Power management of grid connected hybrid microgrid with dual voltage source inverter
01 Nov 2016-pp 407-412
TL;DR: In this paper, a grid connected hybrid microgrid system with dual voltage source inverter (DVSI) using modified instantaneous symmetrical component theory (MICST) for power sharing among inverters.
Abstract: 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.
Citations
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Journal Article•
TL;DR: In this article, a dual voltage source inverter (DVSI) scheme is proposed to enhance the power quality and reliability of the microgrid system, which enables the micro-grid to exchange power generated by the distributed energy resources (DERs) and also compensate the local unbalanced and nonlinear load.
Abstract: 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 con- trol 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 relia- bility, lower bandwidth requirement of the main inverter, lower cost due to reduction in filter size, and better utilization of micro- grid 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.
42 citations
01 Nov 2017
TL;DR: A robust Second-Order Super-Twisting Sliding Mode Control for a Grid-connected inverter of a PV power plant is proposed to maximize the energy extracted from the PV while regulating the DC-link voltage and achieving a power factor compensation and the reduction of currents harmonic distortion.
Abstract: In this paper, it is proposed a robust Second-Order Super-Twisting Sliding Mode Control for a Grid-connected inverter of a PV power plant. The proposed control strategy is able to maximize the energy extracted from the PV while regulating the DC-link voltage and achieving a power factor compensation and the reduction of currents harmonic distortion. Both in balanced or unbalanced condition, the grid is supplied by the PV plant with the desired active power and with the developed strategy, it is possible to use the inverter as a reactive power compensator. In order to prove the goodness of the proposed algorithm in terms of high efficiency and performance, some simulated and experimental results are carried out.
24 citations
TL;DR: This proposed system successfully tracked the maximum power, which is analysed using the combined development of galactic swarm optimisation (GSO) based incremental conductance (IC) algorithm and the performance of proposed is compared with existing algorithms.
Abstract: DC-DC converter plays a major role in microgrid and energy storage system using operational stability and synchronised power delivery. In this paper, an energy management control algorithm is propo...
12 citations
Cites background from "Power management of grid connected ..."
...The PI controller takes output voltage value and compares with the required system output voltage and provides a trigger signal to a converter (Baghaee et al., 2017; Jiang et al., 2017; Kumaravel & Ashok, 2015; Yallamilli & Mishra, 2016)....
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01 Oct 2017
TL;DR: This paper proposes a power sharing scheme for an Islanded DC microgrid with hybrid energy storage system (HESS) which reduces the losses in the HESS interfacing converters along with State of Charge (SOC) balancing.
Abstract: This paper proposes a power sharing scheme for an Islanded DC microgrid with hybrid energy storage system (HESS). HESS comprises of battery and supercapacitor (SC), where the usage of supercapacitor reduces the current stresses on the battery. This scheme reduces the losses in the HESS interfacing converters along with State of Charge (SOC) balancing. To maintain a constant DC link voltage a DC link voltage controller is employed which is quick and has better regulation compared to droop controlled scheme. An objective function is formed by taking the power loss and SOC into consideration. A centralized controller is employed for sensing the battery's SOC and current demanded by DC link voltage controller. This centralized controller uses Particle Swarm Optimization (PSO) for solving the objective function and generate optimized coefficients which will share the power among the HESS interfacing converters. The proposed scheme is tested and validated using MATLAB based simulink environment.
10 citations
Cites background from "Power management of grid connected ..."
...Whenever there is an unbalance between input and output, the DC link capacitor starts charging or discharging there by increasing or decreasing in DC link voltage respectively [13]....
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Journal Article•
TL;DR: This paper derives the most suitable optimization techniques of HRES in two steps by conducting a comprehensive review of hundreds of the most recent research papers on HERS and runs statistical calculations and data mining analysis on the big data collected in the first step.
Abstract: According to numbers and charts reported recently in the global renewable status and the international energy agency, Renewable energy sources (RES) surpassed the natural gas and occupied the second position as a source of electricity. However, the intermittent nature of RES, causes a big problem of trifold dimensions: System cost, environmental impacts, and system reliability. Studies found that, using diverse RES combined in hybrid renewable energy systems (HRES) can handle these issues efficiently but only when utilizing good optimization techniques. Consequently, this paper derives the most suitable optimization techniques of HRES in two steps. Firstly, it conducts a comprehensive review of hundreds of the most recent research papers on HERS. Secondly , it runs statistical calculations and data mining analysis on the big data collected in the first step. The outcomes of these calculations and analyses are represented in form of statistical results and frequent patterns rulesets. Results proved that the statistical results go a long with the rulesets and they give typical results. Thereby, they validated each other and verified the correctness of the overall results. As a result, the paper produces two great databases. The first one can be considered as a guide for researchers to determine the best techniques for optimizing HERS systems. The second database of statistical results and frequent pattern rulesets can help researchers immensely in predicting the most suitable optimization techniques and algorithms for designing and developing HERS systems.Â
8 citations
References
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TL;DR: This paper presents a review of ESSs for transport and grid applications, covering several aspects as the storage technology, the main applications, and the power converters used to operate some of the energy storage technologies.
