical network through a LCL filter interfaced by a PV system. The focus of the analysis is to investigate the use of a PI controller or PR controller to regulate the grid current in the outer loop, when there is inner capacitor current regulating loop already provided in order to stabilise...
This paper presents the design of new controller and modeling for a single phase inverter that must operate in island mode or disconnected from the grid within a microgrid. The inverter model is presented in small signal and the current loop controller and the comparative between two controllers for the voltage loop are designed. Considering that in this mode of operation the aim is to maintain the...
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