This paper presents a dual voltage source inverter (DVSI) scheme to enhance the power quality and reliability of the microgrid system. The proposed scheme is comprised of two inverters, which enables the microgrid to exchange power generated by the distributed energy resources (DERs) and also to compensate the local unbalanced and nonlinear load. The control algorithms are developed based on instantaneous symmetrical component theory (ISCT) to operate DVSI in grid sharing and grid injecting modes. The proposed scheme has increased reliability, lower bandwidth requirement of the main inverter, lower cost due to reduction in filter size, and better utilization of microgrid power while using reduced dc-link voltage rating for the main inverter. These features make the DVSI scheme a promising option for microgrid supplying sensitive loads. The topology and control algorithm are validated through extensive simulation and experimental results. © 2010-2012 IEEE.

Mahesh Kumar Mishra

Department of Electrical Engineering

Algorithms

Electric network analysis

Electric power distribution

Energy resources

Power quality

Bandwidth requirement

Distributed energy resources

Extensive simulations

Grid connected inverters

INSTANTANEOUS SYMMETRICAL COMPONENT THEORY

Micro grid

Power quality improvement

Voltage source inverter

Electric inverters

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

A Grid-Connected Dual Voltage Source Inverter With Power Quality Improvement Features

IEEE Transactions on Sustainable Energy

This paper proposes an adaptive power management strategy with reduced sensor requirement for grid connected hybrid microgrid system under faulty conditions which occur in grid tied converters. Generally parallel combination of grid tied converters (GTCs) are used as an interface between microgrid and grid, which are responsible for power transfer among renewable energy sources (RES), hybrid energy storage system (HESS), grid and loads. Hence they are very essential parts of microgrid systems but easily prone to faults due to semiconductor switch failures. This in turn effects the operation and reliability of microgrid. To overcome these drawbacks a new power management algorithm is proposed which takes into account converter faults, renewable power availability and state of charge limits of HESS to effectively manage power between different sources and sinks. In this work instantaneous symmetrical component theory (ISCT) is used for power sharing and limiting among grid tied converters, without measuring GTCs powers using control parameters. Apart from ensuring stable microgrid operation, power quality aspects such as harmonic mitigation, reactive power support and unity power factor are achieved. The effectiveness of the proposed system and algorithm is tested and validated using MATLAB based simulink environment. © 2017 IEEE.

Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

ISCT based adaptive power management strategy for grid connected hybrid microgrid during GTC faults with reduced sensor requirement

This paper proposes an islanded hybrid microgrid system with dual voltage source inverter (DVSI) using instantaneous symmetrical component theory (ISCT) for reference current generation and power management. In this work a reduced DC link voltage has been achieved and efficient, simple power management algorithm (PMA) which takes account of load shedding and off-MPPT operation is proposed under islanded mode. A three-phase dual voltage source inverter (DVSI) consists of main and auxiliary inverters. The main inverter transfers the active power between AC loads and microgrid based on renewable power availability and state of charge (SOC) limits of hybrid energy storage system (HESS). Auxiliary inverter offers ancillary services such as harmonic mitigation and reactive power support resulting in balanced sinusoidal voltages at the point of common coupling (PCC) though there is line impedance. The proposed system is tested and validated using MATLAB based simulink environment. © 2016 IEEE.

IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2016

Power management of islanded hybrid microgrid with dual voltage source inverter considering the impact of line impedance

This paper proposes a grid connected hybrid microgrid system with dual voltage source inverter (DVSI) using modified instantaneous symmetrical component theory (MICST) for power sharing among inverters. In this paper a reduced DC link voltage has been achieved, efficient, simple power management algorithm (PMA) is proposed and new method is introduced for DVSI control parameter extraction which reduces control complexity and overall system cost. The Proposed topology consists of a three phase dual voltage source inverter (DVSI) which transfers the active power between grid and microgrid based on renewable power availability and state of charge (SOC) limits of hybrid energy storage system (HESS). Besides, offering ancillary services such as harmonic mitigation, reactive power support and unity power factor at the point of common coupling (PCC). The proposed system is tested and validated using MATLAB based Simulink environment. © 2016 IEEE.

2016 IEEE International Conference on Renewable Energy Research and Applications, ICRERA 2016

Power management of grid connected hybrid microgrid with dual voltage source inverter

This paper proposes a control scheme to control the microgrid side voltage-source converter (\mu G-VSC) using instantaneous symmetrical components theory. The \mu G-VSC with proposed control can be utilized 1) as a bidirectional power sharing converter to control the power flow from the dc side to the ac side and vice versa, based on renewable power available at the dc link; 2) as a power quality compensator with the features of reactive power compensation, load balancing, and mitigation of current harmonics generated by nonlinear loads at the point of common coupling, thus enabling the grid to supply only sinusoidal current at unity power factor; and 3) to damp out the oscillations in the \mu G-VSC currents effectively using damping filter in the control algorithm. The mathematical models are derived and stability aspects are analyzed in detail through the frequency domain approach. The multifunctional features of the proposed control algorithm are demonstrated using extensive simulation studies and are also validated through experimental results. © 2013 IEEE.

Multifunctional vsc controlled microgrid using instantaneous symmetrical components theory

In this paper, the theory of instantaneous symmetrical components is applied to explore various control strategies of load compensation, under different supply voltages. When the supply voltages are balanced and sinusoidal, all of these strategies converge to the same compensation characteristics. However, when the supply voltages are not balanced sinusoids, these control strategies result in different degrees of compensation in harmonics, power factor, neutral current, and compensator ratings. These control strategies are discussed in detail and a comparative study of their performance in terms of the rms value, total harmonic distortion, power factor of source currents, and compensator ratings is presented. Based on this study, it is possible to select the best strategy to meet the required load compensation characteristics for available supply voltages. A three-phase four-wire distribution system supplying an unbalanced and nonlinear load is considered for simulation study. The detailed simulation results using MATLAB are presented to support the proposed compensation strategies. © 2008 IEEE.

IEEE Transactions on Power Delivery

Control strategies for load compensation using instantaneous symmetrical component theory under different supply voltages

In this paper, a design of the voltage source inverter (VSI) in a hysteresis band current control mode is presented. A proper selection of VSI parameters is necessary to track the desired reference currents at the point of the common coupling to compensate unbalanced and non-linear loads. In this paper, the authors carry out a detailed study on the design parameters and dynamics of the VSI while tracking a reference compensator current. A simulation of three-phase, four-wire compensated system is carried out using PSCAD 4.2.0 to verify the proposed design methods. © 2006 IEEE.

2006 International Conference on Power Electronics, Drives and Energy Systems, PEDES '06

A study on design and dynamics of voltage source inverter in current control mode to compensate unbalanced and non-linear loads

IET Renewable Power Generation

Photovoltaic plant with reduced output current harmonics using generation-side active power conditioner

Robust Energy Management for Microgrids With High-Penetration Renewables

A Grid-Connected Dual Voltage Source Inverter with Power Quality Improvement Features

Journal	Data powered by TypesetIEEE Transactions on Sustainable Energy
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN	19493029
Open Access	No