A Study on Emulated Inertia Control of Grid-Connected Inverter-Based Power Supply Sources for Mass Integration of Renewable Energy Resources
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This study clarified the important elements of emulated inertia control for grid-connected inverter-based power supply sources and identified the issues to be addressed for its integration into the system. A classification framework was constructed and the emulated inertia control algorithms were classified into four types. Next, a simulation study was performed on five emulated inertia control algorithms in order to compare their effectiveness in suppressing frequency fluctuations. An emulated inertia control algorithm based on the voltage-controlled method and one based on the current-controlled method were selected from each classification type. Selected emulated inertia control algorithms were implemented on the experimental hardware of a 5 kVA inverter-based power supply, after which an experimental test was performed.Abstract When simulating quasi-static inter-compartment flow it is currently accepted practice to include fluid inertia effects in the compartments by extending the flow path beyond its geometrical limits. Such an extension simulates inertia by effectively adding mass to the flow path that the pressure differential between the compartments must overcome. In this paper, the effects of flow inertia are investigated by comparing results for two connected compartments using a quasi-static flow approximation that neglects inertia with results from a method of characteristics program that does include inertia. Comparison of simulations employing these methodologies can be used to assess the influence of inertia during inter-compartment flow.
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Even though a company is willing to adopt an information system, there is often some organizational inertia associated with the adoption process. In this paper, we explore the types of inertia in IS adoption in the context of a specific business process. Drawing on seven case studies where inertia can be observed, we illustrate the inertia types found in earlier research and find indication for the existence of two new types of inertia: externality inertia and mimetic inertia.
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Nowadays, inverter-based resources (IBRs) are rapidly growing in electric power systems. On the other side, abnormal inverter operations are also occurring more often. Traditionally, inverter P-Q capability charts are employed by electric utility companies to ensure safe and reliable operations of IBRs. However, it is found in this article that existing inverter P-Q capability charts do not address the operating characteristics of an inverter correctly, which can result in irregular and unstable inverter operations. In this article, a novel study is conducted to investigate inverter P-Q capability charts, where constraints that are specific to an inverter are considered. It is found in this article that the inverter P-Q capability charts exhibit a unique dynamic nature under uncertain grid conditions. This dynamic nature has not been considered by the industry in managing, designing, and controlling an inverter as well as in developing international standards for IBRs. Via both electromagnetic transient (EMT) simulation and hardware experimental investigations, it is found that the dynamic P-Q capability nature, together with the limitations of the existing control methods, is the underlying causes of many unusual inverter operations that have been reported in the literature.
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Using general-purpose inverter to control load of fan,pump can save energy effectively.When the general-purpose inverter is prepared for the existing motor,it is necessary to select the types of inverter according to the actual situation firstly,then it is important to calculate the rated value of inverter accurately,to achieve the best cost performance.The basic principle of selecting inverter shall be that the total current of load with continuous running does not exceed the inverter's rated current.
Grid-tie inverter
Value (mathematics)
Electronic speed control
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Moment of inertia
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Abstract This paper presents a nine‐switch inverter that can drive two AC motors independently. Recently, as an inverter that can drive them independently, a five‐leg inverter has been proposed. Ten switching devices are used for the five‐leg inverter, whereas only nine are used for the nine‐switch inverter. So, the nine‐switch inverter has the merit that one switching device can be reduced compared to the five‐leg inverter. Moreover, the maximum output voltage of the nine‐switch inverter equals that of the five‐leg inverter. In this work, we propose the structure of the nine‐switch inverter and a modulation method for the same, and validate the nine‐switch inverter by showing simulation results. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Grid-tie inverter
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An elastohydrodynamic lubrication model is presented for the coupled problem of a hydrodynamic lubricating fluid in an elastic structure that includes distributed structural inertia. The problem is formulated and the governing equations solved with the finite element method for an illustrative journal bearing subject to dynamic loading. Inertia effects are demonstrated through comparisons with an existing quasi-static model. While it is true that structural inertia can be neglected without significant loss of accuracy for many journal bearing applications, the new model presented does capture effects of distributed structural inertia where such effects are important and exhibits improvements over existing methods with respect to numerical stability.
Structural Stability
Fluid bearing
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This paper proposes a novel inverter named nine-switch inverter. The inverter has nine switching devices and can control two loads. First, the configuration of the inverter is introduced. Then, a PWM method for the inverter is elaborated. The validity of the inverter is verified by simulations and experiments. In addition, this paper proposes a 3N + 3-switch inverter, which is an extension of the nine-switch inverter. This inverter has 3N + 3 switches and can control N loads independently. The validity of the 3N + 3-switch inverter is also verified by simulations.
Grid-tie inverter
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