Abstract: Energy storage systems (ESSs) are enabling technologies for well-established and new applications such as power peak shaving, electric vehicles, integration of renewable energies, etc. This paper presents a review of ESSs for transport and grid applications, covering several aspects as the storage technology, the main applications, and the power converters used to operate some of the energy storage technologies. Special attention is given to the different applications, providing a deep description of the system and addressing the most suitable storage technology. The main objective of this paper is to introduce the subject and to give an updated reference to nonspecialist, academic, and engineers in the field of power electronics.
1,115 citations
"Power management of grid connected ..." refers methods in this paper
...But, they have a problem of poor power density, hence an additional energy storage device having high power density such as supercapacitor is used and such a combination is called as hybrid energy storage system....
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TL;DR: This paper presents an overview of power management strategies for a hybrid ac/dc microgrid system, which includes different system structures, different operation modes, a thorough study of various power management and control schemes in both steady state and transient conditions, and examples of powermanagement and control strategies.
Abstract: Today, conventional power systems are evolving to modern smart grids, where interconnected microgrids may dominate the distribution system with high penetration of renewable energy and energy storage systems. The hybrid ac/dc systems with dc and ac sources/loads are considered to be the most possible future distribution or even transmission structures. For such hybrid ac/dc microgrids, power management strategies are one of the most critical operation aspects. This paper presents an overview of power management strategies for a hybrid ac/dc microgrid system, which includes different system structures (ac-coupled, dc-coupled, and ac–dc-coupled hybrid microgrids), different operation modes, a thorough study of various power management and control schemes in both steady state and transient conditions, and examples of power management and control strategies. Finally, discussion and recommendations of power management strategies for the further research are presented.
707 citations
"Power management of grid connected ..." refers background in this paper
...…can come up with the use of AC or DC voltages in the local grid thus hybrid AC/DC microgrids are often implemented and have the advantages of both AC/DC power systems, so they are considered as a bridge to future energy distributed systems. called as Hybrid AC/DC Microgrids [2], which are…...
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TL;DR: In this paper, a new approach for generating reference currents for an active filter and/or a static compensator is presented, where the compensators are connected to a load that may either be connected in star or in delta.
Abstract: This paper presents a new approach for generating reference currents for an active filter and/or a static compensator. It is assumed that the compensator is connected to a load that may either be connected in star or in delta. The load can be unbalanced and may also draw harmonic currents. The purpose of the compensating scheme is to balance the load, as well as make the supply side power factor a desired value. The authors use the theory of instantaneous symmetrical components to obtain an algorithm to compute three phase reference currents which, when injected to the power system, produce desired results. They also propose a suitable compensator structure that will track the reference currents in a hysteresis band control scheme. Finally, the feasibility of such a scheme is demonstrated through simulation studies.
322 citations
"Power management of grid connected ..." refers background in this paper
...Here α1, α2 represents the fraction of load currents compensated by inverter-1, inverter-2 and β represents the fraction of load power supplied by grid....
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TL;DR: A unified energy management scheme is proposed for renewable grid integrated systems with battery-supercapacitor hybrid storage that enables the real power transfer along with ancillary services such as current harmonic mitigation, reactive power support, and power factor improvement at the point of common coupling.
Abstract: In this paper, a unified energy management scheme is proposed for renewable grid integrated systems with battery–supercapacitor hybrid storage. The intermittent nature of renewable-energy resources (RES), coupled with the unpredictable changes in the load, demands high-power and high-energy-density storage systems to coexist in today's microgrid environment. The proposed scheme dynamically changes the modes of renewable integrated systems based on the availability of RES power and changes in load as well. The participation of battery–supercapacitor storage to handle sudden/average changes in power surges results in fast dc link voltage regulation, effective energy management, and reduced current stress on battery. In addition, the proposed energy management scheme enables the real power transfer along with ancillary services such as current harmonic mitigation, reactive power support, and power factor improvement at the point of common coupling. The proposed scheme is validated through both simulation and experimental studies.
264 citations
"Power management of grid connected ..." refers background in this paper
...However the use of grid tied inverters for high power applications is limited by the current rating of semiconductor devices used....
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TL;DR: In this article, a control strategy for proper load sharing between parallel converters connected in a microgrid and supplied by distributed generators is proposed to improve the power quality and proper share in both islanded and grid-connected modes.
Abstract: Control methods for proper load sharing between parallel converters connected in a microgrid and supplied by distributed generators (DGs) are described. It is assumed that the microgrid spans a large area and it supplies loads in both in grid-connected and islanded modes. A control strategy is proposed to improve power quality and proper load sharing in both islanded and grid-connected modes. It is assumed that each of the DGs has a local load connected to it which can be unbalanced and/or non-linear. The DGs compensate the effects of unbalance and non-linearity of the local loads. Common loads are also connected to the microgrid, which are supplied by the utility grid under normal conditions. However, during islanding, each of the DGs supplies its local load and shares the common load through droop characteristics. Both impedance and motor loads are considered to verify the system response. The efficacy of the controller has been validated through simulation for various operating conditions using PSCAD. It has been found through simulation that the total harmonic distortion (THD) of the microgrid voltage is ~10~ and the negative and zero sequence components are ~20~ of the positive sequence component before compensation. After compensation, the THD remains ~0.5~, whereas negative and zero sequence components of the voltages remain ~0.02~ of the positive sequence component.
208 citations
"Power management of grid connected ..." refers background or methods in this paper
...In this work a pair of inverters i.e. DVSI along with DC microgrid system is considered....
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...Moreover, industrial automation is very sophisticated now a days, which requires clean power....
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