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The aim of this paper is to explain a novel technique to improve voltage and frequency profiles on microgrids controlled using the droop control scheme. The method consists on retuning the controller according to the present load scenario by adjusting the droop coefficients in a way that is proportional to the load changes. The proposed technique is tested through numerical simulations and the results...
One solution towards a resilient electric distribution system during extreme weather conditions and other natural disasters is microgrid with distribution automation. This low voltage bottom-up black start capability and feeder reconfiguration capability allow true realization of the full potentialities of distributed generation. This paper exploits the black start of a low voltage network supported...
In this paper, a modified droop control combined with power-line signaling is applied to several public dc street/road lighting microgrids with microgeneration and storage capability. The idea is to communicate low-level microgrid's main converter with the battery management system (BMS) injecting a high-frequency signal into the dc bus. Depending on the value of this frequency, the batteries will...
The distributed generation units are connected to microgrid through an interfacing inverter. Interfaced inverter plays main role in the operating performance of microgrid. In this paper, interfaced parallel inverter control using an P-F/Q-V droop control was investigated, when microgrid operated in islanded mode. In islanding mode the inverter droop control should maintain voltage and frequency stability...
When a greatly varying load is connected to a weak system, stability of the system becomes a problem. In these days, because the use of renewable energy is accelerating, not only the loads but also the distributed power sources can be critical factors in destabilizing the system. The virtual synchronous generator (VSG) control allows a static inverter to behave similar to a synchronous generator (SG)...
This paper develops selective strategies for Neutral Point Clamped Multilevel Inverter (NPC) in a microgrid application with load current decomposition based on Synchronous Reference Frame (DQ) method. The 3-level NPC inverter is investigated as widely used topology for medium and high power applications. In addition to the current injection into the grid, the 3-level NPC DG inverter is also being...
By constructing a small-scale microgrid, we have examined a control and operation method for the efficient use of distributed power generation. Thus far, the high-efficiency operation of distributed power introduced into grid has not been achieved. In this study, a method that operates a microgrid by predicting the PV output and electric power demand is proposed. Then, the effectiveness of this method...
Whilst distributed generation, particularly in the form of solar photovoltaics, is appearing as one of the key components of future power systems, it brings many challenges. Challenges such as intermittent generation supply, fault detection, anti-islanding operation and voltage control have received a great deal of research and practical attention. One practical challenge that hasn't been examined...
In multi-inverter-based islanded microgrids with unbalanced and distorted loads, due to voltage drop across line, the load bus voltage is unbalanced and distorted, which shows the requirement for power quality increase at load bus. To address this problem, this paper presents master-slave-based cooperative operation of DGs with the implementation of Conservative Power Theory (CPT), in which in addition...
Distributed energy resources (DERs) powered by natural gas engines are becoming more popular in several nations. This paper presents the modeling and analysis of engine fuel map limits on natural gas powered DERs installed at the CERTS Microgrid. A physics-based approach is used for correct modeling of the limiting conditions in DERs. The distinguishing characteristics of both inverter-based and synchronous...
This Paper presents report of pilot project of Islanded Micro-Grid (IMG) at NIMS University, Jaipur (India), a part of NIMS “Green Energy Initiative” program for Rural Energy System. The main aim of the program is to bring rural India from darkness to delighted India. A 75 m long Island Micro-Grid (IMG) line is laid and interface with “Standard Comparing Power Source” (SCPS). Renewable distributed...
This paper presents a coordinated control method for inverter based distributed generators operating in low voltage microgrids. Power flow output for each generator is adjusted using a local controller optimally tuned for operation in low voltage distribution lines. The output active and reactive power set points for each controller is adjusted through a communication network. The real time simultaneous...
Often, there are several inverter interfaced distributed generations (IIDGs) in a Microgrid (MG). Each IIDG is connected to local loads and other IIDGs by one or several line. In this paper, an adaptive droop control method is presented that uses from line parameters between generation and consumption. Particle Swarm Optimization (PSO) is used to estimate optimal virtual line parameters. The impacts...
The purpose of this paper is to relate the issues which have an impact on the interconnection of distributed resources to the utility grid. Impact that can be clearly seen is with respect to the types of distributed resources and the power electronic (PE) devices used to interface them. A balance has to be maintained between the type of DER's and the interfaces in order to get the maximum benefit...
Paralleling converters is normally employed to increase power capacity in different applications, such as autonomous micro grid systems and unininterruptible power supplies. These systems share the current between the different converters, but it must be in an equalized manner, no matter different type of loads or conditions. This paper propose an alternative to operate parallel inverters, the proposal...
This paper focuses on the islanded operation of microgrids. In this mode of operation, the microsources are required to cooperate autonomously to regulate the local grid voltage and frequency. Droop control is typically used to achieve this autonomous voltage and frequency regulation. However, droop control has real and reactive power sharing limitations between the microsource inverters when there...
In this paper, a dual-loop control scheme is proposed for inverters in three-phase four-wire microgrid applications to improve the power quality within the microgrid and the power quality of the current flowing between the microgrid and the utility grid. The control scheme involves an inner voltage loop and an outer current loop, with both controllers designed using the H∞ repetitive strategy. This...
As an important component of distribution network, micro-grid is the necessarily development trend for future. Micro-grid has greatly improved the random problems of distributed generation (DG). However, DGs, the power electronic equipments inevitably bring about power quality problems, especially voltage flicker and harmonics. This paper tries to study the operating regulations of micro-grid in order...
This paper studies the transient stability of the micro-grid supplied by multiple distributed generations, which are interfaced by synchronous generator and inverters. The study is performed by DIgSILENT Power Factory 14.0 and the IEEE 37-node distribution system is used for simulations. The three-phase-to-ground short-circuit fault is applied when doing the following work. The transient behaviors...
The emergence of large amounts of distributed energy resources (DER) poses new challenges for the active participation of those units in the control of the grid. In this context, a recent development is the microgrid, which presents a coordinated approach for integrating the DER in the electrical grid. Microgrids are able to operate either connected to the distribution grid or in islanded mode. In...
